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# mbrtoc32.m4 serial 18
dnl Copyright (C) 2014-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_MBRTOC32],
[
AC_REQUIRE([gl_UCHAR_H_DEFAULTS])
AC_REQUIRE([AC_TYPE_MBSTATE_T])
dnl Determine REPLACE_MBSTATE_T, from which GNULIB_defined_mbstate_t is
dnl determined. It describes how our overridden mbrtowc is implemented.
dnl We then implement mbrtoc32 accordingly.
AC_REQUIRE([gl_MBSTATE_T_BROKEN])
AC_REQUIRE([gl_TYPE_CHAR32_T])
AC_REQUIRE([gl_MBRTOC32_SANITYCHECK])
AC_REQUIRE([gl_CHECK_FUNC_MBRTOC32])
if test $gl_cv_func_mbrtoc32 = no; then
HAVE_MBRTOC32=0
else
if test $GNULIBHEADERS_OVERRIDE_CHAR32_T = 1 || test $REPLACE_MBSTATE_T = 1; then
REPLACE_MBRTOC32=1
else
gl_MBRTOC32_EMPTY_INPUT
gl_MBRTOC32_C_LOCALE
case "$gl_cv_func_mbrtoc32_empty_input" in
*yes) ;;
*) AC_DEFINE([MBRTOC32_EMPTY_INPUT_BUG], [1],
[Define if the mbrtoc32 function does not return (size_t) -2 for empty input.])
REPLACE_MBRTOC32=1
;;
esac
case "$gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ" in
*yes) ;;
*) AC_DEFINE([MBRTOC32_IN_C_LOCALE_MAYBE_EILSEQ], [1],
[Define if the mbrtoc32 function may signal encoding errors in the C locale.])
REPLACE_MBRTOC32=1
;;
esac
fi
if test $HAVE_WORKING_MBRTOC32 = 0; then
REPLACE_MBRTOC32=1
fi
fi
])
AC_DEFUN([gl_CHECK_FUNC_MBRTOC32],
[
dnl Cf. gl_CHECK_FUNCS_ANDROID
AC_CHECK_DECL([mbrtoc32], , ,
[[#ifdef __HAIKU__
#include <stdint.h>
#endif
#include <uchar.h>
]])
if test $ac_cv_have_decl_mbrtoc32 = yes; then
dnl We can't use AC_CHECK_FUNC here, because mbrtoc32() is defined as a
dnl static inline function on Haiku 2020.
AC_CACHE_CHECK([for mbrtoc32], [gl_cv_func_mbrtoc32],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#ifdef __HAIKU__
#include <stdint.h>
#endif
#include <uchar.h>
]],
[[char32_t c;
return mbrtoc32 (&c, "", 1, NULL) == 0;
]])
],
[gl_cv_func_mbrtoc32=yes],
[gl_cv_func_mbrtoc32=no])
])
else
gl_cv_func_mbrtoc32=no
fi
])
dnl Test whether mbrtoc32 returns the correct value on empty input.
AC_DEFUN([gl_MBRTOC32_EMPTY_INPUT],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether mbrtoc32 works on empty input],
[gl_cv_func_mbrtoc32_empty_input],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifdef __HAIKU__
#include <stdint.h>
#endif
#include <uchar.h>
static char32_t wc;
static mbstate_t mbs;
int
main (void)
{
return mbrtoc32 (&wc, "", 0, &mbs) != (size_t) -2;
}]])],
[gl_cv_func_mbrtoc32_empty_input=yes],
[gl_cv_func_mbrtoc32_empty_input=no],
[case "$host_os" in
# Guess no on glibc systems.
*-gnu* | gnu*) gl_cv_func_mbrtoc32_empty_input="guessing no" ;;
# Guess no on Android.
linux*-android*) gl_cv_func_mbrtoc32_empty_input="guessing no" ;;
# Guess no on native Windows.
mingw* | windows*) gl_cv_func_mbrtoc32_empty_input="guessing no" ;;
*) gl_cv_func_mbrtoc32_empty_input="guessing yes" ;;
esac
])
])
])
dnl <https://pubs.opengroup.org/onlinepubs/9699919799/functions/mbrtowc.html>
dnl POSIX:2018 says regarding mbrtowc: "In the POSIX locale an [EILSEQ] error
dnl cannot occur since all byte values are valid characters." It is reasonable
dnl to expect mbrtoc32 to behave in the same way.
AC_DEFUN([gl_MBRTOC32_C_LOCALE],
[
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether the C locale is free of encoding errors],
[gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <limits.h>
#include <locale.h>
#ifdef __HAIKU__
#include <stdint.h>
#endif
#include <uchar.h>
]], [[
int i;
char *locale = setlocale (LC_ALL, "C");
if (! locale)
return 2;
for (i = CHAR_MIN; i <= CHAR_MAX; i++)
{
char c = i;
char32_t wc;
mbstate_t mbs = { 0, };
size_t ss = mbrtoc32 (&wc, &c, 1, &mbs);
if (1 < ss)
return 3;
}
return 0;
]])],
[gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ=yes],
[gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ=no],
[case "$host_os" in
# Guess yes on native Windows.
mingw* | windows*) gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ="guessing yes" ;;
*) gl_cv_func_mbrtoc32_C_locale_sans_EILSEQ="$gl_cross_guess_normal" ;;
esac
])
])
])
dnl Test whether mbrtoc32 works not worse than mbrtowc.
dnl Result is HAVE_WORKING_MBRTOC32.
AC_DEFUN([gl_MBRTOC32_SANITYCHECK],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([gl_TYPE_CHAR32_T])
AC_REQUIRE([gl_CHECK_FUNC_MBRTOC32])
AC_REQUIRE([gt_LOCALE_FR])
AC_REQUIRE([gt_LOCALE_ZH_CN])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
if test $GNULIBHEADERS_OVERRIDE_CHAR32_T = 1 || test $gl_cv_func_mbrtoc32 = no; then
HAVE_WORKING_MBRTOC32=0
else
AC_CACHE_CHECK([whether mbrtoc32 works as well as mbrtowc],
[gl_cv_func_mbrtoc32_sanitycheck],
[
dnl Initial guess, used when cross-compiling or when no suitable locale
dnl is present.
changequote(,)dnl
case "$host_os" in
# Guess no on FreeBSD, Solaris, native Windows.
freebsd* | midnightbsd* | solaris* | mingw* | windows*)
gl_cv_func_mbrtoc32_sanitycheck="guessing no"
;;
# Guess yes otherwise.
*)
gl_cv_func_mbrtoc32_sanitycheck="guessing yes"
;;
esac
changequote([,])dnl
if test $LOCALE_FR != none || test $LOCALE_ZH_CN != none; then
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#ifdef __HAIKU__
#include <stdint.h>
#endif
#include <uchar.h>
int main ()
{
int result = 0;
/* This fails on native Windows:
mbrtoc32 returns (size_t)-1.
mbrtowc returns 1 (correct). */
if (strcmp ("$LOCALE_FR", "none") != 0
&& setlocale (LC_ALL, "$LOCALE_FR") != NULL)
{
mbstate_t state;
wchar_t wc = (wchar_t) 0xBADFACE;
memset (&state, '\0', sizeof (mbstate_t));
if (mbrtowc (&wc, "\374", 1, &state) == 1)
{
char32_t c32 = (wchar_t) 0xBADFACE;
memset (&state, '\0', sizeof (mbstate_t));
if (mbrtoc32 (&c32, "\374", 1, &state) != 1)
result |= 1;
}
}
/* This fails on FreeBSD 13.0 and Solaris 11.4:
mbrtoc32 returns (size_t)-2 or (size_t)-1.
mbrtowc returns 4 (correct). */
if (strcmp ("$LOCALE_ZH_CN", "none") != 0
&& setlocale (LC_ALL, "$LOCALE_ZH_CN") != NULL)
{
mbstate_t state;
wchar_t wc = (wchar_t) 0xBADFACE;
memset (&state, '\0', sizeof (mbstate_t));
if (mbrtowc (&wc, "\224\071\375\067", 4, &state) == 4)
{
char32_t c32 = (wchar_t) 0xBADFACE;
memset (&state, '\0', sizeof (mbstate_t));
if (mbrtoc32 (&c32, "\224\071\375\067", 4, &state) != 4)
result |= 2;
}
}
return result;
}]])],
[gl_cv_func_mbrtoc32_sanitycheck=yes],
[gl_cv_func_mbrtoc32_sanitycheck=no],
[:])
fi
])
case "$gl_cv_func_mbrtoc32_sanitycheck" in
*yes)
HAVE_WORKING_MBRTOC32=1
AC_DEFINE([HAVE_WORKING_MBRTOC32], [1],
[Define if the mbrtoc32 function basically works.])
;;
*) HAVE_WORKING_MBRTOC32=0 ;;
esac
fi
AC_SUBST([HAVE_WORKING_MBRTOC32])
])
# Prerequisites of lib/mbrtoc32.c and lib/lc-charset-dispatch.c.
AC_DEFUN([gl_PREREQ_MBRTOC32], [
:
])
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