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/* Compare two memory areas with possibly different lengths, case-insensitive.
Copyright (C) 1998-1999, 2005-2021 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2009,
based on earlier glibc code.
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/>. */
#include <config.h>
/* Specification. */
#include "mbmemcasecmp.h"
#include <ctype.h>
#include <limits.h>
#include <stdlib.h>
#include "mbiter.h"
#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
int
mbmemcasecmp (const char *s1, size_t n1, const char *s2, size_t n2)
{
if (s1 == s2)
return _GL_CMP (n1, n2);
if (MB_CUR_MAX > 1)
{
mbi_iterator_t iter1;
mbi_iterator_t iter2;
mbi_init (iter1, s1, n1);
mbi_init (iter2, s2, n2);
while (mbi_avail (iter1) && mbi_avail (iter2))
{
int cmp = mb_casecmp (mbi_cur (iter1), mbi_cur (iter2));
if (cmp != 0)
return cmp;
mbi_advance (iter1);
mbi_advance (iter2);
}
if (mbi_avail (iter1))
/* s2 terminated before s1. */
return 1;
if (mbi_avail (iter2))
/* s1 terminated before s2. */
return -1;
return 0;
}
else
{
const unsigned char *s1_end = (const unsigned char *) (s1 + n1);
const unsigned char *s2_end = (const unsigned char *) (s2 + n2);
const unsigned char *p1 = (const unsigned char *) s1;
const unsigned char *p2 = (const unsigned char *) s2;
while (p1 < s1_end && p2 < s2_end)
{
unsigned char c1 = TOLOWER (*p1);
unsigned char c2 = TOLOWER (*p2);
if (c1 != c2)
{
if (UCHAR_MAX <= INT_MAX)
return c1 - c2;
else
/* On machines where 'char' and 'int' are types of the same
size, the difference of two 'unsigned char' values
- including the sign bit - doesn't fit in an 'int'. */
return _GL_CMP (c1, c2);
}
++p1;
++p2;
}
if (p1 < s1_end)
/* s2 terminated before s1. */
return 1;
if (p2 < s2_end)
/* s1 terminated before s2. */
return -1;
return 0;
}
}
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