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 typedef struct entry {
31 int (*callback)(const char *name, const char *value, enum env_op op,
36 /* Opaque type for internal use. */
40 * Family of hash table handling functions. The functions also
41 * have reentrant counterparts ending with _r. The non-reentrant
42 * functions all work on a single internal hash table.
45 /* Data type for reentrant functions. */
51 * Callback function which will check whether the given change for variable
52 * "__item" to "newval" may be applied or not, and possibly apply such change.
53 * When (flag & H_FORCE) is set, it shall not print out any error message and
54 * shall force overwriting of write-once variables.
55 * Must return 0 for approval, 1 for denial.
57 int (*change_ok)(const ENTRY *__item, const char *newval, enum env_op,
61 /* Create a new hash table which will contain at most "__nel" elements. */
62 extern int hcreate_r(size_t __nel, struct hsearch_data *__htab);
64 /* Destroy current internal hash table. */
65 extern void hdestroy_r(struct hsearch_data *__htab);
68 * Search for entry matching __item.key in internal hash table. If
69 * ACTION is `FIND' return found entry or signal error by returning
70 * NULL. If ACTION is `ENTER' replace existing data (if any) with
73 extern int hsearch_r(ENTRY __item, ACTION __action, ENTRY ** __retval,
74 struct hsearch_data *__htab, int __flag);
77 * Search for an entry matching "__match". Otherwise, Same semantics
80 extern int hmatch_r(const char *__match, int __last_idx, ENTRY ** __retval,
81 struct hsearch_data *__htab);
83 /* Search and delete entry matching "__key" in internal hash table. */
84 extern int hdelete_r(const char *__key, struct hsearch_data *__htab,
87 extern ssize_t hexport_r(struct hsearch_data *__htab,
88 const char __sep, int __flag, char **__resp, size_t __size,
89 int argc, char * const argv[]);
92 * nvars: length of vars array
93 * vars: array of strings (variable names) to import (nvars == 0 means all)
95 extern int himport_r(struct hsearch_data *__htab,
96 const char *__env, size_t __size, const char __sep,
97 int __flag, int __crlf_is_lf, int nvars,
100 /* Walk the whole table calling the callback on each element */
101 extern int hwalk_r(struct hsearch_data *__htab, int (*callback)(ENTRY *));
103 /* Flags for himport_r(), hexport_r(), hdelete_r(), and hsearch_r() */
104 #define H_NOCLEAR (1 << 0) /* do not clear hash table before importing */
105 #define H_FORCE (1 << 1) /* overwrite read-only/write-once variables */
106 #define H_INTERACTIVE (1 << 2) /* indicate that an import is user directed */
107 #define H_HIDE_DOT (1 << 3) /* don't print env vars that begin with '.' */
108 #define H_MATCH_KEY (1 << 4) /* search/grep key = variable names */
109 #define H_MATCH_DATA (1 << 5) /* search/grep data = variable values */
110 #define H_MATCH_BOTH (H_MATCH_KEY | H_MATCH_DATA) /* search/grep both */
111 #define H_MATCH_IDENT (1 << 6) /* search for indentical strings */
112 #define H_MATCH_SUBSTR (1 << 7) /* search for substring matches */
113 #define H_MATCH_REGEX (1 << 8) /* search for regular expression matches */
114 #define H_MATCH_METHOD (H_MATCH_IDENT | H_MATCH_SUBSTR | H_MATCH_REGEX)
115 #define H_PROGRAMMATIC (1 << 9) /* indicate that an import is from env_set() */
116 #define H_ORIGIN_FLAGS (H_INTERACTIVE | H_PROGRAMMATIC)
118 #endif /* _SEARCH_H_ */