src/libs/ConfigSources/FileConfigSource.cpp

   1 /*
   2       This file is part of Smoothie (http://smoothieware.org/). The motion control part is heavily based on Grbl (https://github.com/simen/grbl).
   3       Smoothie is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
   4       Smoothie is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
   5       You should have received a copy of the GNU General Public License along with Smoothie. If not, see <http://www.gnu.org/licenses/>.
   6 */
   7
   8 #include "libs/Kernel.h"
   9 #include "ConfigValue.h"
  10 #include "FileConfigSource.h"
  11 #include "ConfigCache.h"
  12 #include <malloc.h>
  13
  14
  15 using namespace std;
  16 #include <string>
  17
  18
  19 FileConfigSource::FileConfigSource(string config_file, uint16_t name_checksum){
  20     this->name_checksum = name_checksum;
  21     this->config_file = config_file;
  22     this->config_file_found = false;
  23 }
  24
  25 // Transfer all values found in the file to the passed cache
  26 void FileConfigSource::transfer_values_to_cache( ConfigCache* cache ){
  27
  28     if( this->has_config_file() == false ){return;}
  29     // Open the config file ( find it if we haven't already found it )
  30     FILE *lp = fopen(this->get_config_file().c_str(), "r");
  31     int c;
  32     // For each line
  33     do {
  34         process_char_from_ascii_config(c = fgetc(lp), cache);
  35     } while (c != EOF);
  36     fclose(lp);
  37 }
  38
  39 // Return true if the check_sums match
  40 bool FileConfigSource::is_named( uint16_t check_sum ){
  41     return check_sum == this->name_checksum;
  42 }
  43
  44 // Write a config setting to the file
  45 void FileConfigSource::write( string setting, string value ){
  46     // Open the config file ( find it if we haven't already found it )
  47     FILE *lp = fopen(this->get_config_file().c_str(), "r+");
  48     string buffer;
  49     int c;
  50     // For each line
  51     do {
  52         c = fgetc (lp);
  53         if (c == '\n' || c == EOF){
  54             // We have a new line
  55             if( buffer[0] == '#' ){ buffer.clear(); continue; } // Ignore comments
  56             if( buffer.length() < 3 ){ buffer.clear(); continue; } //Ignore empty lines
  57             size_t begin_key = buffer.find_first_not_of(" \t");
  58             size_t begin_value = buffer.find_first_not_of(" \t", buffer.find_first_of(" \t", begin_key));
  59             // If this line matches the checksum
  60             string candidate = buffer.substr(begin_key,  buffer.find_first_of(" \t", begin_key) - begin_key);
  61             if( candidate.compare(setting) != 0 ){ buffer.clear(); continue; }
  62             int free_space = int(int(buffer.find_first_of("\r\n#", begin_value+1))-begin_value);
  63             if( int(value.length()) >= free_space ){
  64                 //this->kernel->streams->printf("ERROR: Not enough room for value\r\n");
  65                 fclose(lp);
  66                 return;
  67             }
  68             // Update value
  69             for( int i = value.length(); i < free_space; i++){ value += " "; }
  70             fpos_t pos;
  71             fgetpos( lp, &pos );
  72             int start = pos - buffer.length() + begin_value - 1;
  73             fseek(lp, start, SEEK_SET);
  74             fputs(value.c_str(), lp);
  75             fclose(lp);
  76             return;
  77         }else{
  78             buffer += c;
  79         }
  80     } while (c != EOF);
  81     fclose(lp);
  82     //this->kernel->streams->printf("ERROR: configuration key not found\r\n");
  83 }
  84
  85 // Return the value for a specific checksum
  86 string FileConfigSource::read( uint16_t check_sums[3] ){
  87
  88     string value = "";
  89
  90     if( this->has_config_file() == false ){return value;}
  91     // Open the config file ( find it if we haven't already found it )
  92     FILE *lp = fopen(this->get_config_file().c_str(), "r");
  93     int c;
  94     // For each line
  95     do {
  96         c = fgetc (lp);
  97         process_char_from_ascii_config(c, check_sums);
  98     } while (c != EOF);
  99     fclose(lp);
 100
 101     return value;
 102 }
 103
 104 // Return wether or not we have a readable config file
 105 bool FileConfigSource::has_config_file(){
 106     if( this->config_file_found ){ return true; }
 107     this->try_config_file(this->config_file);
 108     if( this->config_file_found ){
 109         return true;
 110     }else{
 111         return false;
 112     }
 113
 114 }
 115
 116 // Tool function for get_config_file
 117 inline void FileConfigSource::try_config_file(string candidate){
 118     if(file_exists(candidate)){ this->config_file_found = true; }
 119 }
 120
 121 // Get the filename for the config file
 122 string FileConfigSource::get_config_file(){
 123     if( this->config_file_found ){ return this->config_file; }
 124     if( this->has_config_file() ){
 125         return this->config_file;
 126     }else{
 127         printf("ERROR: no config file found\r\n");
 128                 return "";
 129     }
 130 }
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