summaryrefslogtreecommitdiff
path: root/m4/btowc.m4
blob: c4ee4e41970d702254b6538a276cea38c1ebbd4a (plain)
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
# btowc.m4 serial 6
dnl Copyright (C) 2008-2010 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 <http://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_TRY_RUN([
#include <stdio.h>
#include <string.h>
#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 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 otherwise.
          *)     gl_cv_func_btowc_eof="guessing yes" ;;
        esac
changequote([,])dnl
        if test $LOCALE_FR != none; then
          AC_TRY_RUN([
#include <locale.h>
#include <stdio.h>
#include <string.h>
#include <wchar.h>
int main ()
{
  if (setlocale (LC_ALL, "$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
  if test $HAVE_BTOWC = 0 || test $REPLACE_BTOWC = 1; then
    gl_REPLACE_WCHAR_H
    AC_LIBOBJ([btowc])
    gl_PREREQ_BTOWC
  fi
])

# Prerequisites of lib/btowc.c.
AC_DEFUN([gl_PREREQ_BTOWC], [
  :
])