photon/libc/string/strcmp.c

#include <stddef.h>

int strcmp(const char *s1, const char *s2)
{
    int i;
    for (i = 0; s1[i] == s2[i]; i++) {
        if (s1[i] == '\0') {
            return 0;
        }
    }

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

int strncmp(const char *s1, const char *s2, size_t n)
{
    for (; n > 0; s1++, s2++, --n) {
        if (*s1 != *s2) {
            return ((*(unsigned char *)s1 < *(unsigned char *)s2) ? -1 : 1);
        } else if (*s1 == '\0') {
            return 0;
        }
    }
    return 0;
}