ctype/ctype.h

   1 /* Copyright (C) 1991-2017 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      ISO C99 Standard 7.4: Character handling        <ctype.h>
  20  */
  21
  22 #ifndef _CTYPE_H
  23 #define _CTYPE_H        1
  24
  25 #include <features.h>
  26 #include <bits/types.h>
  27
  28 __BEGIN_DECLS
  29
  30 #ifndef _ISbit
  31 /* These are all the characteristics of characters.
  32    If there get to be more than 16 distinct characteristics,
  33    many things must be changed that use `unsigned short int's.
  34
  35    The characteristics are stored always in network byte order (big
  36    endian).  We define the bit value interpretations here dependent on the
  37    machine's byte order.  */
  38
  39 # include <endian.h>
  40 # if __BYTE_ORDER == __BIG_ENDIAN
  41 #  define _ISbit(bit)   (1 << (bit))
  42 # else /* __BYTE_ORDER == __LITTLE_ENDIAN */
  43 #  define _ISbit(bit)   ((bit) < 8 ? ((1 << (bit)) << 8) : ((1 << (bit)) >> 8))
  44 # endif
  45
  46 enum
  47 {
  48   _ISupper = _ISbit (0),        /* UPPERCASE.  */
  49   _ISlower = _ISbit (1),        /* lowercase.  */
  50   _ISalpha = _ISbit (2),        /* Alphabetic.  */
  51   _ISdigit = _ISbit (3),        /* Numeric.  */
  52   _ISxdigit = _ISbit (4),       /* Hexadecimal numeric.  */
  53   _ISspace = _ISbit (5),        /* Whitespace.  */
  54   _ISprint = _ISbit (6),        /* Printing.  */
  55   _ISgraph = _ISbit (7),        /* Graphical.  */
  56   _ISblank = _ISbit (8),        /* Blank (usually SPC and TAB).  */
  57   _IScntrl = _ISbit (9),        /* Control character.  */
  58   _ISpunct = _ISbit (10),       /* Punctuation.  */
  59   _ISalnum = _ISbit (11)        /* Alphanumeric.  */
  60 };
  61 #endif /* ! _ISbit  */
  62
  63 /* These are defined in ctype-info.c.
  64    The declarations here must match those in localeinfo.h.
  65
  66    In the thread-specific locale model (see `uselocale' in <locale.h>)
  67    we cannot use global variables for these as was done in the past.
  68    Instead, the following accessor functions return the address of
  69    each variable, which is local to the current thread if multithreaded.
  70
  71    These point into arrays of 384, so they can be indexed by any `unsigned
  72    char' value [0,255]; by EOF (-1); or by any `signed char' value
  73    [-128,-1).  ISO C requires that the ctype functions work for `unsigned
  74    char' values and for EOF; we also support negative `signed char' values
  75    for broken old programs.  The case conversion arrays are of `int's
  76    rather than `unsigned char's because tolower (EOF) must be EOF, which
  77    doesn't fit into an `unsigned char'.  But today more important is that
  78    the arrays are also used for multi-byte character sets.  */
  79 extern const unsigned short int **__ctype_b_loc (void)
  80      __THROW __attribute__ ((__const__));
  81 extern const __int32_t **__ctype_tolower_loc (void)
  82      __THROW __attribute__ ((__const__));
  83 extern const __int32_t **__ctype_toupper_loc (void)
  84      __THROW __attribute__ ((__const__));
  85
  86
  87 #ifndef __cplusplus
  88 # define __isctype(c, type) \
  89   ((*__ctype_b_loc ())[(int) (c)] & (unsigned short int) type)
  90 #elif defined __USE_EXTERN_INLINES
  91 # define __isctype_f(type) \
  92   __extern_inline int                                                         \
  93   is##type (int __c) __THROW                                                  \
  94   {                                                                           \
  95     return (*__ctype_b_loc ())[(int) (__c)] & (unsigned short int) _IS##type; \
  96   }
  97 #endif
  98
  99 #define __isascii(c)    (((c) & ~0x7f) == 0)    /* If C is a 7 bit value.  */
 100 #define __toascii(c)    ((c) & 0x7f)            /* Mask off high bits.  */
 101
 102 #define __exctype(name) extern int name (int) __THROW
 103
 104 __BEGIN_NAMESPACE_STD
 105
 106 /* The following names are all functions:
 107      int isCHARACTERISTIC(int c);
 108    which return nonzero iff C has CHARACTERISTIC.
 109    For the meaning of the characteristic names, see the `enum' above.  */
 110 __exctype (isalnum);
 111 __exctype (isalpha);
 112 __exctype (iscntrl);
 113 __exctype (isdigit);
 114 __exctype (islower);
 115 __exctype (isgraph);
 116 __exctype (isprint);
 117 __exctype (ispunct);
 118 __exctype (isspace);
 119 __exctype (isupper);
 120 __exctype (isxdigit);
 121
 122
 123 /* Return the lowercase version of C.  */
 124 extern int tolower (int __c) __THROW;
 125
 126 /* Return the uppercase version of C.  */
 127 extern int toupper (int __c) __THROW;
 128
 129 __END_NAMESPACE_STD
 130
 131
 132 /* ISO C99 introduced one new function.  */
 133 #ifdef  __USE_ISOC99
 134 __BEGIN_NAMESPACE_C99
 135
 136 __exctype (isblank);
 137
 138 __END_NAMESPACE_C99
 139 #endif
 140
 141 #ifdef __USE_GNU
 142 /* Test C for a set of character classes according to MASK.  */
 143 extern int isctype (int __c, int __mask) __THROW;
 144 #endif
 145
 146 #if defined __USE_MISC || defined __USE_XOPEN
 147
 148 /* Return nonzero iff C is in the ASCII set
 149    (i.e., is no more than 7 bits wide).  */
 150 extern int isascii (int __c) __THROW;
 151
 152 /* Return the part of C that is in the ASCII set
 153    (i.e., the low-order 7 bits of C).  */
 154 extern int toascii (int __c) __THROW;
 155
 156 /* These are the same as `toupper' and `tolower' except that they do not
 157    check the argument for being in the range of a `char'.  */
 158 __exctype (_toupper);
 159 __exctype (_tolower);
 160 #endif /* Use X/Open or use misc.  */
 161
 162 /* This code is needed for the optimized mapping functions.  */
 163 #define __tobody(c, f, a, args) \
 164   (__extension__                                                              \
 165    ({ int __res;                                                              \
 166       if (sizeof (c) > 1)                                                     \
 167         {                                                                     \
 168           if (__builtin_constant_p (c))                                       \
 169             {                                                                 \
 170               int __c = (c);                                                  \
 171               __res = __c < -128 || __c > 255 ? __c : (a)[__c];               \
 172             }                                                                 \
 173           else                                                                \
 174             __res = f args;                                                   \
 175         }                                                                     \
 176       else                                                                    \
 177         __res = (a)[(int) (c)];                                               \
 178       __res; }))
 179
 180 #if !defined __NO_CTYPE
 181 # ifdef __isctype_f
 182 __isctype_f (alnum)
 183 __isctype_f (alpha)
 184 __isctype_f (cntrl)
 185 __isctype_f (digit)
 186 __isctype_f (lower)
 187 __isctype_f (graph)
 188 __isctype_f (print)
 189 __isctype_f (punct)
 190 __isctype_f (space)
 191 __isctype_f (upper)
 192 __isctype_f (xdigit)
 193 #  ifdef __USE_ISOC99
 194 __isctype_f (blank)
 195 #  endif
 196 # elif defined __isctype
 197 # define isalnum(c)     __isctype((c), _ISalnum)
 198 # define isalpha(c)     __isctype((c), _ISalpha)
 199 # define iscntrl(c)     __isctype((c), _IScntrl)
 200 # define isdigit(c)     __isctype((c), _ISdigit)
 201 # define islower(c)     __isctype((c), _ISlower)
 202 # define isgraph(c)     __isctype((c), _ISgraph)
 203 # define isprint(c)     __isctype((c), _ISprint)
 204 # define ispunct(c)     __isctype((c), _ISpunct)
 205 # define isspace(c)     __isctype((c), _ISspace)
 206 # define isupper(c)     __isctype((c), _ISupper)
 207 # define isxdigit(c)    __isctype((c), _ISxdigit)
 208 #  ifdef __USE_ISOC99
 209 #   define isblank(c)   __isctype((c), _ISblank)
 210 #  endif
 211 # endif
 212
 213 # ifdef __USE_EXTERN_INLINES
 214 __extern_inline int
 215 __NTH (tolower (int __c))
 216 {
 217   return __c >= -128 && __c < 256 ? (*__ctype_tolower_loc ())[__c] : __c;
 218 }
 219
 220 __extern_inline int
 221 __NTH (toupper (int __c))
 222 {
 223   return __c >= -128 && __c < 256 ? (*__ctype_toupper_loc ())[__c] : __c;
 224 }
 225 # endif
 226
 227 # if __GNUC__ >= 2 && defined __OPTIMIZE__ && !defined __cplusplus
 228 #  define tolower(c)    __tobody (c, tolower, *__ctype_tolower_loc (), (c))
 229 #  define toupper(c)    __tobody (c, toupper, *__ctype_toupper_loc (), (c))
 230 # endif /* Optimizing gcc */
 231
 232 # if defined __USE_MISC || defined __USE_XOPEN
 233 #  define isascii(c)    __isascii (c)
 234 #  define toascii(c)    __toascii (c)
 235
 236 #  define _tolower(c)   ((int) (*__ctype_tolower_loc ())[(int) (c)])
 237 #  define _toupper(c)   ((int) (*__ctype_toupper_loc ())[(int) (c)])
 238 # endif
 239
 240 #endif /* Not __NO_CTYPE.  */
 241
 242
 243 #ifdef __USE_XOPEN2K8
 244 /* The concept of one static locale per category is not very well
 245    thought out.  Many applications will need to process its data using
 246    information from several different locales.  Another application is
 247    the implementation of the internationalization handling in the
 248    upcoming ISO C++ standard library.  To support this another set of
 249    the functions using locale data exist which have an additional
 250    argument.
 251
 252    Attention: all these functions are *not* standardized in any form.
 253    This is a proof-of-concept implementation.  */
 254
 255 /* Structure for reentrant locale using functions.  This is an
 256    (almost) opaque type for the user level programs.  */
 257 # include <xlocale.h>
 258
 259 /* These definitions are similar to the ones above but all functions
 260    take as an argument a handle for the locale which shall be used.  */
 261 #  define __isctype_l(c, type, locale) \
 262   ((locale)->__ctype_b[(int) (c)] & (unsigned short int) type)
 263
 264 # define __exctype_l(name)                                                    \
 265   extern int name (int, __locale_t) __THROW
 266
 267 /* The following names are all functions:
 268      int isCHARACTERISTIC(int c, locale_t *locale);
 269    which return nonzero iff C has CHARACTERISTIC.
 270    For the meaning of the characteristic names, see the `enum' above.  */
 271 __exctype_l (isalnum_l);
 272 __exctype_l (isalpha_l);
 273 __exctype_l (iscntrl_l);
 274 __exctype_l (isdigit_l);
 275 __exctype_l (islower_l);
 276 __exctype_l (isgraph_l);
 277 __exctype_l (isprint_l);
 278 __exctype_l (ispunct_l);
 279 __exctype_l (isspace_l);
 280 __exctype_l (isupper_l);
 281 __exctype_l (isxdigit_l);
 282
 283 __exctype_l (isblank_l);
 284
 285
 286 /* Return the lowercase version of C in locale L.  */
 287 extern int __tolower_l (int __c, __locale_t __l) __THROW;
 288 extern int tolower_l (int __c, __locale_t __l) __THROW;
 289
 290 /* Return the uppercase version of C.  */
 291 extern int __toupper_l (int __c, __locale_t __l) __THROW;
 292 extern int toupper_l (int __c, __locale_t __l) __THROW;
 293
 294 # if __GNUC__ >= 2 && defined __OPTIMIZE__ && !defined __cplusplus
 295 #  define __tolower_l(c, locale) \
 296   __tobody (c, __tolower_l, (locale)->__ctype_tolower, (c, locale))
 297 #  define __toupper_l(c, locale) \
 298   __tobody (c, __toupper_l, (locale)->__ctype_toupper, (c, locale))
 299 #  define tolower_l(c, locale)  __tolower_l ((c), (locale))
 300 #  define toupper_l(c, locale)  __toupper_l ((c), (locale))
 301 # endif /* Optimizing gcc */
 302
 303
 304 # ifndef __NO_CTYPE
 305 #  define __isalnum_l(c,l)      __isctype_l((c), _ISalnum, (l))
 306 #  define __isalpha_l(c,l)      __isctype_l((c), _ISalpha, (l))
 307 #  define __iscntrl_l(c,l)      __isctype_l((c), _IScntrl, (l))
 308 #  define __isdigit_l(c,l)      __isctype_l((c), _ISdigit, (l))
 309 #  define __islower_l(c,l)      __isctype_l((c), _ISlower, (l))
 310 #  define __isgraph_l(c,l)      __isctype_l((c), _ISgraph, (l))
 311 #  define __isprint_l(c,l)      __isctype_l((c), _ISprint, (l))
 312 #  define __ispunct_l(c,l)      __isctype_l((c), _ISpunct, (l))
 313 #  define __isspace_l(c,l)      __isctype_l((c), _ISspace, (l))
 314 #  define __isupper_l(c,l)      __isctype_l((c), _ISupper, (l))
 315 #  define __isxdigit_l(c,l)     __isctype_l((c), _ISxdigit, (l))
 316
 317 #  define __isblank_l(c,l)      __isctype_l((c), _ISblank, (l))
 318
 319 #  ifdef __USE_MISC
 320 #   define __isascii_l(c,l)     ((l), __isascii (c))
 321 #   define __toascii_l(c,l)     ((l), __toascii (c))
 322 #  endif
 323
 324 #  define isalnum_l(c,l)        __isalnum_l ((c), (l))
 325 #  define isalpha_l(c,l)        __isalpha_l ((c), (l))
 326 #  define iscntrl_l(c,l)        __iscntrl_l ((c), (l))
 327 #  define isdigit_l(c,l)        __isdigit_l ((c), (l))
 328 #  define islower_l(c,l)        __islower_l ((c), (l))
 329 #  define isgraph_l(c,l)        __isgraph_l ((c), (l))
 330 #  define isprint_l(c,l)        __isprint_l ((c), (l))
 331 #  define ispunct_l(c,l)        __ispunct_l ((c), (l))
 332 #  define isspace_l(c,l)        __isspace_l ((c), (l))
 333 #  define isupper_l(c,l)        __isupper_l ((c), (l))
 334 #  define isxdigit_l(c,l)       __isxdigit_l ((c), (l))
 335
 336 #  define isblank_l(c,l)        __isblank_l ((c), (l))
 337
 338 #  ifdef __USE_MISC
 339 #   define isascii_l(c,l)       __isascii_l ((c), (l))
 340 #   define toascii_l(c,l)       __toascii_l ((c), (l))
 341 #  endif
 342
 343 # endif /* Not __NO_CTYPE.  */
 344
 345 #endif /* Use POSIX 2008.  */
 346
 347 __END_DECLS
 348
 349 #endif /* ctype.h  */