improved the speed somewhat

fixed bug with negative chars in comparisons

lang/cem/libcc.ansi/string/strncmp.c

@@ -7,15 +7,20 @@
 #include	<string.h>
 
 int
-strncmp(register const char *s1, register const char *s2, size_t n)
+strncmp(register const char *s1, register const char *s2, register size_t n)
 {
-	while (n > 0) {
-		n--;
-		if (*s1 != *s2)
+	if (n) {
+		do {
+			if (*s1 != *s2++)
+				break;
+			if (*s1++ == '\0')
+				return 0;
+		} while (--n > 0);
+		if (n > 0) {
+			if (*s1 == '\0') return -1;
+			if (*--s2 == '\0') return 1;
 			return *s1 - *s2;
-		if (*s1++ == '\0')
-			return 0;
-		s2++;
+		}
 	}
 	return 0;
 }