Merge pull request lh3#12 from iamleot/cc_func-avoid-undefined-behaviour

Avoid undefined behaviour when using ctype(3) functions in relex() (possible fix for lh3#11)

b.c

@@ -27,6 +27,7 @@ THIS SOFTWARE.
 #define	DEBUG
 
 #include <ctype.h>
+#include <limits.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
@@ -831,7 +832,7 @@ int relex(void)		/* lexical analyzer for reparse */
 					 * not without first adapting the entire
 					 * program to track each string's length.
 					 */
-					for (i = 1; i < NCHARS; i++) {
+					for (i = 1; i <= UCHAR_MAX; i++) {
 						if (!adjbuf((char **) &buf, &bufsz, bp-buf+1, 100, (char **) &bp, "relex2"))
 						    FATAL("out of space for reg expr %.10s...", lastre);
 						if (cc->cc_func(i)) {