Question

Using just System Calls, how do you read a file upto the EOF and in the process execute every line in the program, upto end of line.
Every line in my file, will have a program name that has to be executed.

 size_t fd1 = open("inputfile.txt", O_RDWR);
 char buf1[BUFFSIZE];
 while(read(fd1,buf1,10) != EOF) 
 {   
      if(fd1[MAXDATA] == "\n")

 }

Answer 1

i created a program with similar functionality recently:

#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#define BUFFERSIZE 1024
#define LINEMAXSIZE 2000
void main(int argvc,char** argv)
{
int filedesc=open(argv[1],O_RDONLY);
char buffer[BUFFERSIZE]; 

char expression[LINEMAXSIZE]; //the line
int exprindex=0;        //line index

int count=read(filedesc,buffer,sizeof(buffer));//read bytes

while(count!=EOF)
      {
            int i=0;
            while(i<count)
            {
            char c=buffer[i];
            if(c=='\n')
            {
                expression[exprindex++]='\0';
                char* line=strdup(expression);//create a new instance of the string
                system(line); //execute the line 
                exprindex=0;//set line index to 0
            }
            else
            {
                   expression[exprindex++]=c;

                if(exprindex>=LINEMAXSIZE)
                {
                printf("Line Max length reached\n");
                }

            }

        i++;
        }


        count=read(filedesc,buffer,sizeof(buffer));
    }
}