summaryrefslogtreecommitdiffstats
path: root/argp-standalone/strcasecmp.c
blob: 9c1637232fddb8e625b38c628c783880519abaa1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
/* strcasecmp.c
 *
 */

/* Written by Niels Möller <nisse@lysator.liu.se>
 *
 * This file is hereby placed in the public domain.
 */

#include <ctype.h>
int strcasecmp(const char *, const char *);

int strcasecmp(const char *s1, const char *s2)
{
  unsigned i;
  
  for (i = 0; s1[i] && s2[i]; i++)
    {
      unsigned char c1 = tolower( (unsigned char) s1[i]);
      unsigned char c2 = tolower( (unsigned char) s2[i]);

      if (c1 < c2)
	return -1;
      else if (c1 > c2)
	return 1;
    }

  return !s2[i] - !s1[i];	
}