00001 /* 00002 * Copyright Droids Corporation (2007) 00003 * Olivier MATZ <zer0@droids-corp.org> 00004 * 00005 * This program is free software; you can redistribute it and/or modify 00006 * it under the terms of the GNU General Public License as published by 00007 * the Free Software Foundation; either version 2 of the License, or 00008 * (at your option) any later version. 00009 * 00010 * This program is distributed in the hope that it will be useful, 00011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 * GNU General Public License for more details. 00014 * 00015 * You should have received a copy of the GNU General Public License 00016 * along with this program; if not, write to the Free Software 00017 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00018 * 00019 * Revision : $Id: cirbuf_del_tail.c,v 1.2 2008-01-08 20:05:02 zer0 Exp $ 00020 * 00021 */ 00022 00023 #include <string.h> 00024 00025 #include <cirbuf.h> 00026 00027 00028 /* del at tail */ 00029 00030 static inline void 00031 __cirbuf_del_tail(struct cirbuf * cbuf) 00032 { 00033 cbuf->len --; 00034 if (!CIRBUF_IS_EMPTY(cbuf)) { 00035 cbuf->end += (cbuf->maxlen - 1); 00036 cbuf->end %= cbuf->maxlen; 00037 } 00038 } 00039 00040 cirbuf_int 00041 cirbuf_del_tail_safe(struct cirbuf * cbuf) 00042 { 00043 if (cbuf && !CIRBUF_IS_EMPTY(cbuf)) { 00044 __cirbuf_del_tail(cbuf); 00045 return 0; 00046 } 00047 return -EINVAL; 00048 } 00049 00050 void 00051 cirbuf_del_tail(struct cirbuf * cbuf) 00052 { 00053 __cirbuf_del_tail(cbuf); 00054 } 00055 00056
1.5.6