Diff: libs/ConfigSources/FileConfigSource.cpp

Revision:

0:31e91bb0ef3c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libs/ConfigSources/FileConfigSource.cpp	Tue Jul 31 21:11:18 2012 +0000
@@ -0,0 +1,177 @@
+/*  
+      This file is part of Smoothie (http://smoothieware.org/). The motion control part is heavily based on Grbl (https://github.com/simen/grbl).
+      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.
+      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.
+      You should have received a copy of the GNU General Public License along with Smoothie. If not, see <http://www.gnu.org/licenses/>. 
+*/
+
+#include "libs/Kernel.h"
+#include "ConfigValue.h"
+#include "FileConfigSource.h"
+#include "ConfigCache.h"
+using namespace std;
+#include <string>
+
+FileConfigSource::FileConfigSource(string config_file, uint16_t name_checksum){
+    this->name_checksum = name_checksum;
+    this->config_file = config_file;
+    this->config_file_found = false;
+}
+
+// Transfer all values found in the file to the passed cache
+void FileConfigSource::transfer_values_to_cache( ConfigCache* cache ){
+    // Default empty value
+    ConfigValue* result = new ConfigValue;
+    if( this->has_config_file() == false ){
+        return;
+    }
+    // Open the config file ( find it if we haven't already found it ) 
+    FILE *lp = fopen(this->get_config_file().c_str(), "r");
+    string buffer;
+    int c; 
+    // For each line 
+    do {
+        c = fgetc (lp);
+        if (c == '\n' || c == EOF){
+            // We have a new line
+            if( buffer[0] == '#' ){ buffer.clear(); continue; } // Ignore comments
+            if( buffer.length() < 3 ){ buffer.clear(); continue; } //Ignore empty lines
+            size_t begin_key = buffer.find_first_not_of(" ");
+            size_t begin_value = buffer.find_first_not_of(" ", buffer.find_first_of(" ", begin_key));
+            string key = buffer.substr(begin_key,  buffer.find_first_of(" ", begin_key) - begin_key).append(" ");
+            vector<uint16_t> check_sums = get_checksums(key);
+
+            result = new ConfigValue;
+            result->found = true;
+            result->check_sums = check_sums;
+            result->value = buffer.substr(begin_value, buffer.find_first_of("\r\n# ", begin_value+1)-begin_value);
+            
+            // Append the newly found value to the cache we were passed 
+            cache->replace_or_push_back(result);
+            
+            buffer.clear();
+        }else{
+            buffer += c;
+        }
+    } while (c != EOF);  
+    fclose(lp);
+
+}
+
+// Return true if the check_sums match
+bool FileConfigSource::is_named( uint16_t check_sum ){
+    return check_sum == this->name_checksum;
+}
+
+// Write a config setting to the file
+void FileConfigSource::write( string setting, string value ){
+/*
+    // Open the config file ( find it if we haven't already found it )
+    FILE *lp = fopen(this->get_config_file().c_str(), "r+");
+    string buffer;
+    int c;
+    // For each line
+    do {
+        c = fgetc (lp);
+        if (c == '\n' || c == EOF){
+            // We have a new line
+            if( buffer[0] == '#' ){ buffer.clear(); continue; } // Ignore comments
+            if( buffer.length() < 3 ){ buffer.clear(); continue; } //Ignore empty lines
+            size_t begin_key = buffer.find_first_not_of(" ");
+            size_t begin_value = buffer.find_first_not_of(" ", buffer.find_first_of(" ", begin_key));
+            // If this line matches the checksum
+            string candidate = buffer.substr(begin_key,  buffer.find_first_of(" ", begin_key) - begin_key);
+            if( candidate.compare(setting) != 0 ){ buffer.clear(); continue; }
+            int free_space = int(int(buffer.find_first_of("\r\n#", begin_value+1))-begin_value);
+            if( int(value.length()) >= free_space ){
+                //this->kernel->serial->printf("ERROR: Not enough room for value\r\n");
+                fclose(lp);
+                return;
+            }
+            // Update value
+            for( int i = value.length(); i < free_space; i++){ value += " "; }
+            fpos_t pos;
+            fgetpos( lp, &pos );
+            int start = pos - buffer.length() + begin_value - 1;
+            fseek(lp, start, SEEK_SET);
+            fputs(value.c_str(), lp);
+            fclose(lp);
+            return;
+        }else{
+            buffer += c;
+        }
+    } while (c != EOF);
+    fclose(lp);
+    //this->kernel->serial->printf("ERROR: configuration key not found\r\n");
+    */
+}
+
+// Return the value for a specific checksum
+string FileConfigSource::read( vector<uint16_t> check_sums ){
+
+    string value = "";
+
+    if( this->has_config_file() == false ){return value;}
+    // Open the config file ( find it if we haven't already found it ) 
+    FILE *lp = fopen(this->get_config_file().c_str(), "r");
+    string buffer;
+    int c; 
+    // For each line 
+    do {
+        c = fgetc (lp);
+        if (c == '\n' || c == EOF){
+            // We have a new line
+            if( buffer[0] == '#' ){ buffer.clear(); continue; } // Ignore comments
+            if( buffer.length() < 3 ){ buffer.clear(); continue; } //Ignore empty lines
+            size_t begin_key = buffer.find_first_not_of(" ");
+            size_t begin_value = buffer.find_first_not_of(" ", buffer.find_first_of(" ", begin_key));
+            string key = buffer.substr(begin_key,  buffer.find_first_of(" ", begin_key) - begin_key).append(" ");
+            vector<uint16_t> line_checksums = get_checksums(key);
+
+            if(check_sums == line_checksums){
+                value = buffer.substr(begin_value, buffer.find_first_of("\r\n# ", begin_value+1)-begin_value);
+                break;
+            }
+            
+            buffer.clear();
+        }else{
+            buffer += c;
+        }
+    } while (c != EOF);  
+    fclose(lp);
+
+    return value;
+}
+
+// Return wether or not we have a readable config file
+bool FileConfigSource::has_config_file(){
+    if( this->config_file_found ){ return true; }
+    this->try_config_file(this->config_file);
+    if( this->config_file_found ){
+        return true;
+    }else{
+        return false;
+    }
+
+}
+
+// Tool function for get_config_file
+inline void FileConfigSource::try_config_file(string candidate){
+    if(file_exists(candidate)){ 
+        this->config_file_found = true; 
+    }
+}
+
+// Get the filename for the config file
+string FileConfigSource::get_config_file(){
+    if( this->config_file_found ){ return this->config_file; }
+    if( this->has_config_file() ){
+        return this->config_file;
+    }else{
+        printf("ERROR: no config file found\r\n");
+    }
+}
+
+
+
+