don't assume positive argc

handle a rare, but possible case of argc being 0, in which case argv[0]
would be null.

note that both POSIX and ISO C standard allow argc to be 0 and in
practice this can be triggered via calling `exec(3)` family of functions
with NULL as the first `argv`.

1 files changed, 1 insertions, 1 deletions

diff --git a/util.c b/util.c
index f03fe23..8b164ed 100644
--- a/util.c
+++ b/util.c
@@ -28,7 +28,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
-const char *progname;
+const char *progname = "nsxiv";
 
 void* emalloc(size_t size)
 {