*printf: Add support for MSVC compiler. * m4/printf.m4 (gl_PRINTF_DIRECTIVE_N): On MSVC, install a handler that handles the exception caused by the %n directive. When cross-compiling, guess no on native Windows. (gl_SNPRINTF_TRUNCATION_C99, gl_SNPRINTF_RETVAL_C99, gl_SNPRINTF_DIRECTIVE_N, gl_SNPRINTF_SIZE1): When snprintf is missing, emulate it through vsnprintf. * m4/vsnprintf-posix.m4 (gl_FUNC_VSNPRINTF_POSIX): Update comment. * doc/posix-functions/dprintf.texi: Update documentation regarding MSVC 9. * doc/posix-functions/fprintf.texi: Likewise. * doc/posix-functions/printf.texi: Likewise. * doc/posix-functions/snprintf.texi: Likewise. * doc/posix-functions/sprintf.texi: Likewise. * doc/posix-functions/swprintf.texi: Likewise. * doc/posix-functions/vdprintf.texi: Likewise. * doc/posix-functions/vfprintf.texi: Likewise. * doc/posix-functions/vprintf.texi: Likewise. * doc/posix-functions/vsnprintf.texi: Likewise. * doc/posix-functions/vsprintf.texi: Likewise. * doc/glibc-functions/asprintf.texi: Likewise. * doc/glibc-functions/obstack_printf.texi: Likewise. * doc/glibc-functions/obstack_vprintf.texi: Likewise. * doc/glibc-functions/vasprintf.texi: Likewise.

--- a/m4/vsnprintf-posix.m4
+++ b/m4/vsnprintf-posix.m4
@@ -1,4 +1,4 @@
-# vsnprintf-posix.m4 serial 14
+# vsnprintf-posix.m4 serial 15
 dnl Copyright (C) 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,
@@ -23,7 +23,7 @@
   gl_cv_func_vsnprintf_posix=no
   AC_CHECK_FUNCS([vsnprintf])
   if test $ac_cv_func_vsnprintf = yes; then
-    dnl Assume that if vsnprintf() exists, snprintf() also exists.
+    dnl These tests use vsnprintf() if snprintf() does not exist.
     gl_SNPRINTF_TRUNCATION_C99
     gl_SNPRINTF_RETVAL_C99
     gl_SNPRINTF_DIRECTIVE_N