From 5018e06c580dd21c958ec1672c26a3448faf0c55 Mon Sep 17 00:00:00 2001
From: zlg <zlg@zlg.space>
Date: Wed, 13 Feb 2013 20:48:44 -0600
Subject: Add license file, reorganize project

---
 1-24_syntax-checker.c | 163 --------------------------------------------------
 1 file changed, 163 deletions(-)
 delete mode 100644 1-24_syntax-checker.c

(limited to '1-24_syntax-checker.c')

diff --git a/1-24_syntax-checker.c b/1-24_syntax-checker.c
deleted file mode 100644
index 019b9bc..0000000
--- a/1-24_syntax-checker.c
+++ /dev/null
@@ -1,163 +0,0 @@
-#include <stdio.h>
-
-/* The C Programming Language: 2nd Edition
- * Exercise 1-24:
- * "Write a program to check a C program for rudimentary syntax errors like
- * unbalanced parentheses, brackets, and braces. Don't forget about quotes, both
- * single and double, escape sequences, and comments. (This program is hard if
- * you do it in full generality.)"
- *
- * Proksima from Freenode's ##c helped me understand full generality where
- * Ixquick, Wikipedia, and StackOverflow all failed: a program that has full
- * generality handles all use cases. In this case, my program should report no
- * errors from a well formed C source file, and return correct errors for every
- * non-valid C source file.
- *
- * I can tackle this one the same way I tackled the previous exercise: with a
- * FSM. The trick is in catching the mismatched levels.
- *
- * Post-solution note: switch() would've made this MUCH shorter...
- */
-
-char c;
-
-/* Set the state/count variables */
-int linenr, parens, brackets, braces, singqs, dubqs, escapes, mcomms, scomms = 0;
-
-int main() {
-	linenr = 1;
-	// Begin streaming!
-	while ((c = getchar()) != EOF) {
-		if (scomms == 1) {
-			if (c == '\n') {
-				scomms--;
-			} else {
-				continue;
-			}
-		} else if (mcomms == 1) {
-			if (c == '*') {
-				if (getchar() == '/') {
-					mcomms--;
-				}
-			}
-		} else {
-			// Check for escape sequences
-			if (c == '\\') {
-				escapes++;
-				c = getchar();
-				// This does not detect all sequences; just the ones covered in Chapter 1.
-				if (c != '\\' && c != 't' && c != '\'' && c != '"' && c != 'n' && c != 'b' && c != '0') {
-					break;
-				} else {
-					escapes--;
-				}
-			}
-			// Newline behavior
-			if (c == '\n') {
-				if (singqs > 0 || dubqs > 0) {
-					break;
-				}
-				linenr++;
-			}
-			// Parentheses
-			if (c == '(') {
-				parens++;
-			}
-			if (c == ')') {
-				parens -= 1;
-				if (parens < 0) {
-					break;
-				}
-			}
-			// Brackets
-			if (c == '[') {
-				brackets++;
-			}
-			if (c == ']') {
-				brackets--;
-				if (brackets < 0) {
-					break;
-				}
-			}
-			// Braces
-			if (c == '{') {
-				braces++;
-			}
-			if (c == '}') {
-				braces--;
-				if (braces < 0) {
-					break;
-				}
-			}
-			// Double quotes
-			if (c == '"') {
-				if (dubqs == 0) {
-					dubqs++;
-				} else {
-					dubqs--;
-				}
-			}
-			// Single quotes, which are only checked outside of doubles.
-			if (c == '\'' && dubqs == 0) {
-				if (singqs == 0) {
-					singqs++;
-				} else {
-					singqs--;
-				}
-			}
-			// Comment detection
-			if (c == '/') {
-				if (getchar() == '*') {
-					mcomms++;
-				}
-				if (getchar() == '/') {
-					scomms++;
-				}
-			}
-		}
-	}
-
-	if (escapes > 0) {
-		printf("Invalid escape sequence on line %d!\n", linenr);
-		return 1;
-	}
-	if (singqs > 0) {
-		printf("Unclosed single quote on line %d!\n", linenr);
-		return 1;
-	}
-	if (dubqs > 0) {
-		printf("Unclosed double quote on line %d!\n", linenr);
-		return 1;
-	}
-	if (brackets > 0) {
-		printf("Unclosed brackets on line %d!\n", linenr);
-		return 1;
-	}
-	if (brackets < 0) {
-		printf("Too many close brackets on line %d!\n", linenr);
-		return 1;
-	}
-	if (parens > 0) {
-		printf("Unclosed parenthesis on line %d!\n", linenr);
-		return 1;
-	}
-	if (parens < 0) {
-		printf("Too many close parentheses on line %d!\n", linenr);
-		return 1;
-	}
-	if (braces > 0) {
-		printf("Unclosed braces on line %d!\n", linenr);
-		return 1;
-	}
-	if (braces < 0) {
-		printf("Too many close braces on line %d!\n", linenr);
-		return 1;
-	}
-	if (mcomms == 1) {
-		printf("Unclosed comment at end of file!\n");
-		return 1;
-	}
-
-	printf("All clean.\n");
-	return 0;
-}
-- 
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