untracked-cache: simplify parsing by dropping "next"

When we parse an on-disk untracked cache, we have two pointers, "data"
and "next". As we parse, we point "next" to the end of an element, and
then later update "data" to match.

But we actually don't need two pointers. Each parsing step can just
update "data" directly from other variables we hold (and we don't have
to worry about bailing in an intermediate state, since any parsing
failure causes us to immediately discard "data" and return).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/dir.c b/dir.c
index 7b0513c4766491d0090adb09ce3764d9c71c666b..17865f44df54ba733442c2e3c6b16ee8720fa814 100644 (file)
--- a/dir.c
+++ b/dir.c
@@ -2732,50 +2732,44 @@ static int read_one_dir(struct untracked_cache_dir **untracked_,
                        struct read_data *rd)
 {
        struct untracked_cache_dir ud, *untracked;
-       const unsigned char *next, *data = rd->data, *end = rd->end;
+       const unsigned char *data = rd->data, *end = rd->end;
        const unsigned char *eos;
        unsigned int value;
        int i, len;
 
        memset(&ud, 0, sizeof(ud));
 
-       next = data;
-       value = decode_varint(&next);
-       if (next > end)
+       value = decode_varint(&data);
+       if (data > end)
                return -1;
        ud.recurse         = 1;
        ud.untracked_alloc = value;
        ud.untracked_nr    = value;
        if (ud.untracked_nr)
                ALLOC_ARRAY(ud.untracked, ud.untracked_nr);
-       data = next;
 
-       next = data;
-       ud.dirs_alloc = ud.dirs_nr = decode_varint(&next);
-       if (next > end)
+       ud.dirs_alloc = ud.dirs_nr = decode_varint(&data);
+       if (data > end)
                return -1;
        ALLOC_ARRAY(ud.dirs, ud.dirs_nr);
-       data = next;
 
        eos = memchr(data, '\0', end - data);
        if (!eos || eos == end)
                return -1;
        len = eos - data;
-       next = eos + 1;
 
        *untracked_ = untracked = xmalloc(st_add3(sizeof(*untracked), len, 1));
        memcpy(untracked, &ud, sizeof(ud));
        memcpy(untracked->name, data, len + 1);
-       data = next;
+       data = eos + 1;
 
        for (i = 0; i < untracked->untracked_nr; i++) {
                eos = memchr(data, '\0', end - data);
                if (!eos || eos == end)
                        return -1;
                len = eos - data;
-               next = eos + 1;
                untracked->untracked[i] = xmemdupz(data, len);
-               data = next;
+               data = eos + 1;
        }
 
        rd->ucd[rd->index++] = untracked;