X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=lib%2Fvasnprintf.c;h=324d62ecda912c8e7e9e3ffd58908a15a7c2fc8d;hb=083768e30add2d4c53372b98ae64092d1b97ee4b;hp=0fa24708fe80aa96212f25c60d633106a4b2bd68;hpb=325083763c51b8d7beb17a03e1db01a76fb98b07;p=gnulib.git

diff --git a/lib/vasnprintf.c b/lib/vasnprintf.c
index 0fa24708f..324d62ecd 100644
--- a/lib/vasnprintf.c
+++ b/lib/vasnprintf.c
@@ -1,5 +1,5 @@
 /* vsprintf with automatic memory allocation.
-   Copyright (C) 1999, 2002-2004 Free Software Foundation, Inc.
+   Copyright (C) 1999, 2002-2005 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -13,7 +13,7 @@
 
    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation,
-   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
 /* Tell glibc's <stdio.h> to provide a prototype for snprintf().
    This must come before <config.h> because <config.h> may include
@@ -40,7 +40,7 @@
 #include <stdlib.h>	/* abort(), malloc(), realloc(), free() */
 #include <string.h>	/* memcpy(), strlen() */
 #include <errno.h>	/* errno */
-#include <limits.h>	/* CHAR_BIT */
+#include <limits.h>	/* CHAR_BIT, INT_MAX */
 #include <float.h>	/* DBL_MAX_EXP, LDBL_MAX_EXP */
 #if WIDE_CHAR_VERSION
 # include "wprintf-parse.h"
@@ -51,6 +51,11 @@
 /* Checked size_t computations.  */
 #include "xsize.h"
 
+/* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW.  */
+#ifndef EOVERFLOW
+# define EOVERFLOW E2BIG
+#endif
+
 #ifdef HAVE_WCHAR_T
 # ifdef HAVE_WCSLEN
 #  define local_wcslen wcslen
@@ -862,8 +867,19 @@ VASNPRINTF (CHAR_T *resultbuf, size_t *lengthp, const CHAR_T *format, va_list ar
       free (buf_malloced);
     CLEANUP ();
     *lengthp = length;
+    if (length > INT_MAX)
+      goto length_overflow;
     return result;
 
+  length_overflow:
+    /* We could produce such a big string, but its length doesn't fit into
+       an 'int'.  POSIX says that snprintf() fails with errno = EOVERFLOW in
+       this case.  */
+    if (result != resultbuf)
+      free (result);
+    errno = EOVERFLOW;
+    return NULL;
+
   out_of_memory:
     if (!(result == resultbuf || result == NULL))
       free (result);