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glibc  2.9
Functions
iconv_open.c File Reference
#include <alloca.h>
#include <errno.h>
#include <iconv.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <gconv_int.h>
#include "gconv_charset.h"

Go to the source code of this file.

Functions

iconv_t iconv_open (const char *tocode, const char *fromcode)

Function Documentation

iconv_t iconv_open ( const char *  tocode,
const char *  fromcode 
)

Definition at line 33 of file iconv_open.c.

{
  /* Normalize the name.  We remove all characters beside alpha-numeric,
     '_', '-', '/', '.', and ':'.  */
  size_t tocode_len = strlen (tocode) + 3;
  char *tocode_conv;
  bool tocode_usealloca = __libc_use_alloca (tocode_len);
  if (tocode_usealloca)
    tocode_conv = (char *) alloca (tocode_len);
  else
    {
      tocode_conv = (char *) malloc (tocode_len);
      if (tocode_conv == NULL)
       return (iconv_t) -1;
    }
  strip (tocode_conv, tocode);
  tocode = (tocode_conv[2] == '\0' && tocode[0] != '\0'
           ? upstr (tocode_conv, tocode) : tocode_conv);

  size_t fromcode_len = strlen (fromcode) + 3;
  char *fromcode_conv;
  bool fromcode_usealloca = __libc_use_alloca (fromcode_len);
  if (fromcode_usealloca)
    fromcode_conv = (char *) alloca (fromcode_len);
  else
    {
      fromcode_conv = (char *) malloc (fromcode_len);
      if (fromcode_conv == NULL)
       {
         if (! tocode_usealloca)
           free (tocode_conv);
         return (iconv_t) -1;
       }
    }
  strip (fromcode_conv, fromcode);
  fromcode = (fromcode_conv[2] == '\0' && fromcode[0] != '\0'
             ? upstr (fromcode_conv, fromcode) : fromcode_conv);

  __gconv_t cd;
  int res = __gconv_open (tocode, fromcode, &cd, 0);

  if (! fromcode_usealloca)
    free (fromcode_conv);
  if (! tocode_usealloca)
    free (tocode_conv);

  if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
    {
      /* We must set the error number according to the specs.  */
      if (res == __GCONV_NOCONV || res == __GCONV_NODB)
       __set_errno (EINVAL);

      cd = (iconv_t) -1;
    }

  return (iconv_t) cd;
}

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