ctype/ctype.h

   1 /* Copyright (C) 1991,92,93,95,96,97,98,99,2001,2002,2004,2007,2008
   2         Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /*
  21  *      ISO C99 Standard 7.4: Character handling        <ctype.h>
  22  */
  23
  24 #ifndef _CTYPE_H
  25 #define _CTYPE_H        1
  26
  27 #include <features.h>
  28 #include <bits/types.h>
  29
  30 __BEGIN_DECLS
  31
  32 #ifndef _ISbit
  33 /* These are all the characteristics of characters.
  34    If there get to be more than 16 distinct characteristics,
  35    many things must be changed that use `unsigned short int's.
  36
  37    The characteristics are stored always in network byte order (big
  38    endian).  We define the bit value interpretations here dependent on the
  39    machine's byte order.  */
  40
  41 # include <endian.h>
  42 # if __BYTE_ORDER == __BIG_ENDIAN
  43 #  define _ISbit(bit)   (1 << (bit))
  44 # else /* __BYTE_ORDER == __LITTLE_ENDIAN */
  45 #  define _ISbit(bit)   ((bit) < 8 ? ((1 << (bit)) << 8) : ((1 << (bit)) >> 8))
  46 # endif
  47
  48 enum
  49 {
  50   _ISupper = _ISbit (0),        /* UPPERCASE.  */
  51   _ISlower = _ISbit (1),        /* lowercase.  */
  52   _ISalpha = _ISbit (2),        /* Alphabetic.  */
  53   _ISdigit = _ISbit (3),        /* Numeric.  */
  54   _ISxdigit = _ISbit (4),       /* Hexadecimal numeric.  */
  55   _ISspace = _ISbit (5),        /* Whitespace.  */
  56   _ISprint = _ISbit (6),        /* Printing.  */
  57   _ISgraph = _ISbit (7),        /* Graphical.  */
  58   _ISblank = _ISbit (8),        /* Blank (usually SPC and TAB).  */
  59   _IScntrl = _ISbit (9),        /* Control character.  */
  60   _ISpunct = _ISbit (10),       /* Punctuation.  */
  61   _ISalnum = _ISbit (11)        /* Alphanumeric.  */
  62 };
  63 #endif /* ! _ISbit  */
  64
  65 /* These are defined in ctype-info.c.
  66    The declarations here must match those in localeinfo.h.
  67
  68    In the thread-specific locale model (see `uselocale' in <locale.h>)
  69    we cannot use global variables for these as was done in the past.
  70    Instead, the following accessor functions return the address of
  71    each variable, which is local to the current thread if multithreaded.
  72
  73    These point into arrays of 384, so they can be indexed by any `unsigned
  74    char' value [0,255]; by EOF (-1); or by any `signed char' value
  75    [-128,-1).  ISO C requires that the ctype functions work for `unsigned
  76    char' values and for EOF; we also support negative `signed char' values
  77    for broken old programs.  The case conversion arrays are of `int's
  78    rather than `unsigned char's because tolower (EOF) must be EOF, which
  79    doesn't fit into an `unsigned char'.  But today more important is that
  80    the arrays are also used for multi-byte character sets.  */
  81 extern __const unsigned short int **__ctype_b_loc (void)
  82      __THROW __attribute__ ((__const));
  83 extern __const __int32_t **__ctype_tolower_loc (void)
  84      __THROW __attribute__ ((__const));
  85 extern __const __int32_t **__ctype_toupper_loc (void)
  86      __THROW __attribute__ ((__const));
  87
  88 #define __isctype(c, type) \
  89   ((*__ctype_b_loc ())[(int) (c)] & (unsigned short int) type)
  90
  91 #define __isascii(c)    (((c) & ~0x7f) == 0)    /* If C is a 7 bit value.  */
  92 #define __toascii(c)    ((c) & 0x7f)            /* Mask off high bits.  */
  93
  94 #define __exctype(name) extern int name (int) __THROW
  95
  96 __BEGIN_NAMESPACE_STD
  97
  98 /* The following names are all functions:
  99      int isCHARACTERISTIC(int c);
 100    which return nonzero iff C has CHARACTERISTIC.
 101    For the meaning of the characteristic names, see the `enum' above.  */
 102 __exctype (isalnum);
 103 __exctype (isalpha);
 104 __exctype (iscntrl);
 105 __exctype (isdigit);
 106 __exctype (islower);
 107 __exctype (isgraph);
 108 __exctype (isprint);
 109 __exctype (ispunct);
 110 __exctype (isspace);
 111 __exctype (isupper);
 112 __exctype (isxdigit);
 113
 114
 115 /* Return the lowercase version of C.  */
 116 extern int tolower (int __c) __THROW;
 117
 118 /* Return the uppercase version of C.  */
 119 extern int toupper (int __c) __THROW;
 120
 121 __END_NAMESPACE_STD
 122
 123
 124 /* ISO C99 introduced one new function.  */
 125 #ifdef  __USE_ISOC99
 126 __BEGIN_NAMESPACE_C99
 127
 128 __exctype (isblank);
 129
 130 __END_NAMESPACE_C99
 131 #endif
 132
 133 #ifdef __USE_GNU
 134 /* Test C for a set of character classes according to MASK.  */
 135 extern int isctype (int __c, int __mask) __THROW;
 136 #endif
 137
 138 #if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
 139
 140 /* Return nonzero iff C is in the ASCII set
 141    (i.e., is no more than 7 bits wide).  */
 142 extern int isascii (int __c) __THROW;
 143
 144 /* Return the part of C that is in the ASCII set
 145    (i.e., the low-order 7 bits of C).  */
 146 extern int toascii (int __c) __THROW;
 147
 148 /* These are the same as `toupper' and `tolower' except that they do not
 149    check the argument for being in the range of a `char'.  */
 150 __exctype (_toupper);
 151 __exctype (_tolower);
 152 #endif /* Use SVID or use misc.  */
 153
 154 /* This code is needed for the optimized mapping functions.  */
 155 #define __tobody(c, f, a, args) \
 156   (__extension__                                                              \
 157    ({ int __res;                                                              \
 158       if (sizeof (c) > 1)                                                     \
 159         {                                                                     \
 160           if (__builtin_constant_p (c))                                       \
 161             {                                                                 \
 162               int __c = (c);                                                  \
 163               __res = __c < -128 || __c > 255 ? __c : (a)[__c];               \
 164             }                                                                 \
 165           else                                                                \
 166             __res = f args;                                                   \
 167         }                                                                     \
 168       else                                                                    \
 169         __res = (a)[(int) (c)];                                               \
 170       __res; }))
 171
 172 #if !defined __NO_CTYPE && !defined __cplusplus
 173 # define isalnum(c)     __isctype((c), _ISalnum)
 174 # define isalpha(c)     __isctype((c), _ISalpha)
 175 # define iscntrl(c)     __isctype((c), _IScntrl)
 176 # define isdigit(c)     __isctype((c), _ISdigit)
 177 # define islower(c)     __isctype((c), _ISlower)
 178 # define isgraph(c)     __isctype((c), _ISgraph)
 179 # define isprint(c)     __isctype((c), _ISprint)
 180 # define ispunct(c)     __isctype((c), _ISpunct)
 181 # define isspace(c)     __isctype((c), _ISspace)
 182 # define isupper(c)     __isctype((c), _ISupper)
 183 # define isxdigit(c)    __isctype((c), _ISxdigit)
 184
 185 # ifdef __USE_ISOC99
 186 #  define isblank(c)    __isctype((c), _ISblank)
 187 # endif
 188
 189 # ifdef __USE_EXTERN_INLINES
 190 __extern_inline int
 191 __NTH (tolower (int __c))
 192 {
 193   return __c >= -128 && __c < 256 ? (*__ctype_tolower_loc ())[__c] : __c;
 194 }
 195
 196 __extern_inline int
 197 __NTH (toupper (int __c))
 198 {
 199   return __c >= -128 && __c < 256 ? (*__ctype_toupper_loc ())[__c] : __c;
 200 }
 201 # endif
 202
 203 # if __GNUC__ >= 2 && defined __OPTIMIZE__ && !defined __cplusplus
 204 #  define tolower(c)    __tobody (c, tolower, *__ctype_tolower_loc (), (c))
 205 #  define toupper(c)    __tobody (c, toupper, *__ctype_toupper_loc (), (c))
 206 # endif /* Optimizing gcc */
 207
 208 # if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
 209 #  define isascii(c)    __isascii (c)
 210 #  define toascii(c)    __toascii (c)
 211
 212 #  define _tolower(c)   ((int) (*__ctype_tolower_loc ())[(int) (c)])
 213 #  define _toupper(c)   ((int) (*__ctype_toupper_loc ())[(int) (c)])
 214 # endif
 215
 216 #endif /* Not __NO_CTYPE.  */
 217
 218
 219 #ifdef __USE_GNU
 220 /* The concept of one static locale per category is not very well
 221    thought out.  Many applications will need to process its data using
 222    information from several different locales.  Another application is
 223    the implementation of the internationalization handling in the
 224    upcoming ISO C++ standard library.  To support this another set of
 225    the functions using locale data exist which have an additional
 226    argument.
 227
 228    Attention: all these functions are *not* standardized in any form.
 229    This is a proof-of-concept implementation.  */
 230
 231 /* Structure for reentrant locale using functions.  This is an
 232    (almost) opaque type for the user level programs.  */
 233 # include <xlocale.h>
 234
 235 /* These definitions are similar to the ones above but all functions
 236    take as an argument a handle for the locale which shall be used.  */
 237 #  define __isctype_l(c, type, locale) \
 238   ((locale)->__ctype_b[(int) (c)] & (unsigned short int) type)
 239
 240 # define __exctype_l(name)                                                    \
 241   extern int name (int, __locale_t) __THROW
 242
 243 /* The following names are all functions:
 244      int isCHARACTERISTIC(int c, locale_t *locale);
 245    which return nonzero iff C has CHARACTERISTIC.
 246    For the meaning of the characteristic names, see the `enum' above.  */
 247 __exctype_l (isalnum_l);
 248 __exctype_l (isalpha_l);
 249 __exctype_l (iscntrl_l);
 250 __exctype_l (isdigit_l);
 251 __exctype_l (islower_l);
 252 __exctype_l (isgraph_l);
 253 __exctype_l (isprint_l);
 254 __exctype_l (ispunct_l);
 255 __exctype_l (isspace_l);
 256 __exctype_l (isupper_l);
 257 __exctype_l (isxdigit_l);
 258
 259 __exctype_l (isblank_l);
 260
 261
 262 /* Return the lowercase version of C in locale L.  */
 263 extern int __tolower_l (int __c, __locale_t __l) __THROW;
 264 extern int tolower_l (int __c, __locale_t __l) __THROW;
 265
 266 /* Return the uppercase version of C.  */
 267 extern int __toupper_l (int __c, __locale_t __l) __THROW;
 268 extern int toupper_l (int __c, __locale_t __l) __THROW;
 269
 270 # if __GNUC__ >= 2 && defined __OPTIMIZE__ && !defined __cplusplus
 271 #  define __tolower_l(c, locale) \
 272   __tobody (c, __tolower_l, (locale)->__ctype_tolower, (c, locale))
 273 #  define __toupper_l(c, locale) \
 274   __tobody (c, __toupper_l, (locale)->__ctype_toupper, (c, locale))
 275 #  define tolower_l(c, locale)  __tolower_l ((c), (locale))
 276 #  define toupper_l(c, locale)  __toupper_l ((c), (locale))
 277 # endif /* Optimizing gcc */
 278
 279
 280 # ifndef __NO_CTYPE
 281 #  define __isalnum_l(c,l)      __isctype_l((c), _ISalnum, (l))
 282 #  define __isalpha_l(c,l)      __isctype_l((c), _ISalpha, (l))
 283 #  define __iscntrl_l(c,l)      __isctype_l((c), _IScntrl, (l))
 284 #  define __isdigit_l(c,l)      __isctype_l((c), _ISdigit, (l))
 285 #  define __islower_l(c,l)      __isctype_l((c), _ISlower, (l))
 286 #  define __isgraph_l(c,l)      __isctype_l((c), _ISgraph, (l))
 287 #  define __isprint_l(c,l)      __isctype_l((c), _ISprint, (l))
 288 #  define __ispunct_l(c,l)      __isctype_l((c), _ISpunct, (l))
 289 #  define __isspace_l(c,l)      __isctype_l((c), _ISspace, (l))
 290 #  define __isupper_l(c,l)      __isctype_l((c), _ISupper, (l))
 291 #  define __isxdigit_l(c,l)     __isctype_l((c), _ISxdigit, (l))
 292
 293 #  define __isblank_l(c,l)      __isctype_l((c), _ISblank, (l))
 294
 295 #  if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
 296 #   define __isascii_l(c,l)     ((l), __isascii (c))
 297 #   define __toascii_l(c,l)     ((l), __toascii (c))
 298 #  endif
 299
 300 #  define isalnum_l(c,l)        __isalnum_l ((c), (l))
 301 #  define isalpha_l(c,l)        __isalpha_l ((c), (l))
 302 #  define iscntrl_l(c,l)        __iscntrl_l ((c), (l))
 303 #  define isdigit_l(c,l)        __isdigit_l ((c), (l))
 304 #  define islower_l(c,l)        __islower_l ((c), (l))
 305 #  define isgraph_l(c,l)        __isgraph_l ((c), (l))
 306 #  define isprint_l(c,l)        __isprint_l ((c), (l))
 307 #  define ispunct_l(c,l)        __ispunct_l ((c), (l))
 308 #  define isspace_l(c,l)        __isspace_l ((c), (l))
 309 #  define isupper_l(c,l)        __isupper_l ((c), (l))
 310 #  define isxdigit_l(c,l)       __isxdigit_l ((c), (l))
 311
 312 #  define isblank_l(c,l)        __isblank_l ((c), (l))
 313
 314 #  if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
 315 #   define isascii_l(c,l)       __isascii_l ((c), (l))
 316 #   define toascii_l(c,l)       __toascii_l ((c), (l))
 317 #  endif
 318
 319 # endif /* Not __NO_CTYPE.  */
 320
 321 #endif /* Use GNU.  */
 322
 323 __END_DECLS
 324
 325 #endif /* ctype.h  */