locale/lc-ctype.c

   1 /* Define current locale data for LC_CTYPE category.
   2    Copyright (C) 1995,1996,1997,1998,1999,2000,2002,2003,2005,2008,2012
   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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include "localeinfo.h"
  21 #include <ctype.h>
  22 #include <endian.h>
  23 #include <stdint.h>
  24
  25 _NL_CURRENT_DEFINE (LC_CTYPE);
  26
  27 /* We are called after loading LC_CTYPE data to load it into
  28    the variables used by the ctype.h macros.  */
  29
  30
  31
  32 void
  33 _nl_postload_ctype (void)
  34 {
  35 #define current(type,x,offset) \
  36   ((const type *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_##x) + offset)
  37
  38   const union locale_data_value *const ctypes
  39     = _nl_global_locale.__locales[LC_CTYPE]->values;
  40
  41 /* These thread-local variables are defined in ctype-info.c.
  42    The declarations here must match those in localeinfo.h.
  43
  44    These point into arrays of 384, so they can be indexed by any `unsigned
  45    char' value [0,255]; by EOF (-1); or by any `signed char' value
  46    [-128,-1).  ISO C requires that the ctype functions work for `unsigned
  47    char' values and for EOF; we also support negative `signed char' values
  48    for broken old programs.  The case conversion arrays are of `int's
  49    rather than `unsigned char's because tolower (EOF) must be EOF, which
  50    doesn't fit into an `unsigned char'.  But today more important is that
  51    the arrays are also used for multi-byte character sets.
  52
  53    First we update the special members of _nl_global_locale as newlocale
  54    would.  This is necessary for uselocale (LC_GLOBAL_LOCALE) to find these
  55    values properly.  */
  56
  57   _nl_global_locale.__ctype_b = (const unsigned short int *)
  58     ctypes[_NL_ITEM_INDEX (_NL_CTYPE_CLASS)].string + 128;
  59   _nl_global_locale.__ctype_tolower = (const int *)
  60     ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOLOWER)].string + 128;
  61   _nl_global_locale.__ctype_toupper = (const int *)
  62     ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOUPPER)].string + 128;
  63
  64   /* Next we must set the thread-local caches if and only if this thread is
  65      in fact using the global locale.  */
  66   if (_NL_CURRENT_LOCALE == &_nl_global_locale)
  67     {
  68       __libc_tsd_set (const uint16_t *, CTYPE_B,
  69                       (void *) _nl_global_locale.__ctype_b);
  70       __libc_tsd_set (const int32_t *, CTYPE_TOUPPER,
  71                       (void *) _nl_global_locale.__ctype_toupper);
  72       __libc_tsd_set (const int32_t *, CTYPE_TOLOWER,
  73                       (void *) _nl_global_locale.__ctype_tolower);
  74     }
  75
  76 #include <shlib-compat.h>
  77 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3)
  78   /* We must use the exported names to access these so we are sure to
  79      be accessing the main executable's copy if it has COPY relocs.  */
  80
  81   extern const unsigned short int *__ctype_b; /* Characteristics.  */
  82   extern const __int32_t *__ctype_tolower; /* Case conversions.  */
  83   extern const __int32_t *__ctype_toupper; /* Case conversions.  */
  84
  85   extern const uint32_t *__ctype32_b;
  86   extern const uint32_t *__ctype32_toupper;
  87   extern const uint32_t *__ctype32_tolower;
  88
  89   /* We need the .symver declarations these macros generate so that
  90      our references are explicitly bound to the versioned symbol names
  91      rather than the unadorned names that are not exported.  When the
  92      linker sees these bound to local symbols (as the unexported names are)
  93      then it doesn't generate a proper relocation to the global symbols.
  94      We need those relocations so that a versioned definition with a COPY
  95      reloc in an executable will override the libc.so definition.  */
  96
  97 compat_symbol (libc, __ctype_b, __ctype_b, GLIBC_2_0);
  98 compat_symbol (libc, __ctype_tolower, __ctype_tolower, GLIBC_2_0);
  99 compat_symbol (libc, __ctype_toupper, __ctype_toupper, GLIBC_2_0);
 100 compat_symbol (libc, __ctype32_b, __ctype32_b, GLIBC_2_0);
 101 compat_symbol (libc, __ctype32_tolower, __ctype32_tolower, GLIBC_2_2);
 102 compat_symbol (libc, __ctype32_toupper, __ctype32_toupper, GLIBC_2_2);
 103
 104   __ctype_b = current (uint16_t, CLASS, 128);
 105   __ctype_toupper = current (int32_t, TOUPPER, 128);
 106   __ctype_tolower = current (int32_t, TOLOWER, 128);
 107   __ctype32_b = current (uint32_t, CLASS32, 0);
 108   __ctype32_toupper = current (uint32_t, TOUPPER32, 0);
 109   __ctype32_tolower = current (uint32_t, TOLOWER32, 0);
 110 #endif
 111 }