scanner: fix reading of really long line

Current code is causing a failure in adding a set containing a really long list of elements. The failure occurs as soon as the line is longer than flex read buffer.

When a line is longer than scanner buffer size, the code in YY_INPUT forces a rewind to the beginning of the string because it does not find a end of line. The result is that the string is never parsed.

This patch updates the code by rewinding till we found a space.

---
 src/scanner.l | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

index f0ed8d4..2fafa71 100644
@@ -47,7 +47,8 @@
 		clearerr(yyin);							\
 	}									\
 	if (result > 1) {							\
-		while (result > 1 && buf[result - 1] != '\n')			\
+		while (result > 1 && 						\
+		       (buf[result - 1] != '\n' &&  buf[result - 1] != ' '))	\
 			result--, n++;						\
 		result--, n++;							\
 		fseek(yyin, -n, SEEK_CUR);					\

2.1.3

But the part that didn't fit in will be ignore, right? So the user will lose some elements in the set?

If so, I think it's better to spot an error via YY_FATAL_ERROR to indicate that the line is too long to the user.