1 # vsnprintf-posix.m4 serial 1
2 dnl Copyright (C) 2007 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_VSNPRINTF_POSIX],
9 AC_REQUIRE([gl_EOVERFLOW])
10 AC_REQUIRE([gl_PRINTF_SIZES_C99])
11 AC_REQUIRE([gl_PRINTF_DIRECTIVE_A])
12 AC_REQUIRE([gl_PRINTF_DIRECTIVE_N])
13 AC_REQUIRE([gl_PRINTF_POSITIONS])
14 gl_cv_func_vsnprintf_posix=no
15 AC_CHECK_FUNCS([vsnprintf])
16 if test $ac_cv_func_vsnprintf = yes; then
17 dnl Assume that if vsnprintf() exists, snprintf() also exists.
18 gl_SNPRINTF_TRUNCATION_C99
19 gl_SNPRINTF_RETVAL_C99
20 gl_SNPRINTF_DIRECTIVE_N
21 if expr "$gl_cv_func_printf_sizes_c99" : ".*yes" > /dev/null \
22 && expr "$gl_cv_func_printf_directive_a" : ".*yes" > /dev/null \
23 && expr "$gl_cv_func_printf_directive_n" : ".*yes" > /dev/null \
24 && expr "$gl_cv_func_printf_positions" : ".*yes" > /dev/null \
25 && expr "$gl_cv_func_snprintf_truncation_c99" : ".*yes" > /dev/null \
26 && expr "$gl_cv_func_snprintf_retval_c99" : ".*yes" > /dev/null \
27 && expr "$gl_cv_func_snprintf_directive_n" : ".*yes" > /dev/null; then
28 # vsnprintf exists and is already POSIX compliant.
29 gl_cv_func_vsnprintf_posix=yes
32 if test $gl_cv_func_vsnprintf_posix = no; then
33 if ! expr "$gl_cv_func_printf_directive_a" : ".*yes" > /dev/null; then
34 AC_DEFINE([NEED_PRINTF_DIRECTIVE_A], 1,
35 [Define if the vasnprintf implementation needs special code for
36 the 'a' and 'A' directives.])