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-rw-r--r--ext/stringio/stringio.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index 07ee38dd48..6a50fabaed 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -651,8 +651,8 @@ strio_gets_internal(argc, argv, ptr)
str = rb_str_substr(ptr->string, ptr->pos, e - s);
}
else {
- if (n < s - e) {
- if (s - e < 1024) {
+ if (n < e - s) {
+ if (e - s < 1024) {
for (p = s; p + n <= e; ++p) {
if (MEMCMP(p, RSTRING(str)->ptr, char, n) == 0) {
e = p + n;