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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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67
lib/hashtable.c
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@@ -54,7 +54,8 @@
#define CONFIG_ENV_MAX_ENTRIES 512
#endif
#include "search.h"
#include <env_callback.h>
#include <search.h>
/*
* [Aho,Sethi,Ullman] Compilers: Principles, Techniques and Tools, 1986
@@ -274,6 +275,17 @@ static inline int _compare_and_overwrite_entry(ENTRY item, ACTION action,
return 0;
}
/* If there is a callback, call it */
if (htab->table[idx].entry.callback &&
htab->table[idx].entry.callback(item.key,
item.data, env_op_overwrite, flag)) {
debug("callback() rejected setting variable "
"%s, skipping it!\n", item.key);
__set_errno(EINVAL);
*retval = NULL;
return 0;
}
free(htab->table[idx].entry.data);
htab->table[idx].entry.data = strdup(item.data);
if (!htab->table[idx].entry.data) {
@@ -398,6 +410,9 @@ int hsearch_r(ENTRY item, ACTION action, ENTRY ** retval,
++htab->filled;
/* This is a new entry, so look up a possible callback */
env_callback_init(&htab->table[idx].entry);
/* check for permission */
if (htab->change_ok != NULL && htab->change_ok(
&htab->table[idx].entry, item.data, env_op_create, flag)) {
@@ -409,6 +424,18 @@ int hsearch_r(ENTRY item, ACTION action, ENTRY ** retval,
return 0;
}
/* If there is a callback, call it */
if (htab->table[idx].entry.callback &&
htab->table[idx].entry.callback(item.key, item.data,
env_op_create, flag)) {
debug("callback() rejected setting variable "
"%s, skipping it!\n", item.key);
_hdelete(item.key, htab, &htab->table[idx].entry, idx);
__set_errno(EINVAL);
*retval = NULL;
return 0;
}
/* return new entry */
*retval = &htab->table[idx].entry;
return 1;
@@ -437,6 +464,7 @@ static void _hdelete(const char *key, struct hsearch_data *htab, ENTRY *ep,
debug("hdelete: DELETING key \"%s\"\n", key);
free((void *)ep->key);
free(ep->data);
ep->callback = NULL;
htab->table[idx].used = -1;
--htab->filled;
@@ -466,6 +494,15 @@ int hdelete_r(const char *key, struct hsearch_data *htab, int flag)
return 0;
}
/* If there is a callback, call it */
if (htab->table[idx].entry.callback &&
htab->table[idx].entry.callback(key, NULL, env_op_delete, flag)) {
debug("callback() rejected deleting variable "
"%s, skipping it!\n", key);
__set_errno(EINVAL);
return 0;
}
_hdelete(key, htab, ep, idx);
return 1;
@@ -838,11 +875,9 @@ int himport_r(struct hsearch_data *htab,
e.data = value;
hsearch_r(e, ENTER, &rv, htab, flag);
if (rv == NULL) {
if (rv == NULL)
printf("himport_r: can't insert \"%s=%s\" into hash table\n",
name, value);
return 0;
}
debug("INSERT: table %p, filled %d/%d rv %p ==> name=\"%s\" value=\"%s\"\n",
htab, htab->filled, htab->size,
@@ -873,3 +908,27 @@ int himport_r(struct hsearch_data *htab,
debug("INSERT: done\n");
return 1; /* everything OK */
}
/*
* hwalk_r()
*/
/*
* Walk all of the entries in the hash, calling the callback for each one.
* this allows some generic operation to be performed on each element.
*/
int hwalk_r(struct hsearch_data *htab, int (*callback)(ENTRY *))
{
int i;
int retval;
for (i = 1; i <= htab->size; ++i) {
if (htab->table[i].used > 0) {
retval = callback(&htab->table[i].entry);
if (retval)
return retval;
}
}
return 0;
}