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glibc  2.9
Functions
wctob.c File Reference
#include <dlfcn.h>
#include <gconv.h>
#include <stdio.h>
#include <string.h>
#include <wchar.h>
#include <wcsmbsload.h>
#include <sysdep.h>

Go to the source code of this file.

Functions

int wctob (wint_t c)

Function Documentation

int wctob ( wint_t  c)

Definition at line 31 of file wctob.c.

{
  unsigned char buf[MB_LEN_MAX];
  struct __gconv_step_data data;
  wchar_t inbuf[1];
  wchar_t *inptr = inbuf;
  size_t dummy;
  int status;
  const struct gconv_fcts *fcts;

  if (c == WEOF)
    return EOF;

  /* We know that only ASCII compatible encodings are used for the
     locale and that the wide character encoding is ISO 10646.  */
  if (c >= L'\0' && c <= L'\x7f')
    return (int) c;

  /* Tell where we want the result.  */
  data.__outbuf = buf;
  data.__outbufend = buf + MB_LEN_MAX;
  data.__invocation_counter = 0;
  data.__internal_use = 1;
  data.__flags = __GCONV_IS_LAST;
  data.__statep = &data.__state;
  data.__trans = NULL;

  /* Make sure we start in the initial state.  */
  memset (&data.__state, '\0', sizeof (mbstate_t));

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

  /* Create the input string.  */
  inbuf[0] = c;

  const unsigned char *argptr = (const unsigned char *) inptr;
  __gconv_fct fct = fcts->tomb->__fct;
#ifdef PTR_DEMANGLE
  if (fcts->tomb->__shlib_handle != NULL)
    PTR_DEMANGLE (fct);
#endif
  status = DL_CALL_FCT (fct,
                     (fcts->tomb, &data, &argptr,
                      argptr + sizeof (inbuf[0]), NULL, &dummy, 0, 1));

  /* The conversion failed or the output is too long.  */
  if ((status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
       && status != __GCONV_EMPTY_INPUT)
      || data.__outbuf != (unsigned char *) (buf + 1))
    return EOF;

  return buf[0];
}

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