// readlines.c
// reads and displays lines from a file  
#include <stdio.h>

int main (int argc, char** argv) {
  int i = 0;
  int line = 1;
  char c; 
  char buff [128]; 
  FILE* f = fopen(argv[1],"r"); // open file named in argv[1] for reading
  while ((c = fgetc(f)) != EOF) { // EOF is "end of file" marker
    if (i >= 128) {
      printf("buffer overflow!\n");
      exit(0); // abort program if buffer overflow; 
               // there are security problems if this not done!
    } else if (c == '\n') {
      buff[i] = 0;
      printf("%d:\t%s\n", line, buff);
      i = 0; 
      line++;
    } else {
      buff[i++] = c;
    }
  }
}