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/* Locale-specific case-ignoring memory comparison.
Copyright (C) 2001, 2009-2022 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2001.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "mbmemcasecoll.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
/* Get tolower(). */
#include <ctype.h>
/* Get mbstate_t, mbrtowc(), wcrtomb(). */
#include <wchar.h>
/* Get towlower(). */
#include <wctype.h>
#include "malloca.h"
#include "memcmp2.h"
#include "memcoll.h"
#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
/* Apply towlower() to the multibyte character sequence in INBUF, storing the
result as a multibyte character sequence in OUTBUF. */
static size_t
apply_towlower (const char *inbuf, size_t inbufsize,
char *outbuf, size_t outbufsize)
{
char *outbuf_orig = outbuf;
size_t remaining;
remaining = inbufsize;
while (remaining > 0)
{
wchar_t wc1;
size_t n1;
mbstate_t state;
memset (&state, '\0', sizeof (mbstate_t));
n1 = mbrtowc (&wc1, inbuf, remaining, &state);
if (n1 == (size_t)(-2))
break;
if (n1 != (size_t)(-1))
{
wint_t wc2;
if (n1 == 0) /* NUL character? */
n1 = 1;
wc2 = towlower (wc1);
if (wc2 != wc1)
{
size_t n2;
memset (&state, '\0', sizeof (mbstate_t));
n2 = wcrtomb (outbuf, wc2, &state);
if (n2 != (size_t)(-1))
{
/* Store the translated multibyte character. */
inbuf += n1;
remaining -= n1;
outbuf += n2;
continue;
}
}
/* Nothing to translate. */
memcpy (outbuf, inbuf, n1);
inbuf += n1;
remaining -= n1;
outbuf += n1;
continue;
}
/* Invalid multibyte character on input.
Copy one byte without modification. */
*outbuf++ = *inbuf++;
remaining -= 1;
}
/* Incomplete multibyte sequence on input.
Pass it through unmodified. */
while (remaining > 0)
{
*outbuf++ = *inbuf++;
remaining -= 1;
}
/* Verify the output buffer was large enough. */
if (outbuf - outbuf_orig > outbufsize)
abort ();
/* Return the number of written output bytes. */
return outbuf - outbuf_orig;
}
/* Apply tolower() to the unibyte character sequence in INBUF, storing the
result as a unibyte character sequence in OUTBUF. */
static void
apply_tolower (const char *inbuf, char *outbuf, size_t bufsize)
{
for (; bufsize > 0; bufsize--)
{
*outbuf = TOLOWER ((unsigned char) *inbuf);
inbuf++;
outbuf++;
}
}
int
mbmemcasecoll (const char *s1, size_t s1len, const char *s2, size_t s2len,
bool hard_LC_COLLATE)
{
char *t1;
size_t t1len;
char *t2;
size_t t2len;
char *memory;
int cmp;
if (MB_CUR_MAX > 1)
{
/* Application of towlower grows each character by a factor 2
at most. */
t1len = 2 * s1len;
t2len = 2 * s2len;
}
else
{
/* Application of tolower doesn't change the size. */
t1len = s1len;
t2len = s2len;
}
/* Allocate memory for t1 and t2. */
memory = (char *) malloca (t1len + 1 + t2len + 1);
if (memory == NULL)
{
errno = ENOMEM;
return 0;
}
t1 = memory;
t2 = memory + t1len + 1;
/* Csae-fold the two argument strings. */
if (MB_CUR_MAX > 1)
{
t1len = apply_towlower (s1, s1len, t1, t1len);
t2len = apply_towlower (s2, s2len, t2, t2len);
}
else
{
apply_tolower (s1, t1, s1len);
apply_tolower (s2, t2, s2len);
}
/* Compare the two case-folded strings. */
if (hard_LC_COLLATE)
cmp = memcoll (t1, t1len, t2, t2len);
else
{
cmp = memcmp2 (t1, t1len, t2, t2len);
errno = 0;
}
{
int saved_errno = errno;
freea (memory);
errno = saved_errno;
}
return cmp;
}
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