[PATCH 2/4] Abstract _locate_element() some more with elem_size parameter.

[Yann Dirson <ydirson@xxxxxxxxxx>]

Now offset calculations don't rely on pointer arithmetic any more, paving
the way for complete decoupling from diff_rename_dst.
---
 diffcore-rename.c |   23 +++++++++++++----------
 1 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/diffcore-rename.c b/diffcore-rename.c
index fc554e4..6e7ab4a 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -8,7 +8,7 @@
 
 #define locate_element(list,elem,insert_ok)			\
 	_locate_element(elem, &list##_nr, &list##_alloc,	\
-			insert_ok)
+			sizeof(*list), insert_ok)
 
 /* Table of rename/copy destinations */
 
@@ -22,15 +22,16 @@ static int rename_dst_nr, rename_dst_alloc;
 
 static struct diff_rename_dst *_locate_element(struct diff_filespec *two,
 					       int *elem_nr_p, int *elem_alloc_p,
-					       int insert_ok)
+					       size_t elem_size, int insert_ok)
 {
 	int first, last;
+	struct diff_rename_dst *first_elem_p;
 
 	first = 0;
 	last = (*elem_nr_p);
 	while (last > first) {
 		int next = (last + first) >> 1;
-		struct diff_rename_dst *dst = &(rename_dst[next]);
+		struct diff_rename_dst *dst = (void*)rename_dst + (next * elem_size);
 		int cmp = strcmp(two->path, dst->two->path);
 		if (!cmp)
 			return dst;
@@ -47,16 +48,18 @@ static struct diff_rename_dst *_locate_element(struct diff_filespec *two,
 	if ((*elem_alloc_p) <= (*elem_nr_p)) {
 		(*elem_alloc_p) = alloc_nr(*elem_alloc_p);
 		rename_dst = xrealloc(rename_dst,
-				      (*elem_alloc_p) * sizeof(*rename_dst));
+				      (*elem_alloc_p) * elem_size);
 	}
 	(*elem_nr_p)++;
+	first_elem_p = (void*)rename_dst + first * elem_size;
 	if (first < (*elem_nr_p))
-		memmove(rename_dst + first + 1, rename_dst + first,
-			((*elem_nr_p) - first - 1) * sizeof(*rename_dst));
-	rename_dst[first].two = alloc_filespec(two->path);
-	fill_filespec(rename_dst[first].two, two->sha1, two->mode);
-	rename_dst[first].pair = NULL;
-	return &(rename_dst[first]);
+		memmove((void*)rename_dst + (first + 1) * elem_size,
+			first_elem_p,
+			((*elem_nr_p) - first - 1) * elem_size);
+	first_elem_p->two = alloc_filespec(two->path);
+	fill_filespec(first_elem_p->two, two->sha1, two->mode);
+	first_elem_p->pair = NULL;
+	return first_elem_p;
 }
 
 /* Table of rename/copy src files */
-- 
1.7.2.3

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