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+/* Copyright (C) 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef _GCONV_H
+#define _GCONV_H 1
+
+#include <features.h>
+#include <sys/types.h>
+#include <regex.h>
+
+/* Error codes for gconv functions. */
+enum
+{
+ GCONV_OK = 0,
+ GCONV_NOCONV,
+ GCONV_NODB,
+ GCONV_NOMEM,
+
+ GCONV_EMPTY_INPUT,
+ GCONV_FULL_OUTPUT,
+ GCONV_ILLEGAL_INPUT,
+
+ GCONV_ILLEGAL_DESCRIPTOR,
+ GCONV_INTERNAL_ERROR
+};
+
+
+/* Structure for alias definition. Simply to strings. */
+struct gconv_alias
+{
+ __const char *fromname;
+ __const char *toname;
+};
+
+
+/* Default size of intermediate buffers. */
+#define GCONV_DEFAULT_BUFSIZE 8160
+
+
+/* Forward declarations. */
+struct gconv_step;
+struct gconv_step_data;
+
+
+/* Type of a conversion function. */
+typedef int (*gconv_fct) __P ((struct gconv_step *,
+ struct gconv_step_data *,
+ __const char *, size_t *, size_t *, int));
+
+/* Constructor and destructor for local data for conversion step. */
+typedef int (*gconv_init_fct) __P ((struct gconv_step *,
+ struct gconv_step_data *));
+typedef void (*gconv_end_fct) __P ((struct gconv_step_data *));
+
+
+/* Description of a conversion step. */
+struct gconv_step
+{
+ void *shlib_handle;
+
+ __const char *from_name;
+ __const char *to_name;
+
+ gconv_fct fct;
+ gconv_init_fct init_fct;
+ gconv_end_fct end_fct;
+};
+
+/* Additional data for steps in use of conversion descriptor. This is
+ allocated by the `init' function. */
+struct gconv_step_data
+{
+ char *outbuf; /* Output buffer for this step. */
+ size_t outbufavail; /* Bytes already available in output buffer. */
+ size_t outbufsize; /* Size of output buffer. */
+
+ int is_last;
+
+ void *data; /* Pointer to step-local data. */
+};
+
+/* Combine conversion step description with data. */
+typedef struct gconv_info
+{
+ size_t nsteps;
+ struct gconv_step *steps;
+ struct gconv_step_data *data;
+} *gconv_t;
+
+
+/* Description for an available conversion module. */
+struct gconv_module
+{
+ __const char *from_pattern;
+ __const char *from_constpfx;
+ size_t from_constpfx_len;
+ __const regex_t *from_regex;
+
+ __const char *to_string;
+
+ int cost;
+
+ __const char *module_name;
+};
+
+
+/* Global variables. */
+
+/* Database of alias names. */
+extern void *__gconv_alias_db;
+
+/* Array with available modules. */
+extern size_t __gconv_nmodules;
+extern struct gconv_module **__gconv_modules_db;
+
+
+/* Return in *HANDLE decriptor for transformation from FROMSET to TOSET. */
+extern int __gconv_open __P ((__const char *__toset, __const char *__fromset,
+ gconv_t *__handle));
+
+/* Free resources associated with transformation descriptor CD. */
+extern int __gconv_close __P ((gconv_t cd));
+
+/* Transform at most *INBYTESLEFT bytes from buffer starting at *INBUF
+ according to rules described by CD and place up to *OUTBYTESLEFT
+ bytes in buffer starting at *OUTBUF. Return number of written
+ characters in *CONVERTED if this pointer is not null. */
+extern int __gconv __P ((gconv_t __cd,
+ __const char **__inbuf, size_t *__inbytesleft,
+ char **__outbuf, size_t *__outbytesleft,
+ size_t *__converted));
+
+/* Return in *HANDLE a pointer to an array with *NSTEPS elements describing
+ the single steps necessary for transformation from FROMSET to TOSET. */
+extern int __gconv_find_transform __P ((__const char *__toset,
+ __const char *__fromset,
+ struct gconv_step **__handle,
+ size_t *__nsteps));
+
+/* Read all the configuration data and cache it. */
+extern void __gconv_read_conf __P ((void));
+
+/* Comparison function to search alias. */
+extern int __gconv_alias_compare __P ((__const void *__p1,
+ __const void *__p2));
+
+/* Clear reference to transformation step implementations which might
+ cause the code to be unloaded. */
+extern int __gconv_close_transform __P ((struct gconv_step *__steps,
+ size_t __nsteps));
+
+
+/* Find in the shared object associated with HANDLE for a function with
+ name NAME. Return function pointer or NULL. */
+extern void *__gconv_find_func __P ((void *__handle, __const char *__name));
+
+/* Load shared object named by NAME. If already loaded increment reference
+ count. */
+extern void *__gconv_find_shlib __P ((__const char *__name));
+
+/* Release shared object. If no further reference is available unload
+ the object. */
+extern int __gconv_release_shlib __P ((void *__handle));
+
+/* Fill STEP with information about builtin module with NAME. */
+extern void __gconv_get_builtin_trans __P ((__const char *__name,
+ struct gconv_step *__step));
+
+
+
+/* Builtin transformations. */
+#ifdef _LIBC
+# define __BUILTIN_TRANS(Name) \
+ extern int Name __P ((struct gconv_step *__step, \
+ struct gconv_step_data *__data, __const char *__inbuf,\
+ size_t *__inlen, size_t *__written, int __do_flush))
+
+__BUILTIN_TRANS (__gconv_transform_dummy);
+__BUILTIN_TRANS (__gconv_transform_ucs4_utf8);
+__BUILTIN_TRANS (__gconv_transform_utf8_ucs4);
+# undef __BUITLIN_TRANS
+
+extern int __gconv_transform_init_rstate __P ((struct gconv_step *__step,
+ struct gconv_step_data *__data));
+extern void __gconv_transform_end_rstate __P ((struct gconv_step_data *__data));
+
+#endif
+
+#endif /* gconv.h */