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Fix incorrect uses of ctype.h (passing it uncast chars, or other
[sgt/puzzles]
/
singles.c
diff --git
a/singles.c
b/singles.c
index
d8016ff
..
c20d0cf
100644
(file)
--- a/
singles.c
+++ b/
singles.c
@@
-324,7
+324,7
@@
static char n2c(int num) {
}
static int c2n(char c) {
- if (isdigit(c))
+ if (isdigit(
(unsigned char)
c))
return (int)(c - '0');
else if (c >= 'a' && c <= 'z')
return (int)(c - 'a' + 10);