Annotation of embedaddon/readline/mbutil.c, revision 1.1
1.1 ! misho 1: /* mbutil.c -- readline multibyte character utility functions */
! 2:
! 3: /* Copyright (C) 2001-2009 Free Software Foundation, Inc.
! 4:
! 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.
! 7:
! 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.
! 12:
! 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.
! 17:
! 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/>.
! 20: */
! 21:
! 22: #define READLINE_LIBRARY
! 23:
! 24: #if defined (HAVE_CONFIG_H)
! 25: # include <config.h>
! 26: #endif
! 27:
! 28: #include <sys/types.h>
! 29: #include <fcntl.h>
! 30: #include "posixjmp.h"
! 31:
! 32: #if defined (HAVE_UNISTD_H)
! 33: # include <unistd.h> /* for _POSIX_VERSION */
! 34: #endif /* HAVE_UNISTD_H */
! 35:
! 36: #if defined (HAVE_STDLIB_H)
! 37: # include <stdlib.h>
! 38: #else
! 39: # include "ansi_stdlib.h"
! 40: #endif /* HAVE_STDLIB_H */
! 41:
! 42: #include <stdio.h>
! 43: #include <ctype.h>
! 44:
! 45: /* System-specific feature definitions and include files. */
! 46: #include "rldefs.h"
! 47: #include "rlmbutil.h"
! 48:
! 49: #if defined (TIOCSTAT_IN_SYS_IOCTL)
! 50: # include <sys/ioctl.h>
! 51: #endif /* TIOCSTAT_IN_SYS_IOCTL */
! 52:
! 53: /* Some standard library routines. */
! 54: #include "readline.h"
! 55:
! 56: #include "rlprivate.h"
! 57: #include "xmalloc.h"
! 58:
! 59: /* Declared here so it can be shared between the readline and history
! 60: libraries. */
! 61: #if defined (HANDLE_MULTIBYTE)
! 62: int rl_byte_oriented = 0;
! 63: #else
! 64: int rl_byte_oriented = 1;
! 65: #endif
! 66:
! 67: /* Ditto */
! 68: int _rl_utf8locale = 0;
! 69:
! 70: /* **************************************************************** */
! 71: /* */
! 72: /* Multibyte Character Utility Functions */
! 73: /* */
! 74: /* **************************************************************** */
! 75:
! 76: #if defined(HANDLE_MULTIBYTE)
! 77:
! 78: static int
! 79: _rl_find_next_mbchar_internal (string, seed, count, find_non_zero)
! 80: char *string;
! 81: int seed, count, find_non_zero;
! 82: {
! 83: size_t tmp, len;
! 84: mbstate_t ps;
! 85: int point;
! 86: wchar_t wc;
! 87:
! 88: tmp = 0;
! 89:
! 90: memset(&ps, 0, sizeof (mbstate_t));
! 91: if (seed < 0)
! 92: seed = 0;
! 93: if (count <= 0)
! 94: return seed;
! 95:
! 96: point = seed + _rl_adjust_point (string, seed, &ps);
! 97: /* if this is true, means that seed was not pointing to a byte indicating
! 98: the beginning of a multibyte character. Correct the point and consume
! 99: one char. */
! 100: if (seed < point)
! 101: count--;
! 102:
! 103: while (count > 0)
! 104: {
! 105: len = strlen (string + point);
! 106: if (len == 0)
! 107: break;
! 108: tmp = mbrtowc (&wc, string+point, len, &ps);
! 109: if (MB_INVALIDCH ((size_t)tmp))
! 110: {
! 111: /* invalid bytes. assume a byte represents a character */
! 112: point++;
! 113: count--;
! 114: /* reset states. */
! 115: memset(&ps, 0, sizeof(mbstate_t));
! 116: }
! 117: else if (MB_NULLWCH (tmp))
! 118: break; /* found wide '\0' */
! 119: else
! 120: {
! 121: /* valid bytes */
! 122: point += tmp;
! 123: if (find_non_zero)
! 124: {
! 125: if (WCWIDTH (wc) == 0)
! 126: continue;
! 127: else
! 128: count--;
! 129: }
! 130: else
! 131: count--;
! 132: }
! 133: }
! 134:
! 135: if (find_non_zero)
! 136: {
! 137: tmp = mbrtowc (&wc, string + point, strlen (string + point), &ps);
! 138: while (MB_NULLWCH (tmp) == 0 && MB_INVALIDCH (tmp) == 0 && WCWIDTH (wc) == 0)
! 139: {
! 140: point += tmp;
! 141: tmp = mbrtowc (&wc, string + point, strlen (string + point), &ps);
! 142: }
! 143: }
! 144:
! 145: return point;
! 146: }
! 147:
! 148: static int
! 149: _rl_find_prev_mbchar_internal (string, seed, find_non_zero)
! 150: char *string;
! 151: int seed, find_non_zero;
! 152: {
! 153: mbstate_t ps;
! 154: int prev, non_zero_prev, point, length;
! 155: size_t tmp;
! 156: wchar_t wc;
! 157:
! 158: memset(&ps, 0, sizeof(mbstate_t));
! 159: length = strlen(string);
! 160:
! 161: if (seed < 0)
! 162: return 0;
! 163: else if (length < seed)
! 164: return length;
! 165:
! 166: prev = non_zero_prev = point = 0;
! 167: while (point < seed)
! 168: {
! 169: tmp = mbrtowc (&wc, string + point, length - point, &ps);
! 170: if (MB_INVALIDCH ((size_t)tmp))
! 171: {
! 172: /* in this case, bytes are invalid or shorted to compose
! 173: multibyte char, so assume that the first byte represents
! 174: a single character anyway. */
! 175: tmp = 1;
! 176: /* clear the state of the byte sequence, because
! 177: in this case effect of mbstate is undefined */
! 178: memset(&ps, 0, sizeof (mbstate_t));
! 179:
! 180: /* Since we're assuming that this byte represents a single
! 181: non-zero-width character, don't forget about it. */
! 182: prev = point;
! 183: }
! 184: else if (MB_NULLWCH (tmp))
! 185: break; /* Found '\0' char. Can this happen? */
! 186: else
! 187: {
! 188: if (find_non_zero)
! 189: {
! 190: if (WCWIDTH (wc) != 0)
! 191: prev = point;
! 192: }
! 193: else
! 194: prev = point;
! 195: }
! 196:
! 197: point += tmp;
! 198: }
! 199:
! 200: return prev;
! 201: }
! 202:
! 203: /* return the number of bytes parsed from the multibyte sequence starting
! 204: at src, if a non-L'\0' wide character was recognized. It returns 0,
! 205: if a L'\0' wide character was recognized. It returns (size_t)(-1),
! 206: if an invalid multibyte sequence was encountered. It returns (size_t)(-2)
! 207: if it couldn't parse a complete multibyte character. */
! 208: int
! 209: _rl_get_char_len (src, ps)
! 210: char *src;
! 211: mbstate_t *ps;
! 212: {
! 213: size_t tmp;
! 214:
! 215: tmp = mbrlen((const char *)src, (size_t)strlen (src), ps);
! 216: if (tmp == (size_t)(-2))
! 217: {
! 218: /* shorted to compose multibyte char */
! 219: if (ps)
! 220: memset (ps, 0, sizeof(mbstate_t));
! 221: return -2;
! 222: }
! 223: else if (tmp == (size_t)(-1))
! 224: {
! 225: /* invalid to compose multibyte char */
! 226: /* initialize the conversion state */
! 227: if (ps)
! 228: memset (ps, 0, sizeof(mbstate_t));
! 229: return -1;
! 230: }
! 231: else if (tmp == (size_t)0)
! 232: return 0;
! 233: else
! 234: return (int)tmp;
! 235: }
! 236:
! 237: /* compare the specified two characters. If the characters matched,
! 238: return 1. Otherwise return 0. */
! 239: int
! 240: _rl_compare_chars (buf1, pos1, ps1, buf2, pos2, ps2)
! 241: char *buf1;
! 242: int pos1;
! 243: mbstate_t *ps1;
! 244: char *buf2;
! 245: int pos2;
! 246: mbstate_t *ps2;
! 247: {
! 248: int i, w1, w2;
! 249:
! 250: if ((w1 = _rl_get_char_len (&buf1[pos1], ps1)) <= 0 ||
! 251: (w2 = _rl_get_char_len (&buf2[pos2], ps2)) <= 0 ||
! 252: (w1 != w2) ||
! 253: (buf1[pos1] != buf2[pos2]))
! 254: return 0;
! 255:
! 256: for (i = 1; i < w1; i++)
! 257: if (buf1[pos1+i] != buf2[pos2+i])
! 258: return 0;
! 259:
! 260: return 1;
! 261: }
! 262:
! 263: /* adjust pointed byte and find mbstate of the point of string.
! 264: adjusted point will be point <= adjusted_point, and returns
! 265: differences of the byte(adjusted_point - point).
! 266: if point is invalied (point < 0 || more than string length),
! 267: it returns -1 */
! 268: int
! 269: _rl_adjust_point (string, point, ps)
! 270: char *string;
! 271: int point;
! 272: mbstate_t *ps;
! 273: {
! 274: size_t tmp = 0;
! 275: int length;
! 276: int pos = 0;
! 277:
! 278: length = strlen(string);
! 279: if (point < 0)
! 280: return -1;
! 281: if (length < point)
! 282: return -1;
! 283:
! 284: while (pos < point)
! 285: {
! 286: tmp = mbrlen (string + pos, length - pos, ps);
! 287: if (MB_INVALIDCH ((size_t)tmp))
! 288: {
! 289: /* in this case, bytes are invalid or shorted to compose
! 290: multibyte char, so assume that the first byte represents
! 291: a single character anyway. */
! 292: pos++;
! 293: /* clear the state of the byte sequence, because
! 294: in this case effect of mbstate is undefined */
! 295: if (ps)
! 296: memset (ps, 0, sizeof (mbstate_t));
! 297: }
! 298: else if (MB_NULLWCH (tmp))
! 299: pos++;
! 300: else
! 301: pos += tmp;
! 302: }
! 303:
! 304: return (pos - point);
! 305: }
! 306:
! 307: int
! 308: _rl_is_mbchar_matched (string, seed, end, mbchar, length)
! 309: char *string;
! 310: int seed, end;
! 311: char *mbchar;
! 312: int length;
! 313: {
! 314: int i;
! 315:
! 316: if ((end - seed) < length)
! 317: return 0;
! 318:
! 319: for (i = 0; i < length; i++)
! 320: if (string[seed + i] != mbchar[i])
! 321: return 0;
! 322: return 1;
! 323: }
! 324:
! 325: wchar_t
! 326: _rl_char_value (buf, ind)
! 327: char *buf;
! 328: int ind;
! 329: {
! 330: size_t tmp;
! 331: wchar_t wc;
! 332: mbstate_t ps;
! 333: int l;
! 334:
! 335: if (MB_LEN_MAX == 1 || rl_byte_oriented)
! 336: return ((wchar_t) buf[ind]);
! 337: l = strlen (buf);
! 338: if (ind >= l - 1)
! 339: return ((wchar_t) buf[ind]);
! 340: memset (&ps, 0, sizeof (mbstate_t));
! 341: tmp = mbrtowc (&wc, buf + ind, l - ind, &ps);
! 342: if (MB_INVALIDCH (tmp) || MB_NULLWCH (tmp))
! 343: return ((wchar_t) buf[ind]);
! 344: return wc;
! 345: }
! 346: #endif /* HANDLE_MULTIBYTE */
! 347:
! 348: /* Find next `count' characters started byte point of the specified seed.
! 349: If flags is MB_FIND_NONZERO, we look for non-zero-width multibyte
! 350: characters. */
! 351: #undef _rl_find_next_mbchar
! 352: int
! 353: _rl_find_next_mbchar (string, seed, count, flags)
! 354: char *string;
! 355: int seed, count, flags;
! 356: {
! 357: #if defined (HANDLE_MULTIBYTE)
! 358: return _rl_find_next_mbchar_internal (string, seed, count, flags);
! 359: #else
! 360: return (seed + count);
! 361: #endif
! 362: }
! 363:
! 364: /* Find previous character started byte point of the specified seed.
! 365: Returned point will be point <= seed. If flags is MB_FIND_NONZERO,
! 366: we look for non-zero-width multibyte characters. */
! 367: #undef _rl_find_prev_mbchar
! 368: int
! 369: _rl_find_prev_mbchar (string, seed, flags)
! 370: char *string;
! 371: int seed, flags;
! 372: {
! 373: #if defined (HANDLE_MULTIBYTE)
! 374: return _rl_find_prev_mbchar_internal (string, seed, flags);
! 375: #else
! 376: return ((seed == 0) ? seed : seed - 1);
! 377: #endif
! 378: }
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