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#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <string.h>
#include <unistd.h>
#define BUF_SIZE 8192
int main(int argc, char* argv[]){
int input_fd;
char buffer[BUF_SIZE];
//If the arguments are not equal to 3.
if(argc != 3){
printf ("Arguments missing");
return 1;
}
input_fd = open(argv[2], O_RDONLY | O_CREAT, 0644);
//File not exists
if (input_fd == -1) {
perror ("open");
return 2;
}
//Declaring the buffer size and line number.
int i = 0;
int counter=0;
int line = 1;
while (read(input_fd, &buffer[i], 1) == 1) {
/* end of line */
if (buffer[i] == 'n' || buffer[i] == 0x0) {
//make the last character to 0 which is /n.
buffer[i] = 0;
if (strstr(buffer, argv[1])) {
//word found in the buffer.
printf("%s was found in line %dn",argv[1] ,line);
//prints in a separate line.
puts(buffer);
printf("n");
counter++;
}
//increment line number and the buffer.
line++;
i = 0;
continue;
}
i++;
}
printf(" Total occurances of %s:%dn",argv[1] ,counter);
close (input_fd);
return (EXIT_SUCCESS);
}
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