Check for wildcards matching *.alf; generally this is an error.

1 files changed, 12 insertions, 1 deletions

diff --git a/src/opts.c b/src/opts.c
index 3120317..3237642 100644
--- a/src/opts.c
+++ b/src/opts.c
@@ -27,6 +27,7 @@ static void show_globs(void) {
 
 void parse_opts(int argc, char * const *argv) {
 	int opt;
+	char **ig;
 
 	while((opt = getopt(argc, argv, OPTIONS)) != -1) {
 		switch(opt) {
@@ -55,7 +56,17 @@ void parse_opts(int argc, char * const *argv) {
 	}
 
 	in_filename = argv[optind];
-	include_globs = &argv[optind + 1]; /* might be null, that's OK */
+	if(optind < argc)
+		include_globs = &argv[optind + 1]; /* might be null, that's OK */
+
+	ig = (char **)include_globs;
+	while(*ig) {
+		if(globmatch("*.alf", *ig)) {
+			fprintf(stderr, "%s: ALF files don't normally contain other ALF files, are you trying to extract/list multiple ALF files at once?\n", self);
+			break;
+		}
+		ig++;
+	}
 
 #ifdef DEBUG_GLOBS
 	show_globs();