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/* $NetBSD: gettext_iconv.c,v 1.8 2009/02/18 13:08:22 yamt Exp $ */
/*-
* Copyright (c) 2004 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.
*
* $Citrus$
*/
#include <sys/types.h>
#include <sys/param.h>
#include <errno.h>
#include <iconv.h>
#include <libintl.h>
#include <langinfo.h>
#include <search.h>
#include <stdlib.h>
#include <string.h>
#include "libintl_local.h"
struct cache {
const char *c_origmsg;
const char *c_resultmsg;
};
static const struct cache *cache_find(const char *, struct domainbinding *);
static int cache_enter(const char *, const char *);
static int cache_cmp(const void *, const void *);
static void *cacheroot;
/* ARGSUSED1 */
static const struct cache *
cache_find(const char *msg, struct domainbinding *db)
{
struct cache key;
struct cache **c;
key.c_origmsg = msg;
c = tfind(&key, &cacheroot, cache_cmp);
return c ? *c : NULL;
}
static int
cache_enter(const char *origmsg, const char *resultmsg)
{
struct cache *c;
c = malloc(sizeof(*c));
if (c == NULL)
return -1;
c->c_origmsg = origmsg;
c->c_resultmsg = resultmsg;
if (tsearch(c, &cacheroot, cache_cmp) == NULL) {
free(c);
return -1;
}
return 0;
}
static int
cache_cmp(const void *va, const void *vb)
{
const struct cache *a = va;
const struct cache *b = vb;
int result;
if (a->c_origmsg > b->c_origmsg) {
result = 1;
} else if (a->c_origmsg < b->c_origmsg) {
result = -1;
} else {
result = 0;
}
return result;
}
#define GETTEXT_ICONV_MALLOC_CHUNK (16 * 1024)
const char *
__gettext_iconv(const char *origmsg, struct domainbinding *db)
{
const char *tocode;
const char *fromcode = db->mohandle.mo.mo_charset;
const struct cache *cache;
const char *result;
iconv_t cd;
const char *src;
char *dst;
size_t origlen;
size_t srclen;
size_t dstlen;
size_t nvalid;
int savederrno = errno;
/*
* static buffer for converted texts.
*
* note:
* we never free buffers once returned to callers.
* because of interface design of gettext, we can't know
* the lifetime of them.
*/
static char *buffer;
static size_t bufferlen;
/*
* don't convert message if *.mo doesn't specify codeset.
*/
if (fromcode == NULL)
return origmsg;
tocode = db->codeset;
if (tocode == NULL) {
/*
* codeset isn't specified explicitly by
* bind_textdomain_codeset().
* use current locale(LC_CTYPE)'s codeset.
*
* XXX maybe wrong; it can mismatch with
* environment variable setting.
*/
tocode = nl_langinfo(CODESET);
}
/*
* shortcut if possible.
* XXX should handle aliases
*/
if (!strcasecmp(tocode, fromcode))
return origmsg;
/* XXX LOCK */
/* XXX should detect change of tocode and purge caches? */
/*
* see if we have already converted this message.
*/
cache = cache_find(origmsg, db);
if (cache) {
result = cache->c_resultmsg;
goto out;
}
origlen = strlen(origmsg) + 1;
again:
cd = iconv_open(tocode, fromcode);
if (cd == (iconv_t)-1) {
result = origmsg;
goto out;
}
src = origmsg;
srclen = origlen;
dst = buffer;
dstlen = bufferlen;
nvalid = iconv(cd, &src, &srclen, &dst, &dstlen);
iconv_close(cd);
if (nvalid == (size_t)-1) {
/*
* try to allocate a new buffer.
*
* just give up if GETTEXT_ICONV_MALLOC_CHUNK was not enough.
*/
if (errno == E2BIG &&
bufferlen != GETTEXT_ICONV_MALLOC_CHUNK) {
buffer = malloc(GETTEXT_ICONV_MALLOC_CHUNK);
if (buffer) {
bufferlen = GETTEXT_ICONV_MALLOC_CHUNK;
goto again;
}
}
result = origmsg;
} else if (cache_enter(origmsg, buffer)) {
/*
* failed to enter cache. give up.
*/
result = origmsg;
} else {
size_t resultlen = dst - buffer;
result = buffer;
bufferlen -= resultlen;
buffer += resultlen;
}
out:
/* XXX UNLOCK */
errno = savederrno;
return result;
}
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