Fixed overflow at onig_region_set

To get rid of a bug of `onig_region_set` which takes `int`s
instead of `OnigPosition`s, set elements of `beg` and `end`
members directly, for the time being.

1 files changed, 7 insertions, 3 deletions

diff --git a/ext/strscan/strscan.c b/ext/strscan/strscan.c
index 99d6992601..84bf884a56 100644
--- a/ext/strscan/strscan.c
+++ b/ext/strscan/strscan.c
@@ -499,13 +499,17 @@ match_target(struct strscanner *p)
 static inline void
 set_registers(struct strscanner *p, size_t length)
 {
-    onig_region_clear(&(p->regs));
+    const int at = 0;
+    OnigRegion *regs = &(p->regs);
+    onig_region_clear(regs);
+    if (onig_region_set(regs, at, 0, 0)) return;
     if (p->fixed_anchor_p) {
-        onig_region_set(&(p->regs), 0, p->curr, p->curr + length);
+        regs->beg[at] = p->curr;
+        regs->end[at] = p->curr + length;
     }
     else
     {
-        onig_region_set(&(p->regs), 0, 0, length);
+        regs->end[at] = length;
     }
 }