262 lines
7.2 KiB
C
262 lines
7.2 KiB
C
/* Convert multibyte character to wide character.
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Copyright (C) 1999-2002, 2005-2023 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2008. */
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/* This file contains the body of the mbrtowc and mbrtoc32 functions,
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when GNULIB_defined_mbstate_t is defined. */
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char *pstate = (char *)ps;
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if (s == NULL)
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{
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pwc = NULL;
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s = "";
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n = 1;
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}
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if (n == 0)
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return (size_t)(-2);
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/* Here n > 0. */
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if (pstate == NULL)
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pstate = internal_state;
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{
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size_t nstate = pstate[0];
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char buf[4];
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const char *p;
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size_t m;
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enc_t enc;
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int res;
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switch (nstate)
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{
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case 0:
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p = s;
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m = n;
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break;
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case 3:
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buf[2] = pstate[3];
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FALLTHROUGH;
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case 2:
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buf[1] = pstate[2];
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FALLTHROUGH;
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case 1:
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buf[0] = pstate[1];
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p = buf;
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m = nstate;
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buf[m++] = s[0];
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if (n >= 2 && m < 4)
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{
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buf[m++] = s[1];
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if (n >= 3 && m < 4)
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buf[m++] = s[2];
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}
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break;
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default:
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errno = EINVAL;
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return (size_t)(-1);
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}
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/* Here m > 0. */
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enc = locale_encoding_classification ();
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if (enc == enc_utf8) /* UTF-8 */
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{
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/* Achieve
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- multi-thread safety and
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- the ability to produce wide character values > WCHAR_MAX
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by not calling mbtowc() at all. */
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#include "mbrtowc-impl-utf8.h"
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}
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else
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{
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/* The hidden internal state of mbtowc would make this function not
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multi-thread safe. Achieve multi-thread safety through a lock. */
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wchar_t wc;
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res = mbtowc_with_lock (&wc, p, m);
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if (res >= 0)
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{
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if ((wc == 0) != (res == 0))
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abort ();
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if (pwc != NULL)
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*pwc = wc;
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goto success;
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}
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/* mbtowc does not distinguish between invalid and incomplete multibyte
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sequences. But mbrtowc needs to make this distinction.
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There are two possible approaches:
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- Use iconv() and its return value.
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- Use built-in knowledge about the possible encodings.
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Given the low quality of implementation of iconv() on the systems
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that lack mbrtowc(), we use the second approach.
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The possible encodings are:
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- 8-bit encodings,
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- EUC-JP, EUC-KR, GB2312, EUC-TW, BIG5, GB18030, SJIS,
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- UTF-8 (already handled above).
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Use specialized code for each. */
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if (m >= 4 || m >= MB_CUR_MAX)
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goto invalid;
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/* Here MB_CUR_MAX > 1 and 0 < m < 4. */
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switch (enc)
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{
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/* As a reference for this code, you can use the GNU libiconv
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implementation. Look for uses of the RET_TOOFEW macro. */
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case enc_eucjp: /* EUC-JP */
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{
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if (m == 1)
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{
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unsigned char c = (unsigned char) p[0];
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if ((c >= 0xa1 && c < 0xff) || c == 0x8e || c == 0x8f)
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goto incomplete;
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}
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if (m == 2)
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{
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unsigned char c = (unsigned char) p[0];
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if (c == 0x8f)
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{
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unsigned char c2 = (unsigned char) p[1];
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if (c2 >= 0xa1 && c2 < 0xff)
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goto incomplete;
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}
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}
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goto invalid;
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}
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case enc_94: /* EUC-KR, GB2312, BIG5 */
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{
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if (m == 1)
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{
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unsigned char c = (unsigned char) p[0];
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if (c >= 0xa1 && c < 0xff)
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goto incomplete;
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}
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goto invalid;
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}
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case enc_euctw: /* EUC-TW */
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{
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if (m == 1)
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{
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unsigned char c = (unsigned char) p[0];
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if ((c >= 0xa1 && c < 0xff) || c == 0x8e)
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goto incomplete;
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}
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else /* m == 2 || m == 3 */
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{
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unsigned char c = (unsigned char) p[0];
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if (c == 0x8e)
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goto incomplete;
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}
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goto invalid;
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}
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case enc_gb18030: /* GB18030 */
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{
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if (m == 1)
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{
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unsigned char c = (unsigned char) p[0];
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if ((c >= 0x90 && c <= 0xe3) || (c >= 0xf8 && c <= 0xfe))
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goto incomplete;
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}
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else /* m == 2 || m == 3 */
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{
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unsigned char c = (unsigned char) p[0];
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if (c >= 0x90 && c <= 0xe3)
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{
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unsigned char c2 = (unsigned char) p[1];
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if (c2 >= 0x30 && c2 <= 0x39)
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{
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if (m == 2)
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goto incomplete;
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else /* m == 3 */
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{
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unsigned char c3 = (unsigned char) p[2];
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if (c3 >= 0x81 && c3 <= 0xfe)
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goto incomplete;
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}
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}
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}
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}
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goto invalid;
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}
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case enc_sjis: /* SJIS */
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{
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if (m == 1)
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{
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unsigned char c = (unsigned char) p[0];
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if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xea)
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|| (c >= 0xf0 && c <= 0xf9))
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goto incomplete;
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}
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goto invalid;
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}
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default:
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/* An unknown multibyte encoding. */
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goto incomplete;
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}
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}
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success:
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/* res >= 0 is the corrected return value of
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mbtowc_with_lock (&wc, p, m). */
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if (nstate >= (res > 0 ? res : 1))
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abort ();
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res -= nstate;
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pstate[0] = 0;
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return res;
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incomplete:
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{
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size_t k = nstate;
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/* Here 0 <= k < m < 4. */
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pstate[++k] = s[0];
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if (k < m)
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{
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pstate[++k] = s[1];
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if (k < m)
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pstate[++k] = s[2];
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}
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if (k != m)
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abort ();
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}
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pstate[0] = m;
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return (size_t)(-2);
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invalid:
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errno = EILSEQ;
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/* The conversion state is undefined, says POSIX. */
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return (size_t)(-1);
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}
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