include/safe-ctype.h

   1 /* <ctype.h> replacement macros.
   2
   3    Copyright (C) 2000, 2001 Free Software Foundation, Inc.
   4    Contributed by Zack Weinberg <zackw@stanford.edu>.
   5
   6 This file is part of the libiberty library.
   7 Libiberty is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU Library General Public
   9 License as published by the Free Software Foundation; either
  10 version 2 of the License, or (at your option) any later version.
  11
  12 Libiberty is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 Library General Public License for more details.
  16
  17 You should have received a copy of the GNU Library General Public
  18 License along with libiberty; see the file COPYING.LIB.  If
  19 not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 /* This is a compatible replacement of the standard C library's <ctype.h>
  23    with the following properties:
  24
  25    - Implements all isxxx() macros required by C99.
  26    - Also implements some character classes useful when
  27      parsing C-like languages.
  28    - Does not change behavior depending on the current locale.
  29    - Behaves properly for all values in the range of a signed or
  30      unsigned char.
  31
  32    To avoid conflicts, this header defines the isxxx functions in upper
  33    case, e.g. ISALPHA not isalpha.  */
  34
  35 #ifndef SAFE_CTYPE_H
  36 #define SAFE_CTYPE_H
  37
  38 #ifdef isalpha
  39  #error "safe-ctype.h and ctype.h may not be used simultaneously"
  40 #endif
  41
  42 /* Determine host character set.  */
  43 #define HOST_CHARSET_UNKNOWN 0
  44 #define HOST_CHARSET_ASCII   1
  45 #define HOST_CHARSET_EBCDIC  2
  46
  47 #if  '\n' == 0x0A && ' ' == 0x20 && '0' == 0x30 \
  48    && 'A' == 0x41 && 'a' == 0x61 && '!' == 0x21
  49 #  define HOST_CHARSET HOST_CHARSET_ASCII
  50 #else
  51 # if '\n' == 0x15 && ' ' == 0x40 && '0' == 0xF0 \
  52    && 'A' == 0xC1 && 'a' == 0x81 && '!' == 0x5A
  53 #  define HOST_CHARSET HOST_CHARSET_EBCDIC
  54 # else
  55 #  define HOST_CHARSET HOST_CHARSET_UNKNOWN
  56 # endif
  57 #endif
  58
  59 /* Categories.  */
  60
  61 enum {
  62   /* In C99 */
  63   _sch_isblank  = 0x0001,       /* space \t */
  64   _sch_iscntrl  = 0x0002,       /* nonprinting characters */
  65   _sch_isdigit  = 0x0004,       /* 0-9 */
  66   _sch_islower  = 0x0008,       /* a-z */
  67   _sch_isprint  = 0x0010,       /* any printing character including ' ' */
  68   _sch_ispunct  = 0x0020,       /* all punctuation */
  69   _sch_isspace  = 0x0040,       /* space \t \n \r \f \v */
  70   _sch_isupper  = 0x0080,       /* A-Z */
  71   _sch_isxdigit = 0x0100,       /* 0-9A-Fa-f */
  72
  73   /* Extra categories useful to cpplib.  */
  74   _sch_isidst   = 0x0200,       /* A-Za-z_ */
  75   _sch_isvsp    = 0x0400,       /* \n \r */
  76   _sch_isnvsp   = 0x0800,       /* space \t \f \v \0 */
  77
  78   /* Combinations of the above.  */
  79   _sch_isalpha  = _sch_isupper|_sch_islower,    /* A-Za-z */
  80   _sch_isalnum  = _sch_isalpha|_sch_isdigit,    /* A-Za-z0-9 */
  81   _sch_isidnum  = _sch_isidst|_sch_isdigit,     /* A-Za-z0-9_ */
  82   _sch_isgraph  = _sch_isalnum|_sch_ispunct,    /* isprint and not space */
  83   _sch_iscppsp  = _sch_isvsp|_sch_isnvsp,       /* isspace + \0 */
  84   _sch_isbasic  = _sch_isprint|_sch_iscppsp     /* basic charset of ISO C
  85                                                    (plus ` and @)  */
  86 };
  87
  88 /* Character classification.  */
  89 extern const unsigned short _sch_istable[256];
  90
  91 #define _sch_test(c, bit) (_sch_istable[(c) & 0xff] & (unsigned short)(bit))
  92
  93 #define ISALPHA(c)  _sch_test(c, _sch_isalpha)
  94 #define ISALNUM(c)  _sch_test(c, _sch_isalnum)
  95 #define ISBLANK(c)  _sch_test(c, _sch_isblank)
  96 #define ISCNTRL(c)  _sch_test(c, _sch_iscntrl)
  97 #define ISDIGIT(c)  _sch_test(c, _sch_isdigit)
  98 #define ISGRAPH(c)  _sch_test(c, _sch_isgraph)
  99 #define ISLOWER(c)  _sch_test(c, _sch_islower)
 100 #define ISPRINT(c)  _sch_test(c, _sch_isprint)
 101 #define ISPUNCT(c)  _sch_test(c, _sch_ispunct)
 102 #define ISSPACE(c)  _sch_test(c, _sch_isspace)
 103 #define ISUPPER(c)  _sch_test(c, _sch_isupper)
 104 #define ISXDIGIT(c) _sch_test(c, _sch_isxdigit)
 105
 106 #define ISIDNUM(c)      _sch_test(c, _sch_isidnum)
 107 #define ISIDST(c)       _sch_test(c, _sch_isidst)
 108 #define IS_ISOBASIC(c)  _sch_test(c, _sch_isbasic)
 109 #define IS_VSPACE(c)    _sch_test(c, _sch_isvsp)
 110 #define IS_NVSPACE(c)   _sch_test(c, _sch_isnvsp)
 111 #define IS_SPACE_OR_NUL(c)      _sch_test(c, _sch_iscppsp)
 112
 113 /* Character transformation.  */
 114 extern const unsigned char  _sch_toupper[256];
 115 extern const unsigned char  _sch_tolower[256];
 116 #define TOUPPER(c) _sch_toupper[(c) & 0xff]
 117 #define TOLOWER(c) _sch_tolower[(c) & 0xff]
 118
 119 #endif /* SAFE_CTYPE_H */