/* performs rudimentary error checking on C programs, warning of
 * unbalanced parenthesis, brackets, and braces (single qoutes, double
 * qoutes, escape sequences, and comments are handled appropriately)
 */

#include <stdio.h>

int lparens;
int rparens;
int lbracks;
int rbracks;
int lbraces;
int rbraces;

void check(int c) {

     switch (c) {
     case '(':
	  lparens++;
	  break;
     case ')':
	  rparens++;
	  break;
     case '[':
	  lbracks++;
	  break;
     case ']':
	  rbracks++;
	  break;
     case '{':
	  lbraces++;
	  break;
     case '}':
	  rbraces++;
	  break;
     case '\'':
	  while ((c=getchar()) != '\'' && c != EOF)
	       if (c == '\\') getchar();
	  break;
     case '\"':
	  while ((c=getchar()) != '\"' && c != EOF)
	       if (c == '\\') getchar();
	  break;
     case '/':
	  if ((c=getchar()) == '*') {
	       while ((c=getchar()) != EOF) {
		    if (c == '*') {
			 if ((c=getchar()) == '/')
			      break;
		    }
	       }
	  } else {
	       check(c);
	  }
	  break;
     case '\\':
	  getchar();
	  break;
     }
}

int main(void) {
     int c;

     while((c=getchar()) != EOF)
	  check(c);

     if (lparens != rparens)
	  printf("mismatched parenthesis: %d, %d\n", lparens, rparens);
     if (lbraces != rbraces)
	  printf("mismatched braces: %d, %d\n", lbraces, rbraces);
     if (lbracks != rbracks)
	  printf("mismatched brackets: %d, %d\n", lbracks, rbracks);

     return 0;
}