tab-complete: figure out the size before copying

we already need to know the string length since `cursor` needs to be
adjusted.

so just calculate the length beforehand and use `memcpy` to copy exactly
as much as needed (as opposed to `strncpy` which always writes `n`
bytes).

1 files changed, 2 insertions, 2 deletions

diff --git a/dmenu.c b/dmenu.c
index 969f6d8..6b285df 100644
--- a/dmenu.c
+++ b/dmenu.c
@@ -517,9 +517,9 @@ insert:
         case XK_Tab:
                 if (!sel)
                         return;
-                strncpy(text, sel->text, sizeof text - 1);
+                cursor = strnlen(sel->text, sizeof text - 1);
+                memcpy(text, sel->text, cursor);
                 text[sizeof text - 1] = '\0';
-                cursor = strlen(text);
                 match();
                 break;
         }