115 lines
4.0 KiB
C
115 lines
4.0 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/*
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* Declarations for System V style searching functions.
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* Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc.
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* This file is part of the GNU C Library.
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*/
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/*
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* Based on code from uClibc-0.9.30.3
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* Extensions for use within U-Boot
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* Copyright (C) 2010-2013 Wolfgang Denk <wd@denx.de>
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*/
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#ifndef _SEARCH_H_
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#define _SEARCH_H_
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#include <env.h>
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#include <stddef.h>
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#define set_errno(val) do { errno = val; } while (0)
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/* enum env_action: action which shall be performed in the call to hsearch */
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enum env_action {
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ENV_FIND,
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ENV_ENTER,
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};
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/** struct env_entry - An entry in the environment hashtable */
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struct env_entry {
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const char *key;
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char *data;
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int (*callback)(const char *name, const char *value, enum env_op op,
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int flags);
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int flags;
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};
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/*
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* Family of hash table handling functions. The functions also
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* have reentrant counterparts ending with _r. The non-reentrant
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* functions all work on a single internal hash table.
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*/
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/* Data type for reentrant functions. */
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struct hsearch_data {
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struct env_entry_node *table;
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unsigned int size;
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unsigned int filled;
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/*
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* Callback function which will check whether the given change for variable
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* "item" to "newval" may be applied or not, and possibly apply such change.
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* When (flag & H_FORCE) is set, it shall not print out any error message and
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* shall force overwriting of write-once variables.
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* Must return 0 for approval, 1 for denial.
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*/
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int (*change_ok)(const struct env_entry *item, const char *newval,
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enum env_op, int flag);
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};
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/* Create a new hash table which will contain at most "nel" elements. */
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int hcreate_r(size_t nel, struct hsearch_data *htab);
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/* Destroy current internal hash table. */
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void hdestroy_r(struct hsearch_data *htab);
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/*
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* Search for entry matching item.key in internal hash table. If
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* action is `ENV_FIND' return found entry or signal error by returning
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* NULL. If action is `ENV_ENTER' replace existing data (if any) with
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* item.data.
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* */
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int hsearch_r(struct env_entry item, enum env_action action,
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struct env_entry **retval, struct hsearch_data *htab, int flag);
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/*
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* Search for an entry matching "match". Otherwise, Same semantics
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* as hsearch_r().
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*/
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int hmatch_r(const char *match, int last_idx, struct env_entry **retval,
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struct hsearch_data *htab);
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/* Search and delete entry matching "key" in internal hash table. */
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int hdelete_r(const char *key, struct hsearch_data *htab, int flag);
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ssize_t hexport_r(struct hsearch_data *htab, const char sep, int flag,
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char **resp, size_t size, int argc, char * const argv[]);
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/*
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* nvars: length of vars array
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* vars: array of strings (variable names) to import (nvars == 0 means all)
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*/
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int himport_r(struct hsearch_data *htab, const char *env, size_t size,
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const char sep, int flag, int crlf_is_lf, int nvars,
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char * const vars[]);
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/* Walk the whole table calling the callback on each element */
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int hwalk_r(struct hsearch_data *htab,
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int (*callback)(struct env_entry *entry));
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/* Flags for himport_r(), hexport_r(), hdelete_r(), and hsearch_r() */
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#define H_NOCLEAR (1 << 0) /* do not clear hash table before importing */
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#define H_FORCE (1 << 1) /* overwrite read-only/write-once variables */
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#define H_INTERACTIVE (1 << 2) /* indicate that an import is user directed */
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#define H_HIDE_DOT (1 << 3) /* don't print env vars that begin with '.' */
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#define H_MATCH_KEY (1 << 4) /* search/grep key = variable names */
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#define H_MATCH_DATA (1 << 5) /* search/grep data = variable values */
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#define H_MATCH_BOTH (H_MATCH_KEY | H_MATCH_DATA) /* search/grep both */
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#define H_MATCH_IDENT (1 << 6) /* search for indentical strings */
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#define H_MATCH_SUBSTR (1 << 7) /* search for substring matches */
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#define H_MATCH_REGEX (1 << 8) /* search for regular expression matches */
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#define H_MATCH_METHOD (H_MATCH_IDENT | H_MATCH_SUBSTR | H_MATCH_REGEX)
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#define H_PROGRAMMATIC (1 << 9) /* indicate that an import is from env_set() */
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#define H_ORIGIN_FLAGS (H_INTERACTIVE | H_PROGRAMMATIC)
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#endif /* _SEARCH_H_ */
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