From fddda835a28bbc52a8d8450395a3e57e181782a8 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Wed, 26 Jun 2024 21:47:15 +0200
Subject: LibC: Fix regression in printf

printf did not write out anything for %d when the value was zero.
---
 userland/libc/stdio/vfprintf.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'userland/libc/stdio')

diff --git a/userland/libc/stdio/vfprintf.c b/userland/libc/stdio/vfprintf.c
index 2ba3e2c..d384c1d 100644
--- a/userland/libc/stdio/vfprintf.c
+++ b/userland/libc/stdio/vfprintf.c
@@ -28,8 +28,13 @@ int fprint_num(FILE *f, long long n, int base, char *char_set, int prefix,
     n *= -1;
   }
 
-  for (; n != 0 && i < 32; i++, n /= base)
-    str[i] = char_set[(n % base)];
+  if (0 == n) {
+    str[i] = char_set[0];
+    i++;
+  } else {
+    for (; n != 0 && i < 32; i++, n /= base)
+      str[i] = char_set[(n % base)];
+  }
 
   if (is_signed) {
     str[i] = '-';
-- 
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