From 27704df09917d797cfdc5c86446f2f28a066ca0b Mon Sep 17 00:00:00 2001
From: Kyryl Melekhin <k.melekhin@gmail.com>
Date: Sat, 31 Jul 2021 11:06:40 +0000
Subject: [PATCH] use frexible array for nsubs cache

---
 pike.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/pike.c b/pike.c
index f25effb..233dd7e 100644
--- a/pike.c
+++ b/pike.c
@@ -101,7 +101,7 @@ typedef struct rsub rsub;
 struct rsub
 {
 	int ref;
-	const char *sub[128];
+	const char *sub[];
 };
 
 typedef struct rthread rthread;
@@ -455,7 +455,7 @@ if (csub->ref > 1) { \
 	if (s1) \
 		freesub = (rsub*)s1->sub[0]; \
 	else \
-		s1 = &nsubs[subidx++]; \
+		s1 = (rsub*)&nsubs[rsubsize * subidx++]; \
 	for (j = 0; j < nsubp; j++) \
 		s1->sub[j] = csub->sub[j]; \
 	csub->ref--; \
@@ -532,12 +532,13 @@ nlist->n = 0; \
 int re_pikevm(rcode *prog, const char *s, const char **subp, int nsubp)
 {
 	int i, j, c, l = 0, *npc, gen = 1, subidx = 1;
+	int rsubsize = sizeof(rsub)+(sizeof(char*)*nsubp);
 	const char *sp = s;
-	rsub nsubs[256];
 	int plist[prog->unilen];
 	int *pcs[prog->splits];
 	rsub *subs[prog->splits];
-	rsub *nsub = nsubs, *lsub = nsub, *matched = NULL, *s1;
+	char nsubs[rsubsize*256];
+	rsub *nsub = (rsub*)nsubs, *lsub = nsub, *matched = NULL, *s1;
 	rsub *freesub = NULL;
 	rthreadlist _clist[1+prog->len]; 
 	rthreadlist _nlist[1+prog->len];