syshelpers.h

/*
 * This file (syshelpers.h) is part of h4r_ev3_control.
 * Date: 22.11.2015
 *
 * Author: Christian Holl
 * http://github.com/Hacks4ROS
 *
 * h4r_ev3_control 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.
 *
 * h4r_ev3_control 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 ev3_control.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
#ifndef SYSHELPERS_H_
#define SYSHELPERS_H_


#include <string>
#include <map>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <dirent.h>

#include <h4r_ev3_control/FixedBuffer.h>
#include <h4r_ev3_control/StringEnum.h>

namespace ev3_control
{

typedef FixedBuffer::FixedBuffer<256> FileNameBuffer;

bool pathExists(const char* path);


bool writeIntToSysFile(FILE *fileptr,int value);

bool readIntFromSysFile(FILE *fileptr, int &value);

template <typename T>
bool writeKeyToSysFile(FILE *fileptr, const StringEnum<T> &strmap, T key)
{

        char outbuf[256];
        int len=strlen(strmap[key]);
        strncpy(outbuf, strmap[key], len);

       int wrote=fwrite(outbuf,1,len,fileptr);

       if(fflush(fileptr))
           return false;
       rewind(fileptr);

       return wrote==len;
}

template <typename T>
bool readKeyFromSysFile(FILE *fileptr,const StringEnum<T> &strmap, T &value)
{
       fflush(fileptr);
       rewind(fileptr);
       int64_t value_out;

       char buffer[256];
       char *buf=&buffer[0];
       char **bufptr=&buf;

       bool negative;
       ssize_t read;
       size_t len=256;
       int l=0;
       bool ok=false;
       while ((read = getline(bufptr, &len, fileptr)) != -1) {
           if(l==0)
           {
               buffer[read-1]=0x00;//remove linefeed!
               value=strmap[buffer];
               if(value<0)
               {
                   return false;
               }
               else
               {
                   ok=true;
               }

           }
           else
           {
               if(l!=1 || read!=1)
               {
                   return false;
               }
           }

           return ok;
       }


       fscanf(fileptr,"%[^\n]",buffer);
       return true;
}

bool matchFileContentInEqualSubdirectories(const char* parent,
                                           const char* file,
                                           const char* content,
                                           FileNameBuffer &match_dir);

} /*ev3_control*/
#endif /* SYSHELPERS_H_ */