Index: API uniformisation: Use unsigned int for all index number.

Feature Added: Search an unmerged entry by path (git_index_get_unmerged
renamed to git_index_get_unmerged_bypath) or by index (git_index_get_unmerged_byindex).

include/git2/index.h

@@ -257,7 +257,7 @@ GIT_EXTERN(int) git_index_remove(git_index *index, int position);
  * @param n the position of the entry
  * @return a pointer to the entry; NULL if out of bounds
  */
-GIT_EXTERN(git_index_entry *) git_index_get(git_index *index, int n);
+GIT_EXTERN(git_index_entry *) git_index_get(git_index *index, unsigned int n);
 
 /**
  * Get the count of entries currently in the index
@@ -285,7 +285,19 @@ GIT_EXTERN(unsigned int) git_index_entrycount_unmerged(git_index *index);
  * @param path path to search
  * @return the unmerged entry; NULL if not found
  */
-GIT_EXTERN(const git_index_entry_unmerged *) git_index_get_unmerged(git_index *index, const char *path);
+GIT_EXTERN(const git_index_entry_unmerged *) git_index_get_unmerged_bypath(git_index *index, const char *path);
+
+/**
+ * Get an unmerged entry from the index.
+ *
+ * The returned entry is read-only and should not be modified
+ * of freed by the caller.
+ *
+ * @param index an existing index object
+ * @param n the position of the entry
+ * @return a pointer to the unmerged entry; NULL if out of bounds
+ */
+GIT_EXTERN(const git_index_entry_unmerged *) git_index_get_unmerged_byindex(git_index *index, unsigned int n);
 
 /**
  * Return the stage number from a git index entry

src/index.c

@@ -322,11 +322,11 @@ unsigned int git_index_entrycount_unmerged(git_index *index)
 	return index->unmerged.length;
 }
 
-git_index_entry *git_index_get(git_index *index, int n)
+git_index_entry *git_index_get(git_index *index, unsigned int n)
 {
 	assert(index);
 	sort_index(index);
-	return git_vector_get(&index->entries, (unsigned int)n);
+	return git_vector_get(&index->entries, n);
 }
 
 static void sort_index(git_index *index)
@@ -479,7 +479,7 @@ int git_index_find(git_index *index, const char *path)
 	return git_vector_bsearch2(&index->entries, index_srch, path);
 }
 
-const git_index_entry_unmerged *git_index_get_unmerged(git_index *index, const char *path)
+const git_index_entry_unmerged *git_index_get_unmerged_bypath(git_index *index, const char *path)
 {
 	int pos;
 	assert(index && path);
@@ -493,6 +493,12 @@ const git_index_entry_unmerged *git_index_get_unmerged(git_index *index, const c
 	return git_vector_get(&index->unmerged, pos);
 }
 
+const git_index_entry_unmerged *git_index_get_unmerged_byindex(git_index *index, unsigned int n)
+{
+	assert(index);
+	return git_vector_get(&index->unmerged, n);
+}
+
 
 static int read_tree_internal(git_index_tree **out,
 		const char **buffer_in, const char *buffer_end, git_index_tree *parent)