File: strlcpy.c

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/* -*-pgsql-c-*- */
/*
 *
 * $Header$
 *
 * This file was imported from PostgreSQL source code.
 * See below for the copyright and description.
 *
 * pgpool: a language independent connection pool server for PostgreSQL
 * written by Tatsuo Ishii
 *
 * Portions Copyright (c) 2003-2008	PgPool Global Development Group
 *
 */
/*-------------------------------------------------------------------------
 *
 * strlcpy.c
 *	  strncpy done right
 *
 * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
 *
 *
 * IDENTIFICATION
 *	  $PostgreSQL: pgsql/src/port/strlcpy.c,v 1.3 2006/10/04 00:30:14 momjian Exp $
 *
 * This file was taken from OpenBSD and is used on platforms that don't
 * provide strlcpy().  The OpenBSD copyright terms follow.
 *-------------------------------------------------------------------------
 */

/*	$OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $	*/

/*
 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <unistd.h>
#include "pool.h"

/*
 * Copy src to string dst of size siz.	At most siz-1 characters
 * will be copied.	Always NUL terminates (unless siz == 0).
 * Returns strlen(src); if retval >= siz, truncation occurred.
 * Function creation history:  http://www.gratisoft.us/todd/papers/strlcpy.html
 */
size_t
strlcpy(char *dst, const char *src, size_t siz)
{
	char	   *d = dst;
	const char *s = src;
	size_t		n = siz;

	/* Copy as many bytes as will fit */
	if (n != 0)
	{
		while (--n != 0)
		{
			if ((*d++ = *s++) == '\0')
				break;
		}
	}

	/* Not enough room in dst, add NUL and traverse rest of src */
	if (n == 0)
	{
		if (siz != 0)
			*d = '\0';			/* NUL-terminate dst */
		while (*s++)
			;
	}

	return (s - src - 1);		/* count does not include NUL */
}