com32/lib/strncasecmp.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

/*
 * strncasecmp.c
 */

#include <string.h>
#include <ctype.h>

int strncasecmp(const char *s1, const char *s2, size_t n)
{
    const unsigned char *c1 = s1, *c2 = s2;
    unsigned char ch;
    int d = 0;

    while (n--) {
	/* toupper() expects an unsigned char (implicitly cast to int)
	   as input, and returns an int, which is exactly what we want. */
	d = toupper(ch = *c1++) - toupper(*c2++);
	if (d || !ch)
	    break;
    }

    return d;
}