d915a14ef0
Mainly focus on files that use BSD 2-Clause license, however the tool I was using mis-identified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
408 lines
8.3 KiB
C
408 lines
8.3 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: citrus_mapper.c,v 1.10 2012/06/08 07:49:42 martin Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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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/stat.h>
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#include <sys/queue.h>
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#include <assert.h>
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#include <errno.h>
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#include <limits.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 "citrus_namespace.h"
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#include "citrus_types.h"
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#include "citrus_region.h"
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#include "citrus_lock.h"
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#include "citrus_memstream.h"
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#include "citrus_bcs.h"
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#include "citrus_mmap.h"
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#include "citrus_module.h"
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#include "citrus_hash.h"
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#include "citrus_mapper.h"
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#define _CITRUS_MAPPER_DIR "mapper.dir"
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#define CM_HASH_SIZE 101
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#define REFCOUNT_PERSISTENT -1
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static pthread_rwlock_t cm_lock = PTHREAD_RWLOCK_INITIALIZER;
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struct _citrus_mapper_area {
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_CITRUS_HASH_HEAD(, _citrus_mapper, CM_HASH_SIZE) ma_cache;
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char *ma_dir;
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};
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/*
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* _citrus_mapper_create_area:
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* create mapper area
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*/
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int
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_citrus_mapper_create_area(
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struct _citrus_mapper_area *__restrict *__restrict rma,
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const char *__restrict area)
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{
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struct _citrus_mapper_area *ma;
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struct stat st;
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char path[PATH_MAX];
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int ret;
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WLOCK(&cm_lock);
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if (*rma != NULL) {
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ret = 0;
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goto quit;
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}
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snprintf(path, (size_t)PATH_MAX, "%s/%s", area, _CITRUS_MAPPER_DIR);
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ret = stat(path, &st);
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if (ret)
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goto quit;
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ma = malloc(sizeof(*ma));
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if (ma == NULL) {
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ret = errno;
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goto quit;
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}
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ma->ma_dir = strdup(area);
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if (ma->ma_dir == NULL) {
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ret = errno;
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free(ma);
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goto quit;
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}
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_CITRUS_HASH_INIT(&ma->ma_cache, CM_HASH_SIZE);
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*rma = ma;
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ret = 0;
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quit:
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UNLOCK(&cm_lock);
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return (ret);
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}
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/*
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* lookup_mapper_entry:
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* lookup mapper.dir entry in the specified directory.
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*
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* line format of iconv.dir file:
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* mapper module arg
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* mapper : mapper name.
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* module : mapper module name.
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* arg : argument for the module (generally, description file name)
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*/
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static int
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lookup_mapper_entry(const char *dir, const char *mapname, void *linebuf,
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size_t linebufsize, const char **module, const char **variable)
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{
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struct _region r;
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struct _memstream ms;
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const char *cp, *cq;
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char *p;
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char path[PATH_MAX];
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size_t len;
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int ret;
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/* create mapper.dir path */
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snprintf(path, (size_t)PATH_MAX, "%s/%s", dir, _CITRUS_MAPPER_DIR);
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/* open read stream */
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ret = _map_file(&r, path);
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if (ret)
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return (ret);
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_memstream_bind(&ms, &r);
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/* search the line matching to the map name */
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cp = _memstream_matchline(&ms, mapname, &len, 0);
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if (!cp) {
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ret = ENOENT;
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goto quit;
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}
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if (!len || len > linebufsize - 1) {
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ret = EINVAL;
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goto quit;
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}
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p = linebuf;
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/* get module name */
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*module = p;
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cq = _bcs_skip_nonws_len(cp, &len);
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strlcpy(p, cp, (size_t)(cq - cp + 1));
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p += cq - cp + 1;
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/* get variable */
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*variable = p;
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cp = _bcs_skip_ws_len(cq, &len);
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strlcpy(p, cp, len + 1);
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ret = 0;
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quit:
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_unmap_file(&r);
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return (ret);
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}
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/*
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* mapper_close:
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* simply close a mapper. (without handling hash)
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*/
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static void
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mapper_close(struct _citrus_mapper *cm)
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{
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if (cm->cm_module) {
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if (cm->cm_ops) {
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if (cm->cm_closure)
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(*cm->cm_ops->mo_uninit)(cm);
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free(cm->cm_ops);
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}
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_citrus_unload_module(cm->cm_module);
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}
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free(cm->cm_traits);
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free(cm);
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}
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/*
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* mapper_open:
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* simply open a mapper. (without handling hash)
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*/
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static int
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mapper_open(struct _citrus_mapper_area *__restrict ma,
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struct _citrus_mapper * __restrict * __restrict rcm,
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const char * __restrict module,
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const char * __restrict variable)
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{
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struct _citrus_mapper *cm;
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_citrus_mapper_getops_t getops;
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int ret;
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/* initialize mapper handle */
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cm = malloc(sizeof(*cm));
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if (!cm)
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return (errno);
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cm->cm_module = NULL;
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cm->cm_ops = NULL;
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cm->cm_closure = NULL;
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cm->cm_traits = NULL;
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cm->cm_refcount = 0;
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cm->cm_key = NULL;
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/* load module */
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ret = _citrus_load_module(&cm->cm_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_mapper_getops_t)
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_citrus_find_getops(cm->cm_module, module, "mapper");
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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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cm->cm_ops = malloc(sizeof(*cm->cm_ops));
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if (!cm->cm_ops) {
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ret = errno;
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goto err;
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}
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ret = (*getops)(cm->cm_ops);
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if (ret)
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goto err;
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if (!cm->cm_ops->mo_init ||
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!cm->cm_ops->mo_uninit ||
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!cm->cm_ops->mo_convert ||
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!cm->cm_ops->mo_init_state) {
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ret = EINVAL;
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goto err;
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}
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/* allocate traits structure */
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cm->cm_traits = malloc(sizeof(*cm->cm_traits));
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if (cm->cm_traits == NULL) {
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ret = errno;
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goto err;
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}
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/* initialize the mapper */
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ret = (*cm->cm_ops->mo_init)(ma, cm, ma->ma_dir,
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(const void *)variable, strlen(variable) + 1,
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cm->cm_traits, sizeof(*cm->cm_traits));
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if (ret)
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goto err;
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*rcm = cm;
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return (0);
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err:
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mapper_close(cm);
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return (ret);
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}
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/*
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* _citrus_mapper_open_direct:
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* open a mapper.
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*/
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int
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_citrus_mapper_open_direct(struct _citrus_mapper_area *__restrict ma,
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struct _citrus_mapper * __restrict * __restrict rcm,
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const char * __restrict module, const char * __restrict variable)
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{
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return (mapper_open(ma, rcm, module, variable));
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}
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/*
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* hash_func
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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, CM_HASH_SIZE));
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}
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/*
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* match_func
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*/
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static __inline int
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match_func(struct _citrus_mapper *cm, const char *key)
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{
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return (strcmp(cm->cm_key, key));
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}
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/*
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* _citrus_mapper_open:
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* open a mapper with looking up "mapper.dir".
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*/
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int
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_citrus_mapper_open(struct _citrus_mapper_area *__restrict ma,
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struct _citrus_mapper * __restrict * __restrict rcm,
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const char * __restrict mapname)
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{
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struct _citrus_mapper *cm;
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char linebuf[PATH_MAX];
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const char *module, *variable;
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int hashval, ret;
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variable = NULL;
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WLOCK(&cm_lock);
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/* search in the cache */
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hashval = hash_func(mapname);
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_CITRUS_HASH_SEARCH(&ma->ma_cache, cm, cm_entry, match_func, mapname,
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hashval);
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if (cm) {
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/* found */
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cm->cm_refcount++;
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*rcm = cm;
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ret = 0;
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goto quit;
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}
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/* search mapper entry */
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ret = lookup_mapper_entry(ma->ma_dir, mapname, linebuf,
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(size_t)PATH_MAX, &module, &variable);
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if (ret)
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goto quit;
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/* open mapper */
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UNLOCK(&cm_lock);
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ret = mapper_open(ma, &cm, module, variable);
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WLOCK(&cm_lock);
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if (ret)
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goto quit;
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cm->cm_key = strdup(mapname);
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if (cm->cm_key == NULL) {
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ret = errno;
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_mapper_close(cm);
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goto quit;
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}
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/* insert to the cache */
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cm->cm_refcount = 1;
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_CITRUS_HASH_INSERT(&ma->ma_cache, cm, cm_entry, hashval);
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*rcm = cm;
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ret = 0;
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quit:
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UNLOCK(&cm_lock);
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return (ret);
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}
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/*
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* _citrus_mapper_close:
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* close the specified mapper.
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*/
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void
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_citrus_mapper_close(struct _citrus_mapper *cm)
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{
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if (cm) {
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WLOCK(&cm_lock);
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if (cm->cm_refcount == REFCOUNT_PERSISTENT)
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goto quit;
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if (cm->cm_refcount > 0) {
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if (--cm->cm_refcount > 0)
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goto quit;
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_CITRUS_HASH_REMOVE(cm, cm_entry);
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free(cm->cm_key);
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}
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UNLOCK(&cm_lock);
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mapper_close(cm);
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return;
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quit:
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UNLOCK(&cm_lock);
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}
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}
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/*
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* _citrus_mapper_set_persistent:
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* set persistent count.
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*/
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void
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_citrus_mapper_set_persistent(struct _citrus_mapper * __restrict cm)
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{
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WLOCK(&cm_lock);
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cm->cm_refcount = REFCOUNT_PERSISTENT;
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UNLOCK(&cm_lock);
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}
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