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glibc  2.9
Defines | Functions | Variables
mbrtowc.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 __mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)

Variables

static mbstate_t state

Define Documentation

#define EILSEQ   EINVAL

Definition at line 31 of file mbrtowc.c.


Function Documentation

size_t __mbrtowc ( wchar_t *  pwc,
const char *  s,
size_t  n,
mbstate_t ps 
)

Definition at line 38 of file mbrtowc.c.

{
  wchar_t buf[1];
  struct __gconv_step_data data;
  int status;
  size_t result;
  size_t dummy;
  const unsigned char *inbuf, *endbuf;
  unsigned char *outbuf = (unsigned char *) (pwc ?: buf);
  const struct gconv_fcts *fcts;

  /* Set information for this step.  */
  data.__invocation_counter = 0;
  data.__internal_use = 1;
  data.__flags = __GCONV_IS_LAST;
  data.__statep = ps ?: &state;
  data.__trans = NULL;

  /* A first special case is if S is NULL.  This means put PS in the
     initial state.  */
  if (s == NULL)
    {
      outbuf = (unsigned char *) buf;
      s = "";
      n = 1;
    }

  /* Tell where we want the result.  */
  data.__outbuf = outbuf;
  data.__outbufend = outbuf + sizeof (wchar_t);

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

  /* Do a normal conversion.  */
  inbuf = (const unsigned char *) s;
  endbuf = inbuf + n;
  if (__builtin_expect (endbuf < inbuf, 0))
    endbuf = (const unsigned char *) ~(uintptr_t) 0;
  __gconv_fct fct = fcts->towc->__fct;
#ifdef PTR_DEMANGLE
  if (fcts->towc->__shlib_handle != NULL)
    PTR_DEMANGLE (fct);
#endif
  status = DL_CALL_FCT (fct, (fcts->towc, &data, &inbuf, endbuf,
                           NULL, &dummy, 0, 1));

  /* There must not be any problems with the conversion but illegal input
     characters.  The output buffer must be large enough, otherwise the
     definition of MB_CUR_MAX is not correct.  All the other possible
     errors also must not happen.  */
  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_EMPTY_INPUT
      || status == __GCONV_FULL_OUTPUT)
    {
      if (data.__outbuf != (unsigned char *) outbuf
         && *(wchar_t *) outbuf == L'\0')
       {
         /* The converted character is the NUL character.  */
         assert (__mbsinit (data.__statep));
         result = 0;
       }
      else
       result = inbuf - (const unsigned char *) s;
    }
  else if (status == __GCONV_INCOMPLETE_INPUT)
    result = (size_t) -2;
  else
    {
      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 mbrtowc.c.