Use getprogname(3) rather than __progname.

Suggested by Joerg@ Sonnenberger (NetBSD).
Last year, deraadt@ confirmed on tech@ that this "has the potential
to be more portable", and micro-optimizing for speed is not relevant
here.  Also gets rid of one global variable.

1 files changed, 5 insertions, 4 deletions

diff --git a/test-progname.c b/test-progname.c
index 79add7eb..0418b3c0 100644
--- a/test-progname.c
+++ b/test-progname.c
@@ -1,9 +1,10 @@
-#include <string.h>
-
-extern char *__progname;
+#include <stdlib.h>
 
 int
 main(void)
 {
-	return !!strcmp(__progname, "test-progname");
+	const char * progname;
+
+	progname = getprogname();
+	return progname == NULL;
 }