diff options
Diffstat (limited to 'lib/hashtable.c')
| -rw-r--r-- | lib/hashtable.c | 67 |
1 files changed, 63 insertions, 4 deletions
diff --git a/lib/hashtable.c b/lib/hashtable.c index 7c6b96c..e922666 100644 --- a/lib/hashtable.c +++ b/lib/hashtable.c @@ -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; +} |