1# mbsrtowcs.m4 serial 14
2dnl Copyright (C) 2008-2021 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      #include <wchar.h>
19    ]])
20    if test $ac_cv_have_decl_mbsrtowcs = yes; then
21      dnl On Minix 3.1.8, the system's <wchar.h> declares mbsrtowcs() although
22      dnl it does not have the function. Avoid a collision with gnulib's
23      dnl replacement.
24      REPLACE_MBSRTOWCS=1
25    fi
26  else
27    if test $REPLACE_MBSTATE_T = 1; then
28      REPLACE_MBSRTOWCS=1
29    else
30      gl_MBSRTOWCS_WORKS
31      case "$gl_cv_func_mbsrtowcs_works" in
32        *yes) ;;
33        *) REPLACE_MBSRTOWCS=1 ;;
34      esac
35    fi
36  fi
37])
38
39dnl Test whether mbsrtowcs works.
40dnl Result is gl_cv_func_mbsrtowcs_works.
41
42AC_DEFUN([gl_MBSRTOWCS_WORKS],
43[
44  AC_REQUIRE([AC_PROG_CC])
45  AC_REQUIRE([gt_LOCALE_FR])
46  AC_REQUIRE([gt_LOCALE_FR_UTF8])
47  AC_REQUIRE([gt_LOCALE_JA])
48  AC_REQUIRE([gt_LOCALE_ZH_CN])
49  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
50  AC_CACHE_CHECK([whether mbsrtowcs works],
51    [gl_cv_func_mbsrtowcs_works],
52    [
53      dnl Initial guess, used when cross-compiling or when no suitable locale
54      dnl is present.
55changequote(,)dnl
56      case "$host_os" in
57                                   # Guess no on HP-UX, Solaris, mingw.
58        hpux* | solaris* | mingw*) gl_cv_func_mbsrtowcs_works="guessing no" ;;
59                                   # Guess yes otherwise.
60        *)                         gl_cv_func_mbsrtowcs_works="guessing yes" ;;
61      esac
62changequote([,])dnl
63      if test $LOCALE_FR != none || test $LOCALE_FR_UTF8 != none || test $LOCALE_JA != none || test $LOCALE_ZH_CN != none; then
64        AC_RUN_IFELSE(
65          [AC_LANG_SOURCE([[
66#include <locale.h>
67#include <string.h>
68#include <wchar.h>
69int main ()
70{
71  int result = 0;
72  /* Test whether the function supports a NULL destination argument.
73     This fails on native Windows.  */
74  if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
75    {
76      const char input[] = "\337er";
77      const char *src = input;
78      mbstate_t state;
79
80      memset (&state, '\0', sizeof (mbstate_t));
81      if (mbsrtowcs (NULL, &src, 1, &state) != 3
82          || src != input)
83        result |= 1;
84    }
85  /* Test whether the function works when started with a conversion state
86     in non-initial state.  This fails on HP-UX 11.11 and Solaris 10.  */
87  if (setlocale (LC_ALL, "$LOCALE_FR_UTF8") != NULL)
88    {
89      const char input[] = "B\303\274\303\237er";
90      mbstate_t state;
91
92      memset (&state, '\0', sizeof (mbstate_t));
93      if (mbrtowc (NULL, input + 1, 1, &state) == (size_t)(-2))
94        if (!mbsinit (&state))
95          {
96            const char *src = input + 2;
97            if (mbsrtowcs (NULL, &src, 10, &state) != 4)
98              result |= 2;
99          }
100    }
101  if (setlocale (LC_ALL, "$LOCALE_JA") != NULL)
102    {
103      const char input[] = "<\306\374\313\334\270\354>";
104      mbstate_t state;
105
106      memset (&state, '\0', sizeof (mbstate_t));
107      if (mbrtowc (NULL, input + 3, 1, &state) == (size_t)(-2))
108        if (!mbsinit (&state))
109          {
110            const char *src = input + 4;
111            if (mbsrtowcs (NULL, &src, 10, &state) != 3)
112              result |= 4;
113          }
114    }
115  if (setlocale (LC_ALL, "$LOCALE_ZH_CN") != NULL)
116    {
117      const char input[] = "B\250\271\201\060\211\070er";
118      mbstate_t state;
119
120      memset (&state, '\0', sizeof (mbstate_t));
121      if (mbrtowc (NULL, input + 1, 1, &state) == (size_t)(-2))
122        if (!mbsinit (&state))
123          {
124            const char *src = input + 2;
125            if (mbsrtowcs (NULL, &src, 10, &state) != 4)
126              result |= 8;
127          }
128    }
129  return result;
130}]])],
131          [gl_cv_func_mbsrtowcs_works=yes],
132          [gl_cv_func_mbsrtowcs_works=no],
133          [:])
134      fi
135    ])
136])
137
138# Prerequisites of lib/mbsrtowcs.c.
139AC_DEFUN([gl_PREREQ_MBSRTOWCS], [
140  :
141])
142