1 /* mbutil.c -- readline multibyte character utility functions */
3 /* Copyright (C) 2001-2009 Free Software Foundation, Inc.
5 This file is part of the GNU Readline Library (Readline), a library
6 for reading lines of text with interactive input and history editing.
8 Readline is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 Readline is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with Readline. If not, see <http://www.gnu.org/licenses/>.
22 #define READLINE_LIBRARY
24 #if defined (HAVE_CONFIG_H)
28 #include <sys/types.h>
32 #if defined (HAVE_UNISTD_H)
33 # include <unistd.h> /* for _POSIX_VERSION */
34 #endif /* HAVE_UNISTD_H */
36 #if defined (HAVE_STDLIB_H)
39 # include "ansi_stdlib.h"
40 #endif /* HAVE_STDLIB_H */
45 /* System-specific feature definitions and include files. */
49 #if defined (TIOCSTAT_IN_SYS_IOCTL)
50 # include <sys/ioctl.h>
51 #endif /* TIOCSTAT_IN_SYS_IOCTL */
53 /* Some standard library routines. */
56 #include "rlprivate.h"
59 /* Declared here so it can be shared between the readline and history
61 #if defined (HANDLE_MULTIBYTE)
62 int rl_byte_oriented
= 0;
64 int rl_byte_oriented
= 1;
67 /* **************************************************************** */
69 /* Multibyte Character Utility Functions */
71 /* **************************************************************** */
73 #if defined(HANDLE_MULTIBYTE)
76 _rl_find_next_mbchar_internal (string
, seed
, count
, find_non_zero
)
78 int seed
, count
, find_non_zero
;
87 memset(&ps
, 0, sizeof (mbstate_t));
93 point
= seed
+ _rl_adjust_point (string
, seed
, &ps
);
94 /* if this is true, means that seed was not pointing to a byte indicating
95 the beginning of a multibyte character. Correct the point and consume
102 len
= strlen (string
+ point
);
105 tmp
= mbrtowc (&wc
, string
+point
, len
, &ps
);
106 if (MB_INVALIDCH ((size_t)tmp
))
108 /* invalid bytes. assume a byte represents a character */
112 memset(&ps
, 0, sizeof(mbstate_t));
114 else if (MB_NULLWCH (tmp
))
115 break; /* found wide '\0' */
122 if (wcwidth (wc
) == 0)
134 tmp
= mbrtowc (&wc
, string
+ point
, strlen (string
+ point
), &ps
);
135 while (MB_NULLWCH (tmp
) == 0 && MB_INVALIDCH (tmp
) == 0 && wcwidth (wc
) == 0)
138 tmp
= mbrtowc (&wc
, string
+ point
, strlen (string
+ point
), &ps
);
146 _rl_find_prev_mbchar_internal (string
, seed
, find_non_zero
)
148 int seed
, find_non_zero
;
151 int prev
, non_zero_prev
, point
, length
;
155 memset(&ps
, 0, sizeof(mbstate_t));
156 length
= strlen(string
);
160 else if (length
< seed
)
163 prev
= non_zero_prev
= point
= 0;
166 tmp
= mbrtowc (&wc
, string
+ point
, length
- point
, &ps
);
167 if (MB_INVALIDCH ((size_t)tmp
))
169 /* in this case, bytes are invalid or shorted to compose
170 multibyte char, so assume that the first byte represents
171 a single character anyway. */
173 /* clear the state of the byte sequence, because
174 in this case effect of mbstate is undefined */
175 memset(&ps
, 0, sizeof (mbstate_t));
177 /* Since we're assuming that this byte represents a single
178 non-zero-width character, don't forget about it. */
181 else if (MB_NULLWCH (tmp
))
182 break; /* Found '\0' char. Can this happen? */
187 if (wcwidth (wc
) != 0)
200 /* return the number of bytes parsed from the multibyte sequence starting
201 at src, if a non-L'\0' wide character was recognized. It returns 0,
202 if a L'\0' wide character was recognized. It returns (size_t)(-1),
203 if an invalid multibyte sequence was encountered. It returns (size_t)(-2)
204 if it couldn't parse a complete multibyte character. */
206 _rl_get_char_len (src
, ps
)
212 tmp
= mbrlen((const char *)src
, (size_t)strlen (src
), ps
);
213 if (tmp
== (size_t)(-2))
215 /* shorted to compose multibyte char */
217 memset (ps
, 0, sizeof(mbstate_t));
220 else if (tmp
== (size_t)(-1))
222 /* invalid to compose multibyte char */
223 /* initialize the conversion state */
225 memset (ps
, 0, sizeof(mbstate_t));
228 else if (tmp
== (size_t)0)
234 /* compare the specified two characters. If the characters matched,
235 return 1. Otherwise return 0. */
237 _rl_compare_chars (buf1
, pos1
, ps1
, buf2
, pos2
, ps2
)
247 if ((w1
= _rl_get_char_len (&buf1
[pos1
], ps1
)) <= 0 ||
248 (w2
= _rl_get_char_len (&buf2
[pos2
], ps2
)) <= 0 ||
250 (buf1
[pos1
] != buf2
[pos2
]))
253 for (i
= 1; i
< w1
; i
++)
254 if (buf1
[pos1
+i
] != buf2
[pos2
+i
])
260 /* adjust pointed byte and find mbstate of the point of string.
261 adjusted point will be point <= adjusted_point, and returns
262 differences of the byte(adjusted_point - point).
263 if point is invalied (point < 0 || more than string length),
266 _rl_adjust_point(string
, point
, ps
)
275 length
= strlen(string
);
283 tmp
= mbrlen (string
+ pos
, length
- pos
, ps
);
284 if (MB_INVALIDCH ((size_t)tmp
))
286 /* in this case, bytes are invalid or shorted to compose
287 multibyte char, so assume that the first byte represents
288 a single character anyway. */
290 /* clear the state of the byte sequence, because
291 in this case effect of mbstate is undefined */
293 memset (ps
, 0, sizeof (mbstate_t));
295 else if (MB_NULLWCH (tmp
))
301 return (pos
- point
);
305 _rl_is_mbchar_matched (string
, seed
, end
, mbchar
, length
)
313 if ((end
- seed
) < length
)
316 for (i
= 0; i
< length
; i
++)
317 if (string
[seed
+ i
] != mbchar
[i
])
323 _rl_char_value (buf
, ind
)
332 if (MB_LEN_MAX
== 1 || rl_byte_oriented
)
333 return ((wchar_t) buf
[ind
]);
336 return ((wchar_t) buf
[ind
]);
337 memset (&ps
, 0, sizeof (mbstate_t));
338 tmp
= mbrtowc (&wc
, buf
+ ind
, l
- ind
, &ps
);
339 if (MB_INVALIDCH (tmp
) || MB_NULLWCH (tmp
))
340 return ((wchar_t) buf
[ind
]);
343 #endif /* HANDLE_MULTIBYTE */
345 /* Find next `count' characters started byte point of the specified seed.
346 If flags is MB_FIND_NONZERO, we look for non-zero-width multibyte
348 #undef _rl_find_next_mbchar
350 _rl_find_next_mbchar (string
, seed
, count
, flags
)
352 int seed
, count
, flags
;
354 #if defined (HANDLE_MULTIBYTE)
355 return _rl_find_next_mbchar_internal (string
, seed
, count
, flags
);
357 return (seed
+ count
);
361 /* Find previous character started byte point of the specified seed.
362 Returned point will be point <= seed. If flags is MB_FIND_NONZERO,
363 we look for non-zero-width multibyte characters. */
364 #undef _rl_find_prev_mbchar
366 _rl_find_prev_mbchar (string
, seed
, flags
)
370 #if defined (HANDLE_MULTIBYTE)
371 return _rl_find_prev_mbchar_internal (string
, seed
, flags
);
373 return ((seed
== 0) ? seed
: seed
- 1);
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