[1896c1f] | 1 | #include <fstream.hfa> |
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[8f01cb04] | 2 | #include <parseargs.hfa> |
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[716e4e6] | 3 | #include <stdlib.hfa> |
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| 4 | #include <string.h> |
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[16f9aca] | 5 | #include "parseconfig.hfa" |
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| 6 | |
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[80ae121] | 7 | |
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| 8 | // *********************************** exceptions *********************************** |
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| 9 | |
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| 10 | |
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| 11 | EHM_VIRTUAL_TABLE(Validation_Failure, Validation_Failure_main_table); |
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| 12 | void ?{}( Validation_Failure & this, config_entry & entry ) with ( entry ) { |
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| 13 | this.virtual_table = &Validation_Failure_main_table; |
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| 14 | this.key = key; |
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| 15 | this.variable = variable; |
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| 16 | } |
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| 17 | void throwValidation_Failure( config_entry & entry ) { |
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| 18 | Validation_Failure exc = { entry }; |
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| 19 | } |
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| 20 | |
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| 21 | |
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| 22 | // *********************************** main code *********************************** |
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| 23 | |
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| 24 | |
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[5e0e488] | 25 | struct KVPairs { |
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| 26 | int size, max_size; |
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| 27 | * [ char *, char * ] data; |
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| 28 | }; |
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[e74ba77] | 29 | void ?{}( KVPairs & kvp ) with ( kvp ) { // default constructor |
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[5e0e488] | 30 | size = 0; max_size = 0; data = 0p; |
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| 31 | } |
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[e74ba77] | 32 | void ?{}( KVPairs & kvp, int size ) { // initialization |
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[58ebd78] | 33 | kvp.[ size, max_size ] = [ 0, size ]; |
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| 34 | kvp.data = alloc( size ); |
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[5e0e488] | 35 | } |
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[e74ba77] | 36 | /* |
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| 37 | void ?{}( KVPairs & kvp, KVPairs val ) with( val ) { // copy, deep |
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| 38 | kvp.[ size, max_size ] = [ size, max_size ]; |
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| 39 | kvp.data = alloc( size, data ); |
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| 40 | } |
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| 41 | */ |
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| 42 | void ^?{}( KVPairs & kvp ) with ( kvp ) { // destructor |
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[5e0e488] | 43 | free( data ); |
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| 44 | size = 0; max_size = 0; data = 0p; |
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| 45 | } |
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| 46 | |
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[58ebd78] | 47 | void add_kv_pair( KVPairs kv_pairs, char * k, char * v ) with ( kv_pairs ) { |
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[5e0e488] | 48 | if ( size == max_size ) { |
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[58ebd78] | 49 | max_size *= 2; |
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[5e0e488] | 50 | data = resize( data, max_size ); |
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| 51 | } |
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| 52 | |
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| 53 | data[size] = [ k, v ]; |
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| 54 | ++size; |
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| 55 | } |
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| 56 | |
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[2c2d32b] | 57 | bool comments( ifstream & in, char * name ) { |
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[181ef73] | 58 | while () { |
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[1896c1f] | 59 | in | name; |
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| 60 | if ( fail( in ) ) return true; |
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[2c2d32b] | 61 | if ( name[0] != '#' ) break; |
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[1896c1f] | 62 | in | nl; // ignore remainder of line |
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[16f9aca] | 63 | } // for |
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| 64 | return false; |
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| 65 | } // comments |
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| 66 | |
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[33800ac8] | 67 | // Parse configuration from a file formatted in shell style |
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[58ebd78] | 68 | KVPairs & parse_shell_config_format( const char * config_file, size_t num_entries ) { |
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[e74ba77] | 69 | * KVPairs kv_pairs;// = { num_entries }; |
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[5e0e488] | 70 | |
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[4df8fef5] | 71 | ifstream in; |
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[c2016b6] | 72 | try { |
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[4df8fef5] | 73 | open( in, config_file ); // open the configuration file for input |
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[16f9aca] | 74 | |
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[ff3be413] | 75 | while () { |
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[4df8fef5] | 76 | char * key; |
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| 77 | char * value; |
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| 78 | if ( comments( in, key ) ) break; // eof ? |
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[ff3be413] | 79 | // Should we just overwrite duplicate config entries? Having a hash map would make this much easier |
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[1896c1f] | 80 | in | value; |
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[d5cfc7e] | 81 | |
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[e74ba77] | 82 | add_kv_pair( *kv_pairs, key, value ); |
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[d5cfc7e] | 83 | |
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[1896c1f] | 84 | if ( fail( in ) ) break; |
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| 85 | in | nl; // ignore remainder of line |
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[16f9aca] | 86 | } // for |
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[1896c1f] | 87 | } catch( Open_Failure * ex; ex->istream == &in ) { |
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[4df8fef5] | 88 | exit | "Error: could not open input file \"" | config_file | "\""; |
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[16f9aca] | 89 | } // try |
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[ff3be413] | 90 | close( in ); |
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[e7e5b81] | 91 | |
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[e74ba77] | 92 | return *kv_pairs; |
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[33800ac8] | 93 | } |
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| 94 | |
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[58ebd78] | 95 | // Parse configuration values from intermediate format |
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[33800ac8] | 96 | void parse_config( const char * config_file, config_entry entries[], size_t num_entries ) { |
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[58ebd78] | 97 | KVPairs kv_pairs = parse_shell_config_format( config_file, num_entries ); |
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[33800ac8] | 98 | |
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[e7e5b81] | 99 | int entries_so_far = 0; |
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| 100 | for ( i; kv_pairs.size ) { |
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| 101 | if ( entries_so_far == num_entries ) break; |
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| 102 | |
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| 103 | char * src_key, * src_value; |
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| 104 | [ src_key, src_value ] = kv_pairs.data[i]; |
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| 105 | |
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| 106 | for ( j; num_entries ) { |
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| 107 | if ( strcmp( src_key, entries[j].key ) != 0 ) continue; |
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| 108 | if ( entries[j].parse( src_value, entries[j].variable ) ) { |
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| 109 | ++entries_so_far; |
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[6604ea1] | 110 | |
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| 111 | // Validate the parsed data, if necessary |
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| 112 | if ( entries[j].validate != 0p ) { |
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| 113 | if ( !entries[j].validate( entries[j].variable ) ) throwValidation_Failure( entries[j] ); |
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| 114 | } |
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| 115 | |
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[e7e5b81] | 116 | break; |
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| 117 | } |
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| 118 | |
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[58ebd78] | 119 | serr | "Value '" | src_value | "' for key '" | src_key | "' could not be parsed"; |
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[e7e5b81] | 120 | } |
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| 121 | } |
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[16f9aca] | 122 | } // processConfigFile |
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| 123 | |
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[e7e5b81] | 124 | |
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[930609e2] | 125 | // *********************************** validation *********************************** |
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| 126 | |
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| 127 | |
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[c58c65a] | 128 | forall(T | Relational( T )) |
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[930609e2] | 129 | bool is_nonnegative( T & value ) { |
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| 130 | T zero_val = 0; |
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| 131 | return value >= zero_val; |
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| 132 | } |
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| 133 | |
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[c58c65a] | 134 | forall(T | Relational( T )) |
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[930609e2] | 135 | bool is_positive( T & value ) { |
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| 136 | T zero_val = 0; |
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| 137 | return value > zero_val; |
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| 138 | } |
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| 139 | |
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[c58c65a] | 140 | forall(T | Relational( T )) |
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[930609e2] | 141 | bool is_nonpositive( T & value ) { |
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| 142 | T zero_val = 0; |
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| 143 | return value <= zero_val; |
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| 144 | } |
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| 145 | |
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[c58c65a] | 146 | forall(T | Relational( T )) |
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[930609e2] | 147 | bool is_negative( T & value ) { |
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| 148 | T zero_val = 0; |
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| 149 | return value < zero_val; |
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| 150 | } |
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| 151 | |
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| 152 | |
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[16f9aca] | 153 | // Local Variables: // |
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| 154 | // tab-width: 4 // |
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| 155 | // compile-command: "cfa parseconfig.cfa" // |
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| 156 | // End: // |
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