From f5200a50fa42fdaed40ecc67b27f41be328a6a01 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Thu, 7 Oct 2004 16:15:22 +0000
Subject: Avoid a memory allocation when possible.

---
 lib/snprintf.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

(limited to 'lib/snprintf.c')

diff --git a/lib/snprintf.c b/lib/snprintf.c
index 667ed94625..9a4edc1f5f 100644
--- a/lib/snprintf.c
+++ b/lib/snprintf.c
@@ -42,19 +42,19 @@ snprintf (char *str, size_t size, const char *format, ...)
   va_list args;
 
   va_start (args, format);
-  output = vasnprintf (NULL, &len, format, args);
+  len = size;
+  output = vasnprintf (str, &len, format, args);
   va_end (args);
 
   if (!output)
     return -1;
 
-  if (str && size > 0)
-    {
-      memcpy (str, output, MIN (len + 1, size));
+  if (str != NULL)
+    if (len > size - 1) /* equivalent to: (size > 0 && len >= size) */
       str[size - 1] = '\0';
-    }
 
-  free (output);
+  if (output != str)
+    free (output);
 
   return len;
 }
-- 
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