1 /* 2 * Copyright (c) 2008, 2012 by Farsight Security, Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 /* Import. */ 18 19 #include "private.h" 20 21 /* Internal functions. */ 22 23 struct nmsg_buf * _nmsg_buf_new(size_t sz)24_nmsg_buf_new(size_t sz) { 25 struct nmsg_buf *buf; 26 27 buf = calloc(1, sizeof(*buf)); 28 if (buf == NULL) 29 return (NULL); 30 buf->data = calloc(1, sz); 31 if (buf->data == NULL) { 32 free(buf); 33 return (NULL); 34 } 35 return (buf); 36 } 37 38 ssize_t _nmsg_buf_used(struct nmsg_buf * buf)39_nmsg_buf_used(struct nmsg_buf *buf) { 40 assert(buf->pos >= buf->data); 41 return (buf->pos - buf->data); 42 } 43 44 ssize_t _nmsg_buf_avail(struct nmsg_buf * buf)45_nmsg_buf_avail(struct nmsg_buf *buf) { 46 assert(buf->pos <= buf->end); 47 return (buf->end - buf->pos); 48 } 49 50 void _nmsg_buf_destroy(struct nmsg_buf ** buf)51_nmsg_buf_destroy(struct nmsg_buf **buf) { 52 if (*buf != NULL) { 53 if (_nmsg_global_autoclose == true) 54 close((*buf)->fd); 55 if ((*buf)->data != NULL) 56 free((*buf)->data); 57 free(*buf); 58 *buf = NULL; 59 } 60 } 61 62 void _nmsg_buf_reset(struct nmsg_buf * buf)63_nmsg_buf_reset(struct nmsg_buf *buf) { 64 buf->end = buf->pos = buf->data; 65 } 66