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d268b4b964
* lib/mbs_endswith.c (mbs_endswith): * lib/mbs_startswith.c (mbs_startswith): If GNULIB_MCEL_PREFER, prefer the mcel.h API and semantics.
86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/* mbs_endswith function.
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Copyright (C) 2025-2026 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 3 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>, 2025. */
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#include <config.h>
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/* Specification. */
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#include <string.h>
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#if GNULIB_MCEL_PREFER
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# include "mcel.h"
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#else
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# include "mbiter.h"
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#endif
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bool
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mbs_endswith (const char *string, const char *suffix)
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{
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if ((unsigned char) suffix[0] < 0x30)
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/* Some knowledge about the possible multibyte encodings:
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Encoding First byte of character Which of these can occur
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as second or later byte?
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EUC-JP 0x00..0x7F, 0x8E..0xFE 0xA1..0xFE
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EUC-KR 0x00..0x7F, 0xA1..0xFD 0xA1..0xFD
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GB2312 0x00..0x7F, 0xA1..0xF7 0xA1..0xF7
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EUC-TW 0x00..0x7F, 0x8E..0xFD 0xA1..0xFD
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BIG5 0x00..0x7F, 0xA1..0xF9 0x40..0x7E, 0xA1..0xF9
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GB18030 0x00..0x7F, 0x81..0xFE 0x30..0x39, 0x40..0x7E, 0x81..0xFE
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SJIS 0x00..0x7F, 0x81..0xF9 0x40..0x7E, 0x81..0xF9
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UTF-8 0x00..0x7F, 0xC2..0xF7 none
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Therefore, if the first byte of SUFFIX is < 0x30, it cannot occur as
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second or later byte, and therefore it is OK to do a bytewise search. */
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return str_endswith (string, suffix);
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/* Here, suffix is not empty. */
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size_t nbytes = strlen (string);
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if (nbytes >= strlen (suffix))
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{
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size_t len = mbslen (string);
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size_t n = mbslen (suffix);
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if (len >= n)
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{
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#if GNULIB_MCEL_PREFER
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char const *stringlim = string + nbytes;
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for (; len > n; len--)
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string += mcel_scan (string, stringlim).len;
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#else
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mbi_iterator_t iter;
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mbi_init (iter, string, nbytes);
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/* Advance past (len - n) multibyte characters. */
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for (; len > n; len--)
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{
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if (!mbi_avail (iter))
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/* We can get here due to incomplete multibyte characters. */
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return false;
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mbi_advance (iter);
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}
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if (!mbi_avail (iter))
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/* We can get here due to incomplete multibyte characters. */
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return false;
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string = mbi_cur_ptr (iter);
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#endif
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return streq (string, suffix);
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}
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}
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return false;
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}
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