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/* mbs_endswith function.
Copyright (C) 2025-2026 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This file 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2025. */
#include <config.h>
/* Specification. */
#include <string.h>
#include "mbiter.h"
bool
mbs_endswith (const char *string, const char *suffix)
{
if ((unsigned char) suffix[0] < 0x30)
/* Some knowledge about the possible multibyte encodings:
Encoding First byte of character Which of these can occur
as second or later byte?
EUC-JP 0x00..0x7F, 0x8E..0xFE 0xA1..0xFE
EUC-KR 0x00..0x7F, 0xA1..0xFD 0xA1..0xFD
GB2312 0x00..0x7F, 0xA1..0xF7 0xA1..0xF7
EUC-TW 0x00..0x7F, 0x8E..0xFD 0xA1..0xFD
BIG5 0x00..0x7F, 0xA1..0xF9 0x40..0x7E, 0xA1..0xF9
GB18030 0x00..0x7F, 0x81..0xFE 0x30..0x39, 0x40..0x7E, 0x81..0xFE
SJIS 0x00..0x7F, 0x81..0xF9 0x40..0x7E, 0x81..0xF9
UTF-8 0x00..0x7F, 0xC2..0xF7 none
Therefore, if the first byte of SUFFIX is < 0x30, it cannot occur as
second or later byte, and therefore it is OK to do a bytewise search. */
return str_endswith (string, suffix);
/* Here, suffix is not empty. */
size_t nbytes = strlen (string);
if (nbytes >= strlen (suffix))
{
size_t len = mbslen (string);
size_t n = mbslen (suffix);
if (len >= n)
{
mbi_iterator_t iter;
mbi_init (iter, string, nbytes);
/* Advance past (len - n) multibyte characters. */
for (; len > n; len--)
{
if (!mbi_avail (iter))
/* We can get here due to incomplete multibyte characters. */
return false;
mbi_advance (iter);
}
if (!mbi_avail (iter))
/* We can get here due to incomplete multibyte characters. */
return false;
return streq (mbi_cur_ptr (iter), suffix);
}
}
return false;
}
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