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106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/* Locale-specific memory transformation
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Copyright (C) 2006 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert <eggert@cs.ucla.edu>. */
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#include <config.h>
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#include "memxfrm.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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/* Store into DEST (of size DESTSIZE) the text in SRC (of size SRCSIZE)
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transformed so that the result of memcmp on two transformed texts
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(with ties going to the longer text) is the same as the result of
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memcoll on the two texts before their transformation. Perhaps
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temporarily modify the byte after SRC, but restore its original
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contents before returning.
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Return the size of the resulting text, or an indeterminate value if
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there is an error. Set errno to an error number if there is an
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error, and to zero otherwise. DEST contains an indeterminate value
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if there is an error or if the resulting size is greater than
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DESTSIZE. */
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size_t
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memxfrm (char *restrict dest, size_t destsize,
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char *restrict src, size_t srcsize)
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{
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#if HAVE_STRXFRM
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size_t di = 0;
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size_t si = 0;
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size_t result = 0;
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char ch = src[srcsize];
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src[srcsize] = '\0';
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while (si < srcsize)
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{
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size_t slen = strlen (src + si);
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size_t result0 = result;
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errno = 0;
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result += strxfrm (dest + di, src + si, destsize - di) + 1;
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if (errno != 0)
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break;
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if (result <= result0)
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{
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errno = ERANGE;
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break;
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}
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if (result == destsize + 1 && si + slen == srcsize)
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{
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/* The destination is exactly the right size, but strxfrm wants
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room for a trailing null. Work around the problem with a
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temporary buffer. */
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size_t bufsize = destsize - di + 1;
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char stackbuf[4000];
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char *buf = stackbuf;
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if (sizeof stackbuf < bufsize)
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{
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buf = malloc (bufsize);
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if (! buf)
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break;
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}
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strxfrm (buf, src + si, bufsize);
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memcpy (dest + di, buf, destsize - di);
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if (sizeof stackbuf < bufsize)
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free (buf);
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errno = 0;
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}
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di = (result < destsize ? result : destsize);
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si += slen + 1;
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}
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src[srcsize] = ch;
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return result - (si != srcsize);
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#else
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if (srcsize < destsize)
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memcpy (dest, src, srcsize);
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errno = 0;
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return srcsize;
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#endif
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}
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