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Wolfgang Denka6826fb2010-06-20 13:17:12 +02001/*
2 * Declarations for System V style searching functions.
3 * Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc.
4 * This file is part of the GNU C Library.
5 *
6 * The GNU C Library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * The GNU C Library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with the GNU C Library; if not, write to the Free
18 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 * 02111-1307 USA.
20 */
21
22/*
23 * Based on code from uClibc-0.9.30.3
24 * Extensions for use within U-Boot
25 * Copyright (C) 2010 Wolfgang Denk <wd@denx.de>
26 */
27
28#ifndef _SEARCH_H
29#define _SEARCH_H 1
30
31#include <stddef.h>
32
33#define __set_errno(val) do { errno = val; } while (0)
34
Joe Hershberger7afcf3a2012-12-11 22:16:21 -060035enum env_op {
36 env_op_create,
37 env_op_delete,
38 env_op_overwrite,
39};
40
Wolfgang Denka6826fb2010-06-20 13:17:12 +020041/* Action which shall be performed in the call the hsearch. */
42typedef enum {
43 FIND,
44 ENTER
45} ACTION;
46
47typedef struct entry {
Wolfgang Denk84b5e802011-07-29 14:42:18 +020048 const char *key;
Wolfgang Denka6826fb2010-06-20 13:17:12 +020049 char *data;
Joe Hershberger170ab112012-12-11 22:16:24 -060050 int (*callback)(const char *name, const char *value, enum env_op op,
51 int flags);
Joe Hershberger25980902012-12-11 22:16:31 -060052 int flags;
Wolfgang Denka6826fb2010-06-20 13:17:12 +020053} ENTRY;
54
55/* Opaque type for internal use. */
56struct _ENTRY;
57
58/*
59 * Family of hash table handling functions. The functions also
60 * have reentrant counterparts ending with _r. The non-reentrant
61 * functions all work on a signle internal hashing table.
62 */
63
64/* Data type for reentrant functions. */
65struct hsearch_data {
66 struct _ENTRY *table;
67 unsigned int size;
68 unsigned int filled;
Gerlando Falautoc5983592012-08-24 00:11:39 +000069/*
70 * Callback function which will check whether the given change for variable
Joe Hershberger7afcf3a2012-12-11 22:16:21 -060071 * "item" to "newval" may be applied or not, and possibly apply such change.
Gerlando Falautoc5983592012-08-24 00:11:39 +000072 * When (flag & H_FORCE) is set, it shall not print out any error message and
73 * shall force overwriting of write-once variables.
74.* Must return 0 for approval, 1 for denial.
75 */
Joe Hershberger7afcf3a2012-12-11 22:16:21 -060076 int (*change_ok)(const ENTRY *__item, const char *newval, enum env_op,
77 int flag);
Wolfgang Denka6826fb2010-06-20 13:17:12 +020078};
79
80/* Create a new hashing table which will at most contain NEL elements. */
Wolfgang Denka6826fb2010-06-20 13:17:12 +020081extern int hcreate_r(size_t __nel, struct hsearch_data *__htab);
82
83/* Destroy current internal hashing table. */
Joe Hershbergerc4e00572012-12-11 22:16:19 -060084extern void hdestroy_r(struct hsearch_data *__htab);
Wolfgang Denka6826fb2010-06-20 13:17:12 +020085
86/*
87 * Search for entry matching ITEM.key in internal hash table. If
88 * ACTION is `FIND' return found entry or signal error by returning
89 * NULL. If ACTION is `ENTER' replace existing data (if any) with
90 * ITEM.data.
91 * */
Wolfgang Denka6826fb2010-06-20 13:17:12 +020092extern int hsearch_r(ENTRY __item, ACTION __action, ENTRY ** __retval,
Joe Hershbergerc4e00572012-12-11 22:16:19 -060093 struct hsearch_data *__htab, int __flag);
Wolfgang Denka6826fb2010-06-20 13:17:12 +020094
Mike Frysinger560d4242010-12-17 16:51:59 -050095/*
96 * Search for an entry matching `MATCH'. Otherwise, Same semantics
97 * as hsearch_r().
98 */
99extern int hmatch_r(const char *__match, int __last_idx, ENTRY ** __retval,
100 struct hsearch_data *__htab);
Kim Phillipsa000b792011-04-05 07:15:14 +0000101/*
102 * Search for an entry whose key or data contains `MATCH'. Otherwise,
103 * Same semantics as hsearch_r().
104 */
105extern int hstrstr_r(const char *__match, int __last_idx, ENTRY ** __retval,
106 struct hsearch_data *__htab);
Mike Frysinger560d4242010-12-17 16:51:59 -0500107
Wolfgang Denka6826fb2010-06-20 13:17:12 +0200108/* Search and delete entry matching ITEM.key in internal hash table. */
Gerlando Falauto152874b2012-08-24 00:11:40 +0000109extern int hdelete_r(const char *__key, struct hsearch_data *__htab,
Joe Hershbergerc4e00572012-12-11 22:16:19 -0600110 int __flag);
Wolfgang Denka6826fb2010-06-20 13:17:12 +0200111
Wolfgang Denka6826fb2010-06-20 13:17:12 +0200112extern ssize_t hexport_r(struct hsearch_data *__htab,
Joe Hershbergerbe112352012-12-11 22:16:23 -0600113 const char __sep, int __flag, char **__resp, size_t __size,
Wolfgang Denk37f2fe72011-11-06 22:49:44 +0100114 int argc, char * const argv[]);
Wolfgang Denka6826fb2010-06-20 13:17:12 +0200115
Gerlando Falauto348b1f12012-08-24 00:11:38 +0000116/*
117 * nvars: length of vars array
118 * vars: array of strings (variable names) to import (nvars == 0 means all)
Gerlando Falautoc5983592012-08-24 00:11:39 +0000119 * do_apply: whether to call callback function to check the new argument,
120 * and possibly apply changes (false means accept everything)
Gerlando Falauto348b1f12012-08-24 00:11:38 +0000121 */
Wolfgang Denka6826fb2010-06-20 13:17:12 +0200122extern int himport_r(struct hsearch_data *__htab,
123 const char *__env, size_t __size, const char __sep,
Joe Hershbergerc4e00572012-12-11 22:16:19 -0600124 int __flag, int nvars, char * const vars[]);
Wolfgang Denka6826fb2010-06-20 13:17:12 +0200125
Joe Hershberger170ab112012-12-11 22:16:24 -0600126/* Walk the whole table calling the callback on each element */
127extern int hwalk_r(struct hsearch_data *__htab, int (*callback)(ENTRY *));
128
Joe Hershbergerbe112352012-12-11 22:16:23 -0600129/* Flags for himport_r(), hexport_r(), hdelete_r(), and hsearch_r() */
Joe Hershbergerc4e00572012-12-11 22:16:19 -0600130#define H_NOCLEAR (1 << 0) /* do not clear hash table before importing */
131#define H_FORCE (1 << 1) /* overwrite read-only/write-once variables */
132#define H_INTERACTIVE (1 << 2) /* indicate that an import is user directed */
Joe Hershbergerbe112352012-12-11 22:16:23 -0600133#define H_HIDE_DOT (1 << 3) /* don't print env vars that begin with '.' */
Wolfgang Denka6826fb2010-06-20 13:17:12 +0200134
135#endif /* search.h */