ctype/ctype.h

   1 /* Copyright (C) 1991, 92, 93, 95, 96, 97 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 /*
  20  *      ISO C Standard 4.3: CHARACTER HANDLING  <ctype.h>
  21  */
  22
  23 #ifndef _CTYPE_H
  24 #define _CTYPE_H        1
  25
  26 #include <features.h>
  27 #include <bits/types.h>
  28
  29 __BEGIN_DECLS
  30
  31 #ifndef _ISbit
  32 /* These are all the characteristics of characters.
  33    If there get to be more than 16 distinct characteristics,
  34    many things must be changed that use `unsigned short int's.
  35
  36    The characteristics are stored always in network byte order (big
  37    endian).  We define the bit value interpretations here dependent on the
  38    machine's byte order.  */
  39
  40 # include <endian.h>
  41 # if __BYTE_ORDER == __BIG_ENDIAN
  42 #  define _ISbit(bit)   (1 << bit)
  43 # else /* __BYTE_ORDER == __LITTLE_ENDIAN */
  44 #  define _ISbit(bit)   (bit < 8 ? ((1 << bit) << 8) : ((1 << bit) >> 8))
  45 # endif
  46
  47 enum
  48 {
  49   _ISupper = _ISbit (0),        /* UPPERCASE.  */
  50   _ISlower = _ISbit (1),        /* lowercase.  */
  51   _ISalpha = _ISbit (2),        /* Alphabetic.  */
  52   _ISdigit = _ISbit (3),        /* Numeric.  */
  53   _ISxdigit = _ISbit (4),       /* Hexadecimal numeric.  */
  54   _ISspace = _ISbit (5),        /* Whitespace.  */
  55   _ISprint = _ISbit (6),        /* Printing.  */
  56   _ISgraph = _ISbit (7),        /* Graphical.  */
  57   _ISblank = _ISbit (8),        /* Blank (usually SPC and TAB).  */
  58   _IScntrl = _ISbit (9),        /* Control character.  */
  59   _ISpunct = _ISbit (10),       /* Punctuation.  */
  60   _ISalnum = _ISbit (11)        /* Alphanumeric.  */
  61 };
  62 #endif /* ! _ISbit  */
  63
  64 /* These are defined in ctype-info.c.
  65    The declarations here must match those in localeinfo.h.
  66
  67    These point into arrays of 384, so they can be indexed by any `unsigned
  68    char' value [0,255]; by EOF (-1); or by any `signed char' value
  69    [-128,-1).  ISO C requires that the ctype functions work for `unsigned
  70    char' values and for EOF; we also support negative `signed char' values
  71    for broken old programs.  The case conversion arrays are of `int's
  72    rather than `unsigned char's because tolower (EOF) must be EOF, which
  73    doesn't fit into an `unsigned char'.  But today more important is that
  74    the arrays are also used for multi-byte character sets.  */
  75 extern __const unsigned short int *__ctype_b;   /* Characteristics.  */
  76 extern __const __int32_t *__ctype_tolower; /* Case conversions.  */
  77 extern __const __int32_t *__ctype_toupper; /* Case conversions.  */
  78
  79 #define __isctype(c, type) \
  80   (__ctype_b[(int) (c)] & (unsigned short int) type)
  81
  82 #define __isascii(c)    (((c) & ~0x7f) == 0)    /* If C is a 7 bit value.  */
  83 #define __toascii(c)    ((c) & 0x7f)            /* Mask off high bits.  */
  84
  85 #define __tolower(c)    ((int) __ctype_tolower[(int) (c)])
  86 #define __toupper(c)    ((int) __ctype_toupper[(int) (c)])
  87
  88 #define __exctype(name) extern int name __P ((int))
  89
  90 /* The following names are all functions:
  91      int isCHARACTERISTIC(int c);
  92    which return nonzero iff C has CHARACTERISTIC.
  93    For the meaning of the characteristic names, see the `enum' above.  */
  94 __exctype (isalnum);
  95 __exctype (isalpha);
  96 __exctype (iscntrl);
  97 __exctype (isdigit);
  98 __exctype (islower);
  99 __exctype (isgraph);
 100 __exctype (isprint);
 101 __exctype (ispunct);
 102 __exctype (isspace);
 103 __exctype (isupper);
 104 __exctype (isxdigit);
 105
 106 #ifdef  __USE_GNU
 107 __exctype (isblank);
 108 #endif
 109
 110
 111 /* Return the lowercase version of C.  */
 112 extern int tolower __P ((int __c));
 113
 114 /* Return the uppercase version of C.  */
 115 extern int toupper __P ((int __c));
 116
 117
 118 #if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
 119
 120 /* Return nonzero iff C is in the ASCII set
 121    (i.e., is no more than 7 bits wide).  */
 122 extern int isascii __P ((int __c));
 123
 124 /* Return the part of C that is in the ASCII set
 125    (i.e., the low-order 7 bits of C).  */
 126 extern int toascii __P ((int __c));
 127
 128 #endif /* Use SVID or use misc.  */
 129
 130 #if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
 131 /* These are the same as `toupper' and `tolower'.  */
 132 __exctype (_toupper);
 133 __exctype (_tolower);
 134 #endif
 135
 136 #ifndef __NO_CTYPE
 137 # define isalnum(c)     __isctype((c), _ISalnum)
 138 # define isalpha(c)     __isctype((c), _ISalpha)
 139 # define iscntrl(c)     __isctype((c), _IScntrl)
 140 # define isdigit(c)     __isctype((c), _ISdigit)
 141 # define islower(c)     __isctype((c), _ISlower)
 142 # define isgraph(c)     __isctype((c), _ISgraph)
 143 # define isprint(c)     __isctype((c), _ISprint)
 144 # define ispunct(c)     __isctype((c), _ISpunct)
 145 # define isspace(c)     __isctype((c), _ISspace)
 146 # define isupper(c)     __isctype((c), _ISupper)
 147 # define isxdigit(c)    __isctype((c), _ISxdigit)
 148
 149 #ifdef  __USE_GNU
 150 # define isblank(c)     __isctype((c), _ISblank)
 151 #endif
 152
 153 #define tolower(c)      __tolower(c)
 154 #define toupper(c)      __toupper(c)
 155
 156 #if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
 157 # define isascii(c)     __isascii(c)
 158 # define toascii(c)     __toascii(c)
 159 #endif
 160
 161 #endif /* Not __NO_CTYPE.  */
 162
 163
 164 #ifdef __USE_GNU
 165 /* The concept of one static locale per category is not very well
 166    thought out.  Many applications will need to process its data using
 167    information from several different locales.  Another application is
 168    the implementation of the internationalization handling in the
 169    upcoming ISO C++ standard library.  To support this another set of
 170    the functions using locale data exist which have an additional
 171    argument.
 172
 173    Attention: all these functions are *not* standardized in any form.
 174    This is a proof-of-concept implementation.  */
 175
 176 /* Structure for reentrant locale using functions.  This is an
 177    (almost) opaque type for the user level programs.  */
 178 # include <xlocale.h>
 179
 180 /* These definitions are similar to the ones above but all functions
 181    take as an argument a handle for the locale which shall be used.  */
 182 # define __isctype_l(c, type, locale) \
 183   ((locale)->__ctype_b[(int) (c)] & (unsigned short int) type)
 184
 185 # define __tolower_l(c, locale) ((int) (locale)->__ctype_tolower[(int) (c)])
 186 # define __toupper_l(c, locale) ((int) (locale)->__ctype_toupper[(int) (c)])
 187
 188 # define __exctype_l(name)      extern int name __P ((int, __locale_t))
 189
 190 /* The following names are all functions:
 191      int isCHARACTERISTIC(int c, locale_t *locale);
 192    which return nonzero iff C has CHARACTERISTIC.
 193    For the meaning of the characteristic names, see the `enum' above.  */
 194 __exctype_l (__isalnum_l);
 195 __exctype_l (__isalpha_l);
 196 __exctype_l (__iscntrl_l);
 197 __exctype_l (__isdigit_l);
 198 __exctype_l (__islower_l);
 199 __exctype_l (__isgraph_l);
 200 __exctype_l (__isprint_l);
 201 __exctype_l (__ispunct_l);
 202 __exctype_l (__isspace_l);
 203 __exctype_l (__isupper_l);
 204 __exctype_l (__isxdigit_l);
 205
 206 __exctype_l (__isblank_l);
 207
 208
 209 /* Return the lowercase version of C in locale L.  */
 210 extern int __tolower_l __P ((int __c, __locale_t __l));
 211
 212 /* Return the uppercase version of C.  */
 213 extern int __toupper_l __P ((int __c, __locale_t __l));
 214
 215
 216 # ifndef __NO_CTYPE
 217 #  define __isalnum_l(c,l)      __isctype_l((c), _ISalnum, (l))
 218 #  define __isalpha_l(c,l)      __isctype_l((c), _ISalpha, (l))
 219 #  define __iscntrl_l(c,l)      __isctype_l((c), _IScntrl, (l))
 220 #  define __isdigit_l(c,l)      __isctype_l((c), _ISdigit, (l))
 221 #  define __islower_l(c,l)      __isctype_l((c), _ISlower, (l))
 222 #  define __isgraph_l(c,l)      __isctype_l((c), _ISgraph, (l))
 223 #  define __isprint_l(c,l)      __isctype_l((c), _ISprint, (l))
 224 #  define __ispunct_l(c,l)      __isctype_l((c), _ISpunct, (l))
 225 #  define __isspace_l(c,l)      __isctype_l((c), _ISspace, (l))
 226 #  define __isupper_l(c,l)      __isctype_l((c), _ISupper, (l))
 227 #  define __isxdigit_l(c,l)     __isctype_l((c), _ISxdigit, (l))
 228
 229 #  define __isblank_l(c,l)      __isctype_l((c), _ISblank, (l))
 230
 231 #  if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
 232 #   define __isascii_l(c,l)     __isascii(c)
 233 #   define __toascii_l(c,l)     __toascii(c)
 234 #  endif
 235
 236 # endif /* Not __NO_CTYPE.  */
 237
 238 #endif /* Use GNU.  */
 239
 240 __END_DECLS
 241
 242 #endif /* ctype.h  */