/* Character set conversion with error handling.
   Copyright (C) 2001-2007 Free Software Foundation, Inc.
   Written by Bruno Haible and Simon Josefsson.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifndef _STRICONVEH_H
#define _STRICONVEH_H

#include <stddef.h>
#if HAVE_ICONV
#include <iconv.h>
#endif


#ifdef __cplusplus
extern "C" {
#endif


/* Handling of unconvertible characters.  */
enum iconv_ilseq_handler
{
  iconveh_error,		/* return and set errno = EILSEQ */
  iconveh_question_mark,	/* use one '?' per unconvertible character */
  iconveh_escape_sequence	/* use escape sequence \uxxxx or \Uxxxxxxxx */
};

#if HAVE_ICONV

/* Convert an entire string from one encoding to another, using iconv.
   The original string is at [SRC,...,SRC+SRCLEN-1].
   The conversion descriptor from FROMCODE to TOCODE is passed as CD.
   CD1 is the conversion descriptor from FROM_CODESET to UTF-8 (or
   (iconv_t)(-1) if FROM_CODESET is UTF-8).
   CD2 is the conversion descriptor from UTF-8 to TO_CODESET (or (iconv_t)(-1)
   if TO_CODESET is UTF-8).
   If OFFSETS is not NULL, it should point to an array of SRCLEN integers; this
   array is filled with offsets into the result, i.e. the character starting
   at SRC[i] corresponds to the character starting at (*RESULTP)[OFFSETS[i]],
   and other offsets are set to (size_t)(-1).
   *RESULTP and *LENGTH should initially be a scratch buffer and its size,
   or *RESULTP can initially be NULL.
   May erase the contents of the memory at *RESULTP.
   Return value: 0 if successful, otherwise -1 and errno set.
   If successful: The resulting string is stored in *RESULTP and its length
   in *LENGTHP.  *RESULTP is set to a freshly allocated memory block, or is
   unchanged if no dynamic memory allocation was necessary.  */
extern int
       mem_cd_iconveh (const char *src, size_t srclen,
		       iconv_t cd, iconv_t cd1, iconv_t cd2,
		       enum iconv_ilseq_handler handler,
		       size_t *offsets,
		       char **resultp, size_t *lengthp);

/* Convert an entire string from one encoding to another, using iconv.
   The original string is the NUL-terminated string starting at SRC.
   The conversion descriptor is passed as CD.  Both the "from" and the "to"
   encoding must use a single NUL byte at the end of the string (i.e. not
   UCS-2, UCS-4, UTF-16, UTF-32).
   CD1 is the conversion descriptor from FROM_CODESET to UTF-8 (or
   (iconv_t)(-1) if FROM_CODESET is UTF-8).
   CD2 is the conversion descriptor from UTF-8 to TO_CODESET (or (iconv_t)(-1)
   if TO_CODESET is UTF-8).
   Allocate a malloced memory block for the result.
   Return value: the freshly allocated resulting NUL-terminated string if
   successful, otherwise NULL and errno set.  */
extern char *
       str_cd_iconveh (const char *src,
		       iconv_t cd, iconv_t cd1, iconv_t cd2,
		       enum iconv_ilseq_handler handler);

#endif

/* Convert an entire string from one encoding to another, using iconv.
   The original string is at [SRC,...,SRC+SRCLEN-1].
   If OFFSETS is not NULL, it should point to an array of SRCLEN integers; this
   array is filled with offsets into the result, i.e. the character starting
   at SRC[i] corresponds to the character starting at (*RESULTP)[OFFSETS[i]],
   and other offsets are set to (size_t)(-1).
   *RESULTP and *LENGTH should initially be a scratch buffer and its size,
   or *RESULTP can initially be NULL.
   May erase the contents of the memory at *RESULTP.
   Return value: 0 if successful, otherwise -1 and errno set.
   If successful: The resulting string is stored in *RESULTP and its length
   in *LENGTHP.  *RESULTP is set to a freshly allocated memory block, or is
   unchanged if no dynamic memory allocation was necessary.  */
extern int
       mem_iconveh (const char *src, size_t srclen,
		    const char *from_codeset, const char *to_codeset,
		    enum iconv_ilseq_handler handler,
		    size_t *offsets,
		    char **resultp, size_t *lengthp);

/* Convert an entire string from one encoding to another, using iconv.
   The original string is the NUL-terminated string starting at SRC.
   Both the "from" and the "to" encoding must use a single NUL byte at the
   end of the string (i.e. not UCS-2, UCS-4, UTF-16, UTF-32).
   Allocate a malloced memory block for the result.
   Return value: the freshly allocated resulting NUL-terminated string if
   successful, otherwise NULL and errno set.  */
extern char *
       str_iconveh (const char *src,
		    const char *from_codeset, const char *to_codeset,
		    enum iconv_ilseq_handler handler);


#ifdef __cplusplus
}
#endif


#endif /* _STRICONVEH_H */