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