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c-ctype.h
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c-ctype.h
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/* c-ctype.h: ASCII-safe versions of the <ctype.h> macros.
Copyright 1992, 1994, 2008, 2010, 2011, 2015 Karl Berry.
Copyright 1998, 2000, 2005 Olaf Weber.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, see <http://www.gnu.org/licenses/>. */
#ifndef KPATHSEA_C_CTYPE_H
#define KPATHSEA_C_CTYPE_H
#include <ctype.h>
/* Be sure we have `isascii'. */
#ifndef WIN32
#if !(defined(HAVE_DECL_ISASCII) && HAVE_DECL_ISASCII)
#define isascii(c) (((c) & ~0x7f) == 0)
#endif
#endif
#define ISALNUM(c) (isascii (c) && isalnum((unsigned char)c))
#define ISALPHA(c) (isascii (c) && isalpha((unsigned char)c))
#define ISASCII isascii
#define ISCNTRL(c) (isascii (c) && iscntrl((unsigned char)c))
#define ISDIGIT(c) (isascii (c) && isdigit ((unsigned char)c))
#define ISGRAPH(c) (isascii (c) && isgraph((unsigned char)c))
#define ISLOWER(c) (isascii (c) && islower((unsigned char)c))
#define ISPRINT(c) (isascii (c) && isprint((unsigned char)c))
#define ISPUNCT(c) (isascii (c) && ispunct((unsigned char)c))
#define ISSPACE(c) (isascii (c) && isspace((unsigned char)c))
#define ISUPPER(c) (isascii (c) && isupper((unsigned char)c))
#define ISXDIGIT(c) (isascii (c) && isxdigit((unsigned char)c))
#define TOASCII toascii
#define TOLOWER(c) (ISUPPER (c) ? tolower ((unsigned char)c) : (c))
#define TOUPPER(c) (ISLOWER (c) ? toupper ((unsigned char)c) : (c))
/* This isn't part of the usual <ctype.h>, but it's useful sometimes. */
#ifndef isblank
#define isblank(c) ((c) == ' ' || (c) == '\t')
#endif
#define ISBLANK(c) (isascii (c) && isblank ((unsigned char)c))
/* Here's why this mess is necessary:
From: meyering@cs.utexas.edu (Jim Meyering)
Date: Wed, 25 Nov 1992 09:52:33 -0600
Subject: ss-921123: using isascii with <ctype.h> macros
Yesterday some cursory regression testing found that GNU od
(in an upcoming release of textutils) generated incorrect output
when run on an SGI indigo because isprint ('\377') returned true.
Of course, '\377' is not a printing character; the problem lay
in using isprint without first making sure its integer argument
corresponded to an ascii code.
MORAL: always guard uses of ctype macros with isascii if it's available.
An obvious alternative is to avoid <ctype.h> and define and use your
own versions of the ctype macros.
A pretty clean approach to using <ctype.h> and isascii was
suggested by David MacKenzie:
#ifndef isascii
#define isascii(c) 1
#endif
#define ISDIGIT(c) (isascii (c) && isdigit (c))
#define ISPRINT(c) (isascii (c) && isprint (c))
...
then, use ISDIGIT, etc. instead of isdigit, etc. */
#endif /* not KPATHSEA_C_CTYPE_H */