minix/lib/libc/citrus/citrus_iconv.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

387 lines
9.3 KiB
C

/* $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);
}
}