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mruby-regexp: use dynamic captures allocation in exec_match()

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Replace fixed RE_MAX_CAPTURES*2 (256 bytes) stack array with
malloc sized to actual pat->num_captures*2. Consistent with
the Pike VM's dynamic ncap-sized pool.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2026-03-23 09:37:31 +09:00
parent 1f0809aad3
commit 6edef4e7e6
1 changed files with 8 additions and 4 deletions
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mrbgems/mruby-regexp/src/regexp.c
+8 -4
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@@ -196,16 +196,20 @@ exec_match(mrb_state *mrb, mrb_value self, mrb_value str, mrb_int pos)
mrb_regexp_pattern *pat = DATA_GET_PTR(mrb, self, &regexp_type, mrb_regexp_pattern);
if (!pat) mrb_raise(mrb, E_ARGUMENT_ERROR, "uninitialized Regexp");
int captures[RE_MAX_CAPTURES * 2];
memset(captures, -1, sizeof(captures));
int cap_size = pat->num_captures * 2;
int *captures = (int*)mrb_malloc(mrb, sizeof(int) * cap_size);
memset(captures, -1, sizeof(int) * cap_size);
int ncap = re_exec(mrb, pat, RSTRING_PTR(str), RSTRING_LEN(str), pos,
captures, pat->num_captures * 2);
captures, cap_size);
if (ncap == 0) {
mrb_free(mrb, captures);
clear_match_globals(mrb);
return mrb_nil_value();
}
return create_matchdata(mrb, self, str, captures, pat->num_captures * 2);
mrb_value md = create_matchdata(mrb, self, str, captures, cap_size);
mrb_free(mrb, captures);
return md;
}
/*