[hackers] [sent] Fix memory leak and print a warning on invalid regex || FRIGN

[git]

commit 072a318adbdf091a58587c740d081d0ccfff271c
Author:     FRIGN <d...@frign.de>
AuthorDate: Thu Aug 11 21:30:34 2016 +0200
Commit:     Markus Teich <markus.te...@stusta.mhn.de>
CommitDate: Thu Aug 11 23:42:09 2016 +0200

    Fix memory leak and print a warning on invalid regex
    
    This will minimize the already low memory usage of sent.

diff --git a/sent.c b/sent.c
index a4d0cd2..1e1353c 100644
--- a/sent.c
+++ b/sent.c
@@ -185,12 +185,16 @@ ffload(Slide *s)
 
        for (i = 0; i < LEN(filters); i++) {
                if (regcomp(&regex, filters[i].regex,
-                           REG_NOSUB | REG_EXTENDED | REG_ICASE))
+                           REG_NOSUB | REG_EXTENDED | REG_ICASE)) {
+                       fprintf(stderr, "sent: Invalid regex '%s'\n", 
filters[i].regex);
                        continue;
+               }
                if (!regexec(&regex, filename, 0, NULL, 0)) {
                        bin = filters[i].bin;
+                       regfree(&regex);
                        break;
                }
+               regfree(&regex);
        }
        if (!bin)
                die("sent: Unable to find matching filter for file %s", 
filename);