forked from rrcarlosr/Jetpack
127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/*
|
|
* Declarations for System V style searching functions.
|
|
* Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc.
|
|
* This file is part of the GNU C Library.
|
|
*
|
|
* SPDX-License-Identifier: LGPL-2.1+
|
|
*/
|
|
|
|
/*
|
|
* Based on code from uClibc-0.9.30.3
|
|
* Extensions for use within U-Boot
|
|
* Copyright (C) 2010-2013 Wolfgang Denk <wd@denx.de>
|
|
*/
|
|
|
|
#ifndef _SEARCH_H
|
|
#define _SEARCH_H 1
|
|
|
|
#include <stddef.h>
|
|
|
|
#define __set_errno(val) do { errno = val; } while (0)
|
|
|
|
enum env_op {
|
|
env_op_create,
|
|
env_op_delete,
|
|
env_op_overwrite,
|
|
};
|
|
|
|
/* Action which shall be performed in the call the hsearch. */
|
|
typedef enum {
|
|
FIND,
|
|
ENTER
|
|
} ACTION;
|
|
|
|
typedef struct entry {
|
|
const char *key;
|
|
char *data;
|
|
int (*callback)(const char *name, const char *value, enum env_op op,
|
|
int flags);
|
|
int flags;
|
|
} ENTRY;
|
|
|
|
/* Opaque type for internal use. */
|
|
struct _ENTRY;
|
|
|
|
/*
|
|
* Family of hash table handling functions. The functions also
|
|
* have reentrant counterparts ending with _r. The non-reentrant
|
|
* functions all work on a signle internal hashing table.
|
|
*/
|
|
|
|
/* Data type for reentrant functions. */
|
|
struct hsearch_data {
|
|
struct _ENTRY *table;
|
|
unsigned int size;
|
|
unsigned int filled;
|
|
/*
|
|
* Callback function which will check whether the given change for variable
|
|
* "item" 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 (*change_ok)(const ENTRY *__item, const char *newval, enum env_op,
|
|
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);
|
|
|
|
/*
|
|
* Search for entry matching ITEM.key in internal hash table. If
|
|
* ACTION is `FIND' return found entry or signal error by returning
|
|
* NULL. If ACTION is `ENTER' replace existing data (if any) with
|
|
* ITEM.data.
|
|
* */
|
|
extern int hsearch_r(ENTRY __item, ACTION __action, ENTRY ** __retval,
|
|
struct hsearch_data *__htab, int __flag);
|
|
|
|
/*
|
|
* Search for an entry matching `MATCH'. Otherwise, Same semantics
|
|
* as hsearch_r().
|
|
*/
|
|
extern int hmatch_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,
|
|
int __flag);
|
|
|
|
extern ssize_t hexport_r(struct hsearch_data *__htab,
|
|
const char __sep, int __flag, 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 __crlf_is_lf, int nvars,
|
|
char * const vars[]);
|
|
|
|
/* Walk the whole table calling the callback on each element */
|
|
extern int hwalk_r(struct hsearch_data *__htab, int (*callback)(ENTRY *));
|
|
|
|
/* Flags for himport_r(), hexport_r(), hdelete_r(), and hsearch_r() */
|
|
#define H_NOCLEAR (1 << 0) /* do not clear hash table before importing */
|
|
#define H_FORCE (1 << 1) /* overwrite read-only/write-once variables */
|
|
#define H_INTERACTIVE (1 << 2) /* indicate that an import is user directed */
|
|
#define H_HIDE_DOT (1 << 3) /* don't print env vars that begin with '.' */
|
|
#define H_MATCH_KEY (1 << 4) /* search/grep key = variable names */
|
|
#define H_MATCH_DATA (1 << 5) /* search/grep data = variable values */
|
|
#define H_MATCH_BOTH (H_MATCH_KEY | H_MATCH_DATA) /* search/grep both */
|
|
#define H_MATCH_IDENT (1 << 6) /* search for indentical strings */
|
|
#define H_MATCH_SUBSTR (1 << 7) /* search for substring matches */
|
|
#define H_MATCH_REGEX (1 << 8) /* search for regular expression matches */
|
|
#define H_MATCH_METHOD (H_MATCH_IDENT | H_MATCH_SUBSTR | H_MATCH_REGEX)
|
|
#define H_PROGRAMMATIC (1 << 9) /* indicate that an import is from setenv() */
|
|
#define H_ORIGIN_FLAGS (H_INTERACTIVE | H_PROGRAMMATIC)
|
|
|
|
#endif /* search.h */
|