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