[1896c1f] | 1 | #include <fstream.hfa> |
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[8f01cb04] | 2 | #include <parseargs.hfa> |
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[16f9aca] | 3 | #include "parseconfig.hfa" |
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| 4 | |
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[80ae121] | 5 | |
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| 6 | // *********************************** exceptions *********************************** |
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| 7 | |
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| 8 | |
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| 9 | EHM_VIRTUAL_TABLE(Validation_Failure, Validation_Failure_main_table); |
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| 10 | void ?{}( Validation_Failure & this, config_entry & entry ) with ( entry ) { |
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| 11 | this.virtual_table = &Validation_Failure_main_table; |
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| 12 | this.key = key; |
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| 13 | this.variable = variable; |
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| 14 | } |
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| 15 | void throwValidation_Failure( config_entry & entry ) { |
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| 16 | Validation_Failure exc = { entry }; |
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| 17 | } |
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| 18 | |
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| 19 | |
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| 20 | // *********************************** main code *********************************** |
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| 21 | |
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| 22 | |
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[5e0e488] | 23 | struct KVPairs { |
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| 24 | int size, max_size; |
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| 25 | * [ char *, char * ] data; |
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| 26 | }; |
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[58ebd78] | 27 | void ?{}( KVPairs & kvp ) with ( kvp ) { // default constructor |
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[5e0e488] | 28 | size = 0; max_size = 0; data = 0p; |
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| 29 | } |
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[58ebd78] | 30 | void ?{}( KVPairs & kvp, int size ) { // initialization |
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| 31 | kvp.[ size, max_size ] = [ 0, size ]; |
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| 32 | kvp.data = alloc( size ); |
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[5e0e488] | 33 | } |
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[58ebd78] | 34 | void ^?{}( KVPairs & kvp ) with ( kvp ) { // destructor |
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[5e0e488] | 35 | free( data ); |
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| 36 | size = 0; max_size = 0; data = 0p; |
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| 37 | } |
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| 38 | |
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[58ebd78] | 39 | void add_kv_pair( KVPairs kv_pairs, char * k, char * v ) with ( kv_pairs ) { |
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[5e0e488] | 40 | if ( size == max_size ) { |
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[58ebd78] | 41 | max_size *= 2; |
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[5e0e488] | 42 | data = resize( data, max_size ); |
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| 43 | } |
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| 44 | |
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| 45 | data[size] = [ k, v ]; |
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| 46 | ++size; |
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| 47 | } |
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| 48 | |
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[2c2d32b] | 49 | bool comments( ifstream & in, char * name ) { |
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[181ef73] | 50 | while () { |
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[1896c1f] | 51 | in | name; |
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| 52 | if ( fail( in ) ) return true; |
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[2c2d32b] | 53 | if ( name[0] != '#' ) break; |
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[1896c1f] | 54 | in | nl; // ignore remainder of line |
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[16f9aca] | 55 | } // for |
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| 56 | return false; |
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| 57 | } // comments |
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| 58 | |
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[33800ac8] | 59 | // Parse configuration from a file formatted in shell style |
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[58ebd78] | 60 | KVPairs & parse_shell_config_format( const char * config_file, size_t num_entries ) { |
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| 61 | KVPairs kv_pairs = { num_entries }; |
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[5e0e488] | 62 | |
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[4df8fef5] | 63 | ifstream in; |
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[c2016b6] | 64 | try { |
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[4df8fef5] | 65 | open( in, config_file ); // open the configuration file for input |
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[16f9aca] | 66 | |
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[ff3be413] | 67 | while () { |
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[4df8fef5] | 68 | char * key; |
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| 69 | char * value; |
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| 70 | if ( comments( in, key ) ) break; // eof ? |
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[ff3be413] | 71 | // Should we just overwrite duplicate config entries? Having a hash map would make this much easier |
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[1896c1f] | 72 | in | value; |
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[d5cfc7e] | 73 | |
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| 74 | add_kv_pair( kv_pairs, key, value ); |
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| 75 | |
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[1896c1f] | 76 | if ( fail( in ) ) break; |
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| 77 | in | nl; // ignore remainder of line |
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[16f9aca] | 78 | } // for |
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[1896c1f] | 79 | } catch( Open_Failure * ex; ex->istream == &in ) { |
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[4df8fef5] | 80 | exit | "Error: could not open input file \"" | config_file | "\""; |
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[16f9aca] | 81 | } // try |
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[ff3be413] | 82 | close( in ); |
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[e7e5b81] | 83 | |
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[33800ac8] | 84 | return kv_pairs; |
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| 85 | } |
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| 86 | |
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[58ebd78] | 87 | // Parse configuration values from intermediate format |
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[33800ac8] | 88 | void parse_config( const char * config_file, config_entry entries[], size_t num_entries ) { |
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[58ebd78] | 89 | KVPairs kv_pairs = parse_shell_config_format( config_file, num_entries ); |
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[33800ac8] | 90 | |
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[e7e5b81] | 91 | int entries_so_far = 0; |
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| 92 | for ( i; kv_pairs.size ) { |
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| 93 | if ( entries_so_far == num_entries ) break; |
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| 94 | |
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| 95 | char * src_key, * src_value; |
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| 96 | [ src_key, src_value ] = kv_pairs.data[i]; |
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| 97 | |
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| 98 | for ( j; num_entries ) { |
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| 99 | if ( strcmp( src_key, entries[j].key ) != 0 ) continue; |
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| 100 | if ( entries[j].parse( src_value, entries[j].variable ) ) { |
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| 101 | ++entries_so_far; |
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[6604ea1] | 102 | |
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| 103 | // Validate the parsed data, if necessary |
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| 104 | if ( entries[j].validate != 0p ) { |
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| 105 | if ( !entries[j].validate( entries[j].variable ) ) throwValidation_Failure( entries[j] ); |
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| 106 | } |
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| 107 | |
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[e7e5b81] | 108 | break; |
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| 109 | } |
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| 110 | |
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[58ebd78] | 111 | serr | "Value '" | src_value | "' for key '" | src_key | "' could not be parsed"; |
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[e7e5b81] | 112 | } |
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| 113 | } |
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[16f9aca] | 114 | } // processConfigFile |
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| 115 | |
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[e7e5b81] | 116 | |
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[930609e2] | 117 | // *********************************** validation *********************************** |
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| 118 | |
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| 119 | |
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| 120 | forall(T | arithmetic( T )) |
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| 121 | bool is_nonnegative( T & value ) { |
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| 122 | T zero_val = 0; |
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| 123 | return value >= zero_val; |
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| 124 | } |
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| 125 | |
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| 126 | forall(T | arithmetic( T )) |
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| 127 | bool is_positive( T & value ) { |
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| 128 | T zero_val = 0; |
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| 129 | return value > zero_val; |
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| 130 | } |
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| 131 | |
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| 132 | forall(T | arithmetic( T )) |
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| 133 | bool is_nonpositive( T & value ) { |
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| 134 | T zero_val = 0; |
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| 135 | return value <= zero_val; |
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| 136 | } |
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| 137 | |
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| 138 | forall(T | arithmetic( T )) |
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| 139 | bool is_negative( T & value ) { |
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| 140 | T zero_val = 0; |
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| 141 | return value < zero_val; |
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| 142 | } |
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| 143 | |
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| 144 | |
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[16f9aca] | 145 | // Local Variables: // |
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| 146 | // tab-width: 4 // |
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| 147 | // compile-command: "cfa parseconfig.cfa" // |
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| 148 | // End: // |
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