bore

commit 3350a41744998de1b153f50d3e96be8bf7787e3d
parent 7ced46775c172ef29a9b91c4ab189838a01c02e5
Author: phoebos <ben@bvnf.space>
Date:   Thu,  3 Feb 2022 00:40:17 +0000

grep: check for regex errors

Diffstat:
M
grep.c
 | 
10
++++++++--

1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/grep.c b/grep.c
@@ -15,7 +15,6 @@ enum {
 int
 match(const char *string, regex_t *re) {
     int status = regexec(re, string, 0, NULL, 0);
-
     if (status != 0)
         return 0;
     return 1;
@@ -106,7 +105,14 @@ main(int argc, char **argv) {
 
     char *regexp = *++argv;
     regex_t re;
-    regcomp(&re, regexp, REGFLAGS);
+    int regerr = regcomp(&re, regexp, REGFLAGS);
+    if (regerr != 0) {
+        char errbuf[100] = {'\0'};
+        regerror(regerr, &re, errbuf, 100);
+        fprintf(stderr, "grep: bad regex: %s\n", errbuf);
+        regfree(&re);
+        return 1;
+    }
 
     if (argc == 1) {
         ret = grep(stdin, &re, flags);