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

Go to the source code of this file.

Functions

wint_t __btowc (int c)

Function Documentation

wint_t __btowc ( int  c)

Definition at line 33 of file btowc.c.

{
  const struct gconv_fcts *fcts;

  /* If the parameter does not fit into one byte or it is the EOF value
     we can give the answer now.  */
  if (c < SCHAR_MIN || c > UCHAR_MAX || c == EOF)
    return WEOF;

  /* We know that only ASCII compatible encodings are used for the
     locale and that the wide character encoding is ISO 10646.  */
  if (isascii (c))
    return (wint_t) c;

  /* Get the conversion functions.  */
  fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
  __gconv_btowc_fct btowc_fct = fcts->towc->__btowc_fct;

  if (__builtin_expect (fcts->towc_nsteps == 1, 1)
      && __builtin_expect (btowc_fct != NULL, 1))
    {
      /* Use the shortcut function.  */
#ifdef PTR_DEMANGLE
      if (fcts->towc->__shlib_handle != NULL)
       PTR_DEMANGLE (btowc_fct);
#endif
      return DL_CALL_FCT (btowc_fct, (fcts->towc, (unsigned char) c));
    }
  else
    {
      /* Fall back to the slow but generic method.  */
      wchar_t result;
      struct __gconv_step_data data;
      unsigned char inbuf[1];
      const unsigned char *inptr = inbuf;
      size_t dummy;
      int status;

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

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

      __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, &inptr, inptr + 1,
                              NULL, &dummy, 0, 1));

      if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
         && status != __GCONV_EMPTY_INPUT)
       /* The conversion failed.  */
       result = WEOF;

      return result;
    }
}

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