ceph/src/dpdk/lib/librte_kvargs/rte_kvargs.h

   1 /*-
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   3  *
   4  *   Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
   5  *   Copyright(c) 2014 6WIND S.A.
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  34
  35 #ifndef _RTE_KVARGS_H_
  36 #define _RTE_KVARGS_H_
  37
  38 /**
  39  * @file
  40  * RTE Argument parsing
  41  *
  42  * This module can be used to parse arguments whose format is
  43  * key1=value1,key2=value2,key3=value3,...
  44  *
  45  * The same key can appear several times with the same or a different
  46  * value. Indeed, the arguments are stored as a list of key/values
  47  * associations and not as a dictionary.
  48  *
  49  * This file provides some helpers that are especially used by virtual
  50  * ethernet devices at initialization for arguments parsing.
  51  */
  52
  53 #ifdef __cplusplus
  54 extern "C" {
  55 #endif
  56
  57 /** Maximum number of key/value associations */
  58 #define RTE_KVARGS_MAX 32
  59
  60 /** separator character used between each pair */
  61 #define RTE_KVARGS_PAIRS_DELIM  ","
  62
  63 /** separator character used between key and value */
  64 #define RTE_KVARGS_KV_DELIM     "="
  65
  66 /** Type of callback function used by rte_kvargs_process() */
  67 typedef int (*arg_handler_t)(const char *key, const char *value, void *opaque);
  68
  69 /** A key/value association */
  70 struct rte_kvargs_pair {
  71         char *key;      /**< the name (key) of the association  */
  72         char *value;    /**< the value associated to that key */
  73 };
  74
  75 /** Store a list of key/value associations */
  76 struct rte_kvargs {
  77         char *str;      /**< copy of the argument string */
  78         unsigned count; /**< number of entries in the list */
  79         struct rte_kvargs_pair pairs[RTE_KVARGS_MAX]; /**< list of key/values */
  80 };
  81
  82 /**
  83  * Allocate a rte_kvargs and store key/value associations from a string
  84  *
  85  * The function allocates and fills a rte_kvargs structure from a given
  86  * string whose format is key1=value1,key2=value2,...
  87  *
  88  * The structure can be freed with rte_kvargs_free().
  89  *
  90  * @param args
  91  *   The input string containing the key/value associations
  92  * @param valid_keys
  93  *   A list of valid keys (table of const char *, the last must be NULL).
  94  *   This argument is ignored if NULL
  95  *
  96  * @return
  97  *   - A pointer to an allocated rte_kvargs structure on success
  98  *   - NULL on error
  99  */
 100 struct rte_kvargs *rte_kvargs_parse(const char *args, const char *valid_keys[]);
 101
 102 /**
 103  * Free a rte_kvargs structure
 104  *
 105  * Free a rte_kvargs structure previously allocated with
 106  * rte_kvargs_parse().
 107  *
 108  * @param kvlist
 109  *   The rte_kvargs structure
 110  */
 111 void rte_kvargs_free(struct rte_kvargs *kvlist);
 112
 113 /**
 114  * Call a handler function for each key/value matching the key
 115  *
 116  * For each key/value association that matches the given key, calls the
 117  * handler function with the for a given arg_name passing the value on the
 118  * dictionary for that key and a given extra argument. If *kvlist* is NULL
 119  * function does nothing.
 120  *
 121  * @param kvlist
 122  *   The rte_kvargs structure
 123  * @param key_match
 124  *   The key on which the handler should be called, or NULL to process handler
 125  *   on all associations
 126  * @param handler
 127  *   The function to call for each matching key
 128  * @param opaque_arg
 129  *   A pointer passed unchanged to the handler
 130  *
 131  * @return
 132  *   - 0 on success
 133  *   - Negative on error
 134  */
 135 int rte_kvargs_process(const struct rte_kvargs *kvlist,
 136         const char *key_match, arg_handler_t handler, void *opaque_arg);
 137
 138 /**
 139  * Count the number of associations matching the given key
 140  *
 141  * @param kvlist
 142  *   The rte_kvargs structure
 143  * @param key_match
 144  *   The key that should match, or NULL to count all associations
 145
 146  * @return
 147  *   The number of entries
 148  */
 149 unsigned rte_kvargs_count(const struct rte_kvargs *kvlist,
 150         const char *key_match);
 151
 152 #ifdef __cplusplus
 153 }
 154 #endif
 155
 156 #endif