[PATCH v3 24/27] attr: tighten const correctness with git_attr and match_attr

[Brandon Williams]

Signed-off-by: Brandon Williams <bmw...@google.com>
---
 attr.c               | 12 ++++++------
 attr.h               |  2 +-
 builtin/check-attr.c |  3 ++-
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/attr.c b/attr.c
index 8f4402ef3..69643ae77 100644
--- a/attr.c
+++ b/attr.c
@@ -220,7 +220,7 @@ static void report_invalid_attr(const char *name, size_t 
len,
  * dictionary.  If no entry is found, create a new attribute and store it in
  * the dictionary.
  */
-static struct git_attr *git_attr_internal(const char *name, int namelen)
+static const struct git_attr *git_attr_internal(const char *name, int namelen)
 {
        struct git_attr *a;
 
@@ -244,14 +244,14 @@ static struct git_attr *git_attr_internal(const char 
*name, int namelen)
        return a;
 }
 
-struct git_attr *git_attr(const char *name)
+const struct git_attr *git_attr(const char *name)
 {
        return git_attr_internal(name, strlen(name));
 }
 
 /* What does a matched pattern decide? */
 struct attr_state {
-       struct git_attr *attr;
+       const struct git_attr *attr;
        const char *setto;
 };
 
@@ -278,7 +278,7 @@ struct pattern {
 struct match_attr {
        union {
                struct pattern pat;
-               struct git_attr *attr;
+               const struct git_attr *attr;
        } u;
        char is_macro;
        unsigned num_attr;
@@ -898,7 +898,7 @@ static int fill_one(const char *what, struct all_attrs_item 
*all_attrs,
        int i;
 
        for (i = a->num_attr - 1; rem > 0 && i >= 0; i--) {
-               struct git_attr *attr = a->state[i].attr;
+               const struct git_attr *attr = a->state[i].attr;
                const char **n = &(all_attrs[attr->attr_nr].value);
                const char *v = a->state[i].setto;
 
@@ -922,7 +922,7 @@ static int fill(const char *path, int pathlen, int 
basename_offset,
        const char *base = stk->origin ? stk->origin : "";
 
        for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
-               struct match_attr *a = stk->attrs[i];
+               const struct match_attr *a = stk->attrs[i];
                if (a->is_macro)
                        continue;
                if (path_matches(path, pathlen, basename_offset,
diff --git a/attr.h b/attr.h
index 5aaf55c3e..abebbc19c 100644
--- a/attr.h
+++ b/attr.h
@@ -11,7 +11,7 @@ struct all_attrs_item;
  * Given a string, return the gitattribute object that
  * corresponds to it.
  */
-struct git_attr *git_attr(const char *);
+const struct git_attr *git_attr(const char *);
 
 /* Internal use */
 extern const char git_attr__true[];
diff --git a/builtin/check-attr.c b/builtin/check-attr.c
index 40cdff13e..4d01ca0c8 100644
--- a/builtin/check-attr.c
+++ b/builtin/check-attr.c
@@ -166,7 +166,8 @@ int cmd_check_attr(int argc, const char **argv, const char 
*prefix)
        check = attr_check_alloc();
        if (!all_attrs) {
                for (i = 0; i < cnt; i++) {
-                       struct git_attr *a = git_attr(argv[i]);
+                       const struct git_attr *a = git_attr(argv[i]);
+
                        if (!a)
                                return error("%s: not a valid attribute name",
                                             argv[i]);
-- 
2.11.0.483.g087da7b7c-goog