drw_text: don't segfault when called with 0 width

this patch just rejects *any* 0 width draws, which is surely an error by
the caller.

this also guards against cases where the width is too small for the
ellipsis to fit, so ellipsis_w will remain 0.
reported by Bakkeby <bakkeby@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drw.c b/drw.c
index a50c9ee..2f3a5df 100644
--- a/drw.c
+++ b/drw.c
@@ -267,7 +267,7 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
         enum { nomatches_len = 64 };
         static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches;
 
-        if (!drw || (render && !drw->scheme) || !text || !drw->fonts)
+        if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
                 return 0;
 
         if (!render) {