C++ xstrfmt函数代码示例

static struct complete_reflogs *read_complete_reflog(const char *ref)
{
	struct complete_reflogs *reflogs =
		xcalloc(1, sizeof(struct complete_reflogs));
	reflogs->ref = xstrdup(ref);
	for_each_reflog_ent(ref, read_one_reflog, reflogs);
	if (reflogs->nr == 0) {
		struct object_id oid;
		const char *name;
		void *name_to_free;
		name = name_to_free = resolve_refdup(ref, RESOLVE_REF_READING,
						     oid.hash, NULL);
		if (name) {
			for_each_reflog_ent(name, read_one_reflog, reflogs);
			free(name_to_free);
		}
	}
	if (reflogs->nr == 0) {
		char *refname = xstrfmt("refs/%s", ref);
		for_each_reflog_ent(refname, read_one_reflog, reflogs);
		if (reflogs->nr == 0) {
			free(refname);
			refname = xstrfmt("refs/heads/%s", ref);
			for_each_reflog_ent(refname, read_one_reflog, reflogs);
		}
		free(refname);
	}
	return reflogs;
}

static void name_rev(struct commit *commit,
		const char *tip_name, int generation, int distance,
		int deref)
{
	struct rev_name *name = (struct rev_name *)commit->util;
	struct commit_list *parents;
	int parent_number = 1;

	parse_commit(commit);

	if (commit->date < cutoff)
		return;

	if (deref) {
		tip_name = xstrfmt("%s^0", tip_name);

		if (generation)
			die("generation: %d, but deref?", generation);
	}

	if (name == NULL) {
		name = xmalloc(sizeof(rev_name));
		commit->util = name;
		goto copy_data;
	} else if (name->distance > distance) {
copy_data:
		name->tip_name = tip_name;
		name->generation = generation;
		name->distance = distance;
	} else
		return;

	for (parents = commit->parents;
			parents;
			parents = parents->next, parent_number++) {
		if (parent_number > 1) {
			size_t len;
			char *new_name;

			strip_suffix(tip_name, "^0", &len);
			if (generation > 0)
				new_name = xstrfmt("%.*s~%d^%d", (int)len, tip_name,
						   generation, parent_number);
			else
				new_name = xstrfmt("%.*s^%d", (int)len, tip_name,
						   parent_number);

			name_rev(parents->item, new_name, 0,
				distance + MERGE_TRAVERSAL_WEIGHT, 0);
		} else {
			name_rev(parents->item, tip_name, generation + 1,
				distance + 1, 0);
		}
	}
}

static int bisect_next_check(const struct bisect_terms *terms,
			     const char *current_term)
{
	int missing_good = 1, missing_bad = 1, retval = 0;
	const char *bad_ref = xstrfmt("refs/bisect/%s", terms->term_bad);
	const char *good_glob = xstrfmt("%s-*", terms->term_good);

	if (ref_exists(bad_ref))
		missing_bad = 0;

	for_each_glob_ref_in(mark_good, good_glob, "refs/bisect/",
			     (void *) &missing_good);

	if (!missing_good && !missing_bad)
		goto finish;

	if (!current_term) {
		retval = -1;
		goto finish;
	}

	if (missing_good && !missing_bad &&
	    !strcmp(current_term, terms->term_good)) {
		char *yesno;
		/*
		 * have bad (or new) but not good (or old). We could bisect
		 * although this is less optimum.
		 */
		warning(_("bisecting only with a %s commit"), terms->term_bad);
		if (!isatty(0))
			goto finish;
		/*
		 * TRANSLATORS: Make sure to include [Y] and [n] in your
		 * translation. The program will only accept English input
		 * at this point.
		 */
		yesno = git_prompt(_("Are you sure [Y/n]? "), PROMPT_ECHO);
		if (starts_with(yesno, "N") || starts_with(yesno, "n"))
			retval = -1;
		goto finish;
	}
	if (!is_empty_or_missing_file(git_path_bisect_start())) {
		retval = error(_(need_bad_and_good_revision_warning),
			       vocab_bad, vocab_good, vocab_bad, vocab_good);
	} else {
		retval = error(_(need_bisect_start_warning),
			       vocab_good, vocab_bad, vocab_good, vocab_bad);
	}

finish:
	free((void *) good_glob);
	free((void *) bad_ref);
	return retval;
}

static int check_term_format(const char *term, const char *orig_term)
{
	int res;
	char *new_term = xstrfmt("refs/bisect/%s", term);

	res = check_refname_format(new_term, 0);
	free(new_term);

	if (res)
		return error(_("'%s' is not a valid term"), term);

	if (one_of(term, "help", "start", "skip", "next", "reset",
			"visualize", "view", "replay", "log", "run", "terms", NULL))
		return error(_("can't use the builtin command '%s' as a term"), term);

	/*
	 * In theory, nothing prevents swapping completely good and bad,
	 * but this situation could be confusing and hasn't been tested
	 * enough. Forbid it for now.
	 */

	if ((strcmp(orig_term, "bad") && one_of(term, "bad", "new", NULL)) ||
		 (strcmp(orig_term, "good") && one_of(term, "good", "old", NULL)))
		return error(_("can't change the meaning of the term '%s'"), term);

	return 0;
}

/*
 * Normalize "path", prepending the "prefix" for relative paths. If
 * remaining_prefix is not NULL, return the actual prefix still
 * remains in the path. For example, prefix = sub1/sub2/ and path is
 *
 *  foo          -> sub1/sub2/foo  (full prefix)
 *  ../foo       -> sub1/foo       (remaining prefix is sub1/)
 *  ../../bar    -> bar            (no remaining prefix)
 *  ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
 *  `pwd`/../bar -> sub1/bar       (no remaining prefix)
 */
char *prefix_path_gently(const char *prefix, int len,
			 int *remaining_prefix, const char *path)
{
	const char *orig = path;
	char *sanitized;
	if (is_absolute_path(orig)) {
		sanitized = xmalloc(strlen(path) + 1);
		if (remaining_prefix)
			*remaining_prefix = 0;
		if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
			free(sanitized);
			return NULL;
		}
		if (abspath_part_inside_repo(sanitized)) {
			free(sanitized);
			return NULL;
		}
	} else {
		sanitized = xstrfmt("%.*s%s", len, prefix, path);
		if (remaining_prefix)
			*remaining_prefix = len;
		if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
			free(sanitized);
			return NULL;
		}
	}
	return sanitized;
}

static int list_tags(struct ref_filter *filter, struct ref_sorting *sorting, const char *format)
{
	struct ref_array array;
	char *to_free = NULL;
	int i;

	memset(&array, 0, sizeof(array));

	if (filter->lines == -1)
		filter->lines = 0;

	if (!format) {
		if (filter->lines) {
			to_free = xstrfmt("%s %%(contents:lines=%d)",
					  "%(align:15)%(refname:strip=2)%(end)",
					  filter->lines);
			format = to_free;
		} else
			format = "%(refname:strip=2)";
	}

	verify_ref_format(format);
	filter->with_commit_tag_algo = 1;
	filter_refs(&array, filter, FILTER_REFS_TAGS);
	ref_array_sort(sorting, &array);

	for (i = 0; i < array.nr; i++)
		show_ref_array_item(array.items[i], format, 0);
	ref_array_clear(&array);
	free(to_free);

	return 0;
}

static int get_message(struct commit *commit, struct commit_message *out)
{
	const char *abbrev, *subject;
	int subject_len;

	out->message = logmsg_reencode(commit, NULL, get_commit_output_encoding());
	abbrev = find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV);

	subject_len = find_commit_subject(out->message, &subject);

	out->subject = xmemdupz(subject, subject_len);
	out->label = xstrfmt("%s... %s", abbrev, out->subject);
	out->parent_label = xstrfmt("parent of %s", out->label);

	return 0;
}

static void fetch_symref(const char *path, char **symref, struct object_id *oid)
{
	char *url = xstrfmt("%s%s", repo->url, path);
	struct strbuf buffer = STRBUF_INIT;
	const char *name;

	if (http_get_strbuf(url, &buffer, NULL) != HTTP_OK)
		die("Couldn't get %s for remote symref\n%s", url,
		    curl_errorstr);
	free(url);

	FREE_AND_NULL(*symref);
	oidclr(oid);

	if (buffer.len == 0)
		return;

	/* Cut off trailing newline. */
	strbuf_rtrim(&buffer);

	/* If it's a symref, set the refname; otherwise try for a sha1 */
	if (skip_prefix(buffer.buf, "ref: ", &name)) {
		*symref = xmemdupz(name, buffer.len - (name - buffer.buf));
	} else {
		get_oid_hex(buffer.buf, oid);
	}

	strbuf_release(&buffer);
}

static void name_rev(struct commit *commit,
		const char *tip_name, int generation, int distance,
		int deref)
{
	struct rev_name *name = (struct rev_name *)commit->util;
	struct commit_list *parents;
	int parent_number = 1;

	parse_commit(commit);

	if (commit->date < cutoff)
		return;

	if (deref) {
		tip_name = xstrfmt("%s^0", tip_name);

		if (generation)
			die("generation: %d, but deref?", generation);
	}

	if (name == NULL) {
		name = xmalloc(sizeof(rev_name));
		commit->util = name;
		goto copy_data;
	} else if (name->distance > distance) {
copy_data:
		name->tip_name = tip_name;
		name->generation = generation;
		name->distance = distance;
	} else
		return;

	for (parents = commit->parents;
			parents;
			parents = parents->next, parent_number++) {
		if (parent_number > 1) {
			int len = strlen(tip_name);
			char *new_name = xmalloc(len +
				1 + decimal_length(generation) +  /* ~<n> */
				1 + 2 +				  /* ^NN */
				1);

			if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
				len -= 2;
			if (generation > 0)
				sprintf(new_name, "%.*s~%d^%d", len, tip_name,
						generation, parent_number);
			else
				sprintf(new_name, "%.*s^%d", len, tip_name,
						parent_number);

			name_rev(parents->item, new_name, 0,
				distance + MERGE_TRAVERSAL_WEIGHT, 0);
		} else {
			name_rev(parents->item, tip_name, generation + 1,
				distance + 1, 0);
		}
	}
}

void setup_unpack_trees_porcelain(struct unpack_trees_options *opts,
				  const char *cmd)
{
	int i;
	const char **msgs = opts->msgs;
	const char *msg;
	const char *cmd2 = strcmp(cmd, "checkout") ? cmd : "switch branches";

	if (advice_commit_before_merge)
		msg = "Your local changes to the following files would be overwritten by %s:\n%%s"
			"Please, commit your changes or stash them before you can %s.";
	else
		msg = "Your local changes to the following files would be overwritten by %s:\n%%s";
	msgs[ERROR_WOULD_OVERWRITE] = msgs[ERROR_NOT_UPTODATE_FILE] =
		xstrfmt(msg, cmd, cmd2);

	msgs[ERROR_NOT_UPTODATE_DIR] =
		"Updating the following directories would lose untracked files in it:\n%s";

	if (advice_commit_before_merge)
		msg = "The following untracked working tree files would be %s by %s:\n%%s"
			"Please move or remove them before you can %s.";
	else
		msg = "The following untracked working tree files would be %s by %s:\n%%s";

	msgs[ERROR_WOULD_LOSE_UNTRACKED_REMOVED] = xstrfmt(msg, "removed", cmd, cmd2);
	msgs[ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN] = xstrfmt(msg, "overwritten", cmd, cmd2);

	/*
	 * Special case: ERROR_BIND_OVERLAP refers to a pair of paths, we
	 * cannot easily display it as a list.
	 */
	msgs[ERROR_BIND_OVERLAP] = "Entry '%s' overlaps with '%s'.  Cannot bind.";

	msgs[ERROR_SPARSE_NOT_UPTODATE_FILE] =
		"Cannot update sparse checkout: the following entries are not up-to-date:\n%s";
	msgs[ERROR_WOULD_LOSE_ORPHANED_OVERWRITTEN] =
		"The following Working tree files would be overwritten by sparse checkout update:\n%s";
	msgs[ERROR_WOULD_LOSE_ORPHANED_REMOVED] =
		"The following Working tree files would be removed by sparse checkout update:\n%s";

	opts->show_all_errors = 1;
	/* rejected paths may not have a static buffer */
	for (i = 0; i < ARRAY_SIZE(opts->unpack_rejects); i++)
		opts->unpack_rejects[i].strdup_strings = 1;
}

static void expand_base_dir(char **out, const char *in,
			    const char *base_dir, const char *def_in)
{
	free(*out);
	if (in)
		*out = xstrdup(in);
	else
		*out = xstrfmt("%s/%s", base_dir, def_in);
}

static char *git_path_from_env(const char *envvar, const char *git_dir,
			       const char *path, int fromenv)
{
	if (fromenv) {
		const char *value = getenv(envvar);
		if (value)
			return xstrdup(value);
	}

	return xstrfmt("%s/%s", git_dir, path);
}

static void show_datestring(const char *flag, const char *datestr)
{
	char *buffer;

	/* date handling requires both flags and revs */
	if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
		return;
	buffer = xstrfmt("%s%"PRItime, flag, approxidate(datestr));
	show(buffer);
	free(buffer);
}

const char *unique_tracking_name(const char *name, struct object_id *oid)
{
	struct tracking_name_data cb_data = { NULL, NULL, NULL, 1 };
	cb_data.src_ref = xstrfmt("refs/heads/%s", name);
	cb_data.dst_oid = oid;
	for_each_remote(check_tracking_name, &cb_data);
	free(cb_data.src_ref);
	if (cb_data.unique)
		return cb_data.dst_ref;
	free(cb_data.dst_ref);
	return NULL;
}

static char *get_socket_path(void)
{
	struct stat sb;
	char *old_dir, *socket;
	old_dir = expand_user_path("~/.git-credential-cache", 0);
	if (old_dir && !stat(old_dir, &sb) && S_ISDIR(sb.st_mode))
		socket = xstrfmt("%s/socket", old_dir);
	else
		socket = xdg_cache_home("credential/socket");
	free(old_dir);
	return socket;
}