m4: Fix OOB access displaying MIN_INT

ebblake · emaste · commit ab4edcd552c9 · 2025-05-24T13:26:47.000-04:00
Previously displaying INT_MIN resulted in an out of bounds access to
digits[-8].  In twos-complement -INT_MIN is still negative.

PR:		287013
Reviewed by:	emaste
diff --git a/usr.bin/m4/misc.c b/usr.bin/m4/misc.c
@@ -121,7 +121,7 @@ void
 pbnumbase(int n, int base, int d)
 {
 	static char digits[36] = "0123456789abcdefghijklmnopqrstuvwxyz";
-	int num;
+	unsigned int num;
 	int printed = 0;
 
 	if (base > 36)

Original file line number	Diff line number	Diff line change
`@@ -121,7 +121,7 @@ void`
`121`	`121`	`pbnumbase(int n, int base, int d)`
`122`	`122`	`{`
`123`	`123`	`static char digits[36] = "0123456789abcdefghijklmnopqrstuvwxyz";`
`124`		`- int num;`
	`124`	`+ unsigned int num;`
`125`	`125`	`int printed = 0;`
`126`	`126`
`127`	`127`	`if (base > 36)`