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object-name: extract function to parse object ID prefixes

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Extract the logic that parses an object ID prefix into a new function.
This function will be used by a second callsite in a subsequent commit.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt
2026-03-20 08:07:32 +01:00
committed by Junio C Hamano
parent e30bff8f84
commit 28c9254e3b
1 changed files with 38 additions and 22 deletions
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60
object-name.c
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@@ -270,41 +270,57 @@ int set_disambiguate_hint_config(const char *var, const char *value)
return error("unknown hint type for '%s': %s", var, value);
}
static int parse_oid_prefix(const char *name, int len,
const struct git_hash_algo *algo,
char *hex_out,
struct object_id *oid_out)
{
for (int i = 0; i < len; i++) {
unsigned char c = name[i];
unsigned char val;
if (c >= '0' && c <= '9') {
val = c - '0';
} else if (c >= 'a' && c <= 'f') {
val = c - 'a' + 10;
} else if (c >= 'A' && c <='F') {
val = c - 'A' + 10;
c -= 'A' - 'a';
} else {
return -1;
}
if (hex_out)
hex_out[i] = c;
if (oid_out) {
if (!(i & 1))
val <<= 4;
oid_out->hash[i >> 1] |= val;
}
}
if (hex_out)
hex_out[len] = '\0';
if (oid_out)
oid_out->algo = algo ? hash_algo_by_ptr(algo) : GIT_HASH_UNKNOWN;
return 0;
}
static int init_object_disambiguation(struct repository *r,
const char *name, int len,
const struct git_hash_algo *algo,
struct disambiguate_state *ds)
{
int i;
if (len < MINIMUM_ABBREV || len > GIT_MAX_HEXSZ)
return -1;
memset(ds, 0, sizeof(*ds));
for (i = 0; i < len ;i++) {
unsigned char c = name[i];
unsigned char val;
if (c >= '0' && c <= '9')
val = c - '0';
else if (c >= 'a' && c <= 'f')
val = c - 'a' + 10;
else if (c >= 'A' && c <='F') {
val = c - 'A' + 10;
c -= 'A' - 'a';
}
else
return -1;
ds->hex_pfx[i] = c;
if (!(i & 1))
val <<= 4;
ds->bin_pfx.hash[i >> 1] |= val;
}
if (parse_oid_prefix(name, len, algo, ds->hex_pfx, &ds->bin_pfx) < 0)
return -1;
ds->len = len;
ds->hex_pfx[len] = '\0';
ds->repo = r;
ds->bin_pfx.algo = algo ? hash_algo_by_ptr(algo) : GIT_HASH_UNKNOWN;
odb_prepare_alternates(r->objects);
return 0;
}