adk/tools/strmap.h

   1 /*
   2  *    strmap version 1.0.0
   3  *
   4  *    ANSI C hash table for strings.
   5  *
   6  *    strmap.h
   7  *
   8  *    Copyright (c) 2009 Per Ola Kristensson.
   9  *
  10  *    Per Ola Kristensson <pok21@cam.ac.uk>
  11  *    Inference Group, Department of Physics
  12  *    University of Cambridge
  13  *    Cavendish Laboratory
  14  *    JJ Thomson Avenue
  15  *    CB3 0HE Cambridge
  16  *    United Kingdom
  17  *
  18  *    strmap is free software: you can redistribute it and/or modify
  19  *    it under the terms of the GNU Lesser General Public License as published by
  20  *    the Free Software Foundation, either version 3 of the License, or
  21  *    (at your option) any later version.
  22  *
  23  *    strmap is distributed in the hope that it will be useful,
  24  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *    GNU Lesser General Public License for more details.
  27  *
  28  *    You should have received a copy of the GNU Lesser General Public License
  29  *    along with strmap.  If not, see <http://www.gnu.org/licenses/>.
  30  */
  31 #ifndef _STRMAP_H_
  32 #define _STRMAP_H_
  33
  34 #ifdef __cplusplus
  35 extern "C"
  36 {
  37 #endif
  38
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 typedef struct StrMap StrMap;
  43
  44 /*
  45  * This callback function is called once per key-value when enumerating
  46  * all keys associated to values.
  47  *
  48  * Parameters:
  49  *
  50  * key: A pointer to a null-terminated C string. The string must not
  51  * be modified by the client.
  52  *
  53  * value: A pointer to a null-terminated C string. The string must
  54  * not be modified by the client.
  55  *
  56  * obj: A pointer to a client-specific object. This parameter may be
  57  * null.
  58  *
  59  * Return value: None.
  60  */
  61 typedef void(*strmap_enum_func)(const char *key, const char *value, const void *obj);
  62
  63 /*
  64  * Creates a string map.
  65  *
  66  * Parameters:
  67  *
  68  * capacity: The number of top-level slots this string map
  69  * should allocate. This parameter must be > 0.
  70  *
  71  * Return value: A pointer to a string map object,
  72  * or null if a new string map could not be allocated.
  73  */
  74 StrMap * strmap_new(unsigned int capacity);
  75
  76 /*
  77  * Releases all memory held by a string map object.
  78  *
  79  * Parameters:
  80  *
  81  * map: A pointer to a string map. This parameter cannot be null.
  82  * If the supplied string map has been previously released, the
  83  * behaviour of this function is undefined.
  84  *
  85  * Return value: None.
  86  */
  87 void strmap_delete(StrMap *map);
  88
  89 /*
  90  * Returns the value associated with the supplied key.
  91  *
  92  * Parameters:
  93  *
  94  * map: A pointer to a string map. This parameter cannot be null.
  95  *
  96  * key: A pointer to a null-terminated C string. This parameter cannot
  97  * be null.
  98  *
  99  * out_buf: A pointer to an output buffer which will contain the value,
 100  * if it exists and fits into the buffer.
 101  *
 102  * n_out_buf: The size of the output buffer in bytes.
 103  *
 104  * Return value: If out_buf is set to null and n_out_buf is set to 0 the return
 105  * value will be the number of bytes required to store the value (if it exists)
 106  * and its null-terminator. For all other parameter configurations the return value
 107  * is 1 if an associated value was found and completely copied into the output buffer,
 108  * 0 otherwise.
 109  */
 110 int strmap_get(const StrMap *map, const char *key, char *out_buf, unsigned int n_out_buf);
 111
 112 /*
 113  * Queries the existence of a key.
 114  *
 115  * Parameters:
 116  *
 117  * map: A pointer to a string map. This parameter cannot be null.
 118  *
 119  * key: A pointer to a null-terminated C string. This parameter cannot
 120  * be null.
 121  *
 122  * Return value: 1 if the key exists, 0 otherwise.
 123  */
 124 int strmap_exists(const StrMap *map, const char *key);
 125
 126 /*
 127  * Associates a value with the supplied key. If the key is already
 128  * associated with a value, the previous value is replaced.
 129  *
 130  * Parameters:
 131  *
 132  * map: A pointer to a string map. This parameter cannot be null.
 133  *
 134  * key: A pointer to a null-terminated C string. This parameter
 135  * cannot be null. The string must have a string length > 0. The
 136  * string will be copied.
 137  *
 138  * value: A pointer to a null-terminated C string. This parameter
 139  * cannot be null. The string must have a string length > 0. The
 140  * string will be copied.
 141  *
 142  * Return value: 1 if the association succeeded, 0 otherwise.
 143  */
 144 int strmap_put(StrMap *map, const char *key, const char *value);
 145
 146 /*
 147  * Returns the number of associations between keys and values.
 148  *
 149  * Parameters:
 150  *
 151  * map: A pointer to a string map. This parameter cannot be null.
 152  *
 153  * Return value: The number of associations between keys and values.
 154  */
 155 int strmap_get_count(const StrMap *map);
 156
 157 /*
 158  * Enumerates all associations between keys and values.
 159  *
 160  * Parameters:
 161  *
 162  * map: A pointer to a string map. This parameter cannot be null.
 163  *
 164  * enum_func: A pointer to a callback function that will be
 165  * called by this procedure once for every key associated
 166  * with a value. This parameter cannot be null.
 167  *
 168  * obj: A pointer to a client-specific object. This parameter will be
 169  * passed back to the client's callback function. This parameter can
 170  * be null.
 171  *
 172  * Return value: 1 if enumeration completed, 0 otherwise.
 173  */
 174 int strmap_enum(const StrMap *map, strmap_enum_func enum_func, const void *obj);
 175
 176 #ifdef __cplusplus
 177 }
 178 #endif
 179
 180 #endif
 181
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