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Joe Hershberger170ab112012-12-11 22:16:24 -06001/*
2 * (C) Copyright 2012
3 * Joe Hershberger, National Instruments, joe.hershberger@ni.com
4 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02005 * SPDX-License-Identifier: GPL-2.0+
Joe Hershberger170ab112012-12-11 22:16:24 -06006 */
7
8#ifndef __ENV_ATTR_H__
9#define __ENV_ATTR_H__
10
11#define ENV_ATTR_LIST_DELIM ','
12#define ENV_ATTR_SEP ':'
13
14/*
15 * env_attr_walk takes as input an "attr_list" that takes the form:
16 * attributes = [^,:\s]*
17 * entry = name[:attributes]
18 * list = entry[,list]
19 * It will call the "callback" function with the "name" and attribute as "value"
20 * The callback may return a non-0 to abort the list walk.
21 * This return value will be passed through to the caller.
22 * 0 is returned on success.
23 */
24extern int env_attr_walk(const char *attr_list,
25 int (*callback)(const char *name, const char *value));
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 */
36extern int env_attr_lookup(const char *attr_list, const char *name,
37 char *attributes);
38
39#endif /* __ENV_ATTR_H__ */