struct ref_entry: nest the value part in a union

This change is obviously silly by itself, but it is a step towards
adding a second member to the union.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/refs.c b/refs.c
index 1f6890bf486fcb3b9022ab55f35aa63edbe56bab..416c97f8c973947c4f73fbab22bfcc29f7fdceb1 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -101,6 +101,11 @@ int check_refname_format(const char *refname, int flags)
 
 struct ref_entry;
 
+struct ref_value {
+       unsigned char sha1[20];
+       unsigned char peeled[20];
+};
+
 struct ref_array {
        int nr, alloc;
 
@@ -120,8 +125,9 @@ struct ref_array {
 
 struct ref_entry {
        unsigned char flag; /* ISSYMREF? ISPACKED? */
-       unsigned char sha1[20];
-       unsigned char peeled[20];
+       union {
+               struct ref_value value;
+       } u;
        /* The full name of the reference (e.g., "refs/heads/master"): */
        char name[FLEX_ARRAY];
 };
@@ -138,8 +144,8 @@ static struct ref_entry *create_ref_entry(const char *refname,
                die("Reference has invalid format: '%s'", refname);
        len = strlen(refname) + 1;
        ref = xmalloc(sizeof(struct ref_entry) + len);
-       hashcpy(ref->sha1, sha1);
-       hashclr(ref->peeled);
+       hashcpy(ref->u.value.sha1, sha1);
+       hashclr(ref->u.value.peeled);
        memcpy(ref->name, refname, len);
        ref->flag = flag;
        return ref;
@@ -210,7 +216,7 @@ static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2
 {
        if (!strcmp(ref1->name, ref2->name)) {
                /* Duplicate name; make sure that the SHA1s match: */
-               if (hashcmp(ref1->sha1, ref2->sha1))
+               if (hashcmp(ref1->u.value.sha1, ref2->u.value.sha1))
                        die("Duplicated ref, and SHA1s don't match: %s",
                            ref1->name);
                warning("Duplicated ref: %s", ref1->name);
@@ -262,13 +268,13 @@ static int do_one_ref(const char *base, each_ref_fn fn, int trim,
        if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
                if (entry->flag & REF_ISBROKEN)
                        return 0; /* ignore broken refs e.g. dangling symref */
-               if (!has_sha1_file(entry->sha1)) {
+               if (!has_sha1_file(entry->u.value.sha1)) {
                        error("%s does not point to a valid object!", entry->name);
                        return 0;
                }
        }
        current_ref = entry;
-       retval = fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
+       retval = fn(entry->name + trim, entry->u.value.sha1, entry->flag, cb_data);
        current_ref = NULL;
        return retval;
 }
@@ -531,7 +537,7 @@ static void read_packed_refs(FILE *f, struct ref_array *array)
                    strlen(refline) == 42 &&
                    refline[41] == '\n' &&
                    !get_sha1_hex(refline + 1, sha1))
-                       hashcpy(last->peeled, sha1);
+                       hashcpy(last->u.value.peeled, sha1);
        }
 }
 
@@ -653,7 +659,7 @@ static int resolve_gitlink_packed_ref(struct ref_cache *refs,
        if (ref == NULL)
                return -1;
 
-       memcpy(sha1, ref->sha1, 20);
+       memcpy(sha1, ref->u.value.sha1, 20);
        return 0;
 }
 
@@ -723,7 +729,7 @@ static int get_packed_ref(const char *refname, unsigned char *sha1)
        struct ref_array *packed = get_packed_refs(get_ref_cache(NULL));
        struct ref_entry *entry = search_ref_array(packed, refname);
        if (entry) {
-               hashcpy(sha1, entry->sha1);
+               hashcpy(sha1, entry->u.value.sha1);
                return 0;
        }
        return -1;
@@ -886,10 +892,10 @@ int peel_ref(const char *refname, unsigned char *sha1)
        if (current_ref && (current_ref->name == refname
                || !strcmp(current_ref->name, refname))) {
                if (current_ref->flag & REF_KNOWS_PEELED) {
-                       hashcpy(sha1, current_ref->peeled);
+                       hashcpy(sha1, current_ref->u.value.peeled);
                        return 0;
                }
-               hashcpy(base, current_ref->sha1);
+               hashcpy(base, current_ref->u.value.sha1);
                goto fallback;
        }
 
@@ -901,7 +907,7 @@ int peel_ref(const char *refname, unsigned char *sha1)
                struct ref_entry *r = search_ref_array(array, refname);
 
                if (r != NULL && r->flag & REF_KNOWS_PEELED) {
-                       hashcpy(sha1, r->peeled);
+                       hashcpy(sha1, r->u.value.peeled);
                        return 0;
                }
        }