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Diffstat (limited to 'include')
| -rw-r--r-- | include/search.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/include/search.h b/include/search.h new file mode 100644 index 0000000000..fccc757e0e --- /dev/null +++ b/include/search.h @@ -0,0 +1,106 @@ +/* + * 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. + * + * The GNU C Library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * The GNU C Library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with the GNU C Library; if not, write to the Free + * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + * 02111-1307 USA. + */ + +/* + * Based on code from uClibc-0.9.30.3 + * Extensions for use within U-Boot + * Copyright (C) 2010 Wolfgang Denk <wd@denx.de> + */ + +#ifndef _SEARCH_H +#define _SEARCH_H 1 + +#include <stddef.h> + +#define __set_errno(val) do { errno = val; } while (0) + +/* + * Prototype structure for a linked-list data structure. + * This is the type used by the `insque' and `remque' functions. + */ + +/* For use with hsearch(3). */ +typedef int (*__compar_fn_t) (__const void *, __const void *); +typedef __compar_fn_t comparison_fn_t; + +/* Action which shall be performed in the call the hsearch. */ +typedef enum { + FIND, + ENTER +} ACTION; + +typedef struct entry { + char *key; + char *data; +} 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; +}; + +/* Create a new hashing table which will at most contain NEL elements. */ +extern int hcreate(size_t __nel); +extern int hcreate_r(size_t __nel, struct hsearch_data *__htab); + +/* Destroy current internal hashing table. */ +extern void hdestroy(void); +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 ENTRY *hsearch(ENTRY __item, ACTION __action); +extern int hsearch_r(ENTRY __item, ACTION __action, ENTRY ** __retval, + struct hsearch_data *__htab); + +/* Search and delete entry matching ITEM.key in internal hash table. */ +extern int hdelete(const char *__key); +extern int hdelete_r(const char *__key, struct hsearch_data *__htab); + +extern ssize_t hexport(const char __sep, char **__resp, size_t __size); +extern ssize_t hexport_r(struct hsearch_data *__htab, + const char __sep, char **__resp, size_t __size); + +extern int himport(const char *__env, size_t __size, const char __sep, + int __flag); +extern int himport_r(struct hsearch_data *__htab, + const char *__env, size_t __size, const char __sep, + int __flag); + +/* Flags for himport() / himport_r() */ +#define H_NOCLEAR 1 /* do not clear hash table before importing */ + +#endif /* search.h */ |