[PATCH 1/3] xdiff: -W: relax end-of-file function detection

[Vegard Nossum <vegard.nossum@oracle.com>]

When adding a new function to the end of a file, it's enough to know
that 1) the addition is at the end of the file; and 2) there is a
function _somewhere_ in there.

If we had simply been changing the end of an existing function, then we
would also be deleting something from the old version.

This fixes the case where we add e.g.

	// Begin of dummy
	static int dummy(void)
	{
	}

to the end of the file.

Cc: René Scharfe <l.s.r@web.de>
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
---
 xdiff/xemit.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index 7389ce4..8c88dbd 100644
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -183,16 +183,14 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
 
 				/*
 				 * We don't need additional context if
-				 * a whole function was added, possibly
-				 * starting with empty lines.
+				 * a whole function was added.
 				 */
-				while (i2 < xe->xdf2.nrec &&
-				       is_empty_rec(&xe->xdf2, i2))
+				while (i2 < xe->xdf2.nrec) {
+					if (match_func_rec(&xe->xdf2, xecfg, i2,
+						dummy, sizeof(dummy)) >= 0)
+						goto post_context_calculation;
 					i2++;
-				if (i2 < xe->xdf2.nrec &&
-				    match_func_rec(&xe->xdf2, xecfg, i2,
-						   dummy, sizeof(dummy)) >= 0)
-					goto post_context_calculation;
+				}
 
 				/*
 				 * Otherwise get more context from the
-- 
2.7.4