diff options
| -rw-r--r-- | xlsclients.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/xlsclients.c b/xlsclients.c index 24cbbd9..6153927 100644 --- a/xlsclients.c +++ b/xlsclients.c @@ -65,8 +65,11 @@ typedef int Bool; #define True (!False) static void -usage(void) +usage(const char *errmsg) { + if (errmsg != NULL) + fprintf (stderr, "%s: %s\n\n", ProgramName, errmsg); + fprintf (stderr, "usage: %s [-display dpy] [-m len] [-[a][l]] [-version]\n", ProgramName); @@ -162,11 +165,11 @@ main(int argc, char *argv[]) switch (arg[1]) { case 'd': /* -display dpyname */ - if (++i >= argc) usage (); + if (++i >= argc) usage ("-display requires an argument"); displayname = argv[i]; continue; case 'm': /* -max maxcmdlen */ - if (++i >= argc) usage (); + if (++i >= argc) usage ("-max requires an argument"); maxcmdlen = atoi (argv[i]); continue; case 'v': /* -version */ @@ -183,11 +186,15 @@ main(int argc, char *argv[]) verbose = True; continue; default: - usage (); + fprintf (stderr, "%s: unrecognized argument -%s\n\n", + ProgramName, cp); + usage (NULL); } } } else { - usage (); + fprintf (stderr, "%s: unrecognized argument %s\n\n", + ProgramName, arg); + usage (NULL); } } |