| Joe Hershberger | 170ab11 | 2012-12-11 22:16:24 -0600 | [diff] [blame] | 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__ */ |