aboutsummaryrefslogtreecommitdiff
path: root/gdb/utils.c
blob: 8277a97f715dd18e0f6edb48c28145488883f1f4 (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
/* General utility routines for GDB, the GNU debugger.
   Copyright 1986, 1989, 1990, 1991, 1992, 1995 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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#if !defined(__GO32__) && !defined(WIN32)
#include <sys/ioctl.h>
#include <sys/param.h>
#include <pwd.h>
#endif
#include <varargs.h>
#include <ctype.h>
#include <string.h>

#include "signals.h"
#include "gdbcmd.h"
#include "serial.h"
#include "bfd.h"
#include "target.h"
#include "demangle.h"
#include "expression.h"
#include "language.h"
#include "annotate.h"

#include "readline.h"

/* readline defines this.  */
#undef savestring

/* Prototypes for local functions */

#if defined (NO_MMALLOC) || defined (NO_MMALLOC_CHECK)
#else

static void
malloc_botch PARAMS ((void));

#endif /* NO_MMALLOC, etc */

static void
fatal_dump_core ();	/* Can't prototype with <varargs.h> usage... */

static void
prompt_for_continue PARAMS ((void));

static void 
set_width_command PARAMS ((char *, int, struct cmd_list_element *));

/* If this definition isn't overridden by the header files, assume
   that isatty and fileno exist on this system.  */
#ifndef ISATTY
#define ISATTY(FP)	(isatty (fileno (FP)))
#endif

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

static struct cleanup *cleanup_chain;

/* 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++ names should be printed out in their
   C++ form rather than raw.  */

int demangle = 1;

/* Nonzero means that encoded C++ names should be printed out in their
   C++ 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;

/* 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;

/* 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: ";

/* 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 (function, arg)
     void (*function) PARAMS ((PTR));
     PTR arg;
{
  register struct cleanup *new
    = (struct cleanup *) xmalloc (sizeof (struct cleanup));
  register struct cleanup *old_chain = cleanup_chain;

  new->next = cleanup_chain;
  new->function = function;
  new->arg = arg;
  cleanup_chain = new;

  return old_chain;
}

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

void
do_cleanups (old_chain)
     register struct cleanup *old_chain;
{
  register struct cleanup *ptr;
  while ((ptr = cleanup_chain) != old_chain)
    {
      cleanup_chain = ptr->next;	/* Do this first incase recursion */
      (*ptr->function) (ptr->arg);
      free (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 (old_chain)
     register struct cleanup *old_chain;
{
  register struct cleanup *ptr;
  while ((ptr = cleanup_chain) != old_chain)
    {
      cleanup_chain = ptr->next;
      free ((PTR)ptr);
    }
}

/* Set the cleanup_chain to 0, and return the old cleanup chain.  */
struct cleanup *
save_cleanups ()
{
  struct cleanup *old_chain = cleanup_chain;

  cleanup_chain = 0;
  return old_chain;
}

/* Restore the cleanup chain from a previously saved chain.  */
void
restore_cleanups (chain)
     struct cleanup *chain;
{
  cleanup_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 (location)
     char **location;
{
  free (*location);
}

/* 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. */

/* ARGSUSED */
void
null_cleanup (arg)
    char **arg;
{
}


/* Provide a hook for modules wishing to print their own warning messages
   to set up the terminal state in a compatible way, without them having
   to import all the target_<...> macros. */

void
warning_setup ()
{
  target_terminal_ours ();
  wrap_here("");			/* Force out any buffered output */
  gdb_flush (gdb_stdout);
}

/* 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. */

/* VARARGS */
void
warning (va_alist)
     va_dcl
{
  va_list args;
  char *string;

  va_start (args);
  target_terminal_ours ();
  wrap_here("");			/* Force out any buffered output */
  gdb_flush (gdb_stdout);
  if (warning_pre_print)
    fprintf_unfiltered (gdb_stderr, warning_pre_print);
  string = va_arg (args, char *);
  vfprintf_unfiltered (gdb_stderr, string, args);
  fprintf_unfiltered (gdb_stderr, "\n");
  va_end (args);
}

/* Start the printing of an error message.  Way to use this is to call
   this, output the error message (use filtered output), and then call
   return_to_top_level (RETURN_ERROR).  error() provides a convenient way to
   do this for the special case that the error message can be formatted with
   a single printf call, but this is more general.  */
void
error_begin ()
{
  target_terminal_ours ();
  wrap_here ("");			/* Force out any buffered output */
  gdb_flush (gdb_stdout);

  annotate_error_begin ();

  if (error_pre_print)
    fprintf_filtered (gdb_stderr, error_pre_print);
}

/* 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.  */

/* VARARGS */
NORETURN void
error (va_alist)
     va_dcl
{
  va_list args;
  char *string;

  va_start (args);

  if (error_hook)
    error_hook (args);		/* Never returns */

  error_begin ();
  string = va_arg (args, char *);
  vfprintf_filtered (gdb_stderr, string, args);
  fprintf_filtered (gdb_stderr, "\n");
  va_end (args);
  return_to_top_level (RETURN_ERROR);
}

/* Print an error message and exit reporting failure.
   This is for a error that we cannot continue from.
   The arguments are printed a la printf.

   This function cannot be declared volatile (NORETURN) in an
   ANSI environment because exit() is not declared volatile. */

/* VARARGS */
NORETURN void
fatal (va_alist)
     va_dcl
{
  va_list args;
  char *string;

  va_start (args);
  string = va_arg (args, char *);
  fprintf_unfiltered (gdb_stderr, "\ngdb: ");
  vfprintf_unfiltered (gdb_stderr, string, args);
  fprintf_unfiltered (gdb_stderr, "\n");
  va_end (args);
  exit (1);
}

/* Print an error message and exit, dumping core.
   The arguments are printed a la printf ().  */

/* VARARGS */
static void
fatal_dump_core (va_alist)
     va_dcl
{
  va_list args;
  char *string;

  va_start (args);
  string = va_arg (args, char *);
  /* "internal error" is always correct, since GDB should never dump
     core, no matter what the input.  */
  fprintf_unfiltered (gdb_stderr, "\ngdb internal error: ");
  vfprintf_unfiltered (gdb_stderr, string, args);
  fprintf_unfiltered (gdb_stderr, "\n");
  va_end (args);

  signal (SIGQUIT, SIG_DFL);
  kill (getpid (), SIGQUIT);
  /* We should never get here, but just in case...  */
  exit (1);
}

/* The strerror() function can return NULL for errno values that are
   out of range.  Provide a "safe" version that always returns a
   printable string. */

char *
safe_strerror (errnum)
     int errnum;
{
  char *msg;
  static char buf[32];

  if ((msg = strerror (errnum)) == NULL)
    {
      sprintf (buf, "(undocumented errno %d)", errnum);
      msg = buf;
    }
  return (msg);
}

/* The strsignal() function can return NULL for signal values that are
   out of range.  Provide a "safe" version that always returns a
   printable string. */

char *
safe_strsignal (signo)
     int signo;
{
  char *msg;
  static char buf[32];

  if ((msg = strsignal (signo)) == NULL)
    {
      sprintf (buf, "(undocumented signal %d)", signo);
      msg = buf;
    }
  return (msg);
}


/* 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.  */

void
perror_with_name (string)
     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 (string, errcode)
     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 ()
{
  serial_t gdb_stdout_serial = serial_fdopen (1);

  target_terminal_ours ();

  /* We want all output to appear now, before we print "Quit".  We
     have 3 levels of buffering we have to flush (it's possible that
     some of these should be changed to flush the lower-level ones
     too):  */

  /* 1.  The _filtered buffer.  */
  wrap_here ((char *)0);

  /* 2.  The stdio buffer.  */
  gdb_flush (gdb_stdout);
  gdb_flush (gdb_stderr);

  /* 3.  The system-level buffer.  */
  SERIAL_FLUSH_OUTPUT (gdb_stdout_serial);
  SERIAL_UN_FDOPEN (gdb_stdout_serial);

  annotate_error_begin ();

  /* Don't use *_filtered; we don't want to prompt the user to continue.  */
  if (quit_pre_print)
    fprintf_unfiltered (gdb_stderr, quit_pre_print);

  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)
    fprintf_unfiltered (gdb_stderr, "Quit\n");
  else
    fprintf_unfiltered (gdb_stderr,
	     "Quit (expect signal SIGINT when the program is resumed)\n");
  return_to_top_level (RETURN_QUIT);
}


#if defined(__GO32__)||defined(WIN32)

/* In the absence of signals, poll keyboard for a quit.
   Called from #define QUIT pollquit() in xm-go32.h. */

void
pollquit()
{
  if (kbhit ())
    {
      int k = getkey ();
      if (k == 1) {
	quit_flag = 1;
	quit();
      }
      else if (k == 2) {
	immediate_quit = 1;
	quit ();
      }
      else 
	{
	  /* We just ignore it */
	  fprintf_unfiltered (gdb_stderr, "CTRL-A to quit, CTRL-B to quit harder\n");
	}
    }
}


#endif
#if defined(__GO32__)||defined(WIN32)
void notice_quit()
{
  if (kbhit ())
    {
      int k = getkey ();
      if (k == 1) {
	quit_flag = 1;
      }
      else if (k == 2)
	{
	  immediate_quit = 1;
	}
      else 
	{
	  fprintf_unfiltered (gdb_stderr, "CTRL-A to quit, CTRL-B to quit harder\n");
	}
    }
}
#else
void notice_quit()
{
  /* Done by signals */
}
#endif
/* Control C comes here */

void
request_quit (signo)
     int signo;
{
  quit_flag = 1;

  /* Restore the signal handler.  Harmless with BSD-style signals, needed
     for System V-style signals.  So just always do it, rather than worrying
     about USG defines and stuff like that.  */
  signal (signo, request_quit);

#ifdef REQUEST_QUIT
  REQUEST_QUIT;
#else
  if (immediate_quit)
    quit ();
#endif
}


/* Memory management stuff (malloc friends).  */

#if defined (NO_MMALLOC)

/* Make a substitute size_t for non-ANSI compilers. */

#ifdef _AIX
#include <stddef.h>
#else /* Not AIX */
#ifndef __STDC__
#ifndef size_t
#define size_t unsigned int
#endif
#endif
#endif /* Not AIX */

PTR
mmalloc (md, size)
     PTR md;
     size_t size;
{
  return malloc (size);
}

PTR
mrealloc (md, ptr, size)
     PTR md;
     PTR ptr;
     size_t size;
{
  if (ptr == 0)		/* Guard against old realloc's */
    return malloc (size);
  else
    return realloc (ptr, size);
}

void
mfree (md, ptr)
     PTR md;
     PTR ptr;
{
  free (ptr);
}

#endif	/* NO_MMALLOC */

#if defined (NO_MMALLOC) || defined (NO_MMALLOC_CHECK)

void
init_malloc (md)
     PTR md;
{
}

#else /* have mmalloc and want corruption checking  */

static void
malloc_botch ()
{
  fatal_dump_core ("Memory corruption");
}

/* Attempt to install hooks in mmalloc/mrealloc/mfree for the heap specified
   by MD, to detect memory corruption.  Note that MD may be NULL to specify
   the default heap that grows via sbrk.

   Note that for freshly created regions, we must call mmcheck prior to any
   mallocs in the region.  Otherwise, any region which was allocated prior to
   installing the checking hooks, which is later reallocated or freed, will
   fail the checks!  The mmcheck function only allows initial hooks to be
   installed before the first mmalloc.  However, anytime after we have called
   mmcheck the first time to install the checking hooks, we can call it again
   to update the function pointer to the memory corruption handler.

   Returns zero on failure, non-zero on success. */

void
init_malloc (md)
     PTR md;
{
  if (!mmcheck (md, malloc_botch))
    {
      warning ("internal error: failed to install memory consistency checks");
    }

  mmtrace ();
}

#endif /* Have mmalloc and want corruption checking  */

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

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

/* Like mmalloc but get error if no storage available, and protect against
   the caller wanting to allocate zero bytes.  Whether to return NULL for
   a zero byte request, or translate the request into a request for one
   byte of zero'd storage, is a religious issue. */

PTR
xmmalloc (md, size)
     PTR md;
     long size;
{
  register PTR val;

  if (size == 0)
    {
      val = NULL;
    }
  else if ((val = mmalloc (md, size)) == NULL)
    {
      nomem (size);
    }
  return (val);
}

/* Like mrealloc but get error if no storage available.  */

PTR
xmrealloc (md, ptr, size)
     PTR md;
     PTR ptr;
     long size;
{
  register PTR val;

  if (ptr != NULL)
    {
      val = mrealloc (md, ptr, size);
    }
  else
    {
      val = mmalloc (md, size);
    }
  if (val == NULL)
    {
      nomem (size);
    }
  return (val);
}

/* Like malloc but get error if no storage available, and protect against
   the caller wanting to allocate zero bytes.  */

PTR
xmalloc (size)
     long size;
{
  return (xmmalloc ((PTR) NULL, size));
}

/* Like mrealloc but get error if no storage available.  */

PTR
xrealloc (ptr, size)
     PTR ptr;
     long size;
{
  return (xmrealloc ((PTR) NULL, ptr, size));
}

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

int
myread (desc, addr, len)
     int desc;
     char *addr;
     int len;
{
  register 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 (ptr, size)
     const char *ptr;
     int size;
{
  register char *p = (char *) xmalloc (size + 1);
  memcpy (p, ptr, size);
  p[size] = 0;
  return p;
}

char *
msavestring (md, ptr, size)
     PTR md;
     const char *ptr;
     int size;
{
  register char *p = (char *) xmmalloc (md, size + 1);
  memcpy (p, ptr, size);
  p[size] = 0;
  return p;
}

/* The "const" is so it compiles under DGUX (which prototypes strsave
   in <string.h>.  FIXME: This should be named "xstrsave", shouldn't it?
   Doesn't real strsave return NULL if out of memory?  */
char *
strsave (ptr)
     const char *ptr;
{
  return savestring (ptr, strlen (ptr));
}

char *
mstrsave (md, ptr)
     PTR md;
     const char *ptr;
{
  return (msavestring (md, ptr, strlen (ptr)));
}

void
print_spaces (n, file)
     register int n;
     register FILE *file;
{
  while (n-- > 0)
    fputc (' ', file);
}

/* Print a host address.  */

void
gdb_print_address (addr, stream)
     PTR addr;
     GDB_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);
}

/* 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.  */

/* VARARGS */
int
query (va_alist)
     va_dcl
{
  va_list args;
  char *ctlstr;
  register int answer;
  register int ans2;
  int retval;

  if (query_hook)
    {
      va_start (args);
      return query_hook (args);
    }

  /* Automatically answer "yes" if input is not from a terminal.  */
  if (!input_from_terminal_p ())
    return 1;
#ifdef MPW
  /* FIXME Automatically answer "yes" if called from MacGDB.  */
  if (mac_app)
    return 1;
#endif /* MPW */

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

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

      va_start (args);
      ctlstr = va_arg (args, char *);
      vfprintf_filtered (gdb_stdout, ctlstr, args);
      va_end (args);
      printf_filtered ("(y or n) ");

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

#ifdef MPW
      /* If not in MacGDB, move to a new line so the entered line doesn't
	 have a prompt on the front of it. */
      if (!mac_app)
	fputs_unfiltered ("\n", gdb_stdout);
#endif /* MPW */

      gdb_flush (gdb_stdout);
      answer = fgetc (stdin);
      clearerr (stdin);		/* in case of C-d */
      if (answer == EOF)	/* C-d */
        {
	  retval = 1;
	  break;
	}
      if (answer != '\n')	/* Eat rest of input line, to EOF or newline */
	do 
	  {
	    ans2 = fgetc (stdin);
	    clearerr (stdin);
	  }
        while (ans2 != EOF && ans2 != '\n');
      if (answer >= 'a')
	answer -= 040;
      if (answer == 'Y')
	{
	  retval = 1;
	  break;
	}
      if (answer == 'N')
	{
	  retval = 0;
	  break;
	}
      printf_filtered ("Please answer y or n.\n");
    }

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


/* 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 (string_ptr)
     char **string_ptr;
{
  register int c = *(*string_ptr)++;
  switch (c)
    {
    case 'a':
      return 007;		/* Bell (alert) char */
    case 'b':
      return '\b';
    case 'e':			/* Escape character */
      return 033;
    case 'f':
      return '\f';
    case 'n':
      return '\n';
    case 'r':
      return '\r';
    case 't':
      return '\t';
    case 'v':
      return '\v';
    case '\n':
      return -2;
    case 0:
      (*string_ptr)--;
      return 0;
    case '^':
      c = *(*string_ptr)++;
      if (c == '\\')
	c = parse_escape (string_ptr);
      if (c == '?')
	return 0177;
      return (c & 0200) | (c & 037);
      
    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
      {
	register int i = c - '0';
	register int count = 0;
	while (++count < 3)
	  {
	    if ((c = *(*string_ptr)++) >= '0' && c <= '7')
	      {
		i *= 8;
		i += c - '0';
	      }
	    else
	      {
		(*string_ptr)--;
		break;
	      }
	  }
	return i;
      }
    default:
      return c;
    }
}

/* 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. */

void
gdb_printchar (c, stream, quoter)
     register int c;
     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':
	fputs_filtered ("\\n", stream);
	break;
      case '\b':
	fputs_filtered ("\\b", stream);
	break;
      case '\t':
	fputs_filtered ("\\t", stream);
	break;
      case '\f':
	fputs_filtered ("\\f", stream);
	break;
      case '\r':
	fputs_filtered ("\\r", stream);
	break;
      case '\033':
	fputs_filtered ("\\e", stream);
	break;
      case '\007':
	fputs_filtered ("\\a", stream);
	break;
      default:
	fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
	break;
      }
  } else {
    if (c == '\\' || c == quoter)
      fputs_filtered ("\\", stream);
    fprintf_filtered (stream, "%c", c);
  }
}

/* Number of lines per page or UINT_MAX if paging is disabled.  */
static unsigned int lines_per_page;
/* Number of chars per line or UNIT_MAX is line folding is disabled.  */
static unsigned int chars_per_line;
/* 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;

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

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

static void
prompt_for_continue ()
{
  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 = readline (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')
	request_quit (SIGINT);
      free (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 ()
{
  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(indent)
     char *indent;
{
  /* This should have been allocated, but be paranoid anyway. */
  if (!wrap_buffer)
    abort ();

  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;
    }
}

/* 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 ()
{
  if (chars_printed > 0)
    {
      puts_filtered ("\n");
    }
}


GDB_FILE *
gdb_fopen (name, mode)
     char * name;
     char * mode;
{
  return fopen (name, mode);
}

void
gdb_flush (stream)
     FILE *stream;
{
  if (flush_hook)
    {
      flush_hook (stream);
      return;
    }

  fflush (stream);
}

/* 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 (linebuffer, stream, filter)
     const char *linebuffer;
     FILE *stream;
     int filter;
{
  const char *lineptr;

  if (linebuffer == 0)
    return;

  /* Don't do any filtering if it is disabled.  */
  if (stream != gdb_stdout
   || (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 (linebuffer, stream)
     const char *linebuffer;
     FILE *stream;
{
  fputs_maybe_filtered (linebuffer, stream, 1);
}

int
putchar_unfiltered (c)
     int c;
{
  char buf[2];

  buf[0] = c;
  buf[1] = 0;
  fputs_unfiltered (buf, gdb_stdout);
  return c;
}

int
fputc_unfiltered (c, stream)
     int c;
     FILE * stream;
{
  char buf[2];

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


/* 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 (stream, format, args, filter)
     FILE *stream;
     char *format;
     va_list args;
     int filter;
{
  char *linebuffer;
  struct cleanup *old_cleanups;

  vasprintf (&linebuffer, format, args);
  if (linebuffer == NULL)
    {
      fputs_unfiltered ("\ngdb: virtual memory exhausted.\n", gdb_stderr);
      exit (1);
    }
  old_cleanups = make_cleanup (free, linebuffer);
  fputs_maybe_filtered (linebuffer, stream, filter);
  do_cleanups (old_cleanups);
}


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

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

  vasprintf (&linebuffer, format, args);
  if (linebuffer == NULL)
    {
      fputs_unfiltered ("\ngdb: virtual memory exhausted.\n", gdb_stderr);
      exit (1);
    }
  old_cleanups = make_cleanup (free, linebuffer);
  fputs_unfiltered (linebuffer, stream);
  do_cleanups (old_cleanups);
}

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

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

/* VARARGS */
void
fprintf_filtered (va_alist)
     va_dcl
{
  va_list args;
  FILE *stream;
  char *format;

  va_start (args);
  stream = va_arg (args, FILE *);
  format = va_arg (args, char *);

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

/* VARARGS */
void
fprintf_unfiltered (va_alist)
     va_dcl
{
  va_list args;
  FILE *stream;
  char *format;

  va_start (args);
  stream = va_arg (args, FILE *);
  format = va_arg (args, char *);

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

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

/* VARARGS */
void
fprintfi_filtered (va_alist)
     va_dcl
{
  va_list args;
  int spaces;
  FILE *stream;
  char *format;

  va_start (args);
  spaces = va_arg (args, int);
  stream = va_arg (args, FILE *);
  format = va_arg (args, char *);
  print_spaces_filtered (spaces, stream);

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


/* VARARGS */
void
printf_filtered (va_alist)
     va_dcl
{
  va_list args;
  char *format;

  va_start (args);
  format = va_arg (args, char *);

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


/* VARARGS */
void
printf_unfiltered (va_alist)
     va_dcl
{
  va_list args;
  char *format;

  va_start (args);
  format = va_arg (args, char *);

  vfprintf_unfiltered (gdb_stdout, format, args);
  va_end (args);
}

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

/* VARARGS */
void
printfi_filtered (va_alist)
     va_dcl
{
  va_list args;
  int spaces;
  char *format;

  va_start (args);
  spaces = va_arg (args, int);
  format = va_arg (args, char *);
  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 (string)
     char *string;
{
  fputs_filtered (string, gdb_stdout);
}

void
puts_unfiltered (string)
     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 (n)
     int n;
{
  register char *t;
  static char *spaces;
  static int max_spaces;

  if (n > max_spaces)
    {
      if (spaces)
	free (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 (n, stream)
     int n;
     FILE *stream;
{
  fputs_filtered (n_spaces (n), stream);
}

/* C++ 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 (stream, name, lang, arg_mode)
     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
	{
	  switch (lang)
	    {
	    case language_cplus:
	      demangled = cplus_demangle (name, arg_mode);
	      break;
	    case language_chill:
	      demangled = chill_demangle (name);
	      break;
	    default:
	      demangled = NULL;
	      break;
	    }
	  fputs_filtered (demangled ? demangled : name, stream);
	  if (demangled != NULL)
	    {
	      free (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 (string1, string2)
     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');
}


void
initialize_utils ()
{
  struct cmd_list_element *c;

  c = add_set_cmd ("width", class_support, var_uinteger, 
		  (char *)&chars_per_line,
		  "Set number of characters gdb thinks are in a line.",
		  &setlist);
  add_show_from_set (c, &showlist);
  c->function.sfunc = set_width_command;

  add_show_from_set
    (add_set_cmd ("height", class_support,
		  var_uinteger, (char *)&lines_per_page,
		  "Set number of lines gdb thinks are in a page.", &setlist),
     &showlist);
  
  /* These defaults will be used if we are unable to get the correct
     values from termcap.  */
#if defined(__GO32__) || defined(WIN32)
  lines_per_page = ScreenRows();
  chars_per_line = ScreenCols();
#else  
  lines_per_page = 24;
  chars_per_line = 80;

#ifndef MPW
  /* No termcap under MPW, although might be cool to do something
     by looking at worksheet or console window sizes. */
  /* Initialize the screen height and width from termcap.  */
  {
    char *termtype = getenv ("TERM");

    /* Positive means success, nonpositive means failure.  */
    int status;

    /* 2048 is large enough for all known terminals, according to the
       GNU termcap manual.  */
    char term_buffer[2048];

    if (termtype)
      {
	status = tgetent (term_buffer, termtype);
	if (status > 0)
	  {
	    int val;
	    
	    val = tgetnum ("li");
	    if (val >= 0)
	      lines_per_page = val;
	    else
	      /* 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;
	    
	    val = tgetnum ("co");
	    if (val >= 0)
	      chars_per_line = val;
	  }
      }
  }
#endif /* MPW */

#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)

  /* If there is a better way to determine the window size, use it. */
  SIGWINCH_HANDLER ();
#endif
#endif
  /* If the output is not a terminal, don't paginate it.  */
  if (!ISATTY (gdb_stdout))
    lines_per_page = UINT_MAX;

  set_width_command ((char *)NULL, 0, c);

  add_show_from_set
    (add_set_cmd ("demangle", class_support, var_boolean, 
		  (char *)&demangle,
		"Set demangling of encoded C++ names when displaying symbols.",
		  &setprintlist),
     &showprintlist);

  add_show_from_set
    (add_set_cmd ("sevenbit-strings", class_support, var_boolean, 
		  (char *)&sevenbit_strings,
   "Set printing of 8-bit characters in strings as \\nnn.",
		  &setprintlist),
     &showprintlist);

  add_show_from_set
    (add_set_cmd ("asm-demangle", class_support, var_boolean, 
		  (char *)&asm_demangle,
	"Set demangling of C++ names in disassembly listings.",
		  &setprintlist),
     &showprintlist);
}

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

#ifdef  SIGWINCH_HANDLER_BODY
        SIGWINCH_HANDLER_BODY
#endif