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glibc  2.9
Functions
_i18n_number.h File Reference
#include <wchar.h>
#include <wctype.h>
#include "../locale/outdigits.h"
#include "../locale/outdigitswc.h"
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Functions

static CHAR_T_i18n_number_rewrite (CHAR_T *w, CHAR_T *rear_ptr, CHAR_T *end)

Function Documentation

static CHAR_T* _i18n_number_rewrite ( CHAR_T w,
CHAR_T rear_ptr,
CHAR_T end 
) [static]

Definition at line 27 of file _i18n_number.h.

{
#ifdef COMPILE_WPRINTF
# define decimal NULL
# define thousands NULL
#else
  char decimal[MB_LEN_MAX];
  char thousands[MB_LEN_MAX];
#endif

  /* "to_outpunct" is a map from ASCII decimal point and thousands-sep
     to their equivalent in locale. This is defined for locales which
     use extra decimal point and thousands-sep.  */
  wctrans_t map = __wctrans ("to_outpunct");
  wint_t wdecimal = __towctrans (L'.', map);
  wint_t wthousands = __towctrans (L',', map);

#ifndef COMPILE_WPRINTF
  if (__builtin_expect (map != NULL, 0))
    {
      mbstate_t state;
      memset (&state, '\0', sizeof (state));

      if (__wcrtomb (decimal, wdecimal, &state) == (size_t) -1)
       memcpy (decimal, ".", 2);

      memset (&state, '\0', sizeof (state));

      if (__wcrtomb (thousands, wthousands, &state) == (size_t) -1)
       memcpy (thousands, ",", 2);
    }
#endif

  /* Copy existing string so that nothing gets overwritten.  */
  CHAR_T *src;
  bool use_alloca = __libc_use_alloca ((rear_ptr - w) * sizeof (CHAR_T));
  if (__builtin_expect (use_alloca, true))
    src = (CHAR_T *) alloca ((rear_ptr - w) * sizeof (CHAR_T));
  else
    {
      src = (CHAR_T *) malloc ((rear_ptr - w) * sizeof (CHAR_T));
      if (src == NULL)
       /* If we cannot allocate the memory don't rewrite the string.
          It is better than nothing.  */
       return w;
    }

  CHAR_T *s = (CHAR_T *) __mempcpy (src, w,
                                (rear_ptr - w) * sizeof (CHAR_T));

  w = end;

  /* Process all characters in the string.  */
  while (--s >= src)
    {
      if (*s >= '0' && *s <= '9')
       {
         if (sizeof (CHAR_T) == 1)
           w = (CHAR_T *) outdigit_value ((char *) w, *s - '0');
         else
           *--w = (CHAR_T) outdigitwc_value (*s - '0');
       }
      else if (__builtin_expect (map == NULL, 1) || (*s != '.' && *s != ','))
       *--w = *s;
      else
       {
         if (sizeof (CHAR_T) == 1)
           {
             const char *outpunct = *s == '.' ? decimal : thousands;
             size_t dlen = strlen (outpunct);

             w -= dlen;
             while (dlen-- > 0)
              w[dlen] = outpunct[dlen];
           }
         else
           *--w = *s == '.' ? (CHAR_T) wdecimal : (CHAR_T) wthousands;
       }
    }

  if (! use_alloca)
    free (src);

  return w;
}

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