newlib/libc/stdlib/mbstowcs_r.c

   1 #include <stdlib.h>
   2 #include <wchar.h>
   3 #include "local.h"
   4
   5 size_t
   6 _mbstowcs_r (struct _reent *r,
   7         wchar_t       *__restrict pwcs,
   8         const char    *__restrict s,
   9         size_t         n,
  10         mbstate_t     *state)
  11 {
  12   size_t ret = 0;
  13   char *t = (char *)s;
  14   int bytes;
  15
  16   if (!pwcs)
  17     n = (size_t) 1; /* Value doesn't matter as long as it's not 0. */
  18   while (n > 0)
  19     {
  20       bytes = __MBTOWC (r, pwcs, t, MB_CUR_MAX, state);
  21       if (bytes < 0)
  22         {
  23           state->__count = 0;
  24           return -1;
  25         }
  26       else if (bytes == 0)
  27         break;
  28       t += bytes;
  29       ++ret;
  30       if (pwcs)
  31         {
  32           ++pwcs;
  33           --n;
  34         }
  35     }
  36   return ret;
  37 }