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-rw-r--r--sprintf.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/sprintf.c b/sprintf.c
index 953ce5054c..4c5e56843c 100644
--- a/sprintf.c
+++ b/sprintf.c
@@ -399,13 +399,15 @@ rb_str_format(int argc, const VALUE *argv, VALUE fmt)
case 'c':
{
VALUE val = GETARG();
+ VALUE tmp;
char c;
- if (rb_check_string_type(val)) {
- if (RSTRING(val)->len != 1) {
+ tmp = rb_check_string_type(val);
+ if (!NIL_P(tmp)) {
+ if (RSTRING(tmp)->len != 1) {
rb_raise(rb_eArgError, "%%c requires a character");
}
- c = RSTRING(val)->ptr[0];
+ c = RSTRING(tmp)->ptr[0];
}
else {
c = NUM2INT(val) & 0xff;