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Use a define for the size of line

Remember Roberto, it is not a good idea to use magic numbers!

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -10,9 +10,7 @@

 #include "cc2.h"

-#define STR(x) XSTR(x)

-#define XSTR(x) #x

-

+#define MAXLINE 200

 #define NR_STACKSIZ 32

 #define NR_NODEPOOL 128

 #define NR_EXPRESSIONS 64

@@ -231,7 +229,7 @@

 	void (*fun)(char *tok);

 	uint8_t len;

 	int c;

-	char line[200];

+	char line[MAXLINE];

 	for (;;) {

 		switch (c = getchar()) {