[PATCH 0/3] Remove ~25 lines of duplicate code

[PATCH 0/3] Remove ~25 lines of duplicate code

[Lukas Fleischer]

Merge read_index_data() and has_cr_in_index() which are almost 1:1
copies of each other.

Lukas Fleischer (3):
  Make read_index_data() public
  Add size parameter to read_index_data()
  convert.c: Remove duplicate code

 attr.c       | 35 +----------------------------------
 cache.h      |  1 +
 convert.c    | 27 ++-------------------------
 read-cache.c | 36 ++++++++++++++++++++++++++++++++++++
 4 files changed, 40 insertions(+), 59 deletions(-)

-- 
1.8.2.675.gda3bb24.dirty

[PATCH 1/3] Make read_index_data() public

[Lukas Fleischer]

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

Re: [PATCH 1/3] Make read_index_data() public

[Jeff King]

On Fri, Apr 12, 2013 at 07:26:11PM +0200, Lukas Fleischer wrote:

> 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.

I'm all for removing duplicated code, but, but I think the name
"read_index_data" is a bit misleading for a global function. I would
expect it to read data from the index (and the argument "path" does not
help clarify that at all).

Can we rename it read_blob_data_from_index_path() or something?

-Peff

Re: [PATCH 1/3] Make read_index_data() public

[Lukas Fleischer]

On Fri, Apr 12, 2013 at 03:40:12PM -0400, Jeff King wrote:
> On Fri, Apr 12, 2013 at 07:26:11PM +0200, Lukas Fleischer wrote:
> 
> > 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.
> 
> I'm all for removing duplicated code, but, but I think the name
> "read_index_data" is a bit misleading for a global function. I would
> expect it to read data from the index (and the argument "path" does not
> help clarify that at all).
> 
> Can we rename it read_blob_data_from_index_path() or something?

Pretty long function name... I agree that it is better to have a verbose
function name instead of something short that gives a wrong impression
of what the function does and I can't think of a shorter, yet
descriptive way to name the function.

If nobody comes up with an alternative suggestion, I will change it to
read_blob_data_from_index_path() and resubmit.

> 
> -Peff

[PATCH 2/3] Add size parameter to read_index_data()

[Lukas Fleischer]

This allows for optionally getting the size of the returned data and
will be used in a follow-up patch.

Signed-off-by: Lukas Fleischer <git@cryptocrack.de>
---
 attr.c       | 2 +-
 cache.h      | 2 +-
 read-cache.c | 5 ++++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/attr.c b/attr.c
index 2e1ce7b..e5af3c6 100644
--- a/attr.c
+++ b/attr.c
@@ -387,7 +387,7 @@ static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
 	char *buf, *sp;
 	int lineno = 0;
 
-	buf = read_index_data(path, use_index);
+	buf = read_index_data(path, use_index, NULL);
 	if (!buf)
 		return NULL;
 
diff --git a/cache.h b/cache.h
index a71e443..b281bbf 100644
--- a/cache.h
+++ b/cache.h
@@ -471,7 +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);
+extern void *read_index_data(const char *path, struct index_state *use_index, unsigned long *size);
 
 /* 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 39e3424..32dc471 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1900,7 +1900,8 @@ 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)
+void *read_index_data(const char *path, struct index_state *use_index,
+		      unsigned long *size)
 {
 	int pos, len;
 	unsigned long sz;
@@ -1930,5 +1931,7 @@ void *read_index_data(const char *path, struct index_state *use_index)
 		free(data);
 		return NULL;
 	}
+	if (size)
+		*size = sz;
 	return data;
 }
-- 
1.8.2.675.gda3bb24.dirty

[PATCH 3/3] convert.c: Remove duplicate code

[Lukas Fleischer]

has_cr_in_index() is an almost 1:1 copy of read_index_data() with some
additions. Invoke read_index_data() instead of using copy-pasted code.

Signed-off-by: Lukas Fleischer <git@cryptocrack.de>
---
 convert.c | 27 ++-------------------------
 1 file changed, 2 insertions(+), 25 deletions(-)

diff --git a/convert.c b/convert.c
index 3520252..0d9f8a9 100644
--- a/convert.c
+++ b/convert.c
@@ -153,36 +153,13 @@ static void check_safe_crlf(const char *path, enum crlf_action crlf_action,
 
 static int has_cr_in_index(const char *path)
 {
-	int pos, len;
 	unsigned long sz;
-	enum object_type type;
 	void *data;
 	int has_cr;
-	struct index_state *istate = &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)
+	data = read_index_data(path, NULL, &sz);
+	if (!data)
 		return 0;
-	data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
-	if (!data || type != OBJ_BLOB) {
-		free(data);
-		return 0;
-	}
-
 	has_cr = memchr(data, '\r', sz) != NULL;
 	free(data);
 	return has_cr;
-- 
1.8.2.675.gda3bb24.dirty

[PATCH v2 1/3] Add public function read_blob_data_from_index_path()

[Lukas Fleischer]

* Make the read_index_data() function public, rename it to
  read_blob_data_from_index_path() and move it from attr.c to
  read-cache.c.

* 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.

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

Signed-off-by: Lukas Fleischer <git@cryptocrack.de>
---
 attr.c       | 35 +----------------------------------
 cache.h      |  1 +
 read-cache.c | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 36 insertions(+), 34 deletions(-)

diff --git a/attr.c b/attr.c
index 689bc2a..08347b6 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_blob_data_from_index_path(path, use_index);
 	if (!buf)
 		return NULL;
 
diff --git a/cache.h b/cache.h
index ba5a47c..2a206aa 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_blob_data_from_index_path(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..964ae26 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1899,3 +1899,37 @@ int index_name_is_other(const struct index_state *istate, const char *name,
 	}
 	return 1;
 }
+
+void *read_blob_data_from_index_path(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

[PATCH v2 2/3] Add size parameter to read_blob_data_from_index_path()

[Lukas Fleischer]

This allows for optionally getting the size of the returned data and
will be used in a follow-up patch.

Signed-off-by: Lukas Fleischer <git@cryptocrack.de>
---
 attr.c       | 2 +-
 cache.h      | 2 +-
 read-cache.c | 5 ++++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/attr.c b/attr.c
index 08347b6..17338c8 100644
--- a/attr.c
+++ b/attr.c
@@ -387,7 +387,7 @@ static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
 	char *buf, *sp;
 	int lineno = 0;
 
-	buf = read_blob_data_from_index_path(path, use_index);
+	buf = read_blob_data_from_index_path(path, use_index, NULL);
 	if (!buf)
 		return NULL;
 
diff --git a/cache.h b/cache.h
index 2a206aa..a5272f2 100644
--- a/cache.h
+++ b/cache.h
@@ -471,7 +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_blob_data_from_index_path(const char *path, struct index_state *use_index);
+extern void *read_blob_data_from_index_path(const char *path, struct index_state *use_index, unsigned long *size);
 
 /* 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 964ae26..547e98a 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1901,7 +1901,8 @@ int index_name_is_other(const struct index_state *istate, const char *name,
 }
 
 void *read_blob_data_from_index_path(const char *path,
-				     struct index_state *use_index)
+				     struct index_state *use_index,
+				     unsigned long *size)
 {
 	int pos, len;
 	unsigned long sz;
@@ -1931,5 +1932,7 @@ void *read_blob_data_from_index_path(const char *path,
 		free(data);
 		return NULL;
 	}
+	if (size)
+		*size = sz;
 	return data;
 }
-- 
1.8.2.675.gda3bb24.dirty

[PATCH v2 3/3] convert.c: Remove duplicate code

[Lukas Fleischer]

has_cr_in_index() is an almost 1:1 copy of
read_blob_data_from_index_path() with some additions. Invoke
read_blob_data_from_index_path() instead of using copy-pasted code.

Signed-off-by: Lukas Fleischer <git@cryptocrack.de>
---
 convert.c | 27 ++-------------------------
 1 file changed, 2 insertions(+), 25 deletions(-)

diff --git a/convert.c b/convert.c
index 3520252..a12bc78 100644
--- a/convert.c
+++ b/convert.c
@@ -153,36 +153,13 @@ static void check_safe_crlf(const char *path, enum crlf_action crlf_action,
 
 static int has_cr_in_index(const char *path)
 {
-	int pos, len;
 	unsigned long sz;
-	enum object_type type;
 	void *data;
 	int has_cr;
-	struct index_state *istate = &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)
+	data = read_blob_data_from_index_path(path, NULL, &sz);
+	if (!data)
 		return 0;
-	data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
-	if (!data || type != OBJ_BLOB) {
-		free(data);
-		return 0;
-	}
-
 	has_cr = memchr(data, '\r', sz) != NULL;
 	free(data);
 	return has_cr;
-- 
1.8.2.675.gda3bb24.dirty

Re: [PATCH v2 1/3] Add public function read_blob_data_from_index_path()

[Junio C Hamano]

Thanks. I'll queue with the following API fix-up on this, with
obvious adjustments necessary for the later ones.

 * read_blob_data_from_index() is descriptive enough. If you read a
   blob from the index, you would ask for it with a path; there is
   no other sensible key to do so.

 * A function in read-cache API that works on an index should have
   the istate as the first argument and called with name "index";

 * If callers want to operate on the default index, macro with a
   similar name but replacing "index" with "cache" can be supplied,
   e.g.

   #define distim_cache(x) distim_index(&the_index, x)
---
 attr.c       | 2 +-
 cache.h      | 3 ++-
 read-cache.c | 4 +---
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/attr.c b/attr.c
index a668a63..46bde57 100644
--- a/attr.c
+++ b/attr.c
@@ -387,7 +387,7 @@ static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
 	char *buf, *sp;
 	int lineno = 0;
 
-	buf = read_blob_data_from_index_path(path, use_index);
+	buf = read_blob_data_from_index(use_index, path);
 	if (!buf)
 		return NULL;
 
diff --git a/cache.h b/cache.h
index 85ddb13..5d66c74 100644
--- a/cache.h
+++ b/cache.h
@@ -307,6 +307,7 @@ extern void free_name_hash(struct index_state *istate);
 #define resolve_undo_clear() resolve_undo_clear_index(&the_index)
 #define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
 #define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
+#define read_blob_data_from_cache(path) read_blob_data_from_index(&the_index, (path))
 #endif
 
 enum object_type {
@@ -452,7 +453,7 @@ 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_blob_data_from_index_path(const char *path, struct index_state *use_index);
+extern void *read_blob_data_from_index(struct index_state *, const char *);
 
 /* 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 cbeb248..48d87e8 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1896,14 +1896,12 @@ int index_name_is_other(const struct index_state *istate, const char *name,
 	return 1;
 }
 
-void *read_blob_data_from_index_path(const char *path,
-				     struct index_state *use_index)
+void *read_blob_data_from_index(struct index_state *istate, 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);
-- 
1.8.2.1-514-gf369d36

Re: [PATCH v2 1/3] Add public function read_blob_data_from_index_path()

[Junio C Hamano]

Junio C Hamano <gitster@pobox.com> writes:

> diff --git a/attr.c b/attr.c
> index a668a63..46bde57 100644
> --- a/attr.c
> +++ b/attr.c
> @@ -387,7 +387,7 @@ static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
>  	char *buf, *sp;
>  	int lineno = 0;
>  
> -	buf = read_blob_data_from_index_path(path, use_index);
> +	buf = read_blob_data_from_index(use_index, path);

This was wrong.

The one I'll push out will have:

	buf = read_blob_data_from_index(use_index ? use_index : &the_index, path);

Re: [PATCH v2 1/3] Add public function read_blob_data_from_index_path()

[Lukas Fleischer]

On Sat, Apr 13, 2013 at 10:49:36PM -0700, Junio C Hamano wrote:
> Thanks. I'll queue with the following API fix-up on this, with
> obvious adjustments necessary for the later ones.
> 
>  * read_blob_data_from_index() is descriptive enough. If you read a
>    blob from the index, you would ask for it with a path; there is
>    no other sensible key to do so.
> 
>  * A function in read-cache API that works on an index should have
>    the istate as the first argument and called with name "index";
> 
>  * If callers want to operate on the default index, macro with a
>    similar name but replacing "index" with "cache" can be supplied,
>    e.g.
> 
>    #define distim_cache(x) distim_index(&the_index, x)
> ---
>  attr.c       | 2 +-
>  cache.h      | 3 ++-
>  read-cache.c | 4 +---
>  3 files changed, 4 insertions(+), 5 deletions(-)

Sounds reasonable to me -- squashing the fixed up version into my
original patch ([PATCH v2 1/1] Add public function
read_blob_data_from_index_path()) probably makes sense here :)

Thanks for reviewing and reworking!

> 
> diff --git a/attr.c b/attr.c
> index a668a63..46bde57 100644
> --- a/attr.c
> +++ b/attr.c
> @@ -387,7 +387,7 @@ static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
>  	char *buf, *sp;
>  	int lineno = 0;
>  
> -	buf = read_blob_data_from_index_path(path, use_index);
> +	buf = read_blob_data_from_index(use_index, path);
>  	if (!buf)
>  		return NULL;
>  
> diff --git a/cache.h b/cache.h
> index 85ddb13..5d66c74 100644
> --- a/cache.h
> +++ b/cache.h
> @@ -307,6 +307,7 @@ extern void free_name_hash(struct index_state *istate);
>  #define resolve_undo_clear() resolve_undo_clear_index(&the_index)
>  #define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
>  #define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
> +#define read_blob_data_from_cache(path) read_blob_data_from_index(&the_index, (path))
>  #endif
>  
>  enum object_type {
> @@ -452,7 +453,7 @@ 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_blob_data_from_index_path(const char *path, struct index_state *use_index);
> +extern void *read_blob_data_from_index(struct index_state *, const char *);
>  
>  /* 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 cbeb248..48d87e8 100644
> --- a/read-cache.c
> +++ b/read-cache.c
> @@ -1896,14 +1896,12 @@ int index_name_is_other(const struct index_state *istate, const char *name,
>  	return 1;
>  }
>  
> -void *read_blob_data_from_index_path(const char *path,
> -				     struct index_state *use_index)
> +void *read_blob_data_from_index(struct index_state *istate, 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);
> -- 
> 1.8.2.1-514-gf369d36
> 
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