C - Check a C program for rudimentary syntax errors

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/*
 * Write a program to check a C program for rudimentary syntax errors like
 * unmatched parentheses, brackets and braces. Don’t forget about quotes,
 * both single and double, escape sequences, and comments.
 *
 * SyntaxChecker.c - by FreeMan
 */

#include <stdio.h>

#define MAXLINE 1024 /* Max input line size */

char line[MAXLINE]; /* Current input line */
int GetLine(void);

int main()
{
	int len = 0;
	int t = 0;
	int brace = 0, bracket = 0, parenthesis = 0;
	int singleQuote = 1, doubleQuote = 1;

	while ((len = GetLine()) > 0)
	{
		t = 0;
		while (t < len)
		{
			if (line[t] == '{')
			{
				brace++;
			}
			if (line[t] == '}')
			{
				brace--;
			}
			if (line[t] == '[')
			{
				bracket++;
			}
			if (line[t] == ']')
			{
				bracket--;
			}
			if (line[t] == '(')
			{
				parenthesis++;
			}
			if (line[t] == ')')
			{
				parenthesis--;
			}
			if (line[t] == '\'')
			{
				singleQuote *= -1;
			}
			if (line[t] == '"')
			{
				doubleQuote *= -1;
			}
			t++;
		}
	}
	if (doubleQuote != 1)
	{
		printf("Mismatching double quote mark.\n");
	}
	if (singleQuote != 1)
	{
		printf("Mismatching single quote mark.\n");
	}
	if (parenthesis != 0)
	{
		printf("Mismatching parenthesis.\n");
	}
	if (bracket != 0)
	{
		printf("Mismatching bracket mark.\n");
	}
	if (brace != 0)
	{
		printf("Mismatching brace mark.\n");
	}
	if (brace == 0 && bracket == 0 && parenthesis == 0 && singleQuote == 1 && doubleQuote == 1)
	{
		printf("Syntax appears to be correct.\n");
	}

	return 0;
}

/* GetLine: Specialized version */
int GetLine(void)
{
	int c, i;
	extern char line[];

	for (i = 0; i < MAXLINE - 1 && (c = getchar()) != EOF && c != '\n'; ++i)
	{
		line[i] = c;
	}
	if (c == '\n')
	{
		line[i] = c;
		++i;
	}
	line[i] = '\0';

	return i;
}