improved the speed somewhat

fixed bug with negative chars in comparisons

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

@@ -7,17 +7,18 @@
 #include	<string.h>
 
 char *
-strncpy(char *ret, register const char *s2, size_t n)
+strncpy(char *ret, register const char *s2, register size_t n)
 {
 	register char *s1 = ret;
 
-	while (*s2 && n > 0) {
-		n--;
-		*s1++ = *s2++;
-	}
-	while (n > 0) {
-		n--;
-		*s1++ = '\0';
+	if (n>0) {
+		while((*s1++ = *s2++) && --n > 0)
+			/* EMPTY */ ;
+		if ((*--s2 == '\0') && --n > 0) {
+			do {
+				*s1++ = '\0';
+			} while(--n > 0);
+		}
 	}
 	return ret;
 }