ctype/ctype.h

   1 /* Copyright (C) 1991, 1992, 1993, 1995 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
  16 not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /*
  20  *      ANSI Standard 4.3: CHARACTER HANDLING   <ctype.h>
  21  */
  22
  23 #ifndef _CTYPE_H
  24
  25 #define _CTYPE_H        1
  26 #include <features.h>
  27
  28 __BEGIN_DECLS
  29
  30 /* These are all the characteristics of characters.
  31    If there get to be more than 16 distinct characteristics,
  32    many things must be changed that use `unsigned short int's.
  33
  34    The characteristics are stored always in network byte order (big
  35    endian).  We define the bit value interpretations here dependent on the
  36    machine's byte order.  */
  37
  38 #include <endian.h>
  39 #if __BYTE_ORDER == __BIG_ENDIAN
  40 #define _ISbit(bit)     (1 << bit)
  41 #else /* __BYTE_ORDER == __LITTLE_ENDIAN */
  42 #define _ISbit(bit)     ((1 << bit) << (bit < 8 ? 8 : -8))
  43 #endif
  44
  45 enum
  46 {
  47   _ISupper = _ISbit (0),        /* UPPERCASE.  */
  48   _ISlower = _ISbit (1),        /* lowercase.  */
  49   _ISalpha = _ISbit (2),        /* Alphabetic.  */
  50   _ISdigit = _ISbit (3),        /* Numeric.  */
  51   _ISxdigit = _ISbit (4),       /* Hexadecimal numeric.  */
  52   _ISspace = _ISbit (5),        /* Whitespace.  */
  53   _ISprint = _ISbit (6),        /* Printing.  */
  54   _ISgraph = _ISbit (7),        /* Graphical.  */
  55   _ISblank = _ISbit (8),        /* Blank (usually SPC and TAB).  */
  56   _IScntrl = _ISbit (9),        /* Control character.  */
  57   _ISpunct = _ISbit (10),       /* Punctuation.  */
  58
  59   /* The following are defined in POSIX.2 as being combinations of the
  60      classes above.  */
  61   _ISalnum = _ISalpha | _ISdigit        /* Alphanumeric.  */
  62 };
  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).  ANSI 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 `short int's
  72    rather than `unsigned char's because tolower (EOF) must be EOF, which
  73    doesn't fit into an `unsigned char'.  */
  74 extern __const unsigned short int *__ctype_b;   /* Characteristics.  */
  75 extern __const short int *__ctype_tolower;      /* Case conversions.  */
  76 extern __const short int *__ctype_toupper;      /* Case conversions.  */
  77
  78 #define __isctype(c, type) \
  79   (__ctype_b[(int) (c)] & (unsigned short int) type)
  80
  81 #define __isascii(c)    (((c) & (1 << 7)) == 0) /* If high bit is set.  */
  82 #define __toascii(c)    ((c) & 0x7f) /* Mask off high bit.  */
  83
  84 #define __tolower(c)    ((int) __ctype_tolower[(int) (c)])
  85 #define __toupper(c)    ((int) __ctype_toupper[(int) (c)])
  86
  87 #define __exctype(name) extern int name __P ((int))
  88
  89 /* The following names are all functions:
  90      int isCHARACTERISTIC(int c);
  91    which return nonzero iff C has CHARACTERISTIC.
  92    For the meaning of the characteristic names, see the `enum' above.  */
  93 __exctype (isalnum);
  94 __exctype (isalpha);
  95 __exctype (iscntrl);
  96 __exctype (isdigit);
  97 __exctype (islower);
  98 __exctype (isgraph);
  99 __exctype (isprint);
 100 __exctype (ispunct);
 101 __exctype (isspace);
 102 __exctype (isupper);
 103 __exctype (isxdigit);
 104
 105 #ifdef  __USE_GNU
 106 __exctype (isblank);
 107 #endif
 108
 109
 110 /* Return the lowercase version of C.  */
 111 extern int tolower __P ((int __c));
 112
 113 /* Return the uppercase version of C.  */
 114 extern int toupper __P ((int __c));
 115
 116
 117 #if defined(__USE_SVID) || defined(__USE_MISC)
 118
 119 /* Return nonzero iff C is in the ASCII set
 120    (i.e., is no more than 7 bits wide).  */
 121 extern int isascii __P ((int __c));
 122
 123 /* Return the part of C that is in the ASCII set
 124    (i.e., the low-order 7 bits of C).  */
 125 extern int toascii __P ((int __c));
 126
 127 #endif /* Use SVID or use misc.  */
 128
 129 #ifdef  __USE_SVID
 130 /* These are the same as `toupper' and `tolower'.  */
 131 __exctype (_toupper);
 132 __exctype (_tolower);
 133 #endif
 134
 135 #ifndef __NO_CTYPE
 136 #define isalnum(c)      __isctype((c), _ISalnum)
 137 #define isalpha(c)      __isctype((c), _ISalpha)
 138 #define iscntrl(c)      __isctype((c), _IScntrl)
 139 #define isdigit(c)      __isctype((c), _ISdigit)
 140 #define islower(c)      __isctype((c), _ISlower)
 141 #define isgraph(c)      __isctype((c), _ISgraph)
 142 #define isprint(c)      __isctype((c), _ISprint)
 143 #define ispunct(c)      __isctype((c), _ISpunct)
 144 #define isspace(c)      __isctype((c), _ISspace)
 145 #define isupper(c)      __isctype((c), _ISupper)
 146 #define isxdigit(c)     __isctype((c), _ISxdigit)
 147
 148 #ifdef  __USE_GNU
 149 #define isblank(c)      __isctype((c), _ISblank)
 150 #endif
 151
 152 #define tolower(c)      __tolower(c)
 153 #define toupper(c)      __toupper(c)
 154
 155 #if defined(__USE_SVID) || defined(__USE_MISC)
 156 #define isascii(c)      __isascii(c)
 157 #define toascii(c)      __toascii(c)
 158 #endif
 159
 160 #endif /* Not __NO_CTYPE.  */
 161
 162 __END_DECLS
 163
 164 #endif /* ctype.h  */