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_add_head.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 /* add at head */ 00029 00030 static inline void 00031 __cirbuf_add_head(struct cirbuf * cbuf, char c) 00032 { 00033 if (!CIRBUF_IS_EMPTY(cbuf)) { 00034 cbuf->start += (cbuf->maxlen - 1); 00035 cbuf->start %= cbuf->maxlen; 00036 } 00037 cbuf->buf[cbuf->start] = c; 00038 cbuf->len ++; 00039 } 00040 00041 cirbuf_int 00042 cirbuf_add_head_safe(struct cirbuf * cbuf, char c) 00043 { 00044 if (cbuf && !CIRBUF_IS_FULL(cbuf)) { 00045 __cirbuf_add_head(cbuf, c); 00046 return 0; 00047 } 00048 return -EINVAL; 00049 } 00050 00051 void 00052 cirbuf_add_head(struct cirbuf * cbuf, char c) 00053 { 00054 __cirbuf_add_head(cbuf, c); 00055 } 00056
1.5.6