xregcomp: don't consider every regex compilation failure an internal error.

This pushes the error handling up one step, but makes the function
more flexible. Running out of memory still triggers an internal error,
in the spirit of other xutils functions.

1 files changed, 4 insertions, 3 deletions

diff --git a/notmuch-restore.c b/notmuch-restore.c
index ff1ebab1..13b4325a 100644
--- a/notmuch-restore.c
+++ b/notmuch-restore.c
@@ -88,9 +88,10 @@ notmuch_restore_command (unused (void *ctx), int argc, char *argv[])
      * non-space characters for the message-id, then one or more
      * spaces, then a list of space-separated tags as a sequence of
      * characters within literal '(' and ')'. */
-    xregcomp (&regex,
-	      "^([^ ]+) \\(([^)]*)\\)$",
-	      REG_EXTENDED);
+    if ( xregcomp (&regex,
+		   "^([^ ]+) \\(([^)]*)\\)$",
+		   REG_EXTENDED) )
+	INTERNAL_ERROR("compile time constant regex failed.");
 
     while ((line_len = getline (&line, &line_size, input)) != -1) {
 	regmatch_t match[3];