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env: Add support for callbacks to environment vars

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Add support for per-variable callbacks to the "hashtable" functions.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

!!!fix comment in callback
This commit is contained in:
Joe Hershberger
2012-12-11 22:16:24 -06:00
committed by Tom Rini
parent be11235ab8
commit 170ab11075
10 changed files with 592 additions and 4 deletions
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55
include/env_attr.h Normal file
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/*
* (C) Copyright 2012
* Joe Hershberger, National Instruments, joe.hershberger@ni.com
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef __ENV_ATTR_H__
#define __ENV_ATTR_H__
#define ENV_ATTR_LIST_DELIM ','
#define ENV_ATTR_SEP ':'
/*
* env_attr_walk takes as input an "attr_list" that takes the form:
* attributes = [^,:\s]*
* entry = name[:attributes]
* list = entry[,list]
* It will call the "callback" function with the "name" and attribute as "value"
* The callback may return a non-0 to abort the list walk.
* This return value will be passed through to the caller.
* 0 is returned on success.
*/
extern int env_attr_walk(const char *attr_list,
int (*callback)(const char *name, const char *value));
/*
* env_attr_lookup takes as input an "attr_list" with the same form as above.
* It also takes as input a "name" to look for.
* If the name is found in the list, it's value is copied into "attributes".
* There is no protection on attributes being too small for the value.
* It returns -1 if attributes is NULL, 1 if "name" is not found, 2 if
* "attr_list" is NULL.
* Returns 0 on success.
*/
extern int env_attr_lookup(const char *attr_list, const char *name,
char *attributes);
#endif /* __ENV_ATTR_H__ */