1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * (C) Copyright 2012 4 * Joe Hershberger, National Instruments, joe.hershberger@ni.com 5 */ 6 7 #ifndef __ENV_ATTR_H__ 8 #define __ENV_ATTR_H__ 9 10 #define ENV_ATTR_LIST_DELIM ',' 11 #define ENV_ATTR_SEP ':' 12 13 /* 14 * env_attr_walk takes as input an "attr_list" that takes the form: 15 * attributes = [^,:\s]* 16 * entry = name[:attributes] 17 * list = entry[,list] 18 * It will call the "callback" function with the "name" and "attributes" 19 * The callback may return a non-0 to abort the list walk. 20 * This return value will be passed through to the caller. 21 * 0 is returned on success. 22 */ 23 int env_attr_walk(const char *attr_list, 24 int (*callback)(const char *name, const char *attributes, void *priv), 25 void *priv); 26 27 /* 28 * env_attr_lookup takes as input an "attr_list" with the same form as above. 29 * It also takes as input a "name" to look for. 30 * If the name is found in the list, it's value is copied into "attributes". 31 * There is no protection on attributes being too small for the value. 32 * It returns -1 if attributes is NULL, 1 if "name" is not found, 2 if 33 * "attr_list" is NULL. 34 * Returns 0 on success. 35 */ 36 int env_attr_lookup(const char *attr_list, const char *name, char *attributes); 37 38 #endif /* __ENV_ATTR_H__ */ 39