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107 lines
3.3 KiB
C
107 lines
3.3 KiB
C
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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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* The GNU C Library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* The GNU C Library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with the GNU C Library; if not, write to the Free
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* Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA.
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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 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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/*
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* Prototype structure for a linked-list data structure.
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* This is the type used by the `insque' and `remque' functions.
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*/
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/* For use with hsearch(3). */
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typedef int (*__compar_fn_t) (__const void *, __const void *);
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typedef __compar_fn_t comparison_fn_t;
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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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char *key;
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char *data;
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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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/* Create a new hashing table which will at most contain NEL elements. */
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extern int hcreate(size_t __nel);
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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(void);
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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 ENTRY *hsearch(ENTRY __item, ACTION __action);
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extern int hsearch_r(ENTRY __item, ACTION __action, 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(const char *__key);
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extern int hdelete_r(const char *__key, struct hsearch_data *__htab);
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extern ssize_t hexport(const char __sep, char **__resp, size_t __size);
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extern ssize_t hexport_r(struct hsearch_data *__htab,
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const char __sep, char **__resp, size_t __size);
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extern int himport(const char *__env, size_t __size, const char __sep,
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int __flag);
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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);
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/* Flags for himport() / himport_r() */
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#define H_NOCLEAR 1 /* do not clear hash table before importing */
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#endif /* search.h */
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