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.
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7 * modify it under the terms of the GNU Lesser General Public
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
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18 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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>
33 #define __set_errno(val) do { errno = val; } while (0)
41 /* Action which shall be performed in the call the hsearch. */
47 typedef struct entry {
50 int (*callback)(const char *name, const char *value, enum env_op op,
54 /* Opaque type for internal use. */
58 * Family of hash table handling functions. The functions also
59 * have reentrant counterparts ending with _r. The non-reentrant
60 * functions all work on a signle internal hashing table.
63 /* Data type for reentrant functions. */
69 * Callback function which will check whether the given change for variable
70 * "item" to "newval" may be applied or not, and possibly apply such change.
71 * When (flag & H_FORCE) is set, it shall not print out any error message and
72 * shall force overwriting of write-once variables.
73 .* Must return 0 for approval, 1 for denial.
75 int (*change_ok)(const ENTRY *__item, const char *newval, enum env_op,
79 /* Create a new hashing table which will at most contain NEL elements. */
80 extern int hcreate_r(size_t __nel, struct hsearch_data *__htab);
82 /* Destroy current internal hashing table. */
83 extern void hdestroy_r(struct hsearch_data *__htab);
86 * Search for entry matching ITEM.key in internal hash table. If
87 * ACTION is `FIND' return found entry or signal error by returning
88 * NULL. If ACTION is `ENTER' replace existing data (if any) with
91 extern int hsearch_r(ENTRY __item, ACTION __action, ENTRY ** __retval,
92 struct hsearch_data *__htab, int __flag);
95 * Search for an entry matching `MATCH'. Otherwise, Same semantics
98 extern int hmatch_r(const char *__match, int __last_idx, ENTRY ** __retval,
99 struct hsearch_data *__htab);
101 * Search for an entry whose key or data contains `MATCH'. Otherwise,
102 * Same semantics as hsearch_r().
104 extern int hstrstr_r(const char *__match, int __last_idx, ENTRY ** __retval,
105 struct hsearch_data *__htab);
107 /* Search and delete entry matching ITEM.key in internal hash table. */
108 extern int hdelete_r(const char *__key, struct hsearch_data *__htab,
111 extern ssize_t hexport_r(struct hsearch_data *__htab,
112 const char __sep, int __flag, char **__resp, size_t __size,
113 int argc, char * const argv[]);
116 * nvars: length of vars array
117 * vars: array of strings (variable names) to import (nvars == 0 means all)
118 * do_apply: whether to call callback function to check the new argument,
119 * and possibly apply changes (false means accept everything)
121 extern int himport_r(struct hsearch_data *__htab,
122 const char *__env, size_t __size, const char __sep,
123 int __flag, int nvars, char * const vars[]);
125 /* Walk the whole table calling the callback on each element */
126 extern int hwalk_r(struct hsearch_data *__htab, int (*callback)(ENTRY *));
128 /* Flags for himport_r(), hexport_r(), hdelete_r(), and hsearch_r() */
129 #define H_NOCLEAR (1 << 0) /* do not clear hash table before importing */
130 #define H_FORCE (1 << 1) /* overwrite read-only/write-once variables */
131 #define H_INTERACTIVE (1 << 2) /* indicate that an import is user directed */
132 #define H_HIDE_DOT (1 << 3) /* don't print env vars that begin with '.' */
134 #endif /* search.h */