Update several uses of hard-coded 40-based constants to use either
the_hash_algo or GIT_MAX_HEXSZ, as appropriate.  Replace a combined use
of oid_to_hex and memcpy with oid_to_hex_r, which not only avoids the
need for a constant, but is more efficient.  Make use of parse_oid_hex
to eliminate the need for constants and simplify the code at the same
time.  Update some comments to no longer refer to SHA-1 as well.

Signed-off-by: brian m. carlson <sand...@crustytoothpaste.net>
---
 upload-pack.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/upload-pack.c b/upload-pack.c
index 6261d4fab3..e9adbe2f87 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -450,7 +450,7 @@ static int get_common_commits(void)
                                break;
                        default:
                                got_common = 1;
-                               memcpy(last_hex, oid_to_hex(&oid), 41);
+                               oid_to_hex_r(last_hex, &oid);
                                if (multi_ack == 2)
                                        packet_write_fmt(1, "ACK %s common\n", 
last_hex);
                                else if (multi_ack)
@@ -492,7 +492,7 @@ static int do_reachable_revlist(struct child_process *cmd,
                "rev-list", "--stdin", NULL,
        };
        struct object *o;
-       char namebuf[42]; /* ^ + SHA-1 + LF */
+       char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
        int i;
 
        cmd->argv = argv;
@@ -561,15 +561,17 @@ static int get_reachable_list(struct object_array *src,
        struct child_process cmd = CHILD_PROCESS_INIT;
        int i;
        struct object *o;
-       char namebuf[42]; /* ^ + SHA-1 + LF */
+       char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
+       const unsigned hexsz = the_hash_algo->hexsz;
 
        if (do_reachable_revlist(&cmd, src, reachable) < 0)
                return -1;
 
-       while ((i = read_in_full(cmd.out, namebuf, 41)) == 41) {
+       while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
                struct object_id sha1;
+               const char *p;
 
-               if (namebuf[40] != '\n' || get_oid_hex(namebuf, &sha1))
+               if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
                        break;
 
                o = lookup_object(sha1.hash);
@@ -820,11 +822,9 @@ static void receive_needs(void)
                        continue;
                }
                if (!skip_prefix(line, "want ", &arg) ||
-                   get_oid_hex(arg, &oid_buf))
+                   parse_oid_hex(arg, &oid_buf, &features))
                        die("git upload-pack: protocol error, "
-                           "expected to get sha, not '%s'", line);
-
-               features = arg + 40;
+                           "expected to get object ID, not '%s'", line);
 
                if (parse_feature_request(features, "deepen-relative"))
                        deepen_relative = 1;

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