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/* str/cmp.c - Compare part of two strings
* Copyright (C) 2001,2005 Bruce Guenter <bruce@untroubled.org>
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include "str.h"
/** Compare part of two strings.
This function compares two strings, starting at \c aoffset bytes into \c
a and \c boffset bytes into \c b. The first non-zero difference is
returned. If the portion of \c b is longer than the portion of \c a,
the result is positive.
*/
int str_cmp(const str* a, unsigned aoffset, const str* b, unsigned boffset)
{
return str_cmpb(a, aoffset, b->s+boffset, b->len-boffset);
}
/** Compare a string against a C string. */
int str_cmps(const str* a, unsigned offset, const char* b)
{
return str_cmpb(a, offset, b, strlen(b));
}
/** Compare a string against a binary block. */
int str_cmpb(const str* a, unsigned offset, const char* b, unsigned len)
{
char* aptr;
if (len + offset > a->len)
return 1;
for (aptr = a->s+offset; len; ++aptr, ++b, --len)
if (*b - *aptr) return *b - *aptr;
return 0;
}
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