Imported Upstream version 1.3.14

[debian/gzip] / m4 / wctype.m4

diff --git a/m4/wctype.m4 b/m4/wctype.m4
new file mode 100644 (file)
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--- /dev/null
+++ b/m4/wctype.m4
@@ -0,0 +1,84 @@
+# wctype.m4 serial 4
+
+dnl A placeholder for ISO C99 <wctype.h>, for platforms that lack it.
+
+dnl Copyright (C) 2006-2009 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([gl_WCTYPE_H],
+[
+  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_CHECK_HEADERS_ONCE([wctype.h])
+  AC_REQUIRE([AC_C_INLINE])
+
+  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])
+
+  WCTYPE_H=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 <stddef.h>
+                            #include <stdio.h>
+                            #include <time.h>
+                            #include <wchar.h>
+                            #include <wctype.h>
+                            int main () { return iswprint ('x') == 0; }]])],
+            [gl_cv_func_iswcntrl_works=yes], [gl_cv_func_iswcntrl_works=no],
+            [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdlib.h>
+                          #if __GNU_LIBRARY__ == 1
+                          Linux libc5 i18n is broken.
+                          #endif]], [])],
+              [gl_cv_func_iswcntrl_works=yes], [gl_cv_func_iswcntrl_works=no])
+            ])
+        ])
+      if test $gl_cv_func_iswcntrl_works = yes; then
+        case "$host_os" in
+          mingw*)
+            dnl On mingw, towlower and towupper return random high 16 bits.
+            ;;
+          *)
+            dnl iswcntrl works. towlower and towupper work as well.
+            WCTYPE_H=
+            ;;
+        esac
+      fi
+    fi
+    dnl Compute NEXT_WCTYPE_H even if WCTYPE_H is empty,
+    dnl for the benefit of builds from non-distclean directories.
+    gl_CHECK_NEXT_HEADERS([wctype.h])
+    HAVE_WCTYPE_H=1
+  else
+    HAVE_WCTYPE_H=0
+  fi
+  AC_SUBST([HAVE_WCTYPE_H])
+  AC_SUBST([WCTYPE_H])
+
+  if test "$gl_cv_func_iswcntrl_works" = no; then
+    REPLACE_ISWCNTRL=1
+  else
+    REPLACE_ISWCNTRL=0
+  fi
+  AC_SUBST([REPLACE_ISWCNTRL])
+])