Warn the user if format is too long.

diff --git a/spectrwm.c b/spectrwm.c
index 082d04ea2d19d78f67fc73d7ac9e41cada19e191..abf3d20165511a62a72eaeeac567a7f7ecee16a8 100644 (file)
--- a/spectrwm.c
+++ b/spectrwm.c
@@ -1575,7 +1575,8 @@ bar_fmt_expand(char *fmtexp, size_t sz)
        strlcpy(fmtexp, fmt, sz);
        /* finally pass the string through strftime(3) */
 #ifndef SWM_DENY_CLOCK_FORMAT
-       len = strftime(fmtexp, sz, fmt, &tm);
+       if ((len = strftime(fmtexp, sz, fmt, &tm)) == 0)
+               warnx("format too long");
        fmtexp[len] = '\0';
 #endif
 }