Here comes the 'isblank' module:
2009-10-18 Bruno Haible <br...@clisp.org>
New module 'isblank'.
* lib/isblank.c: New file.
* m4/isblank.m4: New file.
* modules/isblank: New file.
* doc/posix-functions/isblank.texi: Mention the new module.
================================ lib/isblank.c ================================
/* Test whether a character is a blank.
Copyright (C) 2009 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <ctype.h>
int
isblank (int c)
{
/* On all known platforms, in all predefined locales, isblank(c) is likely
equivalent with (c == ' ' || c == '\t'). Look at the glibc definition
(in glibc/localedata/locales/i18n): The "blank" characters are '\t', ' ',
U+1680, U+180E, U+2000..U+2006, U+2008..U+200A, U+205F, U+3000, and none
except the first two is present in a common 8-bit encoding. Therefore
the substitute for other platforms is not more complicated than this. */
return (c == ' ' || c == '\t');
}
================================ m4/isblank.m4 ================================
# isblank.m4 serial 1
dnl Copyright (C) 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.
AC_DEFUN([gl_FUNC_ISBLANK],
[
dnl Persuade glibc <ctype.h> to declare isblank().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
AC_CHECK_FUNCS_ONCE([isblank])
if test $ac_cv_func_isblank = no; then
HAVE_ISBLANK=0
CTYPE_H='ctype.h'
AC_LIBOBJ([isblank])
fi
])
=============================== modules/isblank ===============================
Description:
isblank() function: test whether a single-byte character is a blank.
Files:
lib/isblank.c
m4/isblank.m4
Depends-on:
extensions
ctype
configure.ac:
gl_FUNC_ISBLANK
gl_CTYPE_MODULE_INDICATOR([isblank])
Makefile.am:
Include:
<ctype.h>
License:
LGPLv2+
Maintainer:
Bruno Haible
===============================================================================
--- doc/posix-functions/isblank.texi.orig 2009-10-18 21:14:36.000000000
+0200
+++ doc/posix-functions/isblank.texi 2009-10-07 11:12:33.000000000 +0200
@@ -4,15 +4,15 @@
POSIX specification:
@url{http://www.opengroup.org/onlinepubs/9699919799/functions/isblank.html}
-Gnulib module: ---
+Gnulib module: isblank
Portability problems fixed by Gnulib:
@itemize
+...@item
+This function is missing on some platforms:
+AIX 4.3.2, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
-...@item
-This function is missing on some platforms:
-AIX 4.3.2, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw.
@end itemize
