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123 lines
4.1 KiB
C
123 lines
4.1 KiB
C
/*
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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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* SPDX-License-Identifier: LGPL-2.1+
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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 1
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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_op {
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env_op_create,
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env_op_delete,
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env_op_overwrite,
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};
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/* Action which shall be performed in the call the hsearch. */
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typedef enum {
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FIND,
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ENTER
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} ACTION;
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typedef struct 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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} ENTRY;
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/* Opaque type for internal use. */
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struct _ENTRY;
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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 signle internal hashing 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 _ENTRY *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 ENTRY *__item, const char *newval, enum env_op,
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int flag);
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};
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/* Create a new hashing table which will at most contain NEL elements. */
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extern int hcreate_r(size_t __nel, struct hsearch_data *__htab);
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/* Destroy current internal hashing table. */
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extern 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 `FIND' return found entry or signal error by returning
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* NULL. If ACTION is `ENTER' replace existing data (if any) with
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* ITEM.data.
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* */
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extern int hsearch_r(ENTRY __item, ACTION __action, ENTRY ** __retval,
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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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extern int hmatch_r(const char *__match, int __last_idx, ENTRY ** __retval,
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struct hsearch_data *__htab);
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/* Search and delete entry matching ITEM.key in internal hash table. */
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extern int hdelete_r(const char *__key, struct hsearch_data *__htab,
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int __flag);
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extern ssize_t hexport_r(struct hsearch_data *__htab,
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const char __sep, int __flag, char **__resp, size_t __size,
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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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* do_apply: whether to call callback function to check the new argument,
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* and possibly apply changes (false means accept everything)
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*/
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extern int himport_r(struct hsearch_data *__htab,
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const char *__env, size_t __size, const char __sep,
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int __flag, int nvars, char * const vars[]);
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/* Walk the whole table calling the callback on each element */
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extern int hwalk_r(struct hsearch_data *__htab, int (*callback)(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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#endif /* search.h */
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