locale/lc-ctype.c

   1 /* Define current locale data for LC_CTYPE category.
   2    Copyright (C) 1995,1996,1997,1998,1999,2000,2002,2003,2005,2008
   3         Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include "localeinfo.h"
  22 #include <ctype.h>
  23 #include <endian.h>
  24 #include <stdint.h>
  25
  26 _NL_CURRENT_DEFINE (LC_CTYPE);
  27
  28 /* We are called after loading LC_CTYPE data to load it into
  29    the variables used by the ctype.h macros.  */
  30
  31
  32
  33 void
  34 _nl_postload_ctype (void)
  35 {
  36 #define current(type,x,offset) \
  37   ((const type *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_##x) + offset)
  38
  39   const union locale_data_value *const ctypes
  40     = _nl_global_locale.__locales[LC_CTYPE]->values;
  41
  42 /* These thread-local variables are defined in ctype-info.c.
  43    The declarations here must match those in localeinfo.h.
  44
  45    These point into arrays of 384, so they can be indexed by any `unsigned
  46    char' value [0,255]; by EOF (-1); or by any `signed char' value
  47    [-128,-1).  ISO C requires that the ctype functions work for `unsigned
  48    char' values and for EOF; we also support negative `signed char' values
  49    for broken old programs.  The case conversion arrays are of `int's
  50    rather than `unsigned char's because tolower (EOF) must be EOF, which
  51    doesn't fit into an `unsigned char'.  But today more important is that
  52    the arrays are also used for multi-byte character sets.
  53
  54    First we update the special members of _nl_global_locale as newlocale
  55    would.  This is necessary for uselocale (LC_GLOBAL_LOCALE) to find these
  56    values properly.  */
  57
  58   _nl_global_locale.__ctype_b = (const unsigned short int *)
  59     ctypes[_NL_ITEM_INDEX (_NL_CTYPE_CLASS)].string + 128;
  60   _nl_global_locale.__ctype_tolower = (const int *)
  61     ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOLOWER)].string + 128;
  62   _nl_global_locale.__ctype_toupper = (const int *)
  63     ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOUPPER)].string + 128;
  64
  65   /* Next we must set the thread-local caches if and only if this thread is
  66      in fact using the global locale.  */
  67   if (_NL_CURRENT_LOCALE == &_nl_global_locale)
  68     {
  69       __libc_tsd_set (const uint16_t *, CTYPE_B,
  70                       (void *) _nl_global_locale.__ctype_b);
  71       __libc_tsd_set (const int32_t *, CTYPE_TOUPPER,
  72                       (void *) _nl_global_locale.__ctype_toupper);
  73       __libc_tsd_set (const int32_t *, CTYPE_TOLOWER,
  74                       (void *) _nl_global_locale.__ctype_tolower);
  75     }
  76
  77 #include <shlib-compat.h>
  78 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3)
  79   /* We must use the exported names to access these so we are sure to
  80      be accessing the main executable's copy if it has COPY relocs.  */
  81
  82   extern __const unsigned short int *__ctype_b; /* Characteristics.  */
  83   extern __const __int32_t *__ctype_tolower; /* Case conversions.  */
  84   extern __const __int32_t *__ctype_toupper; /* Case conversions.  */
  85
  86   extern const uint32_t *__ctype32_b;
  87   extern const uint32_t *__ctype32_toupper;
  88   extern const uint32_t *__ctype32_tolower;
  89
  90   /* We need the .symver declarations these macros generate so that
  91      our references are explicitly bound to the versioned symbol names
  92      rather than the unadorned names that are not exported.  When the
  93      linker sees these bound to local symbols (as the unexported names are)
  94      then it doesn't generate a proper relocation to the global symbols.
  95      We need those relocations so that a versioned definition with a COPY
  96      reloc in an executable will override the libc.so definition.  */
  97
  98 compat_symbol (libc, __ctype_b, __ctype_b, GLIBC_2_0);
  99 compat_symbol (libc, __ctype_tolower, __ctype_tolower, GLIBC_2_0);
 100 compat_symbol (libc, __ctype_toupper, __ctype_toupper, GLIBC_2_0);
 101 compat_symbol (libc, __ctype32_b, __ctype32_b, GLIBC_2_0);
 102 compat_symbol (libc, __ctype32_tolower, __ctype32_tolower, GLIBC_2_2);
 103 compat_symbol (libc, __ctype32_toupper, __ctype32_toupper, GLIBC_2_2);
 104
 105   __ctype_b = current (uint16_t, CLASS, 128);
 106   __ctype_toupper = current (int32_t, TOUPPER, 128);
 107   __ctype_tolower = current (int32_t, TOLOWER, 128);
 108   __ctype32_b = current (uint32_t, CLASS32, 0);
 109   __ctype32_toupper = current (uint32_t, TOUPPER32, 0);
 110   __ctype32_tolower = current (uint32_t, TOLOWER32, 0);
 111 #endif
 112 }