summaryrefslogtreecommitdiffstats
path: root/m4/wctype_h.m4
blob: 6856a735950e36dc96e43817532573dabc5b2622 (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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
# wctype_h.m4 serial 30

dnl A placeholder for ISO C99 <wctype.h>, for platforms that lack it.

dnl Copyright (C) 2006-2023 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.

dnl Written by Paul Eggert.

AC_DEFUN_ONCE([gl_WCTYPE_H],
[
  AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST])
  AC_CHECK_FUNCS_ONCE([iswcntrl])
  if test $ac_cv_func_iswcntrl = yes; then
    HAVE_ISWCNTRL=1
  else
    HAVE_ISWCNTRL=0
  fi
  AC_SUBST([HAVE_ISWCNTRL])

  AC_REQUIRE([gt_TYPE_WINT_T])
  if test $gt_cv_c_wint_t = yes; then
    HAVE_WINT_T=1
  else
    HAVE_WINT_T=0
  fi
  AC_SUBST([HAVE_WINT_T])

  AC_REQUIRE([gl_TYPE_WINT_T_PREREQ])

  gl_CHECK_NEXT_HEADERS([wctype.h])
  if test $ac_cv_header_wctype_h = yes; then
    if test $ac_cv_func_iswcntrl = yes; then
      dnl Linux libc5 has an iswprint function that returns 0 for all arguments.
      dnl The other functions are likely broken in the same way.
      AC_CACHE_CHECK([whether iswcntrl works], [gl_cv_func_iswcntrl_works],
        [
          AC_RUN_IFELSE(
            [AC_LANG_SOURCE([[
               #include <wchar.h>
               #include <wctype.h>
               int main () { return iswprint ('x') == 0; }
            ]])],
            [gl_cv_func_iswcntrl_works=yes], [gl_cv_func_iswcntrl_works=no],
            [dnl Guess no on Linux libc5, yes otherwise.
             AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdlib.h>
                          #if __GNU_LIBRARY__ == 1
                          Linux libc5 i18n is broken.
                          #endif]], [[]])],
              [gl_cv_func_iswcntrl_works="guessing yes"],
              [gl_cv_func_iswcntrl_works="guessing no"])
            ])
        ])
    fi
    HAVE_WCTYPE_H=1
  else
    HAVE_WCTYPE_H=0
  fi
  AC_SUBST([HAVE_WCTYPE_H])

  if test $GNULIBHEADERS_OVERRIDE_WINT_T = 1; then
    REPLACE_ISWCNTRL=1
  else
    case "$gl_cv_func_iswcntrl_works" in
      *yes) REPLACE_ISWCNTRL=0 ;;
      *)    REPLACE_ISWCNTRL=1 ;;
    esac
  fi
  AC_SUBST([REPLACE_ISWCNTRL])

  if test $HAVE_ISWCNTRL = 0 || test $REPLACE_ISWCNTRL = 1; then
    dnl Redefine all of iswcntrl, ..., iswxdigit in <wctype.h>.
    :
  fi

  if test $REPLACE_ISWCNTRL = 1; then
    REPLACE_TOWLOWER=1
  else
    AC_CHECK_FUNCS([towlower])
    if test $ac_cv_func_towlower = yes; then
      REPLACE_TOWLOWER=0
    else
      AC_CHECK_DECLS([towlower],,,
        [[#include <wchar.h>
          #if HAVE_WCTYPE_H
          # include <wctype.h>
          #endif
        ]])
      if test $ac_cv_have_decl_towlower = yes; then
        dnl On Minix 3.1.8, the system's <wctype.h> declares towlower() and
        dnl towupper() although it does not have the functions. Avoid a
        dnl collision with gnulib's replacement.
        REPLACE_TOWLOWER=1
      else
        REPLACE_TOWLOWER=0
      fi
    fi
  fi
  AC_SUBST([REPLACE_TOWLOWER])

  if test $HAVE_ISWCNTRL = 0 || test $REPLACE_TOWLOWER = 1; then
    dnl Redefine towlower, towupper in <wctype.h>.
    :
  fi

  dnl We assume that the wctype() and iswctype() functions exist if and only
  dnl if the type wctype_t is defined in <wchar.h> or in <wctype.h> if that
  dnl exists.
  dnl HP-UX 11.00 declares all these in <wchar.h> and lacks <wctype.h>.
  AC_CACHE_CHECK([for wctype_t], [gl_cv_type_wctype_t],
    [AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM(
          [[#include <wchar.h>
            #if HAVE_WCTYPE_H
            # include <wctype.h>
            #endif
            wctype_t a;
          ]],
          [[]])],
       [gl_cv_type_wctype_t=yes],
       [gl_cv_type_wctype_t=no])
    ])
  if test $gl_cv_type_wctype_t = no; then
    HAVE_WCTYPE_T=0
  fi

  dnl We assume that the wctrans() and towctrans() functions exist if and only
  dnl if the type wctrans_t is defined in <wctype.h>.
  AC_CACHE_CHECK([for wctrans_t], [gl_cv_type_wctrans_t],
    [AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM(
          [[#include <wchar.h>
            #include <wctype.h>
            wctrans_t a;
          ]],
          [[]])],
       [gl_cv_type_wctrans_t=yes],
       [gl_cv_type_wctrans_t=no])
    ])
  if test $gl_cv_type_wctrans_t = no; then
    HAVE_WCTRANS_T=0
  fi

  dnl Check for declarations of anything we want to poison if the
  dnl corresponding gnulib module is not in use.
  gl_WARN_ON_USE_PREPARE([[
#if !(defined __GLIBC__ && !defined __UCLIBC__)
# include <wchar.h>
#endif
#include <wctype.h>
    ]],
    [wctype iswctype wctrans towctrans
    ])
])

# gl_WCTYPE_MODULE_INDICATOR([modulename])
# sets the shell variable that indicates the presence of the given module
# to a C preprocessor expression that will evaluate to 1.
# This macro invocation must not occur in macros that are AC_REQUIREd.
AC_DEFUN([gl_WCTYPE_MODULE_INDICATOR],
[
  dnl Ensure to expand the default settings once only.
  gl_WCTYPE_H_REQUIRE_DEFAULTS
  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
  dnl Define it also as a C macro, for the benefit of the unit tests.
  gl_MODULE_INDICATOR_FOR_TESTS([$1])
])

# Initializes the default values for AC_SUBSTed shell variables.
# This macro must not be AC_REQUIREd.  It must only be invoked, and only
# outside of macros or in macros that are not AC_REQUIREd.
AC_DEFUN([gl_WCTYPE_H_REQUIRE_DEFAULTS],
[
  m4_defun(GL_MODULE_INDICATOR_PREFIX[_WCTYPE_H_MODULE_INDICATOR_DEFAULTS], [
    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISWBLANK])
    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISWDIGIT])
    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISWXDIGIT])
    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCTYPE])
    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISWCTYPE])
    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCTRANS])
    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TOWCTRANS])
  ])
  m4_require(GL_MODULE_INDICATOR_PREFIX[_WCTYPE_H_MODULE_INDICATOR_DEFAULTS])
  AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
])

AC_DEFUN([gl_WCTYPE_H_DEFAULTS],
[
  dnl Assume proper GNU behavior unless another module says otherwise.
  HAVE_ISWBLANK=1;      AC_SUBST([HAVE_ISWBLANK])
  HAVE_WCTYPE_T=1;      AC_SUBST([HAVE_WCTYPE_T])
  HAVE_WCTRANS_T=1;     AC_SUBST([HAVE_WCTRANS_T])
  REPLACE_ISWBLANK=0;   AC_SUBST([REPLACE_ISWBLANK])
  REPLACE_ISWDIGIT=0;   AC_SUBST([REPLACE_ISWDIGIT])
  REPLACE_ISWXDIGIT=0;  AC_SUBST([REPLACE_ISWXDIGIT])
])