1# wctype_h.m4 serial 26
2
3dnl A placeholder for ISO C99 <wctype.h>, for platforms that lack it.
4
5dnl Copyright (C) 2006-2021 Free Software Foundation, Inc.
6dnl This file is free software; the Free Software Foundation
7dnl gives unlimited permission to copy and/or distribute it,
8dnl with or without modifications, as long as this notice is preserved.
9
10dnl Written by Paul Eggert.
11
12AC_DEFUN([gl_WCTYPE_H],
13[
14  AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
15  AC_REQUIRE([AC_PROG_CC])
16  AC_REQUIRE([AC_CANONICAL_HOST])
17  AC_CHECK_FUNCS_ONCE([iswcntrl])
18  if test $ac_cv_func_iswcntrl = yes; then
19    HAVE_ISWCNTRL=1
20  else
21    HAVE_ISWCNTRL=0
22  fi
23  AC_SUBST([HAVE_ISWCNTRL])
24
25  AC_REQUIRE([gt_TYPE_WINT_T])
26  if test $gt_cv_c_wint_t = yes; then
27    HAVE_WINT_T=1
28  else
29    HAVE_WINT_T=0
30  fi
31  AC_SUBST([HAVE_WINT_T])
32
33  AC_REQUIRE([gl_TYPE_WINT_T_PREREQ])
34
35  gl_CHECK_NEXT_HEADERS([wctype.h])
36  if test $ac_cv_header_wctype_h = yes; then
37    if test $ac_cv_func_iswcntrl = yes; then
38      dnl Linux libc5 has an iswprint function that returns 0 for all arguments.
39      dnl The other functions are likely broken in the same way.
40      AC_CACHE_CHECK([whether iswcntrl works], [gl_cv_func_iswcntrl_works],
41        [
42          AC_RUN_IFELSE(
43            [AC_LANG_SOURCE([[
44               #include <wchar.h>
45               #include <wctype.h>
46               int main () { return iswprint ('x') == 0; }
47            ]])],
48            [gl_cv_func_iswcntrl_works=yes], [gl_cv_func_iswcntrl_works=no],
49            [dnl Guess no on Linux libc5, yes otherwise.
50             AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdlib.h>
51                          #if __GNU_LIBRARY__ == 1
52                          Linux libc5 i18n is broken.
53                          #endif]], [[]])],
54              [gl_cv_func_iswcntrl_works="guessing yes"],
55              [gl_cv_func_iswcntrl_works="guessing no"])
56            ])
57        ])
58    fi
59    HAVE_WCTYPE_H=1
60  else
61    HAVE_WCTYPE_H=0
62  fi
63  AC_SUBST([HAVE_WCTYPE_H])
64
65  if test $GNULIB_OVERRIDES_WINT_T = 1; then
66    REPLACE_ISWCNTRL=1
67  else
68    case "$gl_cv_func_iswcntrl_works" in
69      *yes) REPLACE_ISWCNTRL=0 ;;
70      *)    REPLACE_ISWCNTRL=1 ;;
71    esac
72  fi
73  AC_SUBST([REPLACE_ISWCNTRL])
74
75  if test $HAVE_ISWCNTRL = 0 || test $REPLACE_ISWCNTRL = 1; then
76    dnl Redefine all of iswcntrl, ..., iswxdigit in <wctype.h>.
77    :
78  fi
79
80  if test $REPLACE_ISWCNTRL = 1; then
81    REPLACE_TOWLOWER=1
82  else
83    AC_CHECK_FUNCS([towlower])
84    if test $ac_cv_func_towlower = yes; then
85      REPLACE_TOWLOWER=0
86    else
87      AC_CHECK_DECLS([towlower],,,
88        [[#include <wchar.h>
89          #if HAVE_WCTYPE_H
90          # include <wctype.h>
91          #endif
92        ]])
93      if test $ac_cv_have_decl_towlower = yes; then
94        dnl On Minix 3.1.8, the system's <wctype.h> declares towlower() and
95        dnl towupper() although it does not have the functions. Avoid a
96        dnl collision with gnulib's replacement.
97        REPLACE_TOWLOWER=1
98      else
99        REPLACE_TOWLOWER=0
100      fi
101    fi
102  fi
103  AC_SUBST([REPLACE_TOWLOWER])
104
105  if test $HAVE_ISWCNTRL = 0 || test $REPLACE_TOWLOWER = 1; then
106    dnl Redefine towlower, towupper in <wctype.h>.
107    :
108  fi
109
110  dnl We assume that the wctype() and iswctype() functions exist if and only
111  dnl if the type wctype_t is defined in <wchar.h> or in <wctype.h> if that
112  dnl exists.
113  dnl HP-UX 11.00 declares all these in <wchar.h> and lacks <wctype.h>.
114  AC_CACHE_CHECK([for wctype_t], [gl_cv_type_wctype_t],
115    [AC_COMPILE_IFELSE(
116       [AC_LANG_PROGRAM(
117          [[#include <wchar.h>
118            #if HAVE_WCTYPE_H
119            # include <wctype.h>
120            #endif
121            wctype_t a;
122          ]],
123          [[]])],
124       [gl_cv_type_wctype_t=yes],
125       [gl_cv_type_wctype_t=no])
126    ])
127  if test $gl_cv_type_wctype_t = no; then
128    HAVE_WCTYPE_T=0
129  fi
130
131  dnl We assume that the wctrans() and towctrans() functions exist if and only
132  dnl if the type wctrans_t is defined in <wctype.h>.
133  AC_CACHE_CHECK([for wctrans_t], [gl_cv_type_wctrans_t],
134    [AC_COMPILE_IFELSE(
135       [AC_LANG_PROGRAM(
136          [[#include <wchar.h>
137            #include <wctype.h>
138            wctrans_t a;
139          ]],
140          [[]])],
141       [gl_cv_type_wctrans_t=yes],
142       [gl_cv_type_wctrans_t=no])
143    ])
144  if test $gl_cv_type_wctrans_t = no; then
145    HAVE_WCTRANS_T=0
146  fi
147
148  dnl Check for declarations of anything we want to poison if the
149  dnl corresponding gnulib module is not in use.
150  gl_WARN_ON_USE_PREPARE([[
151#if !(defined __GLIBC__ && !defined __UCLIBC__)
152# include <wchar.h>
153#endif
154#include <wctype.h>
155    ]],
156    [wctype iswctype wctrans towctrans
157    ])
158])
159
160AC_DEFUN([gl_WCTYPE_MODULE_INDICATOR],
161[
162  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
163  AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
164  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
165  dnl Define it also as a C macro, for the benefit of the unit tests.
166  gl_MODULE_INDICATOR_FOR_TESTS([$1])
167])
168
169AC_DEFUN([gl_WCTYPE_H_DEFAULTS],
170[
171  GNULIB_ISWBLANK=0;    AC_SUBST([GNULIB_ISWBLANK])
172  GNULIB_ISWDIGIT=0;    AC_SUBST([GNULIB_ISWDIGIT])
173  GNULIB_ISWXDIGIT=0;   AC_SUBST([GNULIB_ISWXDIGIT])
174  GNULIB_WCTYPE=0;      AC_SUBST([GNULIB_WCTYPE])
175  GNULIB_ISWCTYPE=0;    AC_SUBST([GNULIB_ISWCTYPE])
176  GNULIB_WCTRANS=0;     AC_SUBST([GNULIB_WCTRANS])
177  GNULIB_TOWCTRANS=0;   AC_SUBST([GNULIB_TOWCTRANS])
178  dnl Assume proper GNU behavior unless another module says otherwise.
179  HAVE_ISWBLANK=1;      AC_SUBST([HAVE_ISWBLANK])
180  HAVE_WCTYPE_T=1;      AC_SUBST([HAVE_WCTYPE_T])
181  HAVE_WCTRANS_T=1;     AC_SUBST([HAVE_WCTRANS_T])
182  REPLACE_ISWBLANK=0;   AC_SUBST([REPLACE_ISWBLANK])
183  REPLACE_ISWDIGIT=0;   AC_SUBST([REPLACE_ISWDIGIT])
184  REPLACE_ISWXDIGIT=0;  AC_SUBST([REPLACE_ISWXDIGIT])
185])
186