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glibc  2.9
Defines | Functions | Variables
mbsnrtowcs.c File Reference
#include <assert.h>
#include <dlfcn.h>
#include <errno.h>
#include <gconv.h>
#include <string.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 __mbsnrtowcs (wchar_t *dst, const char **src, size_t nmc, size_t len, mbstate_t *ps)

Variables

static mbstate_t state

Define Documentation

#define EILSEQ   EINVAL

Definition at line 31 of file mbsnrtowcs.c.


Function Documentation

size_t __mbsnrtowcs ( wchar_t *  dst,
const char **  src,
size_t  nmc,
size_t  len,
mbstate_t ps 
)

Definition at line 42 of file mbsnrtowcs.c.

{
  const unsigned char *srcend;
  struct __gconv_step_data data;
  size_t result;
  int status;
  struct __gconv_step *towc;
  size_t dummy;
  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 (nmc == 0)
    return 0;
  srcend = (const unsigned char *) *src + __strnlen (*src, nmc - 1) + 1;

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

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

  /* We have to handle DST == NULL special.  */
  if (dst == NULL)
    {
      wchar_t buf[64];             /* Just an arbitrary size.  */
      const unsigned char *inbuf = (const unsigned char *) *src;

      result = 0;
      data.__outbufend = (unsigned char *) buf + sizeof (buf);
      do
       {
         data.__outbuf = (unsigned char *) buf;

         status = DL_CALL_FCT (fct, (towc, &data, &inbuf, srcend, NULL,
                                  &dummy, 0, 1));

         result += (wchar_t *) data.__outbuf - buf;
       }
      while (status == __GCONV_FULL_OUTPUT);

      if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
         && ((wchar_t *) data.__outbuf)[-1] == L'\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.  */
      data.__outbuf = (unsigned char *) dst;
      data.__outbufend = data.__outbuf + len * sizeof (wchar_t);

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

      result = (wchar_t *) data.__outbuf - dst;

      /* We have to determine whether the last character converted
        is the NUL character.  */
      if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
         && (assert (result > 0),
             ((wchar_t *) dst)[result - 1] == L'\0'))
       {
         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 && status != __GCONV_INCOMPLETE_INPUT)
    {
      result = (size_t) -1;
      __set_errno (EILSEQ);
    }

  return result;
}

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Variable Documentation

mbstate_t state [static]

Definition at line 36 of file mbsnrtowcs.c.