syntax-validate-parenthese.c

/* Copyright © 2021-2023 Chee Bin HOH. All rights reserved.
 *
 * Validate that a C or C like program has right number of open and close
 * parathenses.
 */

#include <stdio.h>

#define YES 1
#define NO 0

int main(int argc, char *argv[]) {
  int c;
  int numOfOpenParenthese = 0;
  int inString = NO;

  while ((c = getchar()) != EOF) {
    if ('"' == c) {
      inString = !inString;
    } else if (!inString) {
      if ('(' == c) {
        numOfOpenParenthese++;
      } else if (')' == c) {
        numOfOpenParenthese--;
      }
    }
  }

  if (0 == numOfOpenParenthese)
    printf("has valid parenthese\n");
  else if (numOfOpenParenthese > 0)
    printf("missing close parenthese\n");
  else
    printf("missing open parenthese\n");

  return 0;
}