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# btowc.m4 serial 12
dnl Copyright (C) 2008-2021 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_BTOWC],
[
AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
dnl Check whether <wchar.h> is usable at all, first. Otherwise the test
dnl program below may lead to an endless loop. See
dnl <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>.
AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
AC_CHECK_FUNCS_ONCE([btowc])
if test $ac_cv_func_btowc = no; then
HAVE_BTOWC=0
else
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([gt_LOCALE_FR])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Cygwin 1.7.2 btowc('\0') is WEOF, not 0.
AC_CACHE_CHECK([whether btowc(0) is correct],
[gl_cv_func_btowc_nul],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <wchar.h>
int main ()
{
if (btowc ('\0') != 0)
return 1;
return 0;
}]])],
[gl_cv_func_btowc_nul=yes],
[gl_cv_func_btowc_nul=no],
[
changequote(,)dnl
case "$host_os" in
# Guess no on Cygwin.
cygwin*) gl_cv_func_btowc_nul="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_btowc_nul="guessing yes" ;;
# Guess yes otherwise.
*) gl_cv_func_btowc_nul="guessing yes" ;;
esac
changequote([,])dnl
])
])
dnl IRIX 6.5 btowc(EOF) is 0xFF, not WEOF.
AC_CACHE_CHECK([whether btowc(EOF) is correct],
[gl_cv_func_btowc_eof],
[
dnl Initial guess, used when cross-compiling or when no suitable locale
dnl is present.
changequote(,)dnl
case "$host_os" in
# Guess no on IRIX.
irix*) gl_cv_func_btowc_eof="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_btowc_eof="guessing yes" ;;
# Guess yes otherwise.
*) gl_cv_func_btowc_eof="guessing yes" ;;
esac
changequote([,])dnl
if test $LOCALE_FR != none; then
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <locale.h>
#include <stdio.h>
#include <wchar.h>
int main ()
{
if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
{
if (btowc (EOF) != WEOF)
return 1;
}
return 0;
}]])],
[gl_cv_func_btowc_eof=yes],
[gl_cv_func_btowc_eof=no],
[:])
fi
])
case "$gl_cv_func_btowc_nul" in
*yes) ;;
*) REPLACE_BTOWC=1 ;;
esac
case "$gl_cv_func_btowc_eof" in
*yes) ;;
*) REPLACE_BTOWC=1 ;;
esac
fi
])
# Prerequisites of lib/btowc.c.
AC_DEFUN([gl_PREREQ_BTOWC], [
:
])
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