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#include <stddef.h> // for NULL
int strcmp(const char *s1, const char *s2)
{
const unsigned char *p1 = (const unsigned char *)s1;
const unsigned char *p2 = (const unsigned char *)s2;
if (p1 == NULL && p2 == NULL)
return 0;
if (p1 == NULL)
return -1;
if (p2 == NULL)
return 1;
while (*p1 == *p2 && *p1 != '\0') {
p1++;
p2++;
}
return *p1 - *p2;
}
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