safe-ctype.h

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/* <ctype.h> replacement macros.

   Copyright (C) 2000 Free Software Foundation, Inc.
   Contributed by Zack Weinberg <[e-mail]>.

This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.

Libiberty 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with libiberty.  If not, see
<http://www.gnu.org/licenses/>.

Additional permission under GNU GPL version 3 section 7

If you modify this program, or any covered work, by linking or
combining it with the OpenSSL project's OpenSSL library (or a
modified version of that library), containing parts covered by the
terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
grants you additional permission to convey the resulting work.
Corresponding Source for a non-source form of such a combination
shall include the source code for the parts of OpenSSL used as well
as that of the covered work.  */

/* This is a compatible replacement of the standard C library's <ctype.h>
   with the following properties:

   - Implements all isxxx() macros required by C99.
   - Also implements some character classes useful when
     parsing C-like languages.
   - Does not change behavior depending on the current locale.
   - Behaves properly for all values in the range of a signed or
     unsigned char.

   To avoid conflicts, this header defines the isxxx functions in upper
   case, e.g. ISALPHA not isalpha.  */

#ifndef SAFE_CTYPE_H
#define SAFE_CTYPE_H

/* Catch erroneous use of ctype macros.  Files that really know what
   they're doing can disable this check by defining the
   I_REALLY_WANT_CTYPE_MACROS preprocessor constant. */

#ifndef I_REALLY_WANT_CTYPE_MACROS

/* We used to #define these to errors, but that loses when real
   ctype.h is included, usually by a library's (OpenSSL's) header
   which gets #included after wget.h.  */

#undef isalpha
#undef isalnum
#undef isblank
#undef iscntrl
#undef isdigit
#undef isgraph
#undef islower
#undef isprint
#undef ispunct
#undef isspace
#undef isupper
#undef isxdigit

#endif /* I_REALLY_WANT_CTYPE_MACROS */

/* Categories.  */

enum {
  /* In C99 */
  _sch_isblank  = 0x0001,	/* space \t */
  _sch_iscntrl  = 0x0002,	/* nonprinting characters */
  _sch_isdigit  = 0x0004,	/* 0-9 */
  _sch_islower  = 0x0008,	/* a-z */
  _sch_isprint  = 0x0010,	/* any printing character including ' ' */
  _sch_ispunct  = 0x0020,	/* all punctuation */
  _sch_isspace  = 0x0040,	/* space \t \n \r \f \v */
  _sch_isupper  = 0x0080,	/* A-Z */
  _sch_isxdigit = 0x0100,	/* 0-9A-Fa-f */

  /* Extra categories useful to cpplib.  */
  _sch_isidst	= 0x0200,	/* A-Za-z_ */
  _sch_isvsp    = 0x0400,	/* \n \r */
  _sch_isnvsp   = 0x0800,	/* space \t \f \v \0 */

  /* Combinations of the above.  */
  _sch_isalpha  = _sch_isupper|_sch_islower,	/* A-Za-z */
  _sch_isalnum  = _sch_isalpha|_sch_isdigit,	/* A-Za-z0-9 */
  _sch_isidnum  = _sch_isidst|_sch_isdigit,	/* A-Za-z0-9_ */
  _sch_isgraph  = _sch_isalnum|_sch_ispunct,	/* isprint and not space */
  _sch_iscppsp  = _sch_isvsp|_sch_isnvsp	/* isspace + \0 */
};

/* Character classification.  */
extern const unsigned short _sch_istable[256];

#define _sch_test(c, bit) (_sch_istable[(c) & 0xff] & (unsigned short)(bit))

#define ISALPHA(c)  _sch_test(c, _sch_isalpha)
#define ISALNUM(c)  _sch_test(c, _sch_isalnum)
#define ISBLANK(c)  _sch_test(c, _sch_isblank)
#define ISCNTRL(c)  _sch_test(c, _sch_iscntrl)
#define ISDIGIT(c)  _sch_test(c, _sch_isdigit)
#define ISGRAPH(c)  _sch_test(c, _sch_isgraph)
#define ISLOWER(c)  _sch_test(c, _sch_islower)
#define ISPRINT(c)  _sch_test(c, _sch_isprint)
#define ISPUNCT(c)  _sch_test(c, _sch_ispunct)
#define ISSPACE(c)  _sch_test(c, _sch_isspace)
#define ISUPPER(c)  _sch_test(c, _sch_isupper)
#define ISXDIGIT(c) _sch_test(c, _sch_isxdigit)

#define ISIDNUM(c)	_sch_test(c, _sch_isidnum)
#define ISIDST(c)	_sch_test(c, _sch_isidst)
#define IS_VSPACE(c)	_sch_test(c, _sch_isvsp)
#define IS_NVSPACE(c)	_sch_test(c, _sch_isnvsp)
#define IS_SPACE_OR_NUL(c)	_sch_test(c, _sch_iscppsp)

/* Character transformation.  */
extern const unsigned char  _sch_toupper[256];
extern const unsigned char  _sch_tolower[256];
#define TOUPPER(c) _sch_toupper[(c) & 0xff]
#define TOLOWER(c) _sch_tolower[(c) & 0xff]

#endif /* SAFE_CTYPE_H */