Laser cutter software
Dependencies: EthernetNetIf mbed SDFileSystem
Diff: ConfigFile/ConfigFile.cpp
- Revision:
- 0:18ead85c200b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ConfigFile/ConfigFile.cpp Thu Aug 11 09:33:15 2011 +0000 @@ -0,0 +1,130 @@ +/* + * ConfigFile.cpp + * Simple Config file reader class + * + * Copyright (c) 2011 Peter Brier + * + * This file is part of the LaOS project (see: http://wiki.protospace.nl/index.php/LaOS) + * + * LaOS 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. + * + * LaOS 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 LaOS. If not, see <http://www.gnu.org/licenses/>. + * + */ +#include "ConfigFile.h" + +// Make new config file object +ConfigFile::ConfigFile(char *file) +{ + // printf("ConfigFile(%s)\n\r", file); + fp = fopen(file,"rb"); +} + +// Destroy a config file (closes the file handle) +ConfigFile::~ConfigFile() +{ + // printf("~ConfigFile()\n\r"); + if ( fp != NULL ) + fclose(fp); +} + +// Read value +bool ConfigFile::Value(char *key, char *value, size_t maxlen, char *def) +{ + int m=0,n=0,c,s=0; + if (fp == NULL) + { + strncpy(value, def, maxlen); + return false; + } + // printf("Value()\n\r"); + n = strlen(key); + fseek(fp, 0L, SEEK_SET); + while( s != 99 ) + { + c = fgetc(fp); + if ( c == EOF ) + break; + // printf("%d: '%c'\n\r", s, c); + switch( s )// sate machine + { + case 0: // (re) start: note: no break; fall through to case 1 + m=0; + s=1; + case 1: // read key, skip spaces + if ( c == key[m] ) + m++; + else + s = 0; + if ( c == ';' ) + s = 10; + else if ( c == ' ' || c == '\t' || c == '\n' || c == '\r') + { + if ( n == m ) // key found + { + s = 2; + m = 0; + } + else + s = 0; + } + break; + case 2: // key matched, skip whitepaces upto the first char + if ( c == ';' ) s = 99; + else if ( c != ' ' && c != '\t' ) + { + s = 3; + m = 1; + if ( m < maxlen) + *value++ = c; + } + break; + + case 3: // copy value content, upto eol or comment + if ( m == maxlen || c == '\n' || c == '\r' || c == ';' ) + s = 99; + else + { + m++; + *value++ = c; + } + break; + case 10: // skip comments, upto eol or eof + if ( c == '\n' || c == '\r' ) s = 0; + break; + } + } + if ( s == 99 && m > 1) // key found, and value assigned + { + *value = 0; // terminate string + return true; + } + else + { + strncpy(value, def, maxlen); + return false; + } +} + +// Read int value +bool ConfigFile::Value(char *key, int *value, int def) +{ + char val[16]; + bool b = Value(key, val, 12, ""); + if ( b ) + *value = atoi(val); + else + { + *value = def; + } + return b; +}