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glibc  2.9
Defines | Functions | Variables
wcsnrtombs.c File Reference
#include <assert.h>
#include <dlfcn.h>
#include <errno.h>
#include <gconv.h>
#include <wchar.h>
#include <wcsmbsload.h>
#include <sysdep.h>

Go to the source code of this file.

Defines

#define EILSEQ   EINVAL

Functions

size_t __wcsnrtombs (char *dst, const wchar_t **src, size_t nwc, size_t len, mbstate_t *ps)

Variables

static mbstate_t state

Define Documentation

#define EILSEQ   EINVAL

Definition at line 30 of file wcsnrtombs.c.


Function Documentation

size_t __wcsnrtombs ( char *  dst,
const wchar_t **  src,
size_t  nwc,
size_t  len,
mbstate_t ps 
)

Definition at line 41 of file wcsnrtombs.c.

{
  struct __gconv_step_data data;
  const wchar_t *srcend;
  int status;
  size_t result;
  struct __gconv_step *tomb;
  const struct gconv_fcts *fcts;

  /* Tell where we want the result.  */
  data.__invocation_counter = 0;
  data.__internal_use = 1;
  data.__flags = __GCONV_IS_LAST;
  data.__statep = ps ?: &state;
  data.__trans = NULL;

  if (nwc == 0)
    return 0;
  srcend = *src + __wcsnlen (*src, nwc - 1) + 1;

  /* Get the conversion functions.  */
  fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));

  /* Get the structure with the function pointers.  */
  tomb = fcts->tomb;
  __gconv_fct fct = tomb->__fct;
#ifdef PTR_DEMANGLE
  if (tomb->__shlib_handle != NULL)
    PTR_DEMANGLE (fct);
#endif

  /* We have to handle DST == NULL special.  */
  if (dst == NULL)
    {
      unsigned char buf[256];             /* Just an arbitrary value.  */
      const unsigned char *inbuf = (const unsigned char *) *src;
      size_t dummy;

      result = 0;
      data.__outbufend = buf + sizeof (buf);

      do
       {
         data.__outbuf = buf;

         status = DL_CALL_FCT (fct, (tomb, &data, &inbuf,
                                  (const unsigned char *) srcend, NULL,
                                  &dummy, 0, 1));

         /* Count the number of bytes.  */
         result += data.__outbuf - buf;
       }
      while (status == __GCONV_FULL_OUTPUT);

      if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
         && data.__outbuf[-1] == '\0')
       /* Don't count the NUL character in.  */
       --result;
    }
  else
    {
      /* This code is based on the safe assumption that all internal
        multi-byte encodings use the NUL byte only to mark the end
        of the string.  */
      size_t dummy;

      data.__outbuf = (unsigned char *) dst;
      data.__outbufend = (unsigned char *) dst + len;

      status = DL_CALL_FCT (fct, (tomb, &data, (const unsigned char **) src,
                              (const unsigned char *) srcend, NULL,
                              &dummy, 0, 1));

      /* Count the number of bytes.  */
      result = data.__outbuf - (unsigned char *) dst;

      /* We have to determine whether the last character converted
        is the NUL character.  */
      if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
         && data.__outbuf[-1] == '\0')
       {
         assert (data.__outbuf != (unsigned char *) dst);
         assert (__mbsinit (data.__statep));
         *src = NULL;
         --result;
       }
    }

  /* There must not be any problems with the conversion but illegal input
     characters.  */
  assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
         || status == __GCONV_ILLEGAL_INPUT
         || status == __GCONV_INCOMPLETE_INPUT
         || status == __GCONV_FULL_OUTPUT);

  if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
      && status != __GCONV_EMPTY_INPUT)
    {
      result = (size_t) -1;
      __set_errno (EILSEQ);
    }

  return result;
}

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Variable Documentation

mbstate_t state [static]

Definition at line 35 of file wcsnrtombs.c.