From 7fecafe015505c0ebd47780050118ff789a9ae3f Mon Sep 17 00:00:00 2001
From: jvoisin
Date: Thu, 30 Apr 2026 17:57:51 +0200
Subject: Fix a POSIX violation for swab

---
 include/unistd.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'include/unistd.h')

diff --git a/include/unistd.h b/include/unistd.h
index a2b3105..a73279b 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -177,7 +177,7 @@ _FORTIFY_FN(swab) void swab(const void * _FORTIFY_POS0 __os,
 	size_t __bs = __bos(__os, 0);
 	size_t __bd = __bos(__od, 0);
 
-	if ((size_t)__n > __bs || (size_t)__n > __bd)
+	if (__n > 0 && ((size_t)__n > __bs || (size_t)__n > __bd))
 		__builtin_trap();
 	return __orig_swab(__os, __od, __n);
 }
-- 
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