#include <stdio.h>

#include <unistd.h>

#include <fcntl.h>

#include "functions.h"

#include <sys/file.h>

int main(int argc, char *argv[]){

int i, fd;

int aux = NUMBER_OF_LINES*POSITION_OF_NEWLINE;

int lineCounter=0;

char currentChar;

char* buf = (char*)malloc(sizeof(char)*(aux+1));

char* file;

printf("%s\n", argv[1]);

if(argv[1] == NULL){

file = fileSelector();

}else{

file = argv[1];

}

if((fd = open(file, O_RDONLY)) < 0){

perror("Cannot open file");

exit(-1);

}

if(flock(fd, LOCK_SH) < 0){

perror("Failed to lock file");

exit(-1);

}

if((read(fd, buf, aux)) < 0){

perror("Failed to read file");

exit(-1);

}

if(validLetter(buf[0])){

for(i=0; lineCounter < NUMBER_OF_LINES; i++){

if(i%POSITION_OF_NEWLINE != NUMBER_OF_LETTERS){

if(buf[i]!=buf[0]) {

return -1;

}

}else{

if(buf[i] != '\n') {

return -1;

}

lineCounter++;

}

}

if(!read(fd, buf, aux)){

if(flock(fd, LOCK_UN) < 0){

perror("Failed to unlock file");

exit(-1);

}

if((close(fd))< 0){

perror("Failed to close file");

exit(-1);

}

return 0;

}else{

return -1;

}

}else{

return -1;

}

}