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File: [cvs.NetBSD.org] / src / lib / libintl / gettext_iconv.c (download)

Revision 1.8, Wed Feb 18 13:08:22 2009 UTC (10 years, 7 months ago) by yamt
Branch: MAIN
CVS Tags: yamt-pagecache-tag8, yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, yamt-pagecache, tls-maxphys-base, tls-maxphys, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20190609, phil-wifi, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9, netbsd-8-base, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, matt-premerge-20091211, matt-nb8-mediatek-base, matt-nb8-mediatek, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, matt-mips64-premerge-20101231, localcount-20160914, jym-xensuspend-nbase, jym-xensuspend-base, cherry-xenmp-base, cherry-xenmp, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, bouyer-quota2-nbase, bouyer-quota2-base, bouyer-quota2, agc-symver-base, agc-symver, HEAD
Changes since 1.7: +8 -2 lines

cache_cmp: fix comparison.

/*	$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;
}