summaryrefslogtreecommitdiffstats
path: root/m4/mbsrtowcs.m4
blob: 4f2e88c5a0b898576db241862658642fa84849d8 (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
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
# mbsrtowcs.m4 serial 15
dnl Copyright (C) 2008-2023 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_MBSRTOWCS],
[
  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])

  AC_REQUIRE([AC_TYPE_MBSTATE_T])
  gl_MBSTATE_T_BROKEN

  AC_CHECK_FUNCS_ONCE([mbsrtowcs])
  if test $ac_cv_func_mbsrtowcs = no; then
    HAVE_MBSRTOWCS=0
    AC_CHECK_DECLS([mbsrtowcs],,, [[
      #include <wchar.h>
    ]])
    if test $ac_cv_have_decl_mbsrtowcs = yes; then
      dnl On Minix 3.1.8, the system's <wchar.h> declares mbsrtowcs() although
      dnl it does not have the function. Avoid a collision with gnulib's
      dnl replacement.
      REPLACE_MBSRTOWCS=1
    fi
  else
    if test $REPLACE_MBSTATE_T = 1; then
      REPLACE_MBSRTOWCS=1
    else
      gl_MBSRTOWCS_WORKS
      case "$gl_cv_func_mbsrtowcs_works" in
        *yes) ;;
        *) REPLACE_MBSRTOWCS=1 ;;
      esac
      if test $REPLACE_MBSRTOWCS = 0; then
        gl_MBRTOWC_C_LOCALE
        case "$gl_cv_func_mbrtowc_C_locale_sans_EILSEQ" in
          *yes) ;;
          *) REPLACE_MBSRTOWCS=1 ;;
        esac
      fi
    fi
  fi
])

dnl Test whether mbsrtowcs works.
dnl Result is gl_cv_func_mbsrtowcs_works.

AC_DEFUN([gl_MBSRTOWCS_WORKS],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([gt_LOCALE_FR])
  AC_REQUIRE([gt_LOCALE_FR_UTF8])
  AC_REQUIRE([gt_LOCALE_JA])
  AC_REQUIRE([gt_LOCALE_ZH_CN])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether mbsrtowcs works],
    [gl_cv_func_mbsrtowcs_works],
    [
      dnl Initial guess, used when cross-compiling or when no suitable locale
      dnl is present.
changequote(,)dnl
      case "$host_os" in
                                   # Guess no on HP-UX, Solaris, mingw.
        hpux* | solaris* | mingw*) gl_cv_func_mbsrtowcs_works="guessing no" ;;
                                   # Guess yes otherwise.
        *)                         gl_cv_func_mbsrtowcs_works="guessing yes" ;;
      esac
changequote([,])dnl
      if test $LOCALE_FR != none || test $LOCALE_FR_UTF8 != none || test $LOCALE_JA != none || test $LOCALE_ZH_CN != none; then
        AC_RUN_IFELSE(
          [AC_LANG_SOURCE([[
#include <locale.h>
#include <string.h>
#include <wchar.h>
int main ()
{
  int result = 0;
  /* Test whether the function supports a NULL destination argument.
     This fails on native Windows.  */
  if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
    {
      const char input[] = "\337er";
      const char *src = input;
      mbstate_t state;

      memset (&state, '\0', sizeof (mbstate_t));
      if (mbsrtowcs (NULL, &src, 1, &state) != 3
          || src != input)
        result |= 1;
    }
  /* Test whether the function works when started with a conversion state
     in non-initial state.  This fails on HP-UX 11.11 and Solaris 10.  */
  if (setlocale (LC_ALL, "$LOCALE_FR_UTF8") != NULL)
    {
      const char input[] = "B\303\274\303\237er";
      mbstate_t state;

      memset (&state, '\0', sizeof (mbstate_t));
      if (mbrtowc (NULL, input + 1, 1, &state) == (size_t)(-2))
        if (!mbsinit (&state))
          {
            const char *src = input + 2;
            if (mbsrtowcs (NULL, &src, 10, &state) != 4)
              result |= 2;
          }
    }
  if (setlocale (LC_ALL, "$LOCALE_JA") != NULL)
    {
      const char input[] = "<\306\374\313\334\270\354>";
      mbstate_t state;

      memset (&state, '\0', sizeof (mbstate_t));
      if (mbrtowc (NULL, input + 3, 1, &state) == (size_t)(-2))
        if (!mbsinit (&state))
          {
            const char *src = input + 4;
            if (mbsrtowcs (NULL, &src, 10, &state) != 3)
              result |= 4;
          }
    }
  if (setlocale (LC_ALL, "$LOCALE_ZH_CN") != NULL)
    {
      const char input[] = "B\250\271\201\060\211\070er";
      mbstate_t state;

      memset (&state, '\0', sizeof (mbstate_t));
      if (mbrtowc (NULL, input + 1, 1, &state) == (size_t)(-2))
        if (!mbsinit (&state))
          {
            const char *src = input + 2;
            if (mbsrtowcs (NULL, &src, 10, &state) != 4)
              result |= 8;
          }
    }
  return result;
}]])],
          [gl_cv_func_mbsrtowcs_works=yes],
          [gl_cv_func_mbsrtowcs_works=no],
          [:])
      fi
    ])
])

# Prerequisites of lib/mbsrtowcs.c.
AC_DEFUN([gl_PREREQ_MBSRTOWCS], [
  :
])