pgsql/include/iconv.h

/* Copyright (C) 1999-2022 Free Software Foundation, Inc.
   This file is part of the GNU LIBICONV Library.

   The GNU LIBICONV Library is free software; you can redistribute it
   and/or modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either version 2.1
   of the License, or (at your option) any later version.

   The GNU LIBICONV Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU LIBICONV Library; see the file COPYING.LIB.
   If not, see <https://www.gnu.org/licenses/>.  */

/* When installed, this file is called "iconv.h". */

#ifndef _LIBICONV_H
#define _LIBICONV_H

#define _LIBICONV_VERSION 0x0111    /* version number: (major<<8) + minor */
extern __declspec (dllimport) int _libiconv_version; /* Likewise */

/* We would like to #include any system header file which could define
   iconv_t, 1. in order to eliminate the risk that the user gets compilation
   errors because some other system header file includes /usr/include/iconv.h
   which defines iconv_t or declares iconv after this file, 2. when compiling
   for LIBICONV_PLUG, we need the proper iconv_t type in order to produce
   binary compatible code.
   But gcc's #include_next is not portable. Thus, once libiconv's iconv.h
   has been installed in /usr/local/include, there is no way any more to
   include the original /usr/include/iconv.h. We simply have to get away
   without it.
   Ad 1. The risk that a system header file does
   #include "iconv.h"  or  #include_next "iconv.h"
   is small. They all do #include <iconv.h>.
   Ad 2. The iconv_t type is a pointer type in all cases I have seen. (It
   has to be a scalar type because (iconv_t)(-1) is a possible return value
   from iconv_open().) */

/* Define iconv_t ourselves. */
#undef iconv_t
#define iconv_t libiconv_t
typedef void* iconv_t;

/* Get size_t declaration.
   Get wchar_t declaration if it exists. */
#include <stddef.h>

/* Get errno declaration and values. */
#include <errno.h>
/* Some systems, like SunOS 4, don't have EILSEQ. Some systems, like BSD/OS,
   have EILSEQ in a different header.  On these systems, define EILSEQ
   ourselves. */
#ifndef EILSEQ
#define EILSEQ 
#endif


#ifdef __cplusplus
extern "C" {
#endif


/* Allocates descriptor for code conversion from encoding ‘fromcode’ to
   encoding ‘tocode’. */
#ifndef LIBICONV_PLUG
#define iconv_open libiconv_open
#endif
extern iconv_t iconv_open (const char* tocode, const char* fromcode);

/* Converts, using conversion descriptor ‘cd’, at most ‘*inbytesleft’ bytes
   starting at ‘*inbuf’, writing at most ‘*outbytesleft’ bytes starting at
   ‘*outbuf’.
   Decrements ‘*inbytesleft’ and increments ‘*inbuf’ by the same amount.
   Decrements ‘*outbytesleft’ and increments ‘*outbuf’ by the same amount. */
#ifndef LIBICONV_PLUG
#define iconv libiconv
#endif
extern size_t iconv (iconv_t cd,  char* * inbuf, size_t *inbytesleft, char* * outbuf, size_t *outbytesleft);

/* Frees resources allocated for conversion descriptor ‘cd’. */
#ifndef LIBICONV_PLUG
#define iconv_close libiconv_close
#endif
extern int iconv_close (iconv_t cd);


#ifdef __cplusplus
}
#endif


#ifndef LIBICONV_PLUG

/* Nonstandard extensions. */

#if 1
#if 0
/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
   <wchar.h>.
   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
   included before <wchar.h>.  */
#include <stddef.h>
#include <stdio.h>
#include <time.h>
#endif
#include <wchar.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

/* A type that holds all memory needed by a conversion descriptor.
   A pointer to such an object can be used as an iconv_t. */
typedef struct {
  void* dummy1[28];
#if 1
  mbstate_t dummy2;
#endif
} iconv_allocation_t;

/* Allocates descriptor for code conversion from encoding ‘fromcode’ to
   encoding ‘tocode’ into preallocated memory. Returns an error indicator
   (0 or -1 with errno set). */
#define iconv_open_into libiconv_open_into
extern int iconv_open_into (const char* tocode, const char* fromcode,
                            iconv_allocation_t* resultp);

/* Control of attributes. */
#define iconvctl libiconvctl
extern int iconvctl (iconv_t cd, int request, void* argument);

/* Hook performed after every successful conversion of a Unicode character. */
typedef void (*iconv_unicode_char_hook) (unsigned int uc, void* data);
/* Hook performed after every successful conversion of a wide character. */
typedef void (*iconv_wide_char_hook) (wchar_t wc, void* data);
/* Set of hooks. */
struct iconv_hooks {
  iconv_unicode_char_hook uc_hook;
  iconv_wide_char_hook wc_hook;
  void* data;
};

/* Fallback function.  Invoked when a small number of bytes could not be
   converted to a Unicode character.  This function should process all
   bytes from inbuf and may produce replacement Unicode characters by calling
   the write_replacement callback repeatedly.  */
typedef void (*iconv_unicode_mb_to_uc_fallback)
             (const char* inbuf, size_t inbufsize,
              void (*write_replacement) (const unsigned int *buf, size_t buflen,
                                         void* callback_arg),
              void* callback_arg,
              void* data);
/* Fallback function.  Invoked when a Unicode character could not be converted
   to the target encoding.  This function should process the character and
   may produce replacement bytes (in the target encoding) by calling the
   write_replacement callback repeatedly.  */
typedef void (*iconv_unicode_uc_to_mb_fallback)
             (unsigned int code,
              void (*write_replacement) (const char *buf, size_t buflen,
                                         void* callback_arg),
              void* callback_arg,
              void* data);
#if 1
/* Fallback function.  Invoked when a number of bytes could not be converted to
   a wide character.  This function should process all bytes from inbuf and may
   produce replacement wide characters by calling the write_replacement
   callback repeatedly.  */
typedef void (*iconv_wchar_mb_to_wc_fallback)
             (const char* inbuf, size_t inbufsize,
              void (*write_replacement) (const wchar_t *buf, size_t buflen,
                                         void* callback_arg),
              void* callback_arg,
              void* data);
/* Fallback function.  Invoked when a wide character could not be converted to
   the target encoding.  This function should process the character and may
   produce replacement bytes (in the target encoding) by calling the
   write_replacement callback repeatedly.  */
typedef void (*iconv_wchar_wc_to_mb_fallback)
             (wchar_t code,
              void (*write_replacement) (const char *buf, size_t buflen,
                                         void* callback_arg),
              void* callback_arg,
              void* data);
#else
/* If the wchar_t type does not exist, these two fallback functions are never
   invoked.  Their argument list therefore does not matter.  */
typedef void (*iconv_wchar_mb_to_wc_fallback) ();
typedef void (*iconv_wchar_wc_to_mb_fallback) ();
#endif
/* Set of fallbacks. */
struct iconv_fallbacks {
  iconv_unicode_mb_to_uc_fallback mb_to_uc_fallback;
  iconv_unicode_uc_to_mb_fallback uc_to_mb_fallback;
  iconv_wchar_mb_to_wc_fallback mb_to_wc_fallback;
  iconv_wchar_wc_to_mb_fallback wc_to_mb_fallback;
  void* data;
};

/* Requests for iconvctl. */
#define ICONV_TRIVIALP            0  /* int *argument */
#define ICONV_GET_TRANSLITERATE   1  /* int *argument */
#define ICONV_SET_TRANSLITERATE   2  /* const int *argument */
#define ICONV_GET_DISCARD_ILSEQ   3  /* int *argument */
#define ICONV_SET_DISCARD_ILSEQ   4  /* const int *argument */
#define ICONV_SET_HOOKS           5  /* const struct iconv_hooks *argument */
#define ICONV_SET_FALLBACKS       6  /* const struct iconv_fallbacks *argument */

/* Listing of locale independent encodings. */
#define iconvlist libiconvlist
extern void iconvlist (int (*do_one) (unsigned int namescount,
                                      const char * const * names,
                                      void* data),
                       void* data);

/* Canonicalize an encoding name.
   The result is either a canonical encoding name, or name itself. */
extern const char * iconv_canonicalize (const char * name);

/* Support for relocatable packages.  */

/* Sets the original and the current installation prefix of the package.
   Relocation simply replaces a pathname starting with the original prefix
   by the corresponding pathname with the current prefix instead.  Both
   prefixes should be directory names without trailing slash (i.e. use ""
   instead of "/").  */
extern void libiconv_set_relocation_prefix (const char *orig_prefix,
                                            const char *curr_prefix);

#ifdef __cplusplus
}
#endif

#endif


#endif /* _LIBICONV_H */