stdio-common/_i18n_number.h

   1 /* Copyright (C) 2000, 2004, 2008 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.org>, 2000.
   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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <wchar.h>
  20 #include <wctype.h>
  21
  22 #include "../locale/outdigits.h"
  23 #include "../locale/outdigitswc.h"
  24
  25 static CHAR_T *
  26 _i18n_number_rewrite (CHAR_T *w, CHAR_T *rear_ptr, CHAR_T *end)
  27 {
  28 #ifdef COMPILE_WPRINTF
  29 # define decimal NULL
  30 # define thousands NULL
  31 #else
  32   char decimal[MB_LEN_MAX + 1];
  33   char thousands[MB_LEN_MAX + 1];
  34 #endif
  35
  36   /* "to_outpunct" is a map from ASCII decimal point and thousands-sep
  37      to their equivalent in locale. This is defined for locales which
  38      use extra decimal point and thousands-sep.  */
  39   wctrans_t map = __wctrans ("to_outpunct");
  40   wint_t wdecimal = __towctrans (L'.', map);
  41   wint_t wthousands = __towctrans (L',', map);
  42
  43 #ifndef COMPILE_WPRINTF
  44   if (__builtin_expect (map != NULL, 0))
  45     {
  46       mbstate_t state;
  47       memset (&state, '\0', sizeof (state));
  48
  49       size_t n = __wcrtomb (decimal, wdecimal, &state);
  50       if (n == (size_t) -1)
  51         memcpy (decimal, ".", 2);
  52       else
  53         decimal[n] = '\0';
  54
  55       memset (&state, '\0', sizeof (state));
  56
  57       n = __wcrtomb (thousands, wthousands, &state);
  58       if (n == (size_t) -1)
  59         memcpy (thousands, ",", 2);
  60       else
  61         thousands[n] = '\0';
  62     }
  63 #endif
  64
  65   /* Copy existing string so that nothing gets overwritten.  */
  66   CHAR_T *src;
  67   bool use_alloca = __libc_use_alloca ((rear_ptr - w) * sizeof (CHAR_T));
  68   if (__builtin_expect (use_alloca, true))
  69     src = (CHAR_T *) alloca ((rear_ptr - w) * sizeof (CHAR_T));
  70   else
  71     {
  72       src = (CHAR_T *) malloc ((rear_ptr - w) * sizeof (CHAR_T));
  73       if (src == NULL)
  74         /* If we cannot allocate the memory don't rewrite the string.
  75            It is better than nothing.  */
  76         return w;
  77     }
  78
  79   CHAR_T *s = (CHAR_T *) __mempcpy (src, w,
  80                                     (rear_ptr - w) * sizeof (CHAR_T));
  81
  82   w = end;
  83
  84   /* Process all characters in the string.  */
  85   while (--s >= src)
  86     {
  87       if (*s >= '0' && *s <= '9')
  88         {
  89           if (sizeof (CHAR_T) == 1)
  90             w = (CHAR_T *) outdigit_value ((char *) w, *s - '0');
  91           else
  92             *--w = (CHAR_T) outdigitwc_value (*s - '0');
  93         }
  94       else if (__builtin_expect (map == NULL, 1) || (*s != '.' && *s != ','))
  95         *--w = *s;
  96       else
  97         {
  98           if (sizeof (CHAR_T) == 1)
  99             {
 100               const char *outpunct = *s == '.' ? decimal : thousands;
 101               size_t dlen = strlen (outpunct);
 102
 103               w -= dlen;
 104               while (dlen-- > 0)
 105                 w[dlen] = outpunct[dlen];
 106             }
 107           else
 108             *--w = *s == '.' ? (CHAR_T) wdecimal : (CHAR_T) wthousands;
 109         }
 110     }
 111
 112   if (! use_alloca)
 113     free (src);
 114
 115   return w;
 116 }