strerror_r-posix: Avoid a link error on MSVC.

* m4/strerror_r.m4 (gl_PREREQ_STRERROR_R): Check for snprintf.
* lib/strerror_r.c (snprintf): Define to _snprintf if it doesn't exist.

diff --git a/ChangeLog b/ChangeLog
index 3af8904..9c713cd 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2011-09-22  Bruno Haible  <bruno@clisp.org>
 
+       strerror_r-posix: Avoid a link error on MSVC.
+       * m4/strerror_r.m4 (gl_PREREQ_STRERROR_R): Check for snprintf.
+       * lib/strerror_r.c (snprintf): Define to _snprintf if it doesn't exist.
+
+2011-09-22  Bruno Haible  <bruno@clisp.org>
+
        select: Avoid link errors on MSVC.
        * m4/select.m4 (gl_FUNC_SELECT): Determine LIB_SELECT.
        * modules/select (Link): Replace $(LIBSOCKET) with $(LIB_SELECT).

diff --git a/lib/strerror_r.c b/lib/strerror_r.c
index 2b3f1f2..7fd90b7 100644 (file)
--- a/lib/strerror_r.c
+++ b/lib/strerror_r.c
@@ -86,6 +86,12 @@ gl_lock_define_initialized(static, strerror_lock)
 
 #endif
 
+/* On MSVC, there is no snprintf() function, just a _snprintf().
+   It is of lower quality, but sufficient for the simple use here.  */
+#if !HAVE_SNPRINTF
+# define snprintf _snprintf
+#endif
+
 /* Copy as much of MSG into BUF as possible, without corrupting errno.
    Return 0 if MSG fit in BUFLEN, otherwise return ERANGE.  */
 static int

diff --git a/m4/strerror_r.m4 b/m4/strerror_r.m4
index 0c5cc69..1d4a653 100644 (file)
--- a/m4/strerror_r.m4
+++ b/m4/strerror_r.m4
@@ -1,4 +1,4 @@
-# strerror_r.m4 serial 13
+# strerror_r.m4 serial 14
 dnl Copyright (C) 2002, 2007-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -43,6 +43,7 @@ AC_DEFUN([gl_PREREQ_STRERROR_R], [
   dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
   AC_CHECK_FUNCS_ONCE([__xpg_strerror_r])
   AC_CHECK_FUNCS_ONCE([catgets])
+  AC_CHECK_FUNCS_ONCE([snprintf])
 ])
 
 # Detect if strerror_r works, but without affecting whether a replacement