+
−/*
+
− * Compare strings (at most n bytes):  s1>s2: >0  s1==s2: 0  s1<s2: <0
+
− */
+
−
+
−strncmp(s1, s2, n)
+
−	register char *s1, *s2;
+
−	register n;
+
−{
+
−	while (--n >= 0 && *s1 == *s2++)
+
−		if (*s1++ == '\0')
+
−			return(0);
+
−	return(n<0 ? 0 : *s1 - *--s2);
+
−}