fix iui_label buffer alloc; who needs va_copy anyways C89 FTWHEADmaster

1 files changed, 8 insertions, 2 deletions

diff --git a/sources/iui.c b/sources/iui.c
index 6f82ad1..4e656c6 100644
--- a/sources/iui.c
+++ b/sources/iui.c
@@ -148,10 +148,16 @@ void iui_label(iui* ui, u16 x, u16 y, int w, int h, char* fmt, ...)
     va_list ap = {0};
     xctx*  x11 = (xctx*)ui->usr;
 
-    buf = ar_push(ui->ar, 512);
 
     va_start(ap, fmt);
-        len = vsnprintf(buf, 511, fmt, ap);
+        len = vsnprintf(NULL, 0, fmt, ap);
+    va_end(ap);
+
+    if(len) len++;
+    buf = ar_push(ui->ar, len);
+
+    va_start(ap, fmt);
+        len = vsnprintf(buf, len, fmt, ap);
     va_end(ap);
 
     {