3956b1013e
We do not use iconv.alias file, so avoid using the vestiges of the code that do. Differential Revision: https://reviews.freebsd.org/D1729 Reviewed by: emaste MFC after: 2 weeks
360 lines
8.6 KiB
C
360 lines
8.6 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: citrus_iconv.c,v 1.10 2011/11/19 18:34:21 tnozaki Exp $ */
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/*-
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* Copyright (c)2003 Citrus Project,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <iconv.h>
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#include <langinfo.h>
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#include <limits.h>
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#include <paths.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "citrus_namespace.h"
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#include "citrus_bcs.h"
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#include "citrus_esdb.h"
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#include "citrus_region.h"
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#include "citrus_memstream.h"
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#include "citrus_mmap.h"
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#include "citrus_module.h"
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#include "citrus_lock.h"
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#include "citrus_lookup.h"
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#include "citrus_hash.h"
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#include "citrus_iconv.h"
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#define _CITRUS_ICONV_DIR "iconv.dir"
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#define _CITRUS_ICONV_ALIAS "iconv.alias"
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#define CI_HASH_SIZE 101
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#define CI_INITIAL_MAX_REUSE 5
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#define CI_ENV_MAX_REUSE "ICONV_MAX_REUSE"
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static bool isinit = false;
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static int shared_max_reuse, shared_num_unused;
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static _CITRUS_HASH_HEAD(, _citrus_iconv_shared, CI_HASH_SIZE) shared_pool;
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static TAILQ_HEAD(, _citrus_iconv_shared) shared_unused;
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static pthread_rwlock_t ci_lock = PTHREAD_RWLOCK_INITIALIZER;
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static __inline void
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init_cache(void)
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{
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WLOCK(&ci_lock);
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if (!isinit) {
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_CITRUS_HASH_INIT(&shared_pool, CI_HASH_SIZE);
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TAILQ_INIT(&shared_unused);
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shared_max_reuse = -1;
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if (!issetugid() && getenv(CI_ENV_MAX_REUSE))
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shared_max_reuse = atoi(getenv(CI_ENV_MAX_REUSE));
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if (shared_max_reuse < 0)
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shared_max_reuse = CI_INITIAL_MAX_REUSE;
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isinit = true;
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}
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UNLOCK(&ci_lock);
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}
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static __inline void
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close_shared(struct _citrus_iconv_shared *ci)
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{
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if (ci) {
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if (ci->ci_module) {
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if (ci->ci_ops) {
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if (ci->ci_closure)
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(*ci->ci_ops->io_uninit_shared)(ci);
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free(ci->ci_ops);
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}
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_citrus_unload_module(ci->ci_module);
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}
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free(ci);
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}
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}
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static __inline int
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open_shared(struct _citrus_iconv_shared * __restrict * __restrict rci,
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const char * __restrict convname, const char * __restrict src,
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const char * __restrict dst)
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{
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struct _citrus_iconv_shared *ci;
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_citrus_iconv_getops_t getops;
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const char *module;
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size_t len_convname;
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int ret;
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#ifdef INCOMPATIBLE_WITH_GNU_ICONV
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/*
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* Sadly, the gnu tools expect iconv to actually parse the
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* byte stream and don't allow for a pass-through when
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* the (src,dest) encodings are the same.
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* See gettext-0.18.3+ NEWS:
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* msgfmt now checks PO file headers more strictly with less
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* false-positives.
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* NetBSD don't do this either.
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*/
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module = (strcmp(src, dst) != 0) ? "iconv_std" : "iconv_none";
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#else
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module = "iconv_std";
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#endif
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/* initialize iconv handle */
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len_convname = strlen(convname);
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ci = malloc(sizeof(*ci) + len_convname + 1);
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if (!ci) {
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ret = errno;
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goto err;
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}
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ci->ci_module = NULL;
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ci->ci_ops = NULL;
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ci->ci_closure = NULL;
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ci->ci_convname = (void *)&ci[1];
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memcpy(ci->ci_convname, convname, len_convname + 1);
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/* load module */
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ret = _citrus_load_module(&ci->ci_module, module);
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if (ret)
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goto err;
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/* get operators */
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getops = (_citrus_iconv_getops_t)_citrus_find_getops(ci->ci_module,
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module, "iconv");
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if (!getops) {
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ret = EOPNOTSUPP;
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goto err;
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}
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ci->ci_ops = malloc(sizeof(*ci->ci_ops));
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if (!ci->ci_ops) {
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ret = errno;
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goto err;
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}
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ret = (*getops)(ci->ci_ops);
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if (ret)
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goto err;
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if (ci->ci_ops->io_init_shared == NULL ||
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ci->ci_ops->io_uninit_shared == NULL ||
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ci->ci_ops->io_init_context == NULL ||
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ci->ci_ops->io_uninit_context == NULL ||
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ci->ci_ops->io_convert == NULL) {
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ret = EINVAL;
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goto err;
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}
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/* initialize the converter */
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ret = (*ci->ci_ops->io_init_shared)(ci, src, dst);
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if (ret)
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goto err;
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*rci = ci;
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return (0);
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err:
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close_shared(ci);
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return (ret);
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}
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static __inline int
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hash_func(const char *key)
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{
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return (_string_hash_func(key, CI_HASH_SIZE));
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}
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static __inline int
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match_func(struct _citrus_iconv_shared * __restrict ci,
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const char * __restrict key)
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{
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return (strcmp(ci->ci_convname, key));
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}
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static int
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get_shared(struct _citrus_iconv_shared * __restrict * __restrict rci,
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const char *src, const char *dst)
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{
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struct _citrus_iconv_shared * ci;
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char convname[PATH_MAX];
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int hashval, ret = 0;
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snprintf(convname, sizeof(convname), "%s/%s", src, dst);
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WLOCK(&ci_lock);
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/* lookup alread existing entry */
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hashval = hash_func(convname);
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_CITRUS_HASH_SEARCH(&shared_pool, ci, ci_hash_entry, match_func,
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convname, hashval);
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if (ci != NULL) {
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/* found */
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if (ci->ci_used_count == 0) {
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TAILQ_REMOVE(&shared_unused, ci, ci_tailq_entry);
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shared_num_unused--;
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}
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ci->ci_used_count++;
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*rci = ci;
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goto quit;
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}
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/* create new entry */
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ret = open_shared(&ci, convname, src, dst);
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if (ret)
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goto quit;
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_CITRUS_HASH_INSERT(&shared_pool, ci, ci_hash_entry, hashval);
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ci->ci_used_count = 1;
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*rci = ci;
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quit:
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UNLOCK(&ci_lock);
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return (ret);
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}
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static void
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release_shared(struct _citrus_iconv_shared * __restrict ci)
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{
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WLOCK(&ci_lock);
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ci->ci_used_count--;
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if (ci->ci_used_count == 0) {
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/* put it into unused list */
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shared_num_unused++;
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TAILQ_INSERT_TAIL(&shared_unused, ci, ci_tailq_entry);
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/* flood out */
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while (shared_num_unused > shared_max_reuse) {
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ci = TAILQ_FIRST(&shared_unused);
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TAILQ_REMOVE(&shared_unused, ci, ci_tailq_entry);
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_CITRUS_HASH_REMOVE(ci, ci_hash_entry);
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shared_num_unused--;
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close_shared(ci);
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}
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}
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UNLOCK(&ci_lock);
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}
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/*
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* _citrus_iconv_open:
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* open a converter for the specified in/out codes.
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*/
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int
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_citrus_iconv_open(struct _citrus_iconv * __restrict * __restrict rcv,
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const char * __restrict src, const char * __restrict dst)
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{
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struct _citrus_iconv *cv = NULL;
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struct _citrus_iconv_shared *ci = NULL;
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char realdst[PATH_MAX], realsrc[PATH_MAX];
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#ifdef _PATH_ICONV
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char buf[PATH_MAX], path[PATH_MAX];
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#endif
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int ret;
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init_cache();
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/* GNU behaviour, using locale encoding if "" or "char" is specified */
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if ((strcmp(src, "") == 0) || (strcmp(src, "char") == 0))
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src = nl_langinfo(CODESET);
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if ((strcmp(dst, "") == 0) || (strcmp(dst, "char") == 0))
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dst = nl_langinfo(CODESET);
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/* resolve codeset name aliases */
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#ifdef _PATH_ICONV
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snprintf(path, sizeof(path), "%s/%s", _PATH_ICONV, _CITRUS_ICONV_ALIAS);
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strlcpy(realsrc, _lookup_alias(path, src, buf, (size_t)PATH_MAX,
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_LOOKUP_CASE_IGNORE), (size_t)PATH_MAX);
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strlcpy(realdst, _lookup_alias(path, dst, buf, (size_t)PATH_MAX,
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_LOOKUP_CASE_IGNORE), (size_t)PATH_MAX);
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#else
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strlcpy(realsrc, src, (size_t)PATH_MAX);
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strlcpy(realdst, dst, (size_t)PATH_MAX);
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#endif
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/* sanity check */
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if (strchr(realsrc, '/') != NULL || strchr(realdst, '/'))
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return (EINVAL);
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/* get shared record */
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ret = get_shared(&ci, realsrc, realdst);
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if (ret)
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return (ret);
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/* create/init context */
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if (*rcv == NULL) {
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cv = malloc(sizeof(*cv));
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if (cv == NULL) {
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ret = errno;
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release_shared(ci);
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return (ret);
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}
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*rcv = cv;
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}
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(*rcv)->cv_shared = ci;
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ret = (*ci->ci_ops->io_init_context)(*rcv);
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if (ret) {
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release_shared(ci);
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free(cv);
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return (ret);
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}
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return (0);
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}
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/*
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* _citrus_iconv_close:
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* close the specified converter.
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*/
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void
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_citrus_iconv_close(struct _citrus_iconv *cv)
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{
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if (cv) {
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(*cv->cv_shared->ci_ops->io_uninit_context)(cv);
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release_shared(cv->cv_shared);
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free(cv);
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}
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}
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const char
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*_citrus_iconv_canonicalize(const char *name)
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{
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char *buf;
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if ((buf = calloc((size_t)PATH_MAX, sizeof(*buf))) == NULL)
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return (NULL);
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_citrus_esdb_alias(name, buf, (size_t)PATH_MAX);
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return (buf);
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}
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