1# mbsrtowcs.m4 serial 13
2dnl Copyright (C) 2008-2020 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7AC_DEFUN([gl_FUNC_MBSRTOWCS],
8[
9  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
10
11  AC_REQUIRE([AC_TYPE_MBSTATE_T])
12  gl_MBSTATE_T_BROKEN
13
14  AC_CHECK_FUNCS_ONCE([mbsrtowcs])
15  if test $ac_cv_func_mbsrtowcs = no; then
16    HAVE_MBSRTOWCS=0
17    AC_CHECK_DECLS([mbsrtowcs],,, [[
18/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
19   <wchar.h>.
20   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
21   included before <wchar.h>.  */
22#include <stddef.h>
23#include <stdio.h>
24#include <time.h>
25#include <wchar.h>
26]])
27    if test $ac_cv_have_decl_mbsrtowcs = yes; then
28      dnl On Minix 3.1.8, the system's <wchar.h> declares mbsrtowcs() although
29      dnl it does not have the function. Avoid a collision with gnulib's
30      dnl replacement.
31      REPLACE_MBSRTOWCS=1
32    fi
33  else
34    if test $REPLACE_MBSTATE_T = 1; then
35      REPLACE_MBSRTOWCS=1
36    else
37      gl_MBSRTOWCS_WORKS
38      case "$gl_cv_func_mbsrtowcs_works" in
39        *yes) ;;
40        *) REPLACE_MBSRTOWCS=1 ;;
41      esac
42    fi
43  fi
44])
45
46dnl Test whether mbsrtowcs works.
47dnl Result is gl_cv_func_mbsrtowcs_works.
48
49AC_DEFUN([gl_MBSRTOWCS_WORKS],
50[
51  AC_REQUIRE([AC_PROG_CC])
52  AC_REQUIRE([gt_LOCALE_FR])
53  AC_REQUIRE([gt_LOCALE_FR_UTF8])
54  AC_REQUIRE([gt_LOCALE_JA])
55  AC_REQUIRE([gt_LOCALE_ZH_CN])
56  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
57  AC_CACHE_CHECK([whether mbsrtowcs works],
58    [gl_cv_func_mbsrtowcs_works],
59    [
60      dnl Initial guess, used when cross-compiling or when no suitable locale
61      dnl is present.
62changequote(,)dnl
63      case "$host_os" in
64                                   # Guess no on HP-UX, Solaris, mingw.
65        hpux* | solaris* | mingw*) gl_cv_func_mbsrtowcs_works="guessing no" ;;
66                                   # Guess yes otherwise.
67        *)                         gl_cv_func_mbsrtowcs_works="guessing yes" ;;
68      esac
69changequote([,])dnl
70      if test $LOCALE_FR != none || test $LOCALE_FR_UTF8 != none || test $LOCALE_JA != none || test $LOCALE_ZH_CN != none; then
71        AC_RUN_IFELSE(
72          [AC_LANG_SOURCE([[
73#include <locale.h>
74#include <string.h>
75/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
76   <wchar.h>.
77   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
78   included before <wchar.h>.  */
79#include <stddef.h>
80#include <stdio.h>
81#include <time.h>
82#include <wchar.h>
83int main ()
84{
85  int result = 0;
86  /* Test whether the function supports a NULL destination argument.
87     This fails on native Windows.  */
88  if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
89    {
90      const char input[] = "\337er";
91      const char *src = input;
92      mbstate_t state;
93
94      memset (&state, '\0', sizeof (mbstate_t));
95      if (mbsrtowcs (NULL, &src, 1, &state) != 3
96          || src != input)
97        result |= 1;
98    }
99  /* Test whether the function works when started with a conversion state
100     in non-initial state.  This fails on HP-UX 11.11 and Solaris 10.  */
101  if (setlocale (LC_ALL, "$LOCALE_FR_UTF8") != NULL)
102    {
103      const char input[] = "B\303\274\303\237er";
104      mbstate_t state;
105
106      memset (&state, '\0', sizeof (mbstate_t));
107      if (mbrtowc (NULL, input + 1, 1, &state) == (size_t)(-2))
108        if (!mbsinit (&state))
109          {
110            const char *src = input + 2;
111            if (mbsrtowcs (NULL, &src, 10, &state) != 4)
112              result |= 2;
113          }
114    }
115  if (setlocale (LC_ALL, "$LOCALE_JA") != NULL)
116    {
117      const char input[] = "<\306\374\313\334\270\354>";
118      mbstate_t state;
119
120      memset (&state, '\0', sizeof (mbstate_t));
121      if (mbrtowc (NULL, input + 3, 1, &state) == (size_t)(-2))
122        if (!mbsinit (&state))
123          {
124            const char *src = input + 4;
125            if (mbsrtowcs (NULL, &src, 10, &state) != 3)
126              result |= 4;
127          }
128    }
129  if (setlocale (LC_ALL, "$LOCALE_ZH_CN") != NULL)
130    {
131      const char input[] = "B\250\271\201\060\211\070er";
132      mbstate_t state;
133
134      memset (&state, '\0', sizeof (mbstate_t));
135      if (mbrtowc (NULL, input + 1, 1, &state) == (size_t)(-2))
136        if (!mbsinit (&state))
137          {
138            const char *src = input + 2;
139            if (mbsrtowcs (NULL, &src, 10, &state) != 4)
140              result |= 8;
141          }
142    }
143  return result;
144}]])],
145          [gl_cv_func_mbsrtowcs_works=yes],
146          [gl_cv_func_mbsrtowcs_works=no],
147          [:])
148      fi
149    ])
150])
151
152# Prerequisites of lib/mbsrtowcs.c.
153AC_DEFUN([gl_PREREQ_MBSRTOWCS], [
154  :
155])
156