[PATCH 1/3] Make read_index_data() public

[Lukas Fleischer <git@cryptocrack.de>]

This allows for reusing the function in convert.c later.

Also, move it from attr.c to read-cache.c and add a use_index parameter
to specify a custom index_state since we are no longer enable to access
the static use_index variable from attr.c.

Signed-off-by: Lukas Fleischer <git@cryptocrack.de>
---
I am not totally sure whether read-cache.c is the best place for this...

 attr.c       | 35 +----------------------------------
 cache.h      |  1 +
 read-cache.c | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 35 insertions(+), 34 deletions(-)

diff --git a/attr.c b/attr.c
index 689bc2a..2e1ce7b 100644
--- a/attr.c
+++ b/attr.c
@@ -381,46 +381,13 @@ static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
 	return res;
 }
 
-static void *read_index_data(const char *path)
-{
-	int pos, len;
-	unsigned long sz;
-	enum object_type type;
-	void *data;
-	struct index_state *istate = use_index ? use_index : &the_index;
-
-	len = strlen(path);
-	pos = index_name_pos(istate, path, len);
-	if (pos < 0) {
-		/*
-		 * We might be in the middle of a merge, in which
-		 * case we would read stage #2 (ours).
-		 */
-		int i;
-		for (i = -pos - 1;
-		     (pos < 0 && i < istate->cache_nr &&
-		      !strcmp(istate->cache[i]->name, path));
-		     i++)
-			if (ce_stage(istate->cache[i]) == 2)
-				pos = i;
-	}
-	if (pos < 0)
-		return NULL;
-	data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
-	if (!data || type != OBJ_BLOB) {
-		free(data);
-		return NULL;
-	}
-	return data;
-}
-
 static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
 {
 	struct attr_stack *res;
 	char *buf, *sp;
 	int lineno = 0;
 
-	buf = read_index_data(path);
+	buf = read_index_data(path, use_index);
 	if (!buf)
 		return NULL;
 
diff --git a/cache.h b/cache.h
index ba5a47c..a71e443 100644
--- a/cache.h
+++ b/cache.h
@@ -471,6 +471,7 @@ extern int add_file_to_index(struct index_state *, const char *path, int flags);
 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 extern int index_name_is_other(const struct index_state *, const char *, int);
+extern void *read_index_data(const char *path, struct index_state *use_index);
 
 /* do stat comparison even if CE_VALID is true */
 #define CE_MATCH_IGNORE_VALID		01
diff --git a/read-cache.c b/read-cache.c
index 5a9704f..39e3424 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1899,3 +1899,36 @@ int index_name_is_other(const struct index_state *istate, const char *name,
 	}
 	return 1;
 }
+
+void *read_index_data(const char *path, struct index_state *use_index)
+{
+	int pos, len;
+	unsigned long sz;
+	enum object_type type;
+	void *data;
+	struct index_state *istate = use_index ? use_index : &the_index;
+
+	len = strlen(path);
+	pos = index_name_pos(istate, path, len);
+	if (pos < 0) {
+		/*
+		 * We might be in the middle of a merge, in which
+		 * case we would read stage #2 (ours).
+		 */
+		int i;
+		for (i = -pos - 1;
+		     (pos < 0 && i < istate->cache_nr &&
+		      !strcmp(istate->cache[i]->name, path));
+		     i++)
+			if (ce_stage(istate->cache[i]) == 2)
+				pos = i;
+	}
+	if (pos < 0)
+		return NULL;
+	data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
+	if (!data || type != OBJ_BLOB) {
+		free(data);
+		return NULL;
+	}
+	return data;
+}
-- 
1.8.2.675.gda3bb24.dirty