1 /* 2 * (C) Copyright 2012 3 * Joe Hershberger, National Instruments, joe.hershberger@ni.com 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 #ifndef __ENV_ATTR_H__ 25 #define __ENV_ATTR_H__ 26 27 #define ENV_ATTR_LIST_DELIM ',' 28 #define ENV_ATTR_SEP ':' 29 30 /* 31 * env_attr_walk takes as input an "attr_list" that takes the form: 32 * attributes = [^,:\s]* 33 * entry = name[:attributes] 34 * list = entry[,list] 35 * It will call the "callback" function with the "name" and attribute as "value" 36 * The callback may return a non-0 to abort the list walk. 37 * This return value will be passed through to the caller. 38 * 0 is returned on success. 39 */ 40 extern int env_attr_walk(const char *attr_list, 41 int (*callback)(const char *name, const char *value)); 42 43 /* 44 * env_attr_lookup takes as input an "attr_list" with the same form as above. 45 * It also takes as input a "name" to look for. 46 * If the name is found in the list, it's value is copied into "attributes". 47 * There is no protection on attributes being too small for the value. 48 * It returns -1 if attributes is NULL, 1 if "name" is not found, 2 if 49 * "attr_list" is NULL. 50 * Returns 0 on success. 51 */ 52 extern int env_attr_lookup(const char *attr_list, const char *name, 53 char *attributes); 54 55 #endif /* __ENV_ATTR_H__ */ 56