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3666 | mejdrech | 1 | /* |
3912 | mejdrech | 2 | * Copyright (c) 2009 Lukas Mejdrech |
3666 | mejdrech | 3 | * All rights reserved. |
4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup net |
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3912 | mejdrech | 30 | * @{ |
3666 | mejdrech | 31 | */ |
32 | |||
3912 | mejdrech | 33 | /** @file |
4704 | mejdrech | 34 | * Generic type field. |
3666 | mejdrech | 35 | */ |
36 | |||
37 | #ifndef __GENERIC_FIELD_H__ |
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38 | #define __GENERIC_FIELD_H__ |
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39 | |||
40 | #include <errno.h> |
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41 | #include <malloc.h> |
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4192 | mejdrech | 42 | #include <mem.h> |
3666 | mejdrech | 43 | #include <unistd.h> |
44 | |||
4704 | mejdrech | 45 | /** Internal magic value for a field consistency check. |
46 | */ |
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3666 | mejdrech | 47 | #define GENERIC_FIELD_MAGIC_VALUE 0x55667788 |
48 | |||
4704 | mejdrech | 49 | /** Generic type field declaration. |
50 | * @param name Name of the field. Input parameter. |
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51 | * @param type Inner object type. Input parameter |
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52 | */ |
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3666 | mejdrech | 53 | #define GENERIC_FIELD_DECLARE( name, type ) \ |
54 | \ |
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55 | typedef struct name name##_t; \ |
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56 | typedef name##_t * name##_ref; \ |
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57 | \ |
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58 | struct name{ \ |
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4743 | mejdrech | 59 | int size; \ |
3666 | mejdrech | 60 | int next; \ |
61 | type ** items; \ |
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62 | int magic; \ |
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63 | }; \ |
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64 | \ |
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65 | int name##_add( name##_ref field, type * value ); \ |
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66 | int name##_count( name##_ref field ); \ |
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67 | void name##_destroy( name##_ref field ); \ |
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68 | void name##_exclude_index( name##_ref field, int index ); \ |
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69 | type ** name##_get_field( name##_ref field ); \ |
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70 | type * name##_get_index( name##_ref field, int index ); \ |
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71 | int name##_initialize( name##_ref field ); \ |
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72 | int name##_is_valid( name##_ref field ); |
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73 | |||
4704 | mejdrech | 74 | /** Generic type field implementation. |
75 | * Should follow declaration with the same parameters. |
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76 | * @param name Name of the field. Input parameter. |
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77 | * @param type Inner object type. Input parameter |
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78 | */ |
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3666 | mejdrech | 79 | #define GENERIC_FIELD_IMPLEMENT( name, type ) \ |
80 | \ |
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81 | int name##_add( name##_ref field, type * value ){ \ |
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82 | if( name##_is_valid( field )){ \ |
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83 | if( field->next == ( field->size - 1 )){ \ |
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84 | type ** tmp; \ |
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85 | \ |
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4197 | mejdrech | 86 | tmp = ( type ** ) realloc( field->items, sizeof( type * ) * 2 * field->size ); \ |
3666 | mejdrech | 87 | if( ! tmp ) return ENOMEM; \ |
88 | field->size *= 2; \ |
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89 | field->items = tmp; \ |
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90 | } \ |
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91 | field->items[ field->next ] = value; \ |
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92 | ++ field->next; \ |
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93 | field->items[ field->next ] = NULL; \ |
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94 | return field->next - 1; \ |
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95 | } \ |
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96 | return EINVAL; \ |
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97 | } \ |
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98 | \ |
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99 | int name##_count( name##_ref field ){ \ |
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100 | return name##_is_valid( field ) ? field->next : -1; \ |
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101 | } \ |
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102 | \ |
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103 | void name##_destroy( name##_ref field ){ \ |
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104 | if( name##_is_valid( field )){ \ |
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105 | int index; \ |
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106 | \ |
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107 | field->magic = 0; \ |
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108 | for( index = 0; index < field->next; ++ index ){ \ |
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109 | free( field->items[ index ] ); \ |
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110 | } \ |
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111 | free( field->items ); \ |
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112 | } \ |
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113 | } \ |
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114 | \ |
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115 | void name##_exclude_index( name##_ref field, int index ){ \ |
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116 | if( name##_is_valid( field ) && ( index >= 0 ) && ( index < field->next ) && ( field->items[ index ] )){ \ |
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117 | free( field->items[ index ] ); \ |
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118 | field->items[ index ] = NULL; \ |
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119 | } \ |
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120 | } \ |
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121 | \ |
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122 | type * name##_get_index( name##_ref field, int index ){ \ |
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123 | if( name##_is_valid( field ) && ( index >= 0 ) && ( index < field->next ) && ( field->items[ index ] )){ \ |
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124 | return field->items[ index ]; \ |
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125 | } \ |
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126 | return NULL; \ |
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127 | } \ |
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128 | \ |
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129 | type ** name##_get_field( name##_ref field ){ \ |
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130 | return name##_is_valid( field ) ? field->items : NULL; \ |
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131 | } \ |
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132 | \ |
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133 | int name##_initialize( name##_ref field ){ \ |
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134 | if( ! field ) return EINVAL; \ |
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135 | field->size = 2; \ |
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136 | field->next = 0; \ |
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137 | field->items = ( type ** ) malloc( sizeof( type * ) * field->size ); \ |
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138 | if( ! field->items ) return ENOMEM; \ |
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139 | field->items[ field->next ] = NULL; \ |
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3901 | mejdrech | 140 | field->magic = GENERIC_FIELD_MAGIC_VALUE; \ |
3666 | mejdrech | 141 | return EOK; \ |
142 | } \ |
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143 | \ |
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144 | int name##_is_valid( name##_ref field ){ \ |
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3901 | mejdrech | 145 | return field && ( field->magic == GENERIC_FIELD_MAGIC_VALUE ); \ |
3666 | mejdrech | 146 | } |
147 | |||
148 | #endif |
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149 | |||
150 | /** @} |
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151 | */ |
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152 |