93 lines
2.5 KiB
C
Executable File
93 lines
2.5 KiB
C
Executable File
/* Transform wide string for comparison using the current locale.
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Copyright (C) 2011-2024 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2011.
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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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size_t
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wcsxfrm (wchar_t *s1, const wchar_t *s2, size_t n)
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{
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char mbbuf2[1024];
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char *mbs2;
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{
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int saved_errno = errno;
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size_t result;
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/* Convert s2 to a multibyte string, trying to avoid malloc(). */
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{
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size_t ret;
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ret = wcstombs (mbbuf2, s2, sizeof (mbbuf2));
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if (ret == (size_t)-1)
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goto failed;
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if (ret < sizeof (mbbuf2))
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mbs2 = mbbuf2;
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else
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{
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size_t need = wcstombs (NULL, s2, 0);
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if (need == (size_t)-1)
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goto failed;
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mbs2 = (char *) malloc (need + 1);
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if (mbs2 == NULL)
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goto out_of_memory;
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ret = wcstombs (mbs2, s2, need + 1);
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if (ret != need)
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abort ();
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}
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}
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/* Transform the multibyte string. */
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errno = 0;
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result = strxfrm ((char *)s1, mbs2, n);
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if (errno != 0)
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{
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/* An error occurred. */
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if (mbs2 != mbbuf2)
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free (mbs2);
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return 0;
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}
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if (result < n)
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{
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/* Convert the result by mapping char[] -> wchar_t[].
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Since strcmp() compares the elements as 'unsigned char' values,
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whereas wcscmp() compares the elements as 'wchar_t' values, we need
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to map 1 'unsigned char' to 1 'wchar_t'. (We could also map 2
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consecutive 'unsigned char' values to 1 'wchar_t' value, but this is
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not needed. */
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wchar_t *wcp = s1 + n;
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char *cp = (char *)s1 + n;
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while (wcp > s1)
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*--wcp = (wchar_t) (unsigned char) *--cp;
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}
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if (mbs2 != mbbuf2)
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free (mbs2);
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/* No error. */
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errno = saved_errno;
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return result;
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}
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out_of_memory:
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errno = ENOMEM;
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return 0;
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failed:
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errno = EILSEQ;
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return 0;
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}
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