1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 * Declarations for System V style searching functions.
4 * Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc.
5 * This file is part of the GNU C Library.
9 * Based on code from uClibc-0.9.30.3
10 * Extensions for use within U-Boot
11 * Copyright (C) 2010-2013 Wolfgang Denk <wd@denx.de>
20 #define __set_errno(val) do { errno = val; } while (0)
22 /* Action which shall be performed in the call to hsearch. */
28 /** struct env_entry - An entry in the environment hashtable */
32 int (*callback)(const char *name, const char *value, enum env_op op,
37 /* Opaque type for internal use. */
41 * Family of hash table handling functions. The functions also
42 * have reentrant counterparts ending with _r. The non-reentrant
43 * functions all work on a single internal hash table.
46 /* Data type for reentrant functions. */
52 * Callback function which will check whether the given change for variable
53 * "__item" to "newval" may be applied or not, and possibly apply such change.
54 * When (flag & H_FORCE) is set, it shall not print out any error message and
55 * shall force overwriting of write-once variables.
56 * Must return 0 for approval, 1 for denial.
58 int (*change_ok)(const struct env_entry *__item, const char *newval,
59 enum env_op, int flag);
62 /* Create a new hash table which will contain at most "__nel" elements. */
63 extern int hcreate_r(size_t __nel, struct hsearch_data *__htab);
65 /* Destroy current internal hash table. */
66 extern void hdestroy_r(struct hsearch_data *__htab);
69 * Search for entry matching __item.key in internal hash table. If
70 * ACTION is `FIND' return found entry or signal error by returning
71 * NULL. If ACTION is `ENTER' replace existing data (if any) with
74 extern int hsearch_r(struct env_entry __item, ACTION __action,
75 struct env_entry **__retval, struct hsearch_data *__htab,
79 * Search for an entry matching "__match". Otherwise, Same semantics
82 extern int hmatch_r(const char *__match, int __last_idx,
83 struct env_entry **__retval, struct hsearch_data *__htab);
85 /* Search and delete entry matching "__key" in internal hash table. */
86 extern int hdelete_r(const char *__key, struct hsearch_data *__htab,
89 extern ssize_t hexport_r(struct hsearch_data *__htab,
90 const char __sep, int __flag, char **__resp, size_t __size,
91 int argc, char * const argv[]);
94 * nvars: length of vars array
95 * vars: array of strings (variable names) to import (nvars == 0 means all)
97 extern int himport_r(struct hsearch_data *__htab,
98 const char *__env, size_t __size, const char __sep,
99 int __flag, int __crlf_is_lf, int nvars,
100 char * const vars[]);
102 /* Walk the whole table calling the callback on each element */
103 extern int hwalk_r(struct hsearch_data *__htab,
104 int (*callback)(struct env_entry *entry));
106 /* Flags for himport_r(), hexport_r(), hdelete_r(), and hsearch_r() */
107 #define H_NOCLEAR (1 << 0) /* do not clear hash table before importing */
108 #define H_FORCE (1 << 1) /* overwrite read-only/write-once variables */
109 #define H_INTERACTIVE (1 << 2) /* indicate that an import is user directed */
110 #define H_HIDE_DOT (1 << 3) /* don't print env vars that begin with '.' */
111 #define H_MATCH_KEY (1 << 4) /* search/grep key = variable names */
112 #define H_MATCH_DATA (1 << 5) /* search/grep data = variable values */
113 #define H_MATCH_BOTH (H_MATCH_KEY | H_MATCH_DATA) /* search/grep both */
114 #define H_MATCH_IDENT (1 << 6) /* search for indentical strings */
115 #define H_MATCH_SUBSTR (1 << 7) /* search for substring matches */
116 #define H_MATCH_REGEX (1 << 8) /* search for regular expression matches */
117 #define H_MATCH_METHOD (H_MATCH_IDENT | H_MATCH_SUBSTR | H_MATCH_REGEX)
118 #define H_PROGRAMMATIC (1 << 9) /* indicate that an import is from env_set() */
119 #define H_ORIGIN_FLAGS (H_INTERACTIVE | H_PROGRAMMATIC)
121 #endif /* _SEARCH_H_ */