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is_refname_available(): use dirname in first loop

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In the first loop (over prefixes of refname), use dirname to keep
track of the current prefix. This is not an improvement in itself, but
in a moment we will start using dirname for a role where a
NUL-terminated string is needed.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
This commit is contained in:
Michael Haggerty 2015-05-11 17:25:10 +02:00 committed by Junio C Hamano
parent 521331cc9f
commit 61da596992
1 changed files with 26 additions and 14 deletions
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40
refs.c
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@ -878,26 +878,30 @@ static int is_refname_available(const char *refname,
const char *slash;
int pos;
struct strbuf dirname = STRBUF_INIT;
int ret = 0;
/*
* For the sake of comments in this function, suppose that
* refname is "refs/foo/bar".
*/
strbuf_grow(&dirname, strlen(refname) + 1);
for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
/* Expand dirname to the new prefix, not including the trailing slash: */
strbuf_add(&dirname, refname + dirname.len, slash - refname - dirname.len);
/*
* We are still at a leading dir of the refname (e.g.,
* "refs/foo"; if there is a reference with that name,
* it is a conflict, *unless* it is in skip.
*/
pos = search_ref_dir(dir, refname, slash - refname);
pos = search_ref_dir(dir, dirname.buf, dirname.len);
if (pos >= 0) {
/*
* We found a reference whose name is a proper
* prefix of refname; e.g., "refs/foo".
*/
struct ref_entry *entry = dir->entries[pos];
if (skip && string_list_has_string(skip, entry->name)) {
if (skip && string_list_has_string(skip, dirname.buf)) {
/*
* The reference we just found, e.g.,
* "refs/foo", is also in skip, so it
@ -910,10 +914,11 @@ static int is_refname_available(const char *refname,
* "refs/foo"). So we can stop looking
* now and return true.
*/
return 1;
ret = 1;
goto cleanup;
}
error("'%s' exists; cannot create '%s'", entry->name, refname);
return 0;
error("'%s' exists; cannot create '%s'", dirname.buf, refname);
goto cleanup;
}
@ -922,14 +927,16 @@ static int is_refname_available(const char *refname,
* the next component. So try to look up the
* directory, e.g., "refs/foo/".
*/
pos = search_ref_dir(dir, refname, slash + 1 - refname);
strbuf_addch(&dirname, '/');
pos = search_ref_dir(dir, dirname.buf, dirname.len);
if (pos < 0) {
/*
* There was no directory "refs/foo/", so
* there is nothing under this whole prefix,
* and we are OK.
*/
return 1;
ret = 1;
goto cleanup;
}
dir = get_ref_dir(dir->entries[pos]);
@ -943,10 +950,9 @@ static int is_refname_available(const char *refname,
* names are in the "refs/foo/bar/" namespace, because they
* *do* conflict.
*/
strbuf_addstr(&dirname, refname);
strbuf_addstr(&dirname, refname + dirname.len);
strbuf_addch(&dirname, '/');
pos = search_ref_dir(dir, dirname.buf, dirname.len);
strbuf_release(&dirname);
if (pos >= 0) {
/*
@ -960,15 +966,21 @@ static int is_refname_available(const char *refname,
dir = get_ref_dir(entry);
data.skip = skip;
sort_ref_dir(dir);
if (!do_for_each_entry_in_dir(dir, 0, nonmatching_ref_fn, &data))
return 1;
if (!do_for_each_entry_in_dir(dir, 0, nonmatching_ref_fn, &data)) {
ret = 1;
goto cleanup;
}
error("'%s' exists; cannot create '%s'",
data.conflicting_refname, refname);
return 0;
goto cleanup;
}
return 1;
ret = 1;
cleanup:
strbuf_release(&dirname);
return ret;
}
struct packed_ref_cache {