only compile the regex once

1 files changed, 8 insertions, 9 deletions

diff --git a/includes.c b/includes.c
index 103c8fd..cbef99a 100644
--- a/includes.c
+++ b/includes.c
@@ -51,19 +51,18 @@ static struct majefile * find_inc(const struct majefile *file, const regex_t * r
 
 struct majefile *find_includes(const struct majefile *source)
 {
-	regex_t re;
-	int rc = regcomp(&re,
-		"#[[:space:]]*include[[:space:]]+.*\"(.*)\"",
-		REG_EXTENDED | REG_NEWLINE);
-	if (rc != 0) {
-		fprintf(stderr, "maje: regcomp() failed\n");
-		abort();
+	static regex_t re = { .re_nsub = (size_t)-1 };
+	if (re.re_nsub == (size_t)-1) {
+		if (regcomp(&re,
+			"#[[:space:]]*include[[:space:]]+.*\"(.*)\"",
+			REG_EXTENDED | REG_NEWLINE) != 0) {
+			fprintf(stderr, "maje: regcomp(#include) failed\n");
+			abort();
+		}
 	}
 
 	struct majefile *ret = find_inc(source, &re);
 
-	regfree(&re);
-
 	if (ret != NULL) {
 		while (ret->prev != NULL) {
 			ret = ret->prev;