src/libs/utils.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 "libs/utils.h"
  10 #include "system_LPC17xx.h"
  11 #include "LPC17xx.h"
  12 #include "utils.h"
  13 using namespace std;
  14 #include <string>
  15 using std::string;
  16 #include <cstring>
  17 #include <stdio.h>
  18
  19 volatile bool _isr_context = false;
  20
  21 uint16_t get_checksum(const string& to_check){
  22     return get_checksum(to_check.c_str());
  23 }
  24
  25 uint16_t get_checksum(const char* to_check){
  26    // From: http://en.wikipedia.org/wiki/Fletcher%27s_checksum
  27    uint16_t sum1 = 0;
  28    uint16_t sum2 = 0;
  29    const char* p= to_check;
  30    char c;
  31    while((c= *p++) != 0) {
  32       sum1 = (sum1 + c) % 255;
  33       sum2 = (sum2 + sum1) % 255;
  34    }
  35    return (sum2 << 8) | sum1;
  36 }
  37
  38 void get_checksums(uint16_t check_sums[], const string key){
  39     const string k = key+" ";
  40     check_sums[0] = 0x0000;
  41     check_sums[1] = 0x0000;
  42     check_sums[2] = 0x0000;
  43     size_t begin_key = 0;
  44     unsigned int counter = 0;
  45     while( begin_key < key.size()-1 ){
  46         const size_t end_key =  k.find_first_of(" .", begin_key);
  47         const string key_node = k.substr(begin_key, end_key - begin_key);
  48         check_sums[counter] = get_checksum(key_node);
  49         begin_key = end_key + 1;
  50         counter++;
  51     }
  52 }
  53
  54 bool is_alpha(int c)
  55 {
  56     if ((c >= 'a') && (c <= 'z')) return true;
  57     if ((c >= 'A') && (c <= 'Z')) return true;
  58     if ((c == '_')) return true;
  59     return false;
  60 }
  61
  62 bool is_digit(int c)
  63 {
  64     if ((c >= '0') && (c <= '9')) return true;
  65     return false;
  66 }
  67
  68 bool is_numeric(int c)
  69 {
  70     if (is_digit(c)) return true;
  71     if ((c == '.') || (c == '-')) return true;
  72     if ((c == 'e')) return true;
  73     return false;
  74 }
  75
  76 bool is_alphanum(int c)
  77 {
  78     return is_alpha(c) || is_numeric(c);
  79 }
  80
  81 bool is_whitespace(int c)
  82 {
  83     if ((c == ' ') || (c == '\t')) return true;
  84     return false;
  85 }
  86
  87 // Convert to lowercase
  88 string lc(string str){
  89     for (unsigned int i=0; i<strlen(str.c_str()); i++)
  90         if (str[i] >= 0x41 && str[i] <= 0x5A)
  91         str[i] = str[i] + 0x20;
  92     return str;
  93 }
  94
  95 // Remove non-number characters
  96 string remove_non_number( string str ){
  97     string number_mask = "0123456789-.abcdefpxABCDEFPX";
  98     size_t found=str.find_first_not_of(number_mask);
  99     while (found!=string::npos){
 100         //str[found]='*';
 101         str.replace(found,1,"");
 102         found=str.find_first_not_of(number_mask);
 103     }
 104     return str;
 105 }
 106
 107 // Get the first parameter, and remove it from the original string
 108 string shift_parameter( string &parameters ){
 109     size_t beginning = parameters.find_first_of(" ");
 110     if( beginning == string::npos ){ string temp = parameters; parameters = ""; return temp; }
 111     string temp = parameters.substr( 0, beginning );
 112     parameters = parameters.substr(beginning+1, parameters.size());
 113     return temp;
 114 }
 115
 116 // Separate command from arguments
 117 string get_arguments( string possible_command ){
 118     size_t beginning = possible_command.find_first_of(" ");
 119     if( beginning == string::npos ){ return ""; }
 120     return possible_command.substr( beginning + 1, possible_command.size() - beginning + 1);
 121 }
 122
 123 // Returns true if the file exists
 124 bool file_exists( const string file_name ){
 125     bool exists = false;
 126     FILE *lp = fopen(file_name.c_str(), "r");
 127     if(lp){ exists = true; }
 128     fclose(lp);
 129     return exists;
 130 }
 131
 132 // Prepares and executes a watchdog reset for dfu or reboot
 133 void system_reset( bool dfu ){
 134     if(dfu) {
 135         LPC_WDT->WDCLKSEL = 0x1;                // Set CLK src to PCLK
 136         uint32_t clk = SystemCoreClock / 16;    // WD has a fixed /4 prescaler, PCLK default is /4
 137         LPC_WDT->WDTC = 1 * (float)clk;         // Reset in 1 second
 138         LPC_WDT->WDMOD = 0x3;                   // Enabled and Reset
 139         LPC_WDT->WDFEED = 0xAA;                 // Kick the dog!
 140         LPC_WDT->WDFEED = 0x55;
 141     }else{
 142         NVIC_SystemReset();
 143     }
 144 }
 145
 146 // Convert a path indication ( absolute or relative ) into a path ( absolute )
 147 string absolute_from_relative( string path )
 148 {
 149     string cwd = THEKERNEL->current_path;
 150
 151     if ( path.empty() ) {
 152         return THEKERNEL->current_path;
 153     }
 154
 155     if ( path[0] == '/' ) {
 156         return path;
 157     }
 158
 159     string match = "../" ;
 160     while ( path.substr(0,3) == match ) {
 161         path = path.substr(3);
 162         unsigned found = cwd.find_last_of("/");
 163         cwd = cwd.substr(0,found);
 164     }
 165
 166     match = ".." ;
 167     if ( path.substr(0,2) == match ) {
 168         path = path.substr(2);
 169         unsigned found = cwd.find_last_of("/");
 170         cwd = cwd.substr(0,found);
 171     }
 172
 173     if ( cwd[cwd.length() - 1] == '/' ) {
 174          return cwd + path;
 175     }
 176
 177     return cwd + '/' + path;
 178 }