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