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#include <stdio.h>
#define MAXLEN 1000
#define TRUE 1
#define FALSE 0
#define INLINE 2
#define MULTILINE 3
/* checks c program for unbalanced parentheses, brackets and braces */
int main(int argc, char *argv[]) {
int p, c, i, comment, quote, parens, bracks, braces;
p = 0;
comment = quote = FALSE;
parens = bracks = braces = 0;
for (i = 0; i < MAXLEN - 1 && (c = getchar()) != EOF; i++) {
if (!comment && !quote && (c == '/' || c == '*') && p == '/') {
comment = c == '/' ? INLINE : MULTILINE;
} else if (!comment && !quote && c == '"') {
quote = TRUE;
} else if (comment == INLINE && c == '\n') {
comment = FALSE;
} else if (comment == MULTILINE && c == '/' && p == '*') {
comment = FALSE;
}
if (!comment && quote && c == '"' && p != '\\') {
quote = FALSE;
} else if (!comment && !quote) {
if (c == '{')
braces++;
else if (c == '(')
parens++;
else if (c == '[')
bracks++;
else if (c == '}')
braces--;
else if (c == ')')
parens--;
else if (c == ']')
bracks--;
}
p = c;
}
if (braces != 0)
printf("err: input contains %d open braces\n", braces);
if (parens != 0)
printf("err: input contains %d open parentheses\n", parens);
if (bracks != 0)
printf("err: input contains %d open brackets\n", bracks);
if (braces == 0 && parens == 0 && bracks == 0)
printf("no basic syntax errors!\n");
return 0;
}
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