File: strcmp.c

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/*
 * strcmp.c
 */

#include <string.h>

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

    while (1) {
	d = (int)(ch = *c1++) - (int)*c2++;
	if (d || !ch)
	    break;
    }

    return d;
}