1 # wcsrtombs.m4 serial 13
2 dnl Copyright (C) 2008-2021 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_WCSRTOMBS],
9 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
11 AC_REQUIRE([AC_TYPE_MBSTATE_T])
14 AC_CHECK_FUNCS_ONCE([wcsrtombs])
15 if test $ac_cv_func_wcsrtombs = no; then
17 AC_CHECK_DECLS([wcsrtombs],,, [[
20 if test $ac_cv_have_decl_wcsrtombs = yes; then
21 dnl On Minix 3.1.8, the system's <wchar.h> declares wcsrtombs() although
22 dnl it does not have the function. Avoid a collision with gnulib's
27 if test $REPLACE_MBSTATE_T = 1; then
30 gl_WCSRTOMBS_TERMINATION
32 case "$gl_cv_func_wcsrtombs_termination" in
34 *) AC_DEFINE([WCSRTOMBS_TERMINATION_BUG], [1],
35 [Define if the wcsrtombs function may set the source pointer to NULL without NUL-terminating the destination.])
36 REPLACE_WCSRTOMBS=1 ;;
38 case "$gl_cv_func_wcsrtombs_null" in
40 *) AC_DEFINE([WCSRTOMBS_NULL_ARG_BUG], [1],
41 [Define if the wcsrtombs function has the NULL destination argument bug.])
42 REPLACE_WCSRTOMBS=1 ;;
48 dnl Test whether the wcsrtombs implementation stores a non-NULL source pointer
49 dnl as long as it has not written the final NUL byte to the destination string.
50 dnl The OSF/1 5.1 implementation stores a NULL pointer already after storing
51 dnl the last non-NUL character, even if there is no more room for the
52 dnl terminating NUL character.
53 dnl Result is gl_cv_func_wcsrtombs_termination.
55 AC_DEFUN([gl_WCSRTOMBS_TERMINATION],
57 AC_REQUIRE([AC_PROG_CC])
58 AC_REQUIRE([gt_LOCALE_FR])
59 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
60 AC_CACHE_CHECK([whether wcsrtombs updates the source pointer correctly],
61 [gl_cv_func_wcsrtombs_termination],
63 dnl Initial guess, used when cross-compiling or when no suitable locale
68 osf*) gl_cv_func_wcsrtombs_termination="guessing no" ;;
69 # Guess yes on native Windows.
70 mingw*) gl_cv_func_wcsrtombs_termination="guessing yes" ;;
71 # Guess yes otherwise.
72 *) gl_cv_func_wcsrtombs_termination="guessing yes" ;;
75 if test $LOCALE_FR != none; then
83 if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
85 const char original[] = "B\374\337er";
88 if (mbstowcs (input, original, 10) == 5)
90 const wchar_t *src = input;
92 wcsrtombs (output, &src, 5, NULL);
99 [gl_cv_func_wcsrtombs_termination=yes],
100 [gl_cv_func_wcsrtombs_termination=no],
106 dnl Test whether the wcsrtombs implementation supports a NULL argument
107 dnl correctly. This is not the case on HP-UX 11.11 and OSF/1 5.1: These
108 dnl implementations updates the source pointer also if the destination argument
110 dnl Result is gl_cv_func_wcsrtombs_null.
112 AC_DEFUN([gl_WCSRTOMBS_NULL],
114 AC_REQUIRE([AC_PROG_CC])
115 AC_REQUIRE([gt_LOCALE_FR])
116 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
117 AC_CACHE_CHECK([whether wcsrtombs supports a NULL argument correctly],
118 [gl_cv_func_wcsrtombs_null],
120 dnl Initial guess, used when cross-compiling or when no suitable locale
124 # Guess no on HP-UX, OSF/1, mingw.
125 hpux* | osf* | mingw*) gl_cv_func_wcsrtombs_null="guessing no" ;;
126 # Guess yes on native Windows.
127 mingw*) gl_cv_func_wcsrtombs_null="guessing yes" ;;
128 # Guess yes otherwise.
129 *) gl_cv_func_wcsrtombs_null="guessing yes" ;;
132 if test $LOCALE_FR != none; then
141 if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
143 const char original[] = "B\374\337er";
146 if (mbstowcs (input, original, 10) == 5)
148 const wchar_t *src = input;
149 size_t ret = wcsrtombs (NULL, &src, 3, NULL);
158 [gl_cv_func_wcsrtombs_null=yes],
159 [gl_cv_func_wcsrtombs_null=no],
165 # Prerequisites of lib/wcsrtombs.c.
166 AC_DEFUN([gl_PREREQ_WCSRTOMBS], [