minix/lib/nbsd_libc/citrus/citrus_iconv.c

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/* $NetBSD: citrus_iconv.c,v 1.8 2009/09/05 06:44:27 dholland Exp $ */
/*-
* Copyright (c)2003 Citrus Project,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: citrus_iconv.c,v 1.8 2009/09/05 06:44:27 dholland Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include "reentrant.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <unistd.h>
#include <paths.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/queue.h>
#include "citrus_namespace.h"
#include "citrus_bcs.h"
#include "citrus_region.h"
#include "citrus_memstream.h"
#include "citrus_mmap.h"
#include "citrus_module.h"
#include "citrus_lookup.h"
#include "citrus_hash.h"
#include "citrus_iconv.h"
#define _CITRUS_ICONV_DIR "iconv.dir"
#define _CITRUS_ICONV_ALIAS "iconv.alias"
#define CI_HASH_SIZE 101
#define CI_INITIAL_MAX_REUSE 5
#define CI_ENV_MAX_REUSE "ICONV_MAX_REUSE"
#ifdef _REENTRANT
static rwlock_t lock = RWLOCK_INITIALIZER;
#endif
static int isinit = 0;
static _CITRUS_HASH_HEAD(, _citrus_iconv_shared, CI_HASH_SIZE) shared_pool;
static TAILQ_HEAD(, _citrus_iconv_shared) shared_unused;
static int shared_num_unused, shared_max_reuse;
static __inline void
init_cache(void)
{
rwlock_wrlock(&lock);
if (!isinit) {
_CITRUS_HASH_INIT(&shared_pool, CI_HASH_SIZE);
TAILQ_INIT(&shared_unused);
shared_max_reuse = -1;
if (!issetugid() && getenv(CI_ENV_MAX_REUSE))
shared_max_reuse = atoi(getenv(CI_ENV_MAX_REUSE));
if (shared_max_reuse < 0)
shared_max_reuse = CI_INITIAL_MAX_REUSE;
isinit = 1;
}
rwlock_unlock(&lock);
}
/*
* lookup_iconv_entry:
* lookup iconv.dir entry in the specified directory.
*
* line format of iconv.dir file:
* key module arg
* key : lookup key.
* module : iconv module name.
* arg : argument for the module (generally, description file name)
*
*/
static __inline int
lookup_iconv_entry(const char *curdir, const char *key,
char *linebuf, size_t linebufsize,
const char **module, const char **variable)
{
const char *cp, *cq;
char *p, path[PATH_MAX];
/* iconv.dir path */
snprintf(path, (size_t)PATH_MAX, ("%s/" _CITRUS_ICONV_DIR), curdir);
/* lookup db */
cp = p = _lookup_simple(path, key, linebuf, linebufsize,
_LOOKUP_CASE_IGNORE);
if (p == NULL)
return ENOENT;
/* get module name */
*module = p;
cq = _bcs_skip_nonws(cp);
p[cq-cp] = '\0';
p += cq-cp+1;
cq++;
/* get variable */
cp = _bcs_skip_ws(cq);
*variable = p += cp - cq;
cq = _bcs_skip_nonws(cp);
p[cq-cp] = '\0';
return 0;
}
static __inline void
close_shared(struct _citrus_iconv_shared *ci)
{
if (ci) {
if (ci->ci_module) {
if (ci->ci_ops) {
if (ci->ci_closure)
(*ci->ci_ops->io_uninit_shared)(ci);
free(ci->ci_ops);
}
_citrus_unload_module(ci->ci_module);
}
free(ci);
}
}
static __inline int
open_shared(struct _citrus_iconv_shared * __restrict * __restrict rci,
const char * __restrict basedir, const char * __restrict convname,
const char * __restrict src, const char * __restrict dst)
{
int ret;
struct _citrus_iconv_shared *ci;
_citrus_iconv_getops_t getops;
char linebuf[LINE_MAX];
const char *module, *variable;
size_t len_convname;
/* search converter entry */
ret = lookup_iconv_entry(basedir, convname, linebuf, sizeof(linebuf),
&module, &variable);
if (ret) {
if (ret == ENOENT)
/* fallback */
ret = lookup_iconv_entry(basedir, "*",
linebuf, sizeof(linebuf),
&module, &variable);
if (ret)
return ret;
}
/* initialize iconv handle */
len_convname = strlen(convname);
ci = malloc(sizeof(*ci)+len_convname+1);
if (!ci) {
ret = errno;
goto err;
}
ci->ci_module = NULL;
ci->ci_ops = NULL;
ci->ci_closure = NULL;
ci->ci_convname = (void *)&ci[1];
memcpy(ci->ci_convname, convname, len_convname+1);
/* load module */
ret = _citrus_load_module(&ci->ci_module, module);
if (ret)
goto err;
/* get operators */
getops = (_citrus_iconv_getops_t)
_citrus_find_getops(ci->ci_module, module, "iconv");
if (!getops) {
ret = EOPNOTSUPP;
goto err;
}
ci->ci_ops = malloc(sizeof(*ci->ci_ops));
if (!ci->ci_ops) {
ret = errno;
goto err;
}
ret = (*getops)(ci->ci_ops, sizeof(*ci->ci_ops),
_CITRUS_ICONV_ABI_VERSION);
if (ret)
goto err;
/* version check */
if (ci->ci_ops->io_abi_version == 1) {
/* binary compatibility broken at ver.2 */
ret = EINVAL;
goto err;
}
if (ci->ci_ops->io_init_shared == NULL ||
ci->ci_ops->io_uninit_shared == NULL ||
ci->ci_ops->io_init_context == NULL ||
ci->ci_ops->io_uninit_context == NULL ||
ci->ci_ops->io_convert == NULL)
goto err;
/* initialize the converter */
ret = (*ci->ci_ops->io_init_shared)(ci, basedir, src, dst,
(const void *)variable,
strlen(variable)+1);
if (ret)
goto err;
*rci = ci;
return 0;
err:
close_shared(ci);
return ret;
}
static __inline int
hash_func(const char *key)
{
return _string_hash_func(key, CI_HASH_SIZE);
}
static __inline int
match_func(struct _citrus_iconv_shared * __restrict ci,
const char * __restrict key)
{
return strcmp(ci->ci_convname, key);
}
static int
get_shared(struct _citrus_iconv_shared * __restrict * __restrict rci,
const char *basedir, const char *src, const char *dst)
{
int ret = 0;
int hashval;
struct _citrus_iconv_shared * ci;
char convname[PATH_MAX];
snprintf(convname, sizeof(convname), "%s/%s", src, dst);
rwlock_wrlock(&lock);
/* lookup alread existing entry */
hashval = hash_func(convname);
_CITRUS_HASH_SEARCH(&shared_pool, ci, ci_hash_entry, match_func,
convname, hashval);
if (ci != NULL) {
/* found */
if (ci->ci_used_count == 0) {
TAILQ_REMOVE(&shared_unused, ci, ci_tailq_entry);
shared_num_unused--;
}
ci->ci_used_count++;
*rci = ci;
goto quit;
}
/* create new entry */
ret = open_shared(&ci, basedir, convname, src, dst);
if (ret)
goto quit;
_CITRUS_HASH_INSERT(&shared_pool, ci, ci_hash_entry, hashval);
ci->ci_used_count = 1;
*rci = ci;
quit:
rwlock_unlock(&lock);
return ret;
}
static void
release_shared(struct _citrus_iconv_shared * __restrict ci)
{
rwlock_wrlock(&lock);
ci->ci_used_count--;
if (ci->ci_used_count == 0) {
/* put it into unused list */
shared_num_unused++;
TAILQ_INSERT_TAIL(&shared_unused, ci, ci_tailq_entry);
/* flood out */
while (shared_num_unused > shared_max_reuse) {
ci = TAILQ_FIRST(&shared_unused);
_DIAGASSERT(ci != NULL);
TAILQ_REMOVE(&shared_unused, ci, ci_tailq_entry);
_CITRUS_HASH_REMOVE(ci, ci_hash_entry);
shared_num_unused--;
close_shared(ci);
}
}
rwlock_unlock(&lock);
}
/*
* _citrus_iconv_open:
* open a converter for the specified in/out codes.
*/
int
_citrus_iconv_open(struct _citrus_iconv * __restrict * __restrict rcv,
const char * __restrict basedir,
const char * __restrict src, const char * __restrict dst)
{
int ret;
struct _citrus_iconv_shared *ci = NULL;
struct _citrus_iconv *cv;
char realsrc[PATH_MAX], realdst[PATH_MAX];
char buf[PATH_MAX], path[PATH_MAX];
init_cache();
/* resolve codeset name aliases */
snprintf(path, sizeof(path), "%s/%s", basedir, _CITRUS_ICONV_ALIAS);
strlcpy(realsrc,
_lookup_alias(path, src, buf, (size_t)PATH_MAX,
_LOOKUP_CASE_IGNORE),
(size_t)PATH_MAX);
strlcpy(realdst,
_lookup_alias(path, dst, buf, (size_t)PATH_MAX,
_LOOKUP_CASE_IGNORE),
(size_t)PATH_MAX);
/* sanity check */
if (strchr(realsrc, '/') != NULL || strchr(realdst, '/'))
return EINVAL;
/* get shared record */
ret = get_shared(&ci, basedir, realsrc, realdst);
if (ret)
return ret;
/* create/init context */
cv = malloc(sizeof(*cv));
if (cv == NULL) {
ret = errno;
release_shared(ci);
return ret;
}
cv->cv_shared = ci;
ret = (*ci->ci_ops->io_init_context)(cv);
if (ret) {
release_shared(ci);
free(cv);
return ret;
}
*rcv = cv;
return 0;
}
/*
* _citrus_iconv_close:
* close the specified converter.
*/
void
_citrus_iconv_close(struct _citrus_iconv *cv)
{
if (cv) {
(*cv->cv_shared->ci_ops->io_uninit_context)(cv);
release_shared(cv->cv_shared);
free(cv);
}
}