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in: increase the size of unread characters buffer

--- a/in.c

+++ b/in.c

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

 	FILE *fin;

 	char *buf;		/* for string buffers */

 	char **args;

-	int unbuf[8];		/* unread characters */

+	int unbuf[32];		/* unread characters */

 	int un;			/* number of unread characters */

 	int pos;

 	int len;

@@ -127,7 +127,7 @@

 {

 	if (c < 0)

 		return;

-	if (buf)

+	if (buf && buf->un < sizeof(buf->unbuf))

 		buf->unbuf[buf->un++] = c;

 }