ngircd/src/portab/strlcpy.c

/*
 * ngIRCd -- The Next Generation IRC Daemon
 * Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * Please read the file COPYING, README and AUTHORS for more information.
 */

#include "portab.h"

/**
 * @file
 * strlcpy() and strlcat() replacement functions.
 *
 * See <http://www.openbsd.org/papers/strlcpy-paper.ps> for details.
 *
 * Code partially borrowed from compat.c of rsync, written by Andrew
 * Tridgell (1998) and Martin Pool (2002):
 * <http://cvs.samba.org/cgi-bin/cvsweb/rsync/lib/compat.c>
 */

#include <string.h>
#include <sys/types.h>

#ifndef HAVE_STRLCAT

GLOBAL size_t
strlcat( char *dst, const char *src, size_t size )
{
	/* Like strncat() but does not 0 fill the buffer and
	 * always null terminates. */

	size_t len1 = strlen( dst );
	size_t len2 = strlen( src );
	size_t ret = len1 + len2;

	if( size && ( len1 < size - 1 )) {
		if( len2 >= size - len1 )
			len2 = size - len1 - 1;
		memcpy( dst + len1, src, len2 );
		dst[len1 + len2] = 0;
	}
	return ret;
} /* strlcat */

#endif

#ifndef HAVE_STRLCPY

GLOBAL size_t
strlcpy( char *dst, const char *src, size_t size )
{
	/* Like strncpy but does not 0 fill the buffer and
	 * always null terminates. */

	size_t len = strlen( src );
	size_t ret = len;

	if( size > 0 ) {
		if( len >= size ) len = size - 1;
		memcpy( dst, src, len );
		dst[len] = 0;
	}
	return ret;
} /* strlcpy */

#endif

/* -eof- */