1 | #include <fstream.hfa> |
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2 | #include <heap.hfa> |
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3 | #include "parseconfig.hfa" |
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4 | |
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5 | struct KVPairs { |
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6 | int size, max_size; |
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7 | * [ char *, char * ] data; |
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8 | }; |
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9 | void ?{}( VLA & vla ) with ( vla ) { // default constructor |
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10 | size = 0; max_size = 0; data = 0p; |
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11 | } |
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12 | void ?{}( VLA & vla, int size, char fill = ['\0', '\0'] ) { // initialization |
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13 | vla.[ size, max_size, data ] = [ 0, max_size, alloc( size, fill ) ]; |
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14 | } |
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15 | void ?{}( VLA & vla, VLA val ) with( val ) { // copy, deep |
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16 | vla.[ size, max_size, data ] = [ size, max_size, alloc( size, data ) ]; |
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17 | } |
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18 | void ^?{}( VLA & vla ) with ( vla ) { // destructor |
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19 | free( data ); |
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20 | size = 0; max_size = 0; data = 0p; |
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21 | } |
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22 | |
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23 | void add_kv_pair( KVPairs kv_pairs, char * k, char * v ) with( kv_pairs ) { |
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24 | if ( size == max_size ) { |
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25 | max_size = max_size * 2; |
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26 | data = resize( data, max_size ); |
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27 | } |
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28 | |
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29 | data[size] = [ k, v ]; |
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30 | ++size; |
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31 | } |
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32 | |
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33 | bool comments( ifstream & in, char * name ) { |
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34 | while () { |
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35 | in | name; |
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36 | if ( fail( in ) ) return true; |
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37 | if ( name[0] != '#' ) break; |
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38 | in | nl; // ignore remainder of line |
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39 | } // for |
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40 | return false; |
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41 | } // comments |
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42 | |
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43 | // Process the configuration file to set the simulation parameters. |
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44 | void parse_config( const char * config_file, config_entry entries[], size_t num_entries ) { |
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45 | KVPairs kv_pairs{ num_entries }; |
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46 | |
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47 | ifstream in; |
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48 | try { |
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49 | open( in, config_file ); // open the configuration file for input |
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50 | |
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51 | while () { |
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52 | char * key; |
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53 | char * value; |
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54 | if ( comments( in, key ) ) break; // eof ? |
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55 | // Should we just overwrite duplicate config entries? Having a hash map would make this much easier |
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56 | in | value; |
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57 | |
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58 | add_kv_pair( kv_pairs, key, value ); |
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59 | |
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60 | if ( fail( in ) ) break; |
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61 | in | nl; // ignore remainder of line |
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62 | } // for |
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63 | } catch( Open_Failure * ex; ex->istream == &in ) { |
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64 | exit | "Error: could not open input file \"" | config_file | "\""; |
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65 | } // try |
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66 | close( in ); |
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67 | // *** WE MUST ALLOW SOME SORT OF VALIDATION FUNCTIONALITY TOO!!! *** |
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68 | |
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69 | int entries_so_far = 0; |
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70 | for ( i; kv_pairs.size ) { |
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71 | if ( entries_so_far == num_entries ) break; |
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72 | |
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73 | char * src_key, * src_value; |
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74 | [ src_key, src_value ] = kv_pairs.data[i]; |
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75 | |
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76 | for ( j; num_entries ) { |
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77 | if ( strcmp( src_key, entries[j].key ) != 0 ) continue; |
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78 | if ( entries[j].parse( src_value, entries[j].variable ) ) { |
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79 | ++entries_so_far; |
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80 | break; |
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81 | } |
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82 | |
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83 | serr | "Value " | src_value | " for key " | dest_key | " could not be parsed"; |
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84 | } |
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85 | } |
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86 | } // processConfigFile |
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87 | |
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88 | |
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89 | //----------------------------------------------------------------------------- |
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90 | // Typed argument parsing |
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91 | |
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92 | bool parse( const char * arg, const char * & value ) { |
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93 | value = arg; |
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94 | return true; |
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95 | } |
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96 | |
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97 | bool parse( const char * arg, int & value ) { |
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98 | char * end; |
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99 | int r = strtoll( arg, &end, 10 ); |
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100 | if ( *end != '\0' ) return false; |
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101 | |
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102 | value = r; |
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103 | return true; |
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104 | } |
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105 | |
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106 | bool parse( const char * arg, unsigned & value ) { |
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107 | char * end; |
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108 | unsigned long long int r = strtoull( arg, &end, 10 ); |
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109 | if ( *end != '\0' ) return false; |
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110 | if ( r > (unsigned)MAX ) return false; |
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111 | |
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112 | value = r; |
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113 | return true; |
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114 | } |
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115 | |
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116 | bool parse( const char * arg, unsigned long & value ) { |
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117 | char * end; |
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118 | unsigned long long int r = strtoull( arg, &end, 10 ); |
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119 | if ( *end != '\0' ) return false; |
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120 | if ( r > (unsigned long)MAX ) return false; |
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121 | |
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122 | value = r; |
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123 | return true; |
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124 | } |
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125 | |
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126 | bool parse( const char * arg, unsigned long long & value ) { |
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127 | char * end; |
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128 | unsigned long long int r = strtoull( arg, &end, 10 ); |
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129 | if ( *end != '\0' ) return false; |
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130 | if ( r > (unsigned long long)MAX ) return false; |
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131 | |
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132 | value = r; |
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133 | return true; |
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134 | } |
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135 | |
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136 | bool parse( const char * arg, float & value ) { |
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137 | char * end; |
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138 | float r = strtof( arg, &end ); |
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139 | if ( *end != '\0' ) return false; |
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140 | |
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141 | value = r; |
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142 | return true; |
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143 | } |
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144 | |
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145 | bool parse( const char * arg, double & value ) { |
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146 | char * end; |
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147 | double r = strtod( arg, &end ); |
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148 | if ( *end != '\0' ) return false; |
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149 | |
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150 | value = r; |
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151 | return true; |
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152 | } |
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153 | |
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154 | |
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155 | // Local Variables: // |
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156 | // tab-width: 4 // |
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157 | // compile-command: "cfa parseconfig.cfa" // |
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158 | // End: // |
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