[PATCH 31/41] wt-status: convert two uses of EMPTY_TREE_SHA1_HEX

[brian m. carlson]

Convert two uses of EMPTY_TREE_SHA1_HEX to use oid_to_hex_r and
the_hash_algo to avoid a dependency on a given hash algorithm.  Use
oid_to_hex_r in preference to oid_to_hex because the buffer needs to
last through several function calls which might exhaust the limit of
four static buffers.

Signed-off-by: brian m. carlson <sand...@crustytoothpaste.net>
---
 wt-status.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/wt-status.c b/wt-status.c
index 50815e5faf..857724bd60 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -600,10 +600,11 @@ static void wt_status_collect_changes_index(struct 
wt_status *s)
 {
        struct rev_info rev;
        struct setup_revision_opt opt;
+       char hex[GIT_MAX_HEXSZ + 1];
 
        init_revisions(&rev, NULL);
        memset(&opt, 0, sizeof(opt));
-       opt.def = s->is_initial ? EMPTY_TREE_SHA1_HEX : s->reference;
+       opt.def = s->is_initial ? oid_to_hex_r(hex, the_hash_algo->empty_tree) 
: s->reference;
        setup_revisions(0, NULL, &rev, &opt);
 
        rev.diffopt.flags.override_submodule_config = 1;
@@ -975,13 +976,14 @@ static void wt_longstatus_print_verbose(struct wt_status 
*s)
        struct setup_revision_opt opt;
        int dirty_submodules;
        const char *c = color(WT_STATUS_HEADER, s);
+       char hex[GIT_MAX_HEXSZ + 1];
 
        init_revisions(&rev, NULL);
        rev.diffopt.flags.allow_textconv = 1;
        rev.diffopt.ita_invisible_in_index = 1;
 
        memset(&opt, 0, sizeof(opt));
-       opt.def = s->is_initial ? EMPTY_TREE_SHA1_HEX : s->reference;
+       opt.def = s->is_initial ? oid_to_hex_r(hex, the_hash_algo->empty_tree) 
: s->reference;
        setup_revisions(0, NULL, &rev, &opt);
 
        rev.diffopt.output_format |= DIFF_FORMAT_PATCH;