aboutsummaryrefslogtreecommitdiff
path: root/readline/mbutil.c
blob: 50302f01badb11c060663c7aa9de80a8501c3955 (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
/* mbutil.c -- readline multibyte character utility functions */

/* Copyright (C) 2001 Free Software Foundation, Inc.

   This file is part of the GNU Readline Library, a library for
   reading lines of text with interactive input and history editing.

   The GNU Readline Library 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, or
   (at your option) any later version.

   The GNU Readline Library 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.

   The GNU General Public License is often shipped with GNU software, and
   is generally kept in a file called COPYING or LICENSE.  If you do not
   have a copy of the license, write to the Free Software Foundation,
   59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#define READLINE_LIBRARY

#if defined (HAVE_CONFIG_H)
#  include <config.h>
#endif

#include <sys/types.h>
#include <fcntl.h>
#include "posixjmp.h"

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>	   /* for _POSIX_VERSION */
#endif /* HAVE_UNISTD_H */

#if defined (HAVE_STDLIB_H)
#  include <stdlib.h>
#else
#  include "ansi_stdlib.h"
#endif /* HAVE_STDLIB_H */

#include <stdio.h>
#include <ctype.h>

/* System-specific feature definitions and include files. */
#include "rldefs.h"
#include "rlmbutil.h"

#if defined (TIOCSTAT_IN_SYS_IOCTL)
#  include <sys/ioctl.h>
#endif /* TIOCSTAT_IN_SYS_IOCTL */

/* Some standard library routines. */
#include "readline.h"

#include "rlprivate.h"
#include "xmalloc.h"

/* Declared here so it can be shared between the readline and history
   libraries. */
#if defined (HANDLE_MULTIBYTE)
int rl_byte_oriented = 0;
#else
int rl_byte_oriented = 1;
#endif

/* **************************************************************** */
/*								    */
/*		Multibyte Character Utility Functions		    */
/*								    */
/* **************************************************************** */

#if defined(HANDLE_MULTIBYTE)

static int
_rl_find_next_mbchar_internal (string, seed, count, find_non_zero)
     char *string;
     int seed, count, find_non_zero;
{
  size_t tmp = 0;
  mbstate_t ps;
  int point = 0;
  wchar_t wc;

  memset(&ps, 0, sizeof (mbstate_t));
  if (seed < 0)
    seed = 0;
  if (count <= 0)
    return seed;

  point = seed + _rl_adjust_point(string, seed, &ps);
  /* if this is true, means that seed was not pointed character
     started byte.  So correct the point and consume count */
  if (seed < point)
    count --;

  while (count > 0)  
    {
      tmp = mbrtowc (&wc, string+point, strlen(string + point), &ps);
      if ((size_t)(tmp) == (size_t)-1 || (size_t)(tmp) == (size_t)-2)
	{
	  /* invalid bytes. asume a byte represents a character */
	  point++;
	  count--;
	  /* reset states. */
	  memset(&ps, 0, sizeof(mbstate_t));
	}
      else if (tmp == (size_t)0)
	/* found '\0' char */
	break;
      else
	{
	  /* valid bytes */
	  point += tmp;
	  if (find_non_zero)
	    {
	      if (wcwidth (wc) == 0)
		continue;
	      else
		count--;
	    }
	  else
	    count--;
	}
    }

  if (find_non_zero)
    {
      tmp = mbrtowc (&wc, string + point, strlen (string + point), &ps);
      while (wcwidth (wc) == 0)
	{
	  point += tmp;
	  tmp = mbrtowc (&wc, string + point, strlen (string + point), &ps);
	  if (tmp == (size_t)(0) || tmp == (size_t)(-1) || tmp == (size_t)(-2))
	    break;
	}
    }
    return point;
}

static int
_rl_find_prev_mbchar_internal (string, seed, find_non_zero)
     char *string;
     int seed, find_non_zero;
{
  mbstate_t ps;
  int prev, non_zero_prev, point, length;
  size_t tmp;
  wchar_t wc;

  memset(&ps, 0, sizeof(mbstate_t));
  length = strlen(string);
  
  if (seed < 0)
    return 0;
  else if (length < seed)
    return length;

  prev = non_zero_prev = point = 0;
  while (point < seed)
    {
      tmp = mbrtowc (&wc, string + point, length - point, &ps);
      if ((size_t)(tmp) == (size_t)-1 || (size_t)(tmp) == (size_t)-2)
	{
	  /* in this case, bytes are invalid or shorted to compose
	     multibyte char, so assume that the first byte represents
	     a single character anyway. */
	  tmp = 1;
	  /* clear the state of the byte sequence, because
	     in this case effect of mbstate is undefined  */
	  memset(&ps, 0, sizeof (mbstate_t));
	}
      else if (tmp == 0)
	break;			/* Found '\0' char.  Can this happen? */
      else
	{
	  if (find_non_zero)
	    {
	      if (wcwidth (wc) != 0)
		prev = point;
	    }
	  else
	    prev = point;  
	}

      point += tmp;
    }

  return prev;
}

/* return the number of bytes parsed from the multibyte sequence starting
   at src, if a non-L'\0' wide character was recognized. It returns 0, 
   if a L'\0' wide character was recognized. It  returns (size_t)(-1), 
   if an invalid multibyte sequence was encountered. It returns (size_t)(-2) 
   if it couldn't parse a complete  multibyte character.  */
int
_rl_get_char_len (src, ps)
     char *src;
     mbstate_t *ps;
{
  size_t tmp;

  tmp = mbrlen((const char *)src, (size_t)strlen (src), ps);
  if (tmp == (size_t)(-2))
    {
      /* shorted to compose multibyte char */
      memset (ps, 0, sizeof(mbstate_t));
      return -2;
    }
  else if (tmp == (size_t)(-1))
    {
      /* invalid to compose multibyte char */
      /* initialize the conversion state */
      memset (ps, 0, sizeof(mbstate_t));
      return -1;
    }
  else if (tmp == (size_t)0)
    return 0;
  else
    return (int)tmp;
}

/* compare the specified two characters. If the characters matched,
   return 1. Otherwise return 0. */
int
_rl_compare_chars (buf1, pos1, ps1, buf2, pos2, ps2)
     char *buf1, *buf2;
     mbstate_t *ps1, *ps2;
     int pos1, pos2;
{
  int i, w1, w2;

  if ((w1 = _rl_get_char_len (&buf1[pos1], ps1)) <= 0 || 
	(w2 = _rl_get_char_len (&buf2[pos2], ps2)) <= 0 ||
	(w1 != w2) ||
	(buf1[pos1] != buf2[pos2]))
    return 0;

  for (i = 1; i < w1; i++)
    if (buf1[pos1+i] != buf2[pos2+i])
      return 0;

  return 1;
}

/* adjust pointed byte and find mbstate of the point of string.
   adjusted point will be point <= adjusted_point, and returns
   differences of the byte(adjusted_point - point).
   if point is invalied (point < 0 || more than string length),
   it returns -1 */
int
_rl_adjust_point(string, point, ps)
     char *string;
     int point;
     mbstate_t *ps;
{
  size_t tmp = 0;
  int length;
  int pos = 0;

  length = strlen(string);
  if (point < 0)
    return -1;
  if (length < point)
    return -1;
  
  while (pos < point)
    {
      tmp = mbrlen (string + pos, length - pos, ps);
      if((size_t)(tmp) == (size_t)-1 || (size_t)(tmp) == (size_t)-2)
	{
	  /* in this case, bytes are invalid or shorted to compose
	     multibyte char, so assume that the first byte represents
	     a single character anyway. */
	  pos++;
	  /* clear the state of the byte sequence, because
	     in this case effect of mbstate is undefined  */
	  memset (ps, 0, sizeof (mbstate_t));
	}
      else
	pos += tmp;
    }

  return (pos - point);
}

int
_rl_is_mbchar_matched (string, seed, end, mbchar, length)
     char *string;
     int seed, end;
     char *mbchar;
     int length;
{
  int i;

  if ((end - seed) < length)
    return 0;

  for (i = 0; i < length; i++)
    if (string[seed + i] != mbchar[i])
      return 0;
  return 1;
}
#endif /* HANDLE_MULTIBYTE */

/* Find next `count' characters started byte point of the specified seed.
   If flags is MB_FIND_NONZERO, we look for non-zero-width multibyte
   characters. */
#undef _rl_find_next_mbchar
int
_rl_find_next_mbchar (string, seed, count, flags)
     char *string;
     int seed, count, flags;
{
#if defined (HANDLE_MULTIBYTE)
  return _rl_find_next_mbchar_internal (string, seed, count, flags);
#else
  return (seed + count);
#endif
}

/* Find previous character started byte point of the specified seed.
   Returned point will be point <= seed.  If flags is MB_FIND_NONZERO,
   we look for non-zero-width multibyte characters. */
#undef _rl_find_prev_mbchar
int
_rl_find_prev_mbchar (string, seed, flags)
     char *string;
     int seed, flags;
{
#if defined (HANDLE_MULTIBYTE)
  return _rl_find_prev_mbchar_internal (string, seed, flags);
#else
  return ((seed == 0) ? seed : seed - 1);
#endif
}