[PATCH] build system: prevent duplicate applet names

[Ron Yorston]

The embedded script feature makes it easier to create applets with
duplicate names.  Currently in such cases the build succeeds but
the resulting executable doesn't work as the developer intended.

Catch duplicate names when the applet tables are being generated
and make the build fail.

Signed-off-by: Ron Yorston <rmy at pobox.com>
---
 applets/applet_tables.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/applets/applet_tables.c b/applets/applet_tables.c
index e3d10c83f..ce2037440 100644
--- a/applets/applet_tables.c
+++ b/applets/applet_tables.c
@@ -84,7 +84,15 @@ int main(int argc, char **argv)
 
 	qsort(applets, NUM_APPLETS, sizeof(applets[0]), cmp_name);
 
-	if (!argv[1])
+	for (i = j = 0; i < NUM_APPLETS-1; ++i) {
+		if (cmp_name(applets+i, applets+i+1) == 0) {
+			fprintf(stderr, "%s: duplicate applet name '%s'\n", argv[0],
+					applets[i].name);
+			j = 1;
+		}
+	}
+
+	if (j != 0 || !argv[1])
 		return 1;
 	snprintf(tmp1, PATH_MAX, "%s.%u.new", argv[1], (int) getpid());
 	i = open(tmp1, O_WRONLY | O_TRUNC | O_CREAT, 0666);
-- 
2.19.1