summaryrefslogtreecommitdiffstats
path: root/lib/librte_kvargs/rte_kvargs.h
blob: ae9ae79f21853780f23d1880581d7f26258ddaa4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
 *   Copyright(c) 2014 6WIND S.A.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _RTE_KVARGS_H_
#define _RTE_KVARGS_H_

/**
 * @file
 * RTE Argument parsing
 *
 * This module can be used to parse arguments whose format is
 * key1=value1,key2=value2,key3=value3,...
 *
 * The same key can appear several times with the same or a different
 * value. Indeed, the arguments are stored as a list of key/values
 * associations and not as a dictionary.
 *
 * This file provides some helpers that are especially used by virtual
 * ethernet devices at initialization for arguments parsing.
 */

#ifdef __cplusplus
extern "C" {
#endif

/** Maximum number of key/value associations */
#define RTE_KVARGS_MAX 32

/** separator character used between each pair */
#define RTE_KVARGS_PAIRS_DELIM	","

/** separator character used between key and value */
#define RTE_KVARGS_KV_DELIM	"="

/** Type of callback function used by rte_kvargs_process() */
typedef int (*arg_handler_t)(const char *key, const char *value, void *opaque);

/** A key/value association */
struct rte_kvargs_pair {
	char *key;      /**< the name (key) of the association  */
	char *value;    /**< the value associated to that key */
};

/** Store a list of key/value associations */
struct rte_kvargs {
	char *str;      /**< copy of the argument string */
	unsigned count; /**< number of entries in the list */
	struct rte_kvargs_pair pairs[RTE_KVARGS_MAX]; /**< list of key/values */
};

/**
 * Allocate a rte_kvargs and store key/value associations from a string
 *
 * The function allocates and fills a rte_kvargs structure from a given
 * string whose format is key1=value1,key2=value2,...
 *
 * The structure can be freed with rte_kvargs_free().
 *
 * @param args
 *   The input string containing the key/value associations
 * @param valid_keys
 *   A list of valid keys (table of const char *, the last must be NULL).
 *   This argument is ignored if NULL
 *
 * @return
 *   - A pointer to an allocated rte_kvargs structure on success
 *   - NULL on error
 */
struct rte_kvargs *rte_kvargs_parse(const char *args, const char *valid_keys[]);

/**
 * Free a rte_kvargs structure
 *
 * Free a rte_kvargs structure previously allocated with
 * rte_kvargs_parse().
 *
 * @param kvlist
 *   The rte_kvargs structure
 */
void rte_kvargs_free(struct rte_kvargs *kvlist);

/**
 * Call a handler function for each key/value matching the key
 *
 * For each key/value association that matches the given key, calls the
 * handler function with the for a given arg_name passing the value on the
 * dictionary for that key and a given extra argument. If *kvlist* is NULL
 * function does nothing.
 *
 * @param kvlist
 *   The rte_kvargs structure
 * @param key_match
 *   The key on which the handler should be called, or NULL to process handler
 *   on all associations
 * @param handler
 *   The function to call for each matching key
 * @param opaque_arg
 *   A pointer passed unchanged to the handler
 *
 * @return
 *   - 0 on success
 *   - Negative on error
 */
int rte_kvargs_process(const struct rte_kvargs *kvlist,
	const char *key_match, arg_handler_t handler, void *opaque_arg);

/**
 * Count the number of associations matching the given key
 *
 * @param kvlist
 *   The rte_kvargs structure
 * @param key_match
 *   The key that should match, or NULL to count all associations

 * @return
 *   The number of entries
 */
unsigned rte_kvargs_count(const struct rte_kvargs *kvlist,
	const char *key_match);

#ifdef __cplusplus
}
#endif

#endif