aboutsummaryrefslogtreecommitdiff
path: root/gdb/utils.c
blob: fed2e7e25ad73119c48bfbf0b18f1c8bd3cd7643 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
/* General utility routines for GDB, the GNU debugger.

   Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
   1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
   Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "gdb_assert.h"
#include <ctype.h>
#include "gdb_string.h"
#include "event-top.h"
#include "exceptions.h"
#include "gdbthread.h"

#ifdef TUI
#include "tui/tui.h"		/* For tui_get_command_dimension.   */
#endif

#ifdef __GO32__
#include <pc.h>
#endif

/* SunOS's curses.h has a '#define reg register' in it.  Thank you Sun. */
#ifdef reg
#undef reg
#endif

#include <signal.h>
#include "gdbcmd.h"
#include "serial.h"
#include "bfd.h"
#include "target.h"
#include "demangle.h"
#include "expression.h"
#include "language.h"
#include "charset.h"
#include "annotate.h"
#include "filenames.h"
#include "symfile.h"
#include "gdb_obstack.h"
#include "gdbcore.h"
#include "top.h"

#include "inferior.h"		/* for signed_pointer_to_address */

#include <sys/param.h>		/* For MAXPATHLEN */

#include "gdb_curses.h"

#include "readline/readline.h"

#include <sys/time.h>
#include <time.h>

#if !HAVE_DECL_MALLOC
extern PTR malloc ();		/* OK: PTR */
#endif
#if !HAVE_DECL_REALLOC
extern PTR realloc ();		/* OK: PTR */
#endif
#if !HAVE_DECL_FREE
extern void free ();
#endif

/* readline defines this.  */
#undef savestring

void (*deprecated_error_begin_hook) (void);

/* Prototypes for local functions */

static void vfprintf_maybe_filtered (struct ui_file *, const char *,
				     va_list, int) ATTR_FORMAT (printf, 2, 0);

static void fputs_maybe_filtered (const char *, struct ui_file *, int);

static void do_my_cleanups (struct cleanup **, struct cleanup *);

static void prompt_for_continue (void);

static void set_screen_size (void);
static void set_width (void);

/* A flag indicating whether to timestamp debugging messages.  */

static int debug_timestamp = 0;

/* Chain of cleanup actions established with make_cleanup,
   to be executed if an error happens.  */

static struct cleanup *cleanup_chain;	/* cleaned up after a failed command */
static struct cleanup *final_cleanup_chain;	/* cleaned up when gdb exits */

/* Nonzero if we have job control. */

int job_control;

/* Nonzero means a quit has been requested.  */

int quit_flag;

/* Nonzero means quit immediately if Control-C is typed now, rather
   than waiting until QUIT is executed.  Be careful in setting this;
   code which executes with immediate_quit set has to be very careful
   about being able to deal with being interrupted at any time.  It is
   almost always better to use QUIT; the only exception I can think of
   is being able to quit out of a system call (using EINTR loses if
   the SIGINT happens between the previous QUIT and the system call).
   To immediately quit in the case in which a SIGINT happens between
   the previous QUIT and setting immediate_quit (desirable anytime we
   expect to block), call QUIT after setting immediate_quit.  */

int immediate_quit;

/* Nonzero means that encoded C++/ObjC names should be printed out in their
   C++/ObjC form rather than raw.  */

int demangle = 1;
static void
show_demangle (struct ui_file *file, int from_tty,
	       struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("\
Demangling of encoded C++/ObjC names when displaying symbols is %s.\n"),
		    value);
}

/* Nonzero means that encoded C++/ObjC names should be printed out in their
   C++/ObjC form even in assembler language displays.  If this is set, but
   DEMANGLE is zero, names are printed raw, i.e. DEMANGLE controls.  */

int asm_demangle = 0;
static void
show_asm_demangle (struct ui_file *file, int from_tty,
		   struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("\
Demangling of C++/ObjC names in disassembly listings is %s.\n"),
		    value);
}

/* Nonzero means that strings with character values >0x7F should be printed
   as octal escapes.  Zero means just print the value (e.g. it's an
   international character, and the terminal or window can cope.)  */

int sevenbit_strings = 0;
static void
show_sevenbit_strings (struct ui_file *file, int from_tty,
		       struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("\
Printing of 8-bit characters in strings as \\nnn is %s.\n"),
		    value);
}

/* String to be printed before error messages, if any.  */

char *error_pre_print;

/* String to be printed before quit messages, if any.  */

char *quit_pre_print;

/* String to be printed before warning messages, if any.  */

char *warning_pre_print = "\nwarning: ";

int pagination_enabled = 1;
static void
show_pagination_enabled (struct ui_file *file, int from_tty,
			 struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("State of pagination is %s.\n"), value);
}



/* Add a new cleanup to the cleanup_chain,
   and return the previous chain pointer
   to be passed later to do_cleanups or discard_cleanups.
   Args are FUNCTION to clean up with, and ARG to pass to it.  */

struct cleanup *
make_cleanup (make_cleanup_ftype *function, void *arg)
{
  return make_my_cleanup (&cleanup_chain, function, arg);
}

struct cleanup *
make_cleanup_dtor (make_cleanup_ftype *function, void *arg,
		   void (*dtor) (void *))
{
  return make_my_cleanup2 (&cleanup_chain,
			   function, arg, dtor);
}

struct cleanup *
make_final_cleanup (make_cleanup_ftype *function, void *arg)
{
  return make_my_cleanup (&final_cleanup_chain, function, arg);
}

static void
do_freeargv (void *arg)
{
  freeargv ((char **) arg);
}

struct cleanup *
make_cleanup_freeargv (char **arg)
{
  return make_my_cleanup (&cleanup_chain, do_freeargv, arg);
}

static void
do_bfd_close_cleanup (void *arg)
{
  bfd_close (arg);
}

struct cleanup *
make_cleanup_bfd_close (bfd *abfd)
{
  return make_cleanup (do_bfd_close_cleanup, abfd);
}

static void
do_close_cleanup (void *arg)
{
  int *fd = arg;
  close (*fd);
}

struct cleanup *
make_cleanup_close (int fd)
{
  int *saved_fd = xmalloc (sizeof (fd));
  *saved_fd = fd;
  return make_cleanup_dtor (do_close_cleanup, saved_fd, xfree);
}

/* Helper function which does the work for make_cleanup_fclose.  */

static void
do_fclose_cleanup (void *arg)
{
  FILE *file = arg;
  fclose (arg);
}

/* Return a new cleanup that closes FILE.  */

struct cleanup *
make_cleanup_fclose (FILE *file)
{
  return make_cleanup (do_fclose_cleanup, file);
}

static void
do_ui_file_delete (void *arg)
{
  ui_file_delete (arg);
}

struct cleanup *
make_cleanup_ui_file_delete (struct ui_file *arg)
{
  return make_my_cleanup (&cleanup_chain, do_ui_file_delete, arg);
}

static void
do_free_section_addr_info (void *arg)
{
  free_section_addr_info (arg);
}

struct cleanup *
make_cleanup_free_section_addr_info (struct section_addr_info *addrs)
{
  return make_my_cleanup (&cleanup_chain, do_free_section_addr_info, addrs);
}

struct restore_integer_closure
{
  int *variable;
  int value;
};

static void
restore_integer (void *p)
{
  struct restore_integer_closure *closure = p;
  *(closure->variable) = closure->value;
}

/* Remember the current value of *VARIABLE and make it restored when the cleanup
   is run.  */
struct cleanup *
make_cleanup_restore_integer (int *variable)
{
  struct restore_integer_closure *c =
    xmalloc (sizeof (struct restore_integer_closure));
  c->variable = variable;
  c->value = *variable;

  return make_my_cleanup2 (&cleanup_chain, restore_integer, (void *)c,
			   xfree);
}

struct cleanup *
make_my_cleanup2 (struct cleanup **pmy_chain, make_cleanup_ftype *function,
		  void *arg,  void (*free_arg) (void *))
{
  struct cleanup *new
    = (struct cleanup *) xmalloc (sizeof (struct cleanup));
  struct cleanup *old_chain = *pmy_chain;

  new->next = *pmy_chain;
  new->function = function;
  new->free_arg = free_arg;
  new->arg = arg;
  *pmy_chain = new;

  return old_chain;
}

struct cleanup *
make_my_cleanup (struct cleanup **pmy_chain, make_cleanup_ftype *function,
		 void *arg)
{
  return make_my_cleanup2 (pmy_chain, function, arg, NULL);
}

/* Discard cleanups and do the actions they describe
   until we get back to the point OLD_CHAIN in the cleanup_chain.  */

void
do_cleanups (struct cleanup *old_chain)
{
  do_my_cleanups (&cleanup_chain, old_chain);
}

void
do_final_cleanups (struct cleanup *old_chain)
{
  do_my_cleanups (&final_cleanup_chain, old_chain);
}

static void
do_my_cleanups (struct cleanup **pmy_chain,
		struct cleanup *old_chain)
{
  struct cleanup *ptr;
  while ((ptr = *pmy_chain) != old_chain)
    {
      *pmy_chain = ptr->next;	/* Do this first incase recursion */
      (*ptr->function) (ptr->arg);
      if (ptr->free_arg)
	(*ptr->free_arg) (ptr->arg);
      xfree (ptr);
    }
}

/* Discard cleanups, not doing the actions they describe,
   until we get back to the point OLD_CHAIN in the cleanup_chain.  */

void
discard_cleanups (struct cleanup *old_chain)
{
  discard_my_cleanups (&cleanup_chain, old_chain);
}

void
discard_final_cleanups (struct cleanup *old_chain)
{
  discard_my_cleanups (&final_cleanup_chain, old_chain);
}

void
discard_my_cleanups (struct cleanup **pmy_chain,
		     struct cleanup *old_chain)
{
  struct cleanup *ptr;
  while ((ptr = *pmy_chain) != old_chain)
    {
      *pmy_chain = ptr->next;
      if (ptr->free_arg)
	(*ptr->free_arg) (ptr->arg);
      xfree (ptr);
    }
}

/* Set the cleanup_chain to 0, and return the old cleanup chain.  */
struct cleanup *
save_cleanups (void)
{
  return save_my_cleanups (&cleanup_chain);
}

struct cleanup *
save_final_cleanups (void)
{
  return save_my_cleanups (&final_cleanup_chain);
}

struct cleanup *
save_my_cleanups (struct cleanup **pmy_chain)
{
  struct cleanup *old_chain = *pmy_chain;

  *pmy_chain = 0;
  return old_chain;
}

/* Restore the cleanup chain from a previously saved chain.  */
void
restore_cleanups (struct cleanup *chain)
{
  restore_my_cleanups (&cleanup_chain, chain);
}

void
restore_final_cleanups (struct cleanup *chain)
{
  restore_my_cleanups (&final_cleanup_chain, chain);
}

void
restore_my_cleanups (struct cleanup **pmy_chain, struct cleanup *chain)
{
  *pmy_chain = chain;
}

/* This function is useful for cleanups.
   Do

   foo = xmalloc (...);
   old_chain = make_cleanup (free_current_contents, &foo);

   to arrange to free the object thus allocated.  */

void
free_current_contents (void *ptr)
{
  void **location = ptr;
  if (location == NULL)
    internal_error (__FILE__, __LINE__,
		    _("free_current_contents: NULL pointer"));
  if (*location != NULL)
    {
      xfree (*location);
      *location = NULL;
    }
}

/* Provide a known function that does nothing, to use as a base for
   for a possibly long chain of cleanups.  This is useful where we
   use the cleanup chain for handling normal cleanups as well as dealing
   with cleanups that need to be done as a result of a call to error().
   In such cases, we may not be certain where the first cleanup is, unless
   we have a do-nothing one to always use as the base. */

void
null_cleanup (void *arg)
{
}

/* Continuations are implemented as cleanups internally.  Inherit from
   cleanups.  */
struct continuation
{
  struct cleanup base;
};

/* Add a continuation to the continuation list of THREAD.  The new
   continuation will be added at the front.  */
void
add_continuation (struct thread_info *thread,
		  void (*continuation_hook) (void *), void *args,
		  void (*continuation_free_args) (void *))
{
  struct cleanup *as_cleanup = &thread->continuations->base;
  make_cleanup_ftype *continuation_hook_fn = continuation_hook;

  make_my_cleanup2 (&as_cleanup,
		    continuation_hook_fn,
		    args,
		    continuation_free_args);

  thread->continuations = (struct continuation *) as_cleanup;
}

/* Add a continuation to the continuation list of INFERIOR.  The new
   continuation will be added at the front.  */

void
add_inferior_continuation (void (*continuation_hook) (void *), void *args,
			   void (*continuation_free_args) (void *))
{
  struct inferior *inf = current_inferior ();
  struct cleanup *as_cleanup = &inf->continuations->base;
  make_cleanup_ftype *continuation_hook_fn = continuation_hook;

  make_my_cleanup2 (&as_cleanup,
		    continuation_hook_fn,
		    args,
		    continuation_free_args);

  inf->continuations = (struct continuation *) as_cleanup;
}

/* Do all continuations of the current inferior.  */

void
do_all_inferior_continuations (void)
{
  struct cleanup *old_chain;
  struct cleanup *as_cleanup;
  struct inferior *inf = current_inferior ();

  if (inf->continuations == NULL)
    return;

  /* Copy the list header into another pointer, and set the global
     list header to null, so that the global list can change as a side
     effect of invoking the continuations and the processing of the
     preexisting continuations will not be affected.  */

  as_cleanup = &inf->continuations->base;
  inf->continuations = NULL;

  /* Work now on the list we have set aside.  */
  do_my_cleanups (&as_cleanup, NULL);
}

/* Get rid of all the inferior-wide continuations of INF.  */

void
discard_all_inferior_continuations (struct inferior *inf)
{
  struct cleanup *continuation_ptr = &inf->continuations->base;
  discard_my_cleanups (&continuation_ptr, NULL);
  inf->continuations = NULL;
}

static void
restore_thread_cleanup (void *arg)
{
  ptid_t *ptid_p = arg;
  switch_to_thread (*ptid_p);
}

/* Walk down the continuation list of PTID, and execute all the
   continuations.  There is a problem though.  In some cases new
   continuations may be added while we are in the middle of this loop.
   If this happens they will be added in the front, and done before we
   have a chance of exhausting those that were already there.  We need
   to then save the beginning of the list in a pointer and do the
   continuations from there on, instead of using the global beginning
   of list as our iteration pointer.  */
static void
do_all_continuations_ptid (ptid_t ptid,
			   struct continuation **continuations_p)
{
  struct cleanup *old_chain;
  ptid_t current_thread;
  struct cleanup *as_cleanup;

  if (*continuations_p == NULL)
    return;

  current_thread = inferior_ptid;

  /* Restore selected thread on exit.  Don't try to restore the frame
     as well, because:

    - When running continuations, the selected frame is always #0.

    - The continuations may trigger symbol file loads, which may
      change the frame layout (frame ids change), which would trigger
      a warning if we used make_cleanup_restore_current_thread.  */

  old_chain = make_cleanup (restore_thread_cleanup, &current_thread);

  /* Let the continuation see this thread as selected.  */
  switch_to_thread (ptid);

  /* Copy the list header into another pointer, and set the global
     list header to null, so that the global list can change as a side
     effect of invoking the continuations and the processing of the
     preexisting continuations will not be affected.  */

  as_cleanup = &(*continuations_p)->base;
  *continuations_p = NULL;

  /* Work now on the list we have set aside.  */
  do_my_cleanups (&as_cleanup, NULL);

  do_cleanups (old_chain);
}

/* Callback for iterate over threads.  */
static int
do_all_continuations_thread_callback (struct thread_info *thread, void *data)
{
  do_all_continuations_ptid (thread->ptid, &thread->continuations);
  return 0;
}

/* Do all continuations of thread THREAD.  */
void
do_all_continuations_thread (struct thread_info *thread)
{
  do_all_continuations_thread_callback (thread, NULL);
}

/* Do all continuations of all threads.  */
void
do_all_continuations (void)
{
  iterate_over_threads (do_all_continuations_thread_callback, NULL);
}

/* Callback for iterate over threads.  */
static int
discard_all_continuations_thread_callback (struct thread_info *thread,
					   void *data)
{
  struct cleanup *continuation_ptr = &thread->continuations->base;
  discard_my_cleanups (&continuation_ptr, NULL);
  thread->continuations = NULL;
  return 0;
}

/* Get rid of all the continuations of THREAD.  */
void
discard_all_continuations_thread (struct thread_info *thread)
{
  discard_all_continuations_thread_callback (thread, NULL);
}

/* Get rid of all the continuations of all threads.  */
void
discard_all_continuations (void)
{
  iterate_over_threads (discard_all_continuations_thread_callback, NULL);
}


/* Add a continuation to the intermediate continuation list of THREAD.
   The new continuation will be added at the front.  */
void
add_intermediate_continuation (struct thread_info *thread,
			       void (*continuation_hook)
			       (void *), void *args,
			       void (*continuation_free_args) (void *))
{
  struct cleanup *as_cleanup = &thread->intermediate_continuations->base;
  make_cleanup_ftype *continuation_hook_fn = continuation_hook;

  make_my_cleanup2 (&as_cleanup,
		    continuation_hook_fn,
		    args,
		    continuation_free_args);

  thread->intermediate_continuations = (struct continuation *) as_cleanup;
}

/* Walk down the cmd_continuation list, and execute all the
   continuations. There is a problem though. In some cases new
   continuations may be added while we are in the middle of this
   loop. If this happens they will be added in the front, and done
   before we have a chance of exhausting those that were already
   there. We need to then save the beginning of the list in a pointer
   and do the continuations from there on, instead of using the
   global beginning of list as our iteration pointer.*/
static int
do_all_intermediate_continuations_thread_callback (struct thread_info *thread,
						   void *data)
{
  do_all_continuations_ptid (thread->ptid,
			     &thread->intermediate_continuations);
  return 0;
}

/* Do all intermediate continuations of thread THREAD.  */
void
do_all_intermediate_continuations_thread (struct thread_info *thread)
{
  do_all_intermediate_continuations_thread_callback (thread, NULL);
}

/* Do all intermediate continuations of all threads.  */
void
do_all_intermediate_continuations (void)
{
  iterate_over_threads (do_all_intermediate_continuations_thread_callback, NULL);
}

/* Callback for iterate over threads.  */
static int
discard_all_intermediate_continuations_thread_callback (struct thread_info *thread,
							void *data)
{
  struct cleanup *continuation_ptr = &thread->intermediate_continuations->base;
  discard_my_cleanups (&continuation_ptr, NULL);
  thread->intermediate_continuations = NULL;
  return 0;
}

/* Get rid of all the intermediate continuations of THREAD.  */
void
discard_all_intermediate_continuations_thread (struct thread_info *thread)
{
  discard_all_intermediate_continuations_thread_callback (thread, NULL);
}

/* Get rid of all the intermediate continuations of all threads.  */
void
discard_all_intermediate_continuations (void)
{
  iterate_over_threads (discard_all_intermediate_continuations_thread_callback, NULL);
}



/* Print a warning message.  The first argument STRING is the warning
   message, used as an fprintf format string, the second is the
   va_list of arguments for that string.  A warning is unfiltered (not
   paginated) so that the user does not need to page through each
   screen full of warnings when there are lots of them.  */

void
vwarning (const char *string, va_list args)
{
  if (deprecated_warning_hook)
    (*deprecated_warning_hook) (string, args);
  else
    {
      target_terminal_ours ();
      wrap_here ("");		/* Force out any buffered output */
      gdb_flush (gdb_stdout);
      if (warning_pre_print)
	fputs_unfiltered (warning_pre_print, gdb_stderr);
      vfprintf_unfiltered (gdb_stderr, string, args);
      fprintf_unfiltered (gdb_stderr, "\n");
      va_end (args);
    }
}

/* Print a warning message.
   The first argument STRING is the warning message, used as a fprintf string,
   and the remaining args are passed as arguments to it.
   The primary difference between warnings and errors is that a warning
   does not force the return to command level.  */

void
warning (const char *string, ...)
{
  va_list args;
  va_start (args, string);
  vwarning (string, args);
  va_end (args);
}

/* Print an error message and return to command level.
   The first argument STRING is the error message, used as a fprintf string,
   and the remaining args are passed as arguments to it.  */

NORETURN void
verror (const char *string, va_list args)
{
  throw_verror (GENERIC_ERROR, string, args);
}

NORETURN void
error (const char *string, ...)
{
  va_list args;
  va_start (args, string);
  throw_verror (GENERIC_ERROR, string, args);
  va_end (args);
}

/* Print an error message and quit.
   The first argument STRING is the error message, used as a fprintf string,
   and the remaining args are passed as arguments to it.  */

NORETURN void
vfatal (const char *string, va_list args)
{
  throw_vfatal (string, args);
}

NORETURN void
fatal (const char *string, ...)
{
  va_list args;
  va_start (args, string);
  throw_vfatal (string, args);
  va_end (args);
}

NORETURN void
error_stream (struct ui_file *stream)
{
  long len;
  char *message = ui_file_xstrdup (stream, &len);
  make_cleanup (xfree, message);
  error (("%s"), message);
}

/* Print a message reporting an internal error/warning. Ask the user
   if they want to continue, dump core, or just exit.  Return
   something to indicate a quit.  */

struct internal_problem
{
  const char *name;
  /* FIXME: cagney/2002-08-15: There should be ``maint set/show''
     commands available for controlling these variables.  */
  enum auto_boolean should_quit;
  enum auto_boolean should_dump_core;
};

/* Report a problem, internal to GDB, to the user.  Once the problem
   has been reported, and assuming GDB didn't quit, the caller can
   either allow execution to resume or throw an error.  */

static void ATTR_FORMAT (printf, 4, 0)
internal_vproblem (struct internal_problem *problem,
		   const char *file, int line, const char *fmt, va_list ap)
{
  static int dejavu;
  int quit_p;
  int dump_core_p;
  char *reason;

  /* Don't allow infinite error/warning recursion.  */
  {
    static char msg[] = "Recursive internal problem.\n";
    switch (dejavu)
      {
      case 0:
	dejavu = 1;
	break;
      case 1:
	dejavu = 2;
	fputs_unfiltered (msg, gdb_stderr);
	abort ();	/* NOTE: GDB has only three calls to abort().  */
      default:
	dejavu = 3;
	write (STDERR_FILENO, msg, sizeof (msg));
	exit (1);
      }
  }

  /* Try to get the message out and at the start of a new line.  */
  target_terminal_ours ();
  begin_line ();

  /* Create a string containing the full error/warning message.  Need
     to call query with this full string, as otherwize the reason
     (error/warning) and question become separated.  Format using a
     style similar to a compiler error message.  Include extra detail
     so that the user knows that they are living on the edge.  */
  {
    char *msg;
    msg = xstrvprintf (fmt, ap);
    reason = xstrprintf ("\
%s:%d: %s: %s\n\
A problem internal to GDB has been detected,\n\
further debugging may prove unreliable.", file, line, problem->name, msg);
    xfree (msg);
    make_cleanup (xfree, reason);
  }

  switch (problem->should_quit)
    {
    case AUTO_BOOLEAN_AUTO:
      /* Default (yes/batch case) is to quit GDB.  When in batch mode
         this lessens the likelhood of GDB going into an infinate
         loop.  */
      quit_p = query (_("%s\nQuit this debugging session? "), reason);
      break;
    case AUTO_BOOLEAN_TRUE:
      quit_p = 1;
      break;
    case AUTO_BOOLEAN_FALSE:
      quit_p = 0;
      break;
    default:
      internal_error (__FILE__, __LINE__, _("bad switch"));
    }

  switch (problem->should_dump_core)
    {
    case AUTO_BOOLEAN_AUTO:
      /* Default (yes/batch case) is to dump core.  This leaves a GDB
         `dropping' so that it is easier to see that something went
         wrong in GDB.  */
      dump_core_p = query (_("%s\nCreate a core file of GDB? "), reason);
      break;
      break;
    case AUTO_BOOLEAN_TRUE:
      dump_core_p = 1;
      break;
    case AUTO_BOOLEAN_FALSE:
      dump_core_p = 0;
      break;
    default:
      internal_error (__FILE__, __LINE__, _("bad switch"));
    }

  if (quit_p)
    {
      if (dump_core_p)
	abort ();		/* NOTE: GDB has only three calls to abort().  */
      else
	exit (1);
    }
  else
    {
      if (dump_core_p)
	{
#ifdef HAVE_WORKING_FORK
	  if (fork () == 0)
	    abort ();		/* NOTE: GDB has only three calls to abort().  */
#endif
	}
    }

  dejavu = 0;
}

static struct internal_problem internal_error_problem = {
  "internal-error", AUTO_BOOLEAN_AUTO, AUTO_BOOLEAN_AUTO
};

NORETURN void
internal_verror (const char *file, int line, const char *fmt, va_list ap)
{
  internal_vproblem (&internal_error_problem, file, line, fmt, ap);
  deprecated_throw_reason (RETURN_ERROR);
}

NORETURN void
internal_error (const char *file, int line, const char *string, ...)
{
  va_list ap;
  va_start (ap, string);
  internal_verror (file, line, string, ap);
  va_end (ap);
}

static struct internal_problem internal_warning_problem = {
  "internal-warning", AUTO_BOOLEAN_AUTO, AUTO_BOOLEAN_AUTO
};

void
internal_vwarning (const char *file, int line, const char *fmt, va_list ap)
{
  internal_vproblem (&internal_warning_problem, file, line, fmt, ap);
}

void
internal_warning (const char *file, int line, const char *string, ...)
{
  va_list ap;
  va_start (ap, string);
  internal_vwarning (file, line, string, ap);
  va_end (ap);
}

/* Print the system error message for errno, and also mention STRING
   as the file name for which the error was encountered.
   Then return to command level.  */

NORETURN void
perror_with_name (const char *string)
{
  char *err;
  char *combined;

  err = safe_strerror (errno);
  combined = (char *) alloca (strlen (err) + strlen (string) + 3);
  strcpy (combined, string);
  strcat (combined, ": ");
  strcat (combined, err);

  /* I understand setting these is a matter of taste.  Still, some people
     may clear errno but not know about bfd_error.  Doing this here is not
     unreasonable. */
  bfd_set_error (bfd_error_no_error);
  errno = 0;

  error (_("%s."), combined);
}

/* Print the system error message for ERRCODE, and also mention STRING
   as the file name for which the error was encountered.  */

void
print_sys_errmsg (const char *string, int errcode)
{
  char *err;
  char *combined;

  err = safe_strerror (errcode);
  combined = (char *) alloca (strlen (err) + strlen (string) + 3);
  strcpy (combined, string);
  strcat (combined, ": ");
  strcat (combined, err);

  /* We want anything which was printed on stdout to come out first, before
     this message.  */
  gdb_flush (gdb_stdout);
  fprintf_unfiltered (gdb_stderr, "%s.\n", combined);
}

/* Control C eventually causes this to be called, at a convenient time.  */

void
quit (void)
{
#ifdef __MSDOS__
  /* No steenking SIGINT will ever be coming our way when the
     program is resumed.  Don't lie.  */
  fatal ("Quit");
#else
  if (job_control
      /* If there is no terminal switching for this target, then we can't
         possibly get screwed by the lack of job control.  */
      || current_target.to_terminal_ours == NULL)
    fatal ("Quit");
  else
    fatal ("Quit (expect signal SIGINT when the program is resumed)");
#endif
}


/* Called when a memory allocation fails, with the number of bytes of
   memory requested in SIZE. */

NORETURN void
nomem (long size)
{
  if (size > 0)
    {
      internal_error (__FILE__, __LINE__,
		      _("virtual memory exhausted: can't allocate %ld bytes."),
		      size);
    }
  else
    {
      internal_error (__FILE__, __LINE__, _("virtual memory exhausted."));
    }
}

/* The xmalloc() (libiberty.h) family of memory management routines.

   These are like the ISO-C malloc() family except that they implement
   consistent semantics and guard against typical memory management
   problems.  */

/* NOTE: These are declared using PTR to ensure consistency with
   "libiberty.h".  xfree() is GDB local.  */

PTR				/* OK: PTR */
xmalloc (size_t size)
{
  void *val;

  /* See libiberty/xmalloc.c.  This function need's to match that's
     semantics.  It never returns NULL.  */
  if (size == 0)
    size = 1;

  val = malloc (size);		/* OK: malloc */
  if (val == NULL)
    nomem (size);

  return (val);
}

void *
xzalloc (size_t size)
{
  return xcalloc (1, size);
}

PTR				/* OK: PTR */
xrealloc (PTR ptr, size_t size)	/* OK: PTR */
{
  void *val;

  /* See libiberty/xmalloc.c.  This function need's to match that's
     semantics.  It never returns NULL.  */
  if (size == 0)
    size = 1;

  if (ptr != NULL)
    val = realloc (ptr, size);	/* OK: realloc */
  else
    val = malloc (size);		/* OK: malloc */
  if (val == NULL)
    nomem (size);

  return (val);
}

PTR				/* OK: PTR */
xcalloc (size_t number, size_t size)
{
  void *mem;

  /* See libiberty/xmalloc.c.  This function need's to match that's
     semantics.  It never returns NULL.  */
  if (number == 0 || size == 0)
    {
      number = 1;
      size = 1;
    }

  mem = calloc (number, size);		/* OK: xcalloc */
  if (mem == NULL)
    nomem (number * size);

  return mem;
}

void
xfree (void *ptr)
{
  if (ptr != NULL)
    free (ptr);		/* OK: free */
}


/* Like asprintf/vasprintf but get an internal_error if the call
   fails. */

char *
xstrprintf (const char *format, ...)
{
  char *ret;
  va_list args;
  va_start (args, format);
  ret = xstrvprintf (format, args);
  va_end (args);
  return ret;
}

void
xasprintf (char **ret, const char *format, ...)
{
  va_list args;
  va_start (args, format);
  (*ret) = xstrvprintf (format, args);
  va_end (args);
}

void
xvasprintf (char **ret, const char *format, va_list ap)
{
  (*ret) = xstrvprintf (format, ap);
}

char *
xstrvprintf (const char *format, va_list ap)
{
  char *ret = NULL;
  int status = vasprintf (&ret, format, ap);
  /* NULL is returned when there was a memory allocation problem, or
     any other error (for instance, a bad format string).  A negative
     status (the printed length) with a non-NULL buffer should never
     happen, but just to be sure.  */
  if (ret == NULL || status < 0)
    internal_error (__FILE__, __LINE__, _("vasprintf call failed"));
  return ret;
}

int
xsnprintf (char *str, size_t size, const char *format, ...)
{
  va_list args;
  int ret;

  va_start (args, format);
  ret = vsnprintf (str, size, format, args);
  gdb_assert (ret < size);
  va_end (args);

  return ret;
}

/* My replacement for the read system call.
   Used like `read' but keeps going if `read' returns too soon.  */

int
myread (int desc, char *addr, int len)
{
  int val;
  int orglen = len;

  while (len > 0)
    {
      val = read (desc, addr, len);
      if (val < 0)
	return val;
      if (val == 0)
	return orglen - len;
      len -= val;
      addr += val;
    }
  return orglen;
}

/* Make a copy of the string at PTR with SIZE characters
   (and add a null character at the end in the copy).
   Uses malloc to get the space.  Returns the address of the copy.  */

char *
savestring (const char *ptr, size_t size)
{
  char *p = (char *) xmalloc (size + 1);
  memcpy (p, ptr, size);
  p[size] = 0;
  return p;
}

void
print_spaces (int n, struct ui_file *file)
{
  fputs_unfiltered (n_spaces (n), file);
}

/* Print a host address.  */

void
gdb_print_host_address (const void *addr, struct ui_file *stream)
{

  /* We could use the %p conversion specifier to fprintf if we had any
     way of knowing whether this host supports it.  But the following
     should work on the Alpha and on 32 bit machines.  */

  fprintf_filtered (stream, "0x%lx", (unsigned long) addr);
}


/* This function supports the query, nquery, and yquery functions.
   Ask user a y-or-n question and return 0 if answer is no, 1 if
   answer is yes, or default the answer to the specified default
   (for yquery or nquery).  DEFCHAR may be 'y' or 'n' to provide a
   default answer, or '\0' for no default.
   CTLSTR is the control string and should end in "? ".  It should
   not say how to answer, because we do that.
   ARGS are the arguments passed along with the CTLSTR argument to
   printf.  */

static int ATTR_FORMAT (printf, 1, 0)
defaulted_query (const char *ctlstr, const char defchar, va_list args)
{
  int answer;
  int ans2;
  int retval;
  int def_value;
  char def_answer, not_def_answer;
  char *y_string, *n_string, *question;

  /* Set up according to which answer is the default.  */
  if (defchar == '\0')
    {
      def_value = 1;
      def_answer = 'Y';
      not_def_answer = 'N';
      y_string = "y";
      n_string = "n";
    }
  else if (defchar == 'y')
    {
      def_value = 1;
      def_answer = 'Y';
      not_def_answer = 'N';
      y_string = "[y]";
      n_string = "n";
    }
  else
    {
      def_value = 0;
      def_answer = 'N';
      not_def_answer = 'Y';
      y_string = "y";
      n_string = "[n]";
    }

  /* Automatically answer the default value if the user did not want
     prompts.  */
  if (! caution)
    return def_value;

  /* If input isn't coming from the user directly, just say what
     question we're asking, and then answer "yes" automatically.  This
     way, important error messages don't get lost when talking to GDB
     over a pipe.  */
  if (! input_from_terminal_p ())
    {
      wrap_here ("");
      vfprintf_filtered (gdb_stdout, ctlstr, args);

      printf_filtered (_("(%s or %s) [answered %c; input not from terminal]\n"),
		       y_string, n_string, def_answer);
      gdb_flush (gdb_stdout);

      return def_value;
    }

  /* Automatically answer the default value if input is not from the user
     directly, or if the user did not want prompts.  */
  if (!input_from_terminal_p () || !caution)
    return def_value;

  if (deprecated_query_hook)
    {
      return deprecated_query_hook (ctlstr, args);
    }

  /* Format the question outside of the loop, to avoid reusing args.  */
  question = xstrvprintf (ctlstr, args);

  while (1)
    {
      wrap_here ("");		/* Flush any buffered output */
      gdb_flush (gdb_stdout);

      if (annotation_level > 1)
	printf_filtered (("\n\032\032pre-query\n"));

      fputs_filtered (question, gdb_stdout);
      printf_filtered (_("(%s or %s) "), y_string, n_string);

      if (annotation_level > 1)
	printf_filtered (("\n\032\032query\n"));

      wrap_here ("");
      gdb_flush (gdb_stdout);

      answer = fgetc (stdin);
      clearerr (stdin);		/* in case of C-d */
      if (answer == EOF)	/* C-d */
	{
	  printf_filtered ("EOF [assumed %c]\n", def_answer);
	  retval = def_value;
	  break;
	}
      /* Eat rest of input line, to EOF or newline */
      if (answer != '\n')
	do
	  {
	    ans2 = fgetc (stdin);
	    clearerr (stdin);
	  }
	while (ans2 != EOF && ans2 != '\n' && ans2 != '\r');

      if (answer >= 'a')
	answer -= 040;
      /* Check answer.  For the non-default, the user must specify
         the non-default explicitly.  */
      if (answer == not_def_answer)
	{
	  retval = !def_value;
	  break;
	}
      /* Otherwise, if a default was specified, the user may either
         specify the required input or have it default by entering
         nothing.  */
      if (answer == def_answer
	  || (defchar != '\0' &&
	      (answer == '\n' || answer == '\r' || answer == EOF)))
	{
	  retval = def_value;
	  break;
	}
      /* Invalid entries are not defaulted and require another selection.  */
      printf_filtered (_("Please answer %s or %s.\n"),
		       y_string, n_string);
    }

  xfree (question);
  if (annotation_level > 1)
    printf_filtered (("\n\032\032post-query\n"));
  return retval;
}


/* Ask user a y-or-n question and return 0 if answer is no, 1 if
   answer is yes, or 0 if answer is defaulted.
   Takes three args which are given to printf to print the question.
   The first, a control string, should end in "? ".
   It should not say how to answer, because we do that.  */

int
nquery (const char *ctlstr, ...)
{
  va_list args;

  va_start (args, ctlstr);
  return defaulted_query (ctlstr, 'n', args);
  va_end (args);
}

/* Ask user a y-or-n question and return 0 if answer is no, 1 if
   answer is yes, or 1 if answer is defaulted.
   Takes three args which are given to printf to print the question.
   The first, a control string, should end in "? ".
   It should not say how to answer, because we do that.  */

int
yquery (const char *ctlstr, ...)
{
  va_list args;

  va_start (args, ctlstr);
  return defaulted_query (ctlstr, 'y', args);
  va_end (args);
}

/* Ask user a y-or-n question and return 1 iff answer is yes.
   Takes three args which are given to printf to print the question.
   The first, a control string, should end in "? ".
   It should not say how to answer, because we do that.  */

int
query (const char *ctlstr, ...)
{
  va_list args;

  va_start (args, ctlstr);
  return defaulted_query (ctlstr, '\0', args);
  va_end (args);
}

/* Print an error message saying that we couldn't make sense of a
   \^mumble sequence in a string or character constant.  START and END
   indicate a substring of some larger string that contains the
   erroneous backslash sequence, missing the initial backslash.  */
static NORETURN int
no_control_char_error (const char *start, const char *end)
{
  int len = end - start;
  char *copy = alloca (end - start + 1);

  memcpy (copy, start, len);
  copy[len] = '\0';

  error (_("There is no control character `\\%s' in the `%s' character set."),
	 copy, target_charset ());
}

/* Parse a C escape sequence.  STRING_PTR points to a variable
   containing a pointer to the string to parse.  That pointer
   should point to the character after the \.  That pointer
   is updated past the characters we use.  The value of the
   escape sequence is returned.

   A negative value means the sequence \ newline was seen,
   which is supposed to be equivalent to nothing at all.

   If \ is followed by a null character, we return a negative
   value and leave the string pointer pointing at the null character.

   If \ is followed by 000, we return 0 and leave the string pointer
   after the zeros.  A value of 0 does not mean end of string.  */

int
parse_escape (char **string_ptr)
{
  int target_char;
  int c = *(*string_ptr)++;
  if (c_parse_backslash (c, &target_char))
    return target_char;
  else
    switch (c)
      {
      case '\n':
	return -2;
      case 0:
	(*string_ptr)--;
	return 0;
      case '^':
	{
	  /* Remember where this escape sequence started, for reporting
	     errors.  */
	  char *sequence_start_pos = *string_ptr - 1;

	  c = *(*string_ptr)++;

	  if (c == '?')
	    {
	      /* XXXCHARSET: What is `delete' in the host character set?  */
	      c = 0177;

	      if (!host_char_to_target (c, &target_char))
		error (_("There is no character corresponding to `Delete' "
		       "in the target character set `%s'."), host_charset ());

	      return target_char;
	    }
	  else if (c == '\\')
	    target_char = parse_escape (string_ptr);
	  else
	    {
	      if (!host_char_to_target (c, &target_char))
		no_control_char_error (sequence_start_pos, *string_ptr);
	    }

	  /* Now target_char is something like `c', and we want to find
	     its control-character equivalent.  */
	  if (!target_char_to_control_char (target_char, &target_char))
	    no_control_char_error (sequence_start_pos, *string_ptr);

	  return target_char;
	}

	/* XXXCHARSET: we need to use isdigit and value-of-digit
	   methods of the host character set here.  */

      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
	{
	  int i = c - '0';
	  int count = 0;
	  while (++count < 3)
	    {
	      c = (**string_ptr);
	      if (c >= '0' && c <= '7')
		{
		  (*string_ptr)++;
		  i *= 8;
		  i += c - '0';
		}
	      else
		{
		  break;
		}
	    }
	  return i;
	}
      default:
	if (!host_char_to_target (c, &target_char))
	  error
	    ("The escape sequence `\%c' is equivalent to plain `%c', which"
	     " has no equivalent\n" "in the `%s' character set.", c, c,
	     target_charset ());
	return target_char;
      }
}

/* Print the character C on STREAM as part of the contents of a literal
   string whose delimiter is QUOTER.  Note that this routine should only
   be call for printing things which are independent of the language
   of the program being debugged. */

static void
printchar (int c, void (*do_fputs) (const char *, struct ui_file *),
	   void (*do_fprintf) (struct ui_file *, const char *, ...)
	   ATTRIBUTE_FPTR_PRINTF_2, struct ui_file *stream, int quoter)
{

  c &= 0xFF;			/* Avoid sign bit follies */

  if (c < 0x20 ||		/* Low control chars */
      (c >= 0x7F && c < 0xA0) ||	/* DEL, High controls */
      (sevenbit_strings && c >= 0x80))
    {				/* high order bit set */
      switch (c)
	{
	case '\n':
	  do_fputs ("\\n", stream);
	  break;
	case '\b':
	  do_fputs ("\\b", stream);
	  break;
	case '\t':
	  do_fputs ("\\t", stream);
	  break;
	case '\f':
	  do_fputs ("\\f", stream);
	  break;
	case '\r':
	  do_fputs ("\\r", stream);
	  break;
	case '\033':
	  do_fputs ("\\e", stream);
	  break;
	case '\007':
	  do_fputs ("\\a", stream);
	  break;
	default:
	  do_fprintf (stream, "\\%.3o", (unsigned int) c);
	  break;
	}
    }
  else
    {
      if (c == '\\' || c == quoter)
	do_fputs ("\\", stream);
      do_fprintf (stream, "%c", c);
    }
}

/* Print the character C on STREAM as part of the contents of a
   literal string whose delimiter is QUOTER.  Note that these routines
   should only be call for printing things which are independent of
   the language of the program being debugged. */

void
fputstr_filtered (const char *str, int quoter, struct ui_file *stream)
{
  while (*str)
    printchar (*str++, fputs_filtered, fprintf_filtered, stream, quoter);
}

void
fputstr_unfiltered (const char *str, int quoter, struct ui_file *stream)
{
  while (*str)
    printchar (*str++, fputs_unfiltered, fprintf_unfiltered, stream, quoter);
}

void
fputstrn_filtered (const char *str, int n, int quoter,
		   struct ui_file *stream)
{
  int i;
  for (i = 0; i < n; i++)
    printchar (str[i], fputs_filtered, fprintf_filtered, stream, quoter);
}

void
fputstrn_unfiltered (const char *str, int n, int quoter,
		     struct ui_file *stream)
{
  int i;
  for (i = 0; i < n; i++)
    printchar (str[i], fputs_unfiltered, fprintf_unfiltered, stream, quoter);
}


/* Number of lines per page or UINT_MAX if paging is disabled.  */
static unsigned int lines_per_page;
static void
show_lines_per_page (struct ui_file *file, int from_tty,
		     struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("\
Number of lines gdb thinks are in a page is %s.\n"),
		    value);
}

/* Number of chars per line or UINT_MAX if line folding is disabled.  */
static unsigned int chars_per_line;
static void
show_chars_per_line (struct ui_file *file, int from_tty,
		     struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("\
Number of characters gdb thinks are in a line is %s.\n"),
		    value);
}

/* Current count of lines printed on this page, chars on this line.  */
static unsigned int lines_printed, chars_printed;

/* Buffer and start column of buffered text, for doing smarter word-
   wrapping.  When someone calls wrap_here(), we start buffering output
   that comes through fputs_filtered().  If we see a newline, we just
   spit it out and forget about the wrap_here().  If we see another
   wrap_here(), we spit it out and remember the newer one.  If we see
   the end of the line, we spit out a newline, the indent, and then
   the buffered output.  */

/* Malloc'd buffer with chars_per_line+2 bytes.  Contains characters which
   are waiting to be output (they have already been counted in chars_printed).
   When wrap_buffer[0] is null, the buffer is empty.  */
static char *wrap_buffer;

/* Pointer in wrap_buffer to the next character to fill.  */
static char *wrap_pointer;

/* String to indent by if the wrap occurs.  Must not be NULL if wrap_column
   is non-zero.  */
static char *wrap_indent;

/* Column number on the screen where wrap_buffer begins, or 0 if wrapping
   is not in effect.  */
static int wrap_column;


/* Inialize the number of lines per page and chars per line.  */

void
init_page_info (void)
{
#if defined(TUI)
  if (!tui_get_command_dimension (&chars_per_line, &lines_per_page))
#endif
    {
      int rows, cols;

#if defined(__GO32__)
      rows = ScreenRows ();
      cols = ScreenCols ();
      lines_per_page = rows;
      chars_per_line = cols;
#else
      /* Make sure Readline has initialized its terminal settings.  */
      rl_reset_terminal (NULL);

      /* Get the screen size from Readline.  */
      rl_get_screen_size (&rows, &cols);
      lines_per_page = rows;
      chars_per_line = cols;

      /* Readline should have fetched the termcap entry for us.  */
      if (tgetnum ("li") < 0 || getenv ("EMACS"))
	{
	  /* The number of lines per page is not mentioned in the
	     terminal description.  This probably means that paging is
	     not useful (e.g. emacs shell window), so disable paging.  */
	  lines_per_page = UINT_MAX;
	}

      /* FIXME: Get rid of this junk.  */
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
      SIGWINCH_HANDLER (SIGWINCH);
#endif

      /* If the output is not a terminal, don't paginate it.  */
      if (!ui_file_isatty (gdb_stdout))
	lines_per_page = UINT_MAX;
#endif
    }

  set_screen_size ();
  set_width ();
}

/* Set the screen size based on LINES_PER_PAGE and CHARS_PER_LINE.  */

static void
set_screen_size (void)
{
  int rows = lines_per_page;
  int cols = chars_per_line;

  if (rows <= 0)
    rows = INT_MAX;

  if (cols <= 0)
    cols = INT_MAX;

  /* Update Readline's idea of the terminal size.  */
  rl_set_screen_size (rows, cols);
}

/* Reinitialize WRAP_BUFFER according to the current value of
   CHARS_PER_LINE.  */

static void
set_width (void)
{
  if (chars_per_line == 0)
    init_page_info ();

  if (!wrap_buffer)
    {
      wrap_buffer = (char *) xmalloc (chars_per_line + 2);
      wrap_buffer[0] = '\0';
    }
  else
    wrap_buffer = (char *) xrealloc (wrap_buffer, chars_per_line + 2);
  wrap_pointer = wrap_buffer;	/* Start it at the beginning.  */
}

static void
set_width_command (char *args, int from_tty, struct cmd_list_element *c)
{
  set_screen_size ();
  set_width ();
}

static void
set_height_command (char *args, int from_tty, struct cmd_list_element *c)
{
  set_screen_size ();
}

/* Wait, so the user can read what's on the screen.  Prompt the user
   to continue by pressing RETURN.  */

static void
prompt_for_continue (void)
{
  char *ignore;
  char cont_prompt[120];

  if (annotation_level > 1)
    printf_unfiltered (("\n\032\032pre-prompt-for-continue\n"));

  strcpy (cont_prompt,
	  "---Type <return> to continue, or q <return> to quit---");
  if (annotation_level > 1)
    strcat (cont_prompt, "\n\032\032prompt-for-continue\n");

  /* We must do this *before* we call gdb_readline, else it will eventually
     call us -- thinking that we're trying to print beyond the end of the 
     screen.  */
  reinitialize_more_filter ();

  immediate_quit++;
  /* On a real operating system, the user can quit with SIGINT.
     But not on GO32.

     'q' is provided on all systems so users don't have to change habits
     from system to system, and because telling them what to do in
     the prompt is more user-friendly than expecting them to think of
     SIGINT.  */
  /* Call readline, not gdb_readline, because GO32 readline handles control-C
     whereas control-C to gdb_readline will cause the user to get dumped
     out to DOS.  */
  ignore = gdb_readline_wrapper (cont_prompt);

  if (annotation_level > 1)
    printf_unfiltered (("\n\032\032post-prompt-for-continue\n"));

  if (ignore)
    {
      char *p = ignore;
      while (*p == ' ' || *p == '\t')
	++p;
      if (p[0] == 'q')
	async_request_quit (0);
      xfree (ignore);
    }
  immediate_quit--;

  /* Now we have to do this again, so that GDB will know that it doesn't
     need to save the ---Type <return>--- line at the top of the screen.  */
  reinitialize_more_filter ();

  dont_repeat ();		/* Forget prev cmd -- CR won't repeat it. */
}

/* Reinitialize filter; ie. tell it to reset to original values.  */

void
reinitialize_more_filter (void)
{
  lines_printed = 0;
  chars_printed = 0;
}

/* Indicate that if the next sequence of characters overflows the line,
   a newline should be inserted here rather than when it hits the end. 
   If INDENT is non-null, it is a string to be printed to indent the
   wrapped part on the next line.  INDENT must remain accessible until
   the next call to wrap_here() or until a newline is printed through
   fputs_filtered().

   If the line is already overfull, we immediately print a newline and
   the indentation, and disable further wrapping.

   If we don't know the width of lines, but we know the page height,
   we must not wrap words, but should still keep track of newlines
   that were explicitly printed.

   INDENT should not contain tabs, as that will mess up the char count
   on the next line.  FIXME.

   This routine is guaranteed to force out any output which has been
   squirreled away in the wrap_buffer, so wrap_here ((char *)0) can be
   used to force out output from the wrap_buffer.  */

void
wrap_here (char *indent)
{
  /* This should have been allocated, but be paranoid anyway. */
  if (!wrap_buffer)
    internal_error (__FILE__, __LINE__, _("failed internal consistency check"));

  if (wrap_buffer[0])
    {
      *wrap_pointer = '\0';
      fputs_unfiltered (wrap_buffer, gdb_stdout);
    }
  wrap_pointer = wrap_buffer;
  wrap_buffer[0] = '\0';
  if (chars_per_line == UINT_MAX)	/* No line overflow checking */
    {
      wrap_column = 0;
    }
  else if (chars_printed >= chars_per_line)
    {
      puts_filtered ("\n");
      if (indent != NULL)
	puts_filtered (indent);
      wrap_column = 0;
    }
  else
    {
      wrap_column = chars_printed;
      if (indent == NULL)
	wrap_indent = "";
      else
	wrap_indent = indent;
    }
}

/* Print input string to gdb_stdout, filtered, with wrap, 
   arranging strings in columns of n chars. String can be
   right or left justified in the column.  Never prints 
   trailing spaces.  String should never be longer than
   width.  FIXME: this could be useful for the EXAMINE 
   command, which currently doesn't tabulate very well */

void
puts_filtered_tabular (char *string, int width, int right)
{
  int spaces = 0;
  int stringlen;
  char *spacebuf;

  gdb_assert (chars_per_line > 0);
  if (chars_per_line == UINT_MAX)
    {
      fputs_filtered (string, gdb_stdout);
      fputs_filtered ("\n", gdb_stdout);
      return;
    }

  if (((chars_printed - 1) / width + 2) * width >= chars_per_line)
    fputs_filtered ("\n", gdb_stdout);

  if (width >= chars_per_line)
    width = chars_per_line - 1;

  stringlen = strlen (string);

  if (chars_printed > 0)
    spaces = width - (chars_printed - 1) % width - 1;
  if (right)
    spaces += width - stringlen;

  spacebuf = alloca (spaces + 1);
  spacebuf[spaces] = '\0';
  while (spaces--)
    spacebuf[spaces] = ' ';

  fputs_filtered (spacebuf, gdb_stdout);
  fputs_filtered (string, gdb_stdout);
}


/* Ensure that whatever gets printed next, using the filtered output
   commands, starts at the beginning of the line.  I.E. if there is
   any pending output for the current line, flush it and start a new
   line.  Otherwise do nothing. */

void
begin_line (void)
{
  if (chars_printed > 0)
    {
      puts_filtered ("\n");
    }
}


/* Like fputs but if FILTER is true, pause after every screenful.

   Regardless of FILTER can wrap at points other than the final
   character of a line.

   Unlike fputs, fputs_maybe_filtered does not return a value.
   It is OK for LINEBUFFER to be NULL, in which case just don't print
   anything.

   Note that a longjmp to top level may occur in this routine (only if
   FILTER is true) (since prompt_for_continue may do so) so this
   routine should not be called when cleanups are not in place.  */

static void
fputs_maybe_filtered (const char *linebuffer, struct ui_file *stream,
		      int filter)
{
  const char *lineptr;

  if (linebuffer == 0)
    return;

  /* Don't do any filtering if it is disabled.  */
  if ((stream != gdb_stdout) || !pagination_enabled
      || (lines_per_page == UINT_MAX && chars_per_line == UINT_MAX))
    {
      fputs_unfiltered (linebuffer, stream);
      return;
    }

  /* Go through and output each character.  Show line extension
     when this is necessary; prompt user for new page when this is
     necessary.  */

  lineptr = linebuffer;
  while (*lineptr)
    {
      /* Possible new page.  */
      if (filter && (lines_printed >= lines_per_page - 1))
	prompt_for_continue ();

      while (*lineptr && *lineptr != '\n')
	{
	  /* Print a single line.  */
	  if (*lineptr == '\t')
	    {
	      if (wrap_column)
		*wrap_pointer++ = '\t';
	      else
		fputc_unfiltered ('\t', stream);
	      /* Shifting right by 3 produces the number of tab stops
	         we have already passed, and then adding one and
	         shifting left 3 advances to the next tab stop.  */
	      chars_printed = ((chars_printed >> 3) + 1) << 3;
	      lineptr++;
	    }
	  else
	    {
	      if (wrap_column)
		*wrap_pointer++ = *lineptr;
	      else
		fputc_unfiltered (*lineptr, stream);
	      chars_printed++;
	      lineptr++;
	    }

	  if (chars_printed >= chars_per_line)
	    {
	      unsigned int save_chars = chars_printed;

	      chars_printed = 0;
	      lines_printed++;
	      /* If we aren't actually wrapping, don't output newline --
	         if chars_per_line is right, we probably just overflowed
	         anyway; if it's wrong, let us keep going.  */
	      if (wrap_column)
		fputc_unfiltered ('\n', stream);

	      /* Possible new page.  */
	      if (lines_printed >= lines_per_page - 1)
		prompt_for_continue ();

	      /* Now output indentation and wrapped string */
	      if (wrap_column)
		{
		  fputs_unfiltered (wrap_indent, stream);
		  *wrap_pointer = '\0';	/* Null-terminate saved stuff */
		  fputs_unfiltered (wrap_buffer, stream);	/* and eject it */
		  /* FIXME, this strlen is what prevents wrap_indent from
		     containing tabs.  However, if we recurse to print it
		     and count its chars, we risk trouble if wrap_indent is
		     longer than (the user settable) chars_per_line. 
		     Note also that this can set chars_printed > chars_per_line
		     if we are printing a long string.  */
		  chars_printed = strlen (wrap_indent)
		    + (save_chars - wrap_column);
		  wrap_pointer = wrap_buffer;	/* Reset buffer */
		  wrap_buffer[0] = '\0';
		  wrap_column = 0;	/* And disable fancy wrap */
		}
	    }
	}

      if (*lineptr == '\n')
	{
	  chars_printed = 0;
	  wrap_here ((char *) 0);	/* Spit out chars, cancel further wraps */
	  lines_printed++;
	  fputc_unfiltered ('\n', stream);
	  lineptr++;
	}
    }
}

void
fputs_filtered (const char *linebuffer, struct ui_file *stream)
{
  fputs_maybe_filtered (linebuffer, stream, 1);
}

int
putchar_unfiltered (int c)
{
  char buf = c;
  ui_file_write (gdb_stdout, &buf, 1);
  return c;
}

/* Write character C to gdb_stdout using GDB's paging mechanism and return C.
   May return nonlocally.  */

int
putchar_filtered (int c)
{
  return fputc_filtered (c, gdb_stdout);
}

int
fputc_unfiltered (int c, struct ui_file *stream)
{
  char buf = c;
  ui_file_write (stream, &buf, 1);
  return c;
}

int
fputc_filtered (int c, struct ui_file *stream)
{
  char buf[2];

  buf[0] = c;
  buf[1] = 0;
  fputs_filtered (buf, stream);
  return c;
}

/* puts_debug is like fputs_unfiltered, except it prints special
   characters in printable fashion.  */

void
puts_debug (char *prefix, char *string, char *suffix)
{
  int ch;

  /* Print prefix and suffix after each line.  */
  static int new_line = 1;
  static int return_p = 0;
  static char *prev_prefix = "";
  static char *prev_suffix = "";

  if (*string == '\n')
    return_p = 0;

  /* If the prefix is changing, print the previous suffix, a new line,
     and the new prefix.  */
  if ((return_p || (strcmp (prev_prefix, prefix) != 0)) && !new_line)
    {
      fputs_unfiltered (prev_suffix, gdb_stdlog);
      fputs_unfiltered ("\n", gdb_stdlog);
      fputs_unfiltered (prefix, gdb_stdlog);
    }

  /* Print prefix if we printed a newline during the previous call.  */
  if (new_line)
    {
      new_line = 0;
      fputs_unfiltered (prefix, gdb_stdlog);
    }

  prev_prefix = prefix;
  prev_suffix = suffix;

  /* Output characters in a printable format.  */
  while ((ch = *string++) != '\0')
    {
      switch (ch)
	{
	default:
	  if (isprint (ch))
	    fputc_unfiltered (ch, gdb_stdlog);

	  else
	    fprintf_unfiltered (gdb_stdlog, "\\x%02x", ch & 0xff);
	  break;

	case '\\':
	  fputs_unfiltered ("\\\\", gdb_stdlog);
	  break;
	case '\b':
	  fputs_unfiltered ("\\b", gdb_stdlog);
	  break;
	case '\f':
	  fputs_unfiltered ("\\f", gdb_stdlog);
	  break;
	case '\n':
	  new_line = 1;
	  fputs_unfiltered ("\\n", gdb_stdlog);
	  break;
	case '\r':
	  fputs_unfiltered ("\\r", gdb_stdlog);
	  break;
	case '\t':
	  fputs_unfiltered ("\\t", gdb_stdlog);
	  break;
	case '\v':
	  fputs_unfiltered ("\\v", gdb_stdlog);
	  break;
	}

      return_p = ch == '\r';
    }

  /* Print suffix if we printed a newline.  */
  if (new_line)
    {
      fputs_unfiltered (suffix, gdb_stdlog);
      fputs_unfiltered ("\n", gdb_stdlog);
    }
}


/* Print a variable number of ARGS using format FORMAT.  If this
   information is going to put the amount written (since the last call
   to REINITIALIZE_MORE_FILTER or the last page break) over the page size,
   call prompt_for_continue to get the users permision to continue.

   Unlike fprintf, this function does not return a value.

   We implement three variants, vfprintf (takes a vararg list and stream),
   fprintf (takes a stream to write on), and printf (the usual).

   Note also that a longjmp to top level may occur in this routine
   (since prompt_for_continue may do so) so this routine should not be
   called when cleanups are not in place.  */

static void
vfprintf_maybe_filtered (struct ui_file *stream, const char *format,
			 va_list args, int filter)
{
  char *linebuffer;
  struct cleanup *old_cleanups;

  linebuffer = xstrvprintf (format, args);
  old_cleanups = make_cleanup (xfree, linebuffer);
  fputs_maybe_filtered (linebuffer, stream, filter);
  do_cleanups (old_cleanups);
}


void
vfprintf_filtered (struct ui_file *stream, const char *format, va_list args)
{
  vfprintf_maybe_filtered (stream, format, args, 1);
}

void
vfprintf_unfiltered (struct ui_file *stream, const char *format, va_list args)
{
  char *linebuffer;
  struct cleanup *old_cleanups;

  linebuffer = xstrvprintf (format, args);
  old_cleanups = make_cleanup (xfree, linebuffer);
  if (debug_timestamp && stream == gdb_stdlog)
    {
      struct timeval tm;
      char *timestamp;

      gettimeofday (&tm, NULL);
      timestamp = xstrprintf ("%ld:%ld ", (long) tm.tv_sec, (long) tm.tv_usec);
      make_cleanup (xfree, timestamp);
      fputs_unfiltered (timestamp, stream);
    }
  fputs_unfiltered (linebuffer, stream);
  do_cleanups (old_cleanups);
}

void
vprintf_filtered (const char *format, va_list args)
{
  vfprintf_maybe_filtered (gdb_stdout, format, args, 1);
}

void
vprintf_unfiltered (const char *format, va_list args)
{
  vfprintf_unfiltered (gdb_stdout, format, args);
}

void
fprintf_filtered (struct ui_file *stream, const char *format, ...)
{
  va_list args;
  va_start (args, format);
  vfprintf_filtered (stream, format, args);
  va_end (args);
}

void
fprintf_unfiltered (struct ui_file *stream, const char *format, ...)
{
  va_list args;
  va_start (args, format);
  vfprintf_unfiltered (stream, format, args);
  va_end (args);
}

/* Like fprintf_filtered, but prints its result indented.
   Called as fprintfi_filtered (spaces, stream, format, ...);  */

void
fprintfi_filtered (int spaces, struct ui_file *stream, const char *format,
		   ...)
{
  va_list args;
  va_start (args, format);
  print_spaces_filtered (spaces, stream);

  vfprintf_filtered (stream, format, args);
  va_end (args);
}


void
printf_filtered (const char *format, ...)
{
  va_list args;
  va_start (args, format);
  vfprintf_filtered (gdb_stdout, format, args);
  va_end (args);
}


void
printf_unfiltered (const char *format, ...)
{
  va_list args;
  va_start (args, format);
  vfprintf_unfiltered (gdb_stdout, format, args);
  va_end (args);
}

/* Like printf_filtered, but prints it's result indented.
   Called as printfi_filtered (spaces, format, ...);  */

void
printfi_filtered (int spaces, const char *format, ...)
{
  va_list args;
  va_start (args, format);
  print_spaces_filtered (spaces, gdb_stdout);
  vfprintf_filtered (gdb_stdout, format, args);
  va_end (args);
}

/* Easy -- but watch out!

   This routine is *not* a replacement for puts()!  puts() appends a newline.
   This one doesn't, and had better not!  */

void
puts_filtered (const char *string)
{
  fputs_filtered (string, gdb_stdout);
}

void
puts_unfiltered (const char *string)
{
  fputs_unfiltered (string, gdb_stdout);
}

/* Return a pointer to N spaces and a null.  The pointer is good
   until the next call to here.  */
char *
n_spaces (int n)
{
  char *t;
  static char *spaces = 0;
  static int max_spaces = -1;

  if (n > max_spaces)
    {
      if (spaces)
	xfree (spaces);
      spaces = (char *) xmalloc (n + 1);
      for (t = spaces + n; t != spaces;)
	*--t = ' ';
      spaces[n] = '\0';
      max_spaces = n;
    }

  return spaces + max_spaces - n;
}

/* Print N spaces.  */
void
print_spaces_filtered (int n, struct ui_file *stream)
{
  fputs_filtered (n_spaces (n), stream);
}

/* C++/ObjC demangler stuff.  */

/* fprintf_symbol_filtered attempts to demangle NAME, a symbol in language
   LANG, using demangling args ARG_MODE, and print it filtered to STREAM.
   If the name is not mangled, or the language for the name is unknown, or
   demangling is off, the name is printed in its "raw" form. */

void
fprintf_symbol_filtered (struct ui_file *stream, char *name,
			 enum language lang, int arg_mode)
{
  char *demangled;

  if (name != NULL)
    {
      /* If user wants to see raw output, no problem.  */
      if (!demangle)
	{
	  fputs_filtered (name, stream);
	}
      else
	{
	  demangled = language_demangle (language_def (lang), name, arg_mode);
	  fputs_filtered (demangled ? demangled : name, stream);
	  if (demangled != NULL)
	    {
	      xfree (demangled);
	    }
	}
    }
}

/* Do a strcmp() type operation on STRING1 and STRING2, ignoring any
   differences in whitespace.  Returns 0 if they match, non-zero if they
   don't (slightly different than strcmp()'s range of return values).

   As an extra hack, string1=="FOO(ARGS)" matches string2=="FOO".
   This "feature" is useful when searching for matching C++ function names
   (such as if the user types 'break FOO', where FOO is a mangled C++
   function). */

int
strcmp_iw (const char *string1, const char *string2)
{
  while ((*string1 != '\0') && (*string2 != '\0'))
    {
      while (isspace (*string1))
	{
	  string1++;
	}
      while (isspace (*string2))
	{
	  string2++;
	}
      if (*string1 != *string2)
	{
	  break;
	}
      if (*string1 != '\0')
	{
	  string1++;
	  string2++;
	}
    }
  return (*string1 != '\0' && *string1 != '(') || (*string2 != '\0');
}

/* This is like strcmp except that it ignores whitespace and treats
   '(' as the first non-NULL character in terms of ordering.  Like
   strcmp (and unlike strcmp_iw), it returns negative if STRING1 <
   STRING2, 0 if STRING2 = STRING2, and positive if STRING1 > STRING2
   according to that ordering.

   If a list is sorted according to this function and if you want to
   find names in the list that match some fixed NAME according to
   strcmp_iw(LIST_ELT, NAME), then the place to start looking is right
   where this function would put NAME.

   Here are some examples of why using strcmp to sort is a bad idea:

   Whitespace example:

   Say your partial symtab contains: "foo<char *>", "goo".  Then, if
   we try to do a search for "foo<char*>", strcmp will locate this
   after "foo<char *>" and before "goo".  Then lookup_partial_symbol
   will start looking at strings beginning with "goo", and will never
   see the correct match of "foo<char *>".

   Parenthesis example:

   In practice, this is less like to be an issue, but I'll give it a
   shot.  Let's assume that '$' is a legitimate character to occur in
   symbols.  (Which may well even be the case on some systems.)  Then
   say that the partial symbol table contains "foo$" and "foo(int)".
   strcmp will put them in this order, since '$' < '('.  Now, if the
   user searches for "foo", then strcmp will sort "foo" before "foo$".
   Then lookup_partial_symbol will notice that strcmp_iw("foo$",
   "foo") is false, so it won't proceed to the actual match of
   "foo(int)" with "foo".  */

int
strcmp_iw_ordered (const char *string1, const char *string2)
{
  while ((*string1 != '\0') && (*string2 != '\0'))
    {
      while (isspace (*string1))
	{
	  string1++;
	}
      while (isspace (*string2))
	{
	  string2++;
	}
      if (*string1 != *string2)
	{
	  break;
	}
      if (*string1 != '\0')
	{
	  string1++;
	  string2++;
	}
    }

  switch (*string1)
    {
      /* Characters are non-equal unless they're both '\0'; we want to
	 make sure we get the comparison right according to our
	 comparison in the cases where one of them is '\0' or '('.  */
    case '\0':
      if (*string2 == '\0')
	return 0;
      else
	return -1;
    case '(':
      if (*string2 == '\0')
	return 1;
      else
	return -1;
    default:
      if (*string2 == '(')
	return 1;
      else
	return *string1 - *string2;
    }
}

/* A simple comparison function with opposite semantics to strcmp.  */

int
streq (const char *lhs, const char *rhs)
{
  return !strcmp (lhs, rhs);
}


/*
   ** subset_compare()
   **    Answer whether string_to_compare is a full or partial match to
   **    template_string.  The partial match must be in sequence starting
   **    at index 0.
 */
int
subset_compare (char *string_to_compare, char *template_string)
{
  int match;
  if (template_string != (char *) NULL && string_to_compare != (char *) NULL
      && strlen (string_to_compare) <= strlen (template_string))
    match =
      (strncmp
       (template_string, string_to_compare, strlen (string_to_compare)) == 0);
  else
    match = 0;
  return match;
}

static void
pagination_on_command (char *arg, int from_tty)
{
  pagination_enabled = 1;
}

static void
pagination_off_command (char *arg, int from_tty)
{
  pagination_enabled = 0;
}

static void
show_debug_timestamp (struct ui_file *file, int from_tty,
		      struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("Timestamping debugging messages is %s.\n"), value);
}


void
initialize_utils (void)
{
  struct cmd_list_element *c;

  add_setshow_uinteger_cmd ("width", class_support, &chars_per_line, _("\
Set number of characters gdb thinks are in a line."), _("\
Show number of characters gdb thinks are in a line."), NULL,
			    set_width_command,
			    show_chars_per_line,
			    &setlist, &showlist);

  add_setshow_uinteger_cmd ("height", class_support, &lines_per_page, _("\
Set number of lines gdb thinks are in a page."), _("\
Show number of lines gdb thinks are in a page."), NULL,
			    set_height_command,
			    show_lines_per_page,
			    &setlist, &showlist);

  init_page_info ();

  add_setshow_boolean_cmd ("demangle", class_support, &demangle, _("\
Set demangling of encoded C++/ObjC names when displaying symbols."), _("\
Show demangling of encoded C++/ObjC names when displaying symbols."), NULL,
			   NULL,
			   show_demangle,
			   &setprintlist, &showprintlist);

  add_setshow_boolean_cmd ("pagination", class_support,
			   &pagination_enabled, _("\
Set state of pagination."), _("\
Show state of pagination."), NULL,
			   NULL,
			   show_pagination_enabled,
			   &setlist, &showlist);

  if (xdb_commands)
    {
      add_com ("am", class_support, pagination_on_command,
	       _("Enable pagination"));
      add_com ("sm", class_support, pagination_off_command,
	       _("Disable pagination"));
    }

  add_setshow_boolean_cmd ("sevenbit-strings", class_support,
			   &sevenbit_strings, _("\
Set printing of 8-bit characters in strings as \\nnn."), _("\
Show printing of 8-bit characters in strings as \\nnn."), NULL,
			   NULL,
			   show_sevenbit_strings,
			   &setprintlist, &showprintlist);

  add_setshow_boolean_cmd ("asm-demangle", class_support, &asm_demangle, _("\
Set demangling of C++/ObjC names in disassembly listings."), _("\
Show demangling of C++/ObjC names in disassembly listings."), NULL,
			   NULL,
			   show_asm_demangle,
			   &setprintlist, &showprintlist);

  add_setshow_boolean_cmd ("timestamp", class_maintenance,
			    &debug_timestamp, _("\
Set timestamping of debugging messages."), _("\
Show timestamping of debugging messages."), _("\
When set, debugging messages will be marked with seconds and microseconds."),
			   NULL,
			   show_debug_timestamp,
			   &setdebuglist, &showdebuglist);
}

/* Machine specific function to handle SIGWINCH signal. */

#ifdef  SIGWINCH_HANDLER_BODY
SIGWINCH_HANDLER_BODY
#endif
/* print routines to handle variable size regs, etc. */
/* temporary storage using circular buffer */
#define NUMCELLS 16
#define CELLSIZE 50
static char *
get_cell (void)
{
  static char buf[NUMCELLS][CELLSIZE];
  static int cell = 0;
  if (++cell >= NUMCELLS)
    cell = 0;
  return buf[cell];
}

int
strlen_paddr (void)
{
  return (gdbarch_addr_bit (current_gdbarch) / 8 * 2);
}

char *
paddr (CORE_ADDR addr)
{
  return phex (addr, gdbarch_addr_bit (current_gdbarch) / 8);
}

char *
paddr_nz (CORE_ADDR addr)
{
  return phex_nz (addr, gdbarch_addr_bit (current_gdbarch) / 8);
}

const char *
paddress (CORE_ADDR addr)
{
  /* Truncate address to the size of a target address, avoiding shifts
     larger or equal than the width of a CORE_ADDR.  The local
     variable ADDR_BIT stops the compiler reporting a shift overflow
     when it won't occur. */
  /* NOTE: This assumes that the significant address information is
     kept in the least significant bits of ADDR - the upper bits were
     either zero or sign extended.  Should gdbarch_address_to_pointer or
     some ADDRESS_TO_PRINTABLE() be used to do the conversion?  */

  int addr_bit = gdbarch_addr_bit (current_gdbarch);

  if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT))
    addr &= ((CORE_ADDR) 1 << addr_bit) - 1;
  return hex_string (addr);
}

static char *
decimal2str (char *sign, ULONGEST addr, int width)
{
  /* Steal code from valprint.c:print_decimal().  Should this worry
     about the real size of addr as the above does? */
  unsigned long temp[3];
  char *str = get_cell ();

  int i = 0;
  do
    {
      temp[i] = addr % (1000 * 1000 * 1000);
      addr /= (1000 * 1000 * 1000);
      i++;
      width -= 9;
    }
  while (addr != 0 && i < (sizeof (temp) / sizeof (temp[0])));

  width += 9;
  if (width < 0)
    width = 0;

  switch (i)
    {
    case 1:
      xsnprintf (str, CELLSIZE, "%s%0*lu", sign, width, temp[0]);
      break;
    case 2:
      xsnprintf (str, CELLSIZE, "%s%0*lu%09lu", sign, width,
		 temp[1], temp[0]);
      break;
    case 3:
      xsnprintf (str, CELLSIZE, "%s%0*lu%09lu%09lu", sign, width,
		 temp[2], temp[1], temp[0]);
      break;
    default:
      internal_error (__FILE__, __LINE__,
		      _("failed internal consistency check"));
    }

  return str;
}

static char *
octal2str (ULONGEST addr, int width)
{
  unsigned long temp[3];
  char *str = get_cell ();

  int i = 0;
  do
    {
      temp[i] = addr % (0100000 * 0100000);
      addr /= (0100000 * 0100000);
      i++;
      width -= 10;
    }
  while (addr != 0 && i < (sizeof (temp) / sizeof (temp[0])));

  width += 10;
  if (width < 0)
    width = 0;

  switch (i)
    {
    case 1:
      if (temp[0] == 0)
	xsnprintf (str, CELLSIZE, "%*o", width, 0);
      else
	xsnprintf (str, CELLSIZE, "0%0*lo", width, temp[0]);
      break;
    case 2:
      xsnprintf (str, CELLSIZE, "0%0*lo%010lo", width, temp[1], temp[0]);
      break;
    case 3:
      xsnprintf (str, CELLSIZE, "0%0*lo%010lo%010lo", width,
		 temp[2], temp[1], temp[0]);
      break;
    default:
      internal_error (__FILE__, __LINE__,
		      _("failed internal consistency check"));
    }

  return str;
}

char *
pulongest (ULONGEST u)
{
  return decimal2str ("", u, 0);
}

char *
plongest (LONGEST l)
{
  if (l < 0)
    return decimal2str ("-", -l, 0);
  else
    return decimal2str ("", l, 0);
}

/* Eliminate warning from compiler on 32-bit systems.  */
static int thirty_two = 32;

char *
phex (ULONGEST l, int sizeof_l)
{
  char *str;

  switch (sizeof_l)
    {
    case 8:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%08lx%08lx",
		 (unsigned long) (l >> thirty_two),
		 (unsigned long) (l & 0xffffffff));
      break;
    case 4:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%08lx", (unsigned long) l);
      break;
    case 2:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%04x", (unsigned short) (l & 0xffff));
      break;
    default:
      str = phex (l, sizeof (l));
      break;
    }

  return str;
}

char *
phex_nz (ULONGEST l, int sizeof_l)
{
  char *str;

  switch (sizeof_l)
    {
    case 8:
      {
	unsigned long high = (unsigned long) (l >> thirty_two);
	str = get_cell ();
	if (high == 0)
	  xsnprintf (str, CELLSIZE, "%lx",
		     (unsigned long) (l & 0xffffffff));
	else
	  xsnprintf (str, CELLSIZE, "%lx%08lx", high,
		     (unsigned long) (l & 0xffffffff));
	break;
      }
    case 4:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%lx", (unsigned long) l);
      break;
    case 2:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%x", (unsigned short) (l & 0xffff));
      break;
    default:
      str = phex_nz (l, sizeof (l));
      break;
    }

  return str;
}

/* Converts a LONGEST to a C-format hexadecimal literal and stores it
   in a static string.  Returns a pointer to this string.  */
char *
hex_string (LONGEST num)
{
  char *result = get_cell ();
  xsnprintf (result, CELLSIZE, "0x%s", phex_nz (num, sizeof (num)));
  return result;
}

/* Converts a LONGEST number to a C-format hexadecimal literal and
   stores it in a static string.  Returns a pointer to this string
   that is valid until the next call.  The number is padded on the
   left with 0s to at least WIDTH characters.  */
char *
hex_string_custom (LONGEST num, int width)
{
  char *result = get_cell ();
  char *result_end = result + CELLSIZE - 1;
  const char *hex = phex_nz (num, sizeof (num));
  int hex_len = strlen (hex);

  if (hex_len > width)
    width = hex_len;
  if (width + 2 >= CELLSIZE)
    internal_error (__FILE__, __LINE__,
		    _("hex_string_custom: insufficient space to store result"));

  strcpy (result_end - width - 2, "0x");
  memset (result_end - width, '0', width);
  strcpy (result_end - hex_len, hex);
  return result_end - width - 2;
}

/* Convert VAL to a numeral in the given radix.  For
 * radix 10, IS_SIGNED may be true, indicating a signed quantity;
 * otherwise VAL is interpreted as unsigned.  If WIDTH is supplied, 
 * it is the minimum width (0-padded if needed).  USE_C_FORMAT means
 * to use C format in all cases.  If it is false, then 'x' 
 * and 'o' formats do not include a prefix (0x or leading 0). */

char *
int_string (LONGEST val, int radix, int is_signed, int width, 
	    int use_c_format)
{
  switch (radix) 
    {
    case 16:
      {
	char *result;
	if (width == 0)
	  result = hex_string (val);
	else
	  result = hex_string_custom (val, width);
	if (! use_c_format)
	  result += 2;
	return result;
      }
    case 10:
      {
	if (is_signed && val < 0)
	  return decimal2str ("-", -val, width);
	else
	  return decimal2str ("", val, width);
      }
    case 8:
      {
	char *result = octal2str (val, width);
	if (use_c_format || val == 0)
	  return result;
	else
	  return result + 1;
      }
    default:
      internal_error (__FILE__, __LINE__,
		      _("failed internal consistency check"));
    }
}	

/* Convert a CORE_ADDR into a string.  */
const char *
core_addr_to_string (const CORE_ADDR addr)
{
  char *str = get_cell ();
  strcpy (str, "0x");
  strcat (str, phex (addr, sizeof (addr)));
  return str;
}

const char *
core_addr_to_string_nz (const CORE_ADDR addr)
{
  char *str = get_cell ();
  strcpy (str, "0x");
  strcat (str, phex_nz (addr, sizeof (addr)));
  return str;
}

/* Convert a string back into a CORE_ADDR.  */
CORE_ADDR
string_to_core_addr (const char *my_string)
{
  int addr_bit = gdbarch_addr_bit (current_gdbarch);
  CORE_ADDR addr = 0;

  if (my_string[0] == '0' && tolower (my_string[1]) == 'x')
    {
      /* Assume that it is in hex.  */
      int i;
      for (i = 2; my_string[i] != '\0'; i++)
	{
	  if (isdigit (my_string[i]))
	    addr = (my_string[i] - '0') + (addr * 16);
	  else if (isxdigit (my_string[i]))
	    addr = (tolower (my_string[i]) - 'a' + 0xa) + (addr * 16);
	  else
	    error (_("invalid hex \"%s\""), my_string);
	}

      /* Not very modular, but if the executable format expects
         addresses to be sign-extended, then do so if the address was
         specified with only 32 significant bits.  Really this should
         be determined by the target architecture, not by the object
         file.  */
      if (i - 2 == addr_bit / 4
	  && exec_bfd
	  && bfd_get_sign_extend_vma (exec_bfd))
	addr = (addr ^ ((CORE_ADDR) 1 << (addr_bit - 1)))
	       - ((CORE_ADDR) 1 << (addr_bit - 1));
    }
  else
    {
      /* Assume that it is in decimal.  */
      int i;
      for (i = 0; my_string[i] != '\0'; i++)
	{
	  if (isdigit (my_string[i]))
	    addr = (my_string[i] - '0') + (addr * 10);
	  else
	    error (_("invalid decimal \"%s\""), my_string);
	}
    }

  return addr;
}

const char *
host_address_to_string (const void *addr)
{
  char *str = get_cell ();
  sprintf (str, "0x%lx", (unsigned long) addr);
  return str;
}

char *
gdb_realpath (const char *filename)
{
  /* Method 1: The system has a compile time upper bound on a filename
     path.  Use that and realpath() to canonicalize the name.  This is
     the most common case.  Note that, if there isn't a compile time
     upper bound, you want to avoid realpath() at all costs.  */
#if defined(HAVE_REALPATH)
  {
# if defined (PATH_MAX)
    char buf[PATH_MAX];
#  define USE_REALPATH
# elif defined (MAXPATHLEN)
    char buf[MAXPATHLEN];
#  define USE_REALPATH
# endif
# if defined (USE_REALPATH)
    const char *rp = realpath (filename, buf);
    if (rp == NULL)
      rp = filename;
    return xstrdup (rp);
# endif
  }
#endif /* HAVE_REALPATH */

  /* Method 2: The host system (i.e., GNU) has the function
     canonicalize_file_name() which malloc's a chunk of memory and
     returns that, use that.  */
#if defined(HAVE_CANONICALIZE_FILE_NAME)
  {
    char *rp = canonicalize_file_name (filename);
    if (rp == NULL)
      return xstrdup (filename);
    else
      return rp;
  }
#endif

  /* FIXME: cagney/2002-11-13:

     Method 2a: Use realpath() with a NULL buffer.  Some systems, due
     to the problems described in in method 3, have modified their
     realpath() implementation so that it will allocate a buffer when
     NULL is passed in.  Before this can be used, though, some sort of
     configure time test would need to be added.  Otherwize the code
     will likely core dump.  */

  /* Method 3: Now we're getting desperate!  The system doesn't have a
     compile time buffer size and no alternative function.  Query the
     OS, using pathconf(), for the buffer limit.  Care is needed
     though, some systems do not limit PATH_MAX (return -1 for
     pathconf()) making it impossible to pass a correctly sized buffer
     to realpath() (it could always overflow).  On those systems, we
     skip this.  */
#if defined (HAVE_REALPATH) && defined (HAVE_UNISTD_H) && defined(HAVE_ALLOCA)
  {
    /* Find out the max path size.  */
    long path_max = pathconf ("/", _PC_PATH_MAX);
    if (path_max > 0)
      {
	/* PATH_MAX is bounded.  */
	char *buf = alloca (path_max);
	char *rp = realpath (filename, buf);
	return xstrdup (rp ? rp : filename);
      }
  }
#endif

  /* This system is a lost cause, just dup the buffer.  */
  return xstrdup (filename);
}

/* Return a copy of FILENAME, with its directory prefix canonicalized
   by gdb_realpath.  */

char *
xfullpath (const char *filename)
{
  const char *base_name = lbasename (filename);
  char *dir_name;
  char *real_path;
  char *result;

  /* Extract the basename of filename, and return immediately 
     a copy of filename if it does not contain any directory prefix. */
  if (base_name == filename)
    return xstrdup (filename);

  dir_name = alloca ((size_t) (base_name - filename + 2));
  /* Allocate enough space to store the dir_name + plus one extra
     character sometimes needed under Windows (see below), and
     then the closing \000 character */
  strncpy (dir_name, filename, base_name - filename);
  dir_name[base_name - filename] = '\000';

#ifdef HAVE_DOS_BASED_FILE_SYSTEM
  /* We need to be careful when filename is of the form 'd:foo', which
     is equivalent of d:./foo, which is totally different from d:/foo.  */
  if (strlen (dir_name) == 2 && isalpha (dir_name[0]) && dir_name[1] == ':')
    {
      dir_name[2] = '.';
      dir_name[3] = '\000';
    }
#endif

  /* Canonicalize the directory prefix, and build the resulting
     filename. If the dirname realpath already contains an ending
     directory separator, avoid doubling it.  */
  real_path = gdb_realpath (dir_name);
  if (IS_DIR_SEPARATOR (real_path[strlen (real_path) - 1]))
    result = concat (real_path, base_name, (char *)NULL);
  else
    result = concat (real_path, SLASH_STRING, base_name, (char *)NULL);

  xfree (real_path);
  return result;
}


/* This is the 32-bit CRC function used by the GNU separate debug
   facility.  An executable may contain a section named
   .gnu_debuglink, which holds the name of a separate executable file
   containing its debug info, and a checksum of that file's contents,
   computed using this function.  */
unsigned long
gnu_debuglink_crc32 (unsigned long crc, unsigned char *buf, size_t len)
{
  static const unsigned long crc32_table[256] = {
    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
    0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
    0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
    0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
    0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
    0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
    0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
    0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
    0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
    0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
    0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
    0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
    0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
    0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
    0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
    0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
    0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
    0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
    0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
    0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
    0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
    0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
    0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
    0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
    0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
    0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
    0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
    0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
    0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
    0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
    0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
    0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
    0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
    0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
    0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
    0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
    0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
    0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
    0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
    0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
    0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
    0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
    0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
    0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
    0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
    0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
    0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
    0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
    0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
    0x2d02ef8d
  };
  unsigned char *end;

  crc = ~crc & 0xffffffff;
  for (end = buf + len; buf < end; ++buf)
    crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
  return ~crc & 0xffffffff;;
}

ULONGEST
align_up (ULONGEST v, int n)
{
  /* Check that N is really a power of two.  */
  gdb_assert (n && (n & (n-1)) == 0);
  return (v + n - 1) & -n;
}

ULONGEST
align_down (ULONGEST v, int n)
{
  /* Check that N is really a power of two.  */
  gdb_assert (n && (n & (n-1)) == 0);
  return (v & -n);
}

/* Allocation function for the libiberty hash table which uses an
   obstack.  The obstack is passed as DATA.  */

void *
hashtab_obstack_allocate (void *data, size_t size, size_t count)
{
  unsigned int total = size * count;
  void *ptr = obstack_alloc ((struct obstack *) data, total);
  memset (ptr, 0, total);
  return ptr;
}

/* Trivial deallocation function for the libiberty splay tree and hash
   table - don't deallocate anything.  Rely on later deletion of the
   obstack.  DATA will be the obstack, although it is not needed
   here.  */

void
dummy_obstack_deallocate (void *object, void *data)
{
  return;
}

/* The bit offset of the highest byte in a ULONGEST, for overflow
   checking.  */

#define HIGH_BYTE_POSN ((sizeof (ULONGEST) - 1) * HOST_CHAR_BIT)

/* True (non-zero) iff DIGIT is a valid digit in radix BASE,
   where 2 <= BASE <= 36.  */

static int
is_digit_in_base (unsigned char digit, int base)
{
  if (!isalnum (digit))
    return 0;
  if (base <= 10)
    return (isdigit (digit) && digit < base + '0');
  else
    return (isdigit (digit) || tolower (digit) < base - 10 + 'a');
}

static int
digit_to_int (unsigned char c)
{
  if (isdigit (c))
    return c - '0';
  else
    return tolower (c) - 'a' + 10;
}

/* As for strtoul, but for ULONGEST results.  */

ULONGEST
strtoulst (const char *num, const char **trailer, int base)
{
  unsigned int high_part;
  ULONGEST result;
  int minus = 0;
  int i = 0;

  /* Skip leading whitespace.  */
  while (isspace (num[i]))
    i++;

  /* Handle prefixes.  */
  if (num[i] == '+')
    i++;
  else if (num[i] == '-')
    {
      minus = 1;
      i++;
    }

  if (base == 0 || base == 16)
    {
      if (num[i] == '0' && (num[i + 1] == 'x' || num[i + 1] == 'X'))
	{
	  i += 2;
	  if (base == 0)
	    base = 16;
	}
    }

  if (base == 0 && num[i] == '0')
    base = 8;

  if (base == 0)
    base = 10;

  if (base < 2 || base > 36)
    {
      errno = EINVAL;
      return 0;
    }

  result = high_part = 0;
  for (; is_digit_in_base (num[i], base); i += 1)
    {
      result = result * base + digit_to_int (num[i]);
      high_part = high_part * base + (unsigned int) (result >> HIGH_BYTE_POSN);
      result &= ((ULONGEST) 1 << HIGH_BYTE_POSN) - 1;
      if (high_part > 0xff)
	{
	  errno = ERANGE;
	  result = ~ (ULONGEST) 0;
	  high_part = 0;
	  minus = 0;
	  break;
	}
    }

  if (trailer != NULL)
    *trailer = &num[i];

  result = result + ((ULONGEST) high_part << HIGH_BYTE_POSN);
  if (minus)
    return -result;
  else
    return result;
}

/* Simple, portable version of dirname that does not modify its
   argument.  */

char *
ldirname (const char *filename)
{
  const char *base = lbasename (filename);
  char *dirname;

  while (base > filename && IS_DIR_SEPARATOR (base[-1]))
    --base;

  if (base == filename)
    return NULL;

  dirname = xmalloc (base - filename + 2);
  memcpy (dirname, filename, base - filename);

  /* On DOS based file systems, convert "d:foo" to "d:.", so that we
     create "d:./bar" later instead of the (different) "d:/bar".  */
  if (base - filename == 2 && IS_ABSOLUTE_PATH (base)
      && !IS_DIR_SEPARATOR (filename[0]))
    dirname[base++ - filename] = '.';

  dirname[base - filename] = '\0';
  return dirname;
}

/* Call libiberty's buildargv, and return the result.
   If buildargv fails due to out-of-memory, call nomem.
   Therefore, the returned value is guaranteed to be non-NULL,
   unless the parameter itself is NULL.  */

char **
gdb_buildargv (const char *s)
{
  char **argv = buildargv (s);
  if (s != NULL && argv == NULL)
    nomem (0);
  return argv;
}