libsent/src/util/charconv_iconv.c

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/*
 * Copyright (c) 1991-2006 Kawahara Lab., Kyoto University
 * Copyright (c) 2000-2005 Shikano Lab., Nara Institute of Science and Technology
 * Copyright (c) 2005-2006 Julius project team, Nagoya Institute of Technology
 * All rights reserved
 */

#include <sent/stddefs.h>

#ifdef CHARACTER_CONVERSION
#ifdef HAVE_ICONV

#include <iconv.h>
static iconv_t cd = (iconv_t)-1; 

boolean
charconv_iconv_setup(char *fromcode, char *tocode, boolean *enable_conv)
{
  /* clear already allocated descriptor */
  if (cd != (iconv_t)-1) {
    if (iconv_close(cd) < 0) {
      perror("j_prinf_set_iconv");
      return FALSE;
    }
    cd = (iconv_t)-1;
  }
  
  if (tocode == NULL) {
    /* disable conversion */
    *enable_conv = FALSE;
  } else {
    /* check for codes */
    if (fromcode == NULL) {
      j_printerr("Error: charset names of both input and output should be given.\n");
      j_printerr("Error: use \"-charconv from to\" instead of \"-kanji\".\n");
      *enable_conv = FALSE;
      return FALSE;
    }      
    /* allocate conversion descriptor */
    cd = iconv_open(tocode, fromcode);
    if (cd == (iconv_t)-1) {
      /* allocation failed */
      j_printerr("Error: unknown charset name in \"%s\" or \"%s\"\n", fromcode, tocode);
      j_printerr("Error: do \"iconv --list\" to get the list of available charset names.\n");
      *enable_conv = FALSE;
      return FALSE;
    }
    *enable_conv = TRUE;
  }
  return TRUE;
}

char *
charconv_iconv(char *instr, char *outstr, int maxoutlen)
{
  char *src, *dst;
  size_t srclen, dstlen;
  size_t ret;

  if (cd == (iconv_t)-1) {
    j_error("InternalError: codeconv: conversion descriptor not allocated\n");
  }
  srclen = strlen(instr)+1;
  dstlen = maxoutlen;
  src = instr;
  dst = outstr;
  ret = iconv(cd, &src, &srclen, &dst, &dstlen);
  if (ret == -1) {
    switch(errno) {
    case EILSEQ:
      j_error("InternalError: codeconv: invalid multibyte sequence in the input\n");
      break;
    case EINVAL:
      j_error("InternalError: codeconv: incomplete multibyte sequence in the input\n");
      break;
    case E2BIG:
      j_error("InternalError: codeconv: converted string size exceeded buffer (>%d)\n", maxoutlen);
      break;
    }
  }

  /* outstr always holds the result */
  return(outstr);
}

#endif /* HAVE_ICONV */
#endif /* CHARACTER_CONVERSION */

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