diff options
Diffstat (limited to 'include/search.h')
| -rw-r--r-- | include/search.h | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/include/search.h b/include/search.h index ef53edb..93e1cbc 100644 --- a/include/search.h +++ b/include/search.h @@ -57,13 +57,23 @@ struct hsearch_data { struct _ENTRY *table; unsigned int size; unsigned int filled; +/* + * Callback function which will check whether the given change for variable + * "name" from "oldval" to "newval" may be applied or not, and possibly apply + * such change. + * When (flag & H_FORCE) is set, it shall not print out any error message and + * shall force overwriting of write-once variables. +.* Must return 0 for approval, 1 for denial. + */ + int (*apply)(const char *name, const char *oldval, + const char *newval, int flag); }; /* Create a new hashing table which will at most contain NEL elements. */ extern int hcreate_r(size_t __nel, struct hsearch_data *__htab); /* Destroy current internal hashing table. */ -extern void hdestroy_r(struct hsearch_data *__htab); +extern void hdestroy_r(struct hsearch_data *__htab, int do_apply); /* * Search for entry matching ITEM.key in internal hash table. If @@ -88,17 +98,25 @@ extern int hstrstr_r(const char *__match, int __last_idx, ENTRY ** __retval, struct hsearch_data *__htab); /* Search and delete entry matching ITEM.key in internal hash table. */ -extern int hdelete_r(const char *__key, struct hsearch_data *__htab); +extern int hdelete_r(const char *__key, struct hsearch_data *__htab, + int do_apply); extern ssize_t hexport_r(struct hsearch_data *__htab, const char __sep, char **__resp, size_t __size, int argc, char * const argv[]); +/* + * nvars: length of vars array + * vars: array of strings (variable names) to import (nvars == 0 means all) + * do_apply: whether to call callback function to check the new argument, + * and possibly apply changes (false means accept everything) + */ extern int himport_r(struct hsearch_data *__htab, const char *__env, size_t __size, const char __sep, - int __flag); + int __flag, int nvars, char * const vars[], int do_apply); /* Flags for himport_r() */ -#define H_NOCLEAR 1 /* do not clear hash table before importing */ +#define H_NOCLEAR (1 << 0) /* do not clear hash table before importing */ +#define H_FORCE (1 << 1) /* overwrite read-only/write-once variables */ #endif /* search.h */ |