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From: Noriyuki Soda <soda@sra.co.jp>
> >> If the entries are not so many, perhaps in-core processing is
> >> more efficient at both speed and memory usage...
> 
> > "in-core processing" means runtime-parsing of plain text?
> 
> Yes.

I made both version, plain text and berkley db.
(plain text version will be attached to this mail.)
but I'm not sure that how it can be compared. (speed, etc)
do you have any suggestion?

and there is another alternative. we can store the name of nls
category name into system-LC_MESSAGES database (we don't have it
yet, though).
how do you think about it?

---
YAMAMOTO Takashi<yamt@mwd.biglobe.ne.jp>

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/* $NetBSD$ */

/*-
 * Copyright (c)2002 YAMAMOTO Takashi,
 * 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("$NetBSD$");
#endif /* LIBC_SCCS and not lint */

#include <assert.h>
#include <stdio.h>
#include <string.h>

#include "aliasname_local.h"

__inline int __is_ws(char);

__inline int __is_ws(char ch)
{

	return (ch == ' ' || ch == '\t');
}

const char *
__unaliasname(const char *dbname, const char *alias, void *buf, size_t bufsize)
{
	FILE *fp = NULL;
	const char *result = alias;
	size_t resultlen;
	size_t aliaslen;
	const char *p;
	size_t len;

	_DIAGASSERT(dbname != NULL);
	_DIAGASSERT(alias != NULL);
	_DIAGASSERT(buf != NULL);

	fp = fopen(dbname, "r");
	if (fp == NULL)
		goto quit;

	aliaslen = strlen(alias);

	while (/*CONSTCOND*/ 1) {
		p = fgetln(fp, &len);
		if (p == NULL)
			goto quit; /* eof or error */

		_DIAGASSERT(len != 0);

		/* ignore terminating NL */
		if (p[len - 1] == '\n')
			len--;

		/* ignore null line and comment */
		if (len == 0 || p[0] == '#')
			continue;

		if (aliaslen > len)
			continue;

		if (memcmp(alias, p, aliaslen))
			continue;

		p += aliaslen;
		len -= aliaslen;

		if (len == 0 || !__is_ws(*p))
			continue;

		/* entry was found here */
		break;

		/* NOTREACHED */
	}

	/* skip white spaces */
	do {
		p++;
		len--;
	} while (len != 0 && __is_ws(*p));

	if (len == 0)
		goto quit;

	/* count length of result */
	resultlen = 0;
	while (resultlen < len && !__is_ws(*p))
		resultlen++;

	/* check if space is enough */
	if (bufsize < resultlen + 1)
		goto quit;

	memcpy(buf, p, resultlen);
	((char *)buf)[resultlen] = 0;
	result = buf;

quit:
	if (fp)
		fclose(fp);

	return result;
}

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