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safe-ctype.h

/* <ctype.h> replacement macros.

   Copyright (C) 2000 Free Software Foundation, Inc.
   Contributed by Zack Weinberg <zackw@stanford.edu>.

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 2 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; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite
Boston, MA 02111-1307, USA.

In addition, as a special exception, the Free Software Foundation
gives permission to link the code of its release of Wget with the
OpenSSL project's "OpenSSL" library (or with modified versions of it
that use the same license as the "OpenSSL" library), and distribute
the linked executables.  You must obey the GNU General Public License
in all respects for all of the code used other than "OpenSSL".  If you
modify this file, you may extend this exception to your version of the
file, but you are not obligated to do so.  If you do not wish to do
so, delete this exception statement from your version.  */

/* 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 */

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