#define _POSIX_C_SOURCE 200809L

#include <stdio.h>

int ctoi(char c);

int main(int argc, char ** argv) {
  int i, j, oct_temp;
  char char_temp;
  int trailing_newline = 1; //1 if true, 0 if \c present

  for(i = 1; i < argc; i++) {
    for(j = 0; argv[i][j] != '\0'; j++) {
      if(argv[i][j] == '\\') {
	j++;
	switch(argv[i][j]) {
	  case 'a': printf("\a"); break;
	  case 'b': printf("\b"); break;
	  case 'c': trailing_newline = 0; break;
	  case 'f': printf("\f"); break;
	  case 'n': printf("\n"); break;
	  case 'r': printf("\r"); break;
	  case 't': printf("\t"); break;
	  case 'v': printf("\v"); break;
	  case '\\': printf("\\"); break;
	  case '0': {
	    j++;
	    oct_temp = ctoi(argv[i][j]);
	    j++;
	    if(ctoi(argv[i][j] != -1)) {
	      oct_temp *= 8;
	      oct_temp += ctoi(argv[i][j]);
	      j++;
	      if(ctoi(argv[i][j] != -1)) {
	        oct_temp *= 8;
	        oct_temp += ctoi(argv[i][j]);
	      } 
	      else {
	        j--;
	      }
	    } 
	    else {
	      j--;
	    }
	    printf("%c", (char)oct_temp);
	  }
	    break;
	  default: printf("\\%c", argv[i][j]);
	    break;
	}
      }
      else {
	printf("%c", argv[i][j]);
      }
    }
  }

  if(trailing_newline) {
    printf("\n");
  }

  return 0;
}

int ctoi(char c) {
  switch(c) {
    case '0': return 0;
    case '1': return 1;
    case '2': return 2;
    case '3': return 3;
    case '4': return 4;
    case '5': return 5;
    case '6': return 6;
    case '7': return 7;
    case '8': return 8;
    case '9': return 9;
    default: return -1;
  }
}