1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
# btowc.m4 serial 14
dnl Copyright (C) 2008-2024 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* | windows*) 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* | windows*) 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
])
dnl On mingw, in the C locale, btowc is inconsistent with mbrtowc:
dnl mbrtowc avoids calling MultiByteToWideChar when MB_CUR_MAX is 1 and
dnl ___lc_codepage_func() is 0, but btowc is lacking this special case.
AC_CHECK_FUNCS_ONCE([mbrtowc])
AC_CACHE_CHECK([whether btowc is consistent with mbrtowc in the C locale],
[gl_cv_func_btowc_consistent],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
int main ()
{
#if HAVE_MBRTOWC
wint_t wc1 = btowc (0x80);
wchar_t wc2 = (wchar_t) 0xbadface;
char buf[1] = { 0x80 };
mbstate_t state;
memset (&state, 0, sizeof (mbstate_t));
if (mbrtowc (&wc2, buf, 1, &state) != 1 || wc1 != wc2)
return 1;
#endif
return 0;
}]])],
[gl_cv_func_btowc_consistent=yes],
[gl_cv_func_btowc_consistent=no],
[case "$host_os" in
# Guess no on mingw.
mingw* | windows*)
AC_EGREP_CPP([Problem], [
#ifdef __MINGW32__
Problem
#endif
],
[gl_cv_func_btowc_consistent="guessing no"],
[gl_cv_func_btowc_consistent="guessing yes"])
;;
# Guess yes otherwise.
*) gl_cv_func_btowc_consistent="guessing yes" ;;
esac
])
])
case "$gl_cv_func_btowc_nul" in
*yes) ;;
*) REPLACE_BTOWC=1 ;;
esac
case "$gl_cv_func_btowc_eof" in
*yes) ;;
*) REPLACE_BTOWC=1 ;;
esac
case "$gl_cv_func_btowc_consistent" in
*yes) ;;
*) REPLACE_BTOWC=1 ;;
esac
if test $REPLACE_BTOWC = 0; then
gl_MBRTOWC_C_LOCALE
case "$gl_cv_func_mbrtowc_C_locale_sans_EILSEQ" in
*yes) ;;
*) REPLACE_BTOWC=1 ;;
esac
fi
fi
])
# Prerequisites of lib/btowc.c.
AC_DEFUN([gl_PREREQ_BTOWC], [
:
AC_CHECK_FUNCS_ONCE([mbrtowc])
])
|
