Plan 9 from Bell Labs’s /usr/web/sources/plan9/sys/src/ape/lib/bsd/strncasecmp.c

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
Download the Plan 9 distribution.


#include <string.h>

typedef unsigned char uchar;

int
strncasecmp(char *s1, char *s2, int n)
{
	int c1, c2;

	while(*s1 && n-- > 0){
		c1 = *(uchar*)s1++;
		c2 = *(uchar*)s2++;

		if(c1 == c2)
			continue;

		if(c1 >= 'A' && c1 <= 'Z')
			c1 -= 'A' - 'a';

		if(c2 >= 'A' && c2 <= 'Z')
			c2 -= 'A' - 'a';

		if(c1 != c2)
			return c1 - c2;
	}
	if(n <= 0)
		return 0;
	return -*s2;
}

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