include/env_attr.h

   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__ */