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/* str/diff.c - Differentiate two strings
* Copyright (C) 2001 Bruce Guenter <bruceg@em.ca>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include "str.h"
int str_diff(const str* a, const str* b)
{
return str_diffb(a, b->s, b->len);
}
int str_diffs(const str* a, const char* b)
{
return str_diffb(a, b, strlen(b));
}
int str_diffb(const str* a, const char* b, unsigned len)
{
unsigned max;
char* aptr;
max = a->len;
if (max > len) max = len;
for (aptr = a->s; max; ++aptr, ++b, --max)
if (*b - *aptr) return *b - *aptr;
if (a->len > len) return 1;
if (a->len < len) return -1;
return 0;
}
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