Function expand_to_path

sparse-index.c:693–755

static int in_expand_to_path = 0;

void expand_to_path(struct index_state *istate,
		    const char *path, size_t pathlen, int icase)
{
	struct strbuf path_mutable = STRBUF_INIT;
	size_t substr_len;

	/* prevent extra recursion */
	if (in_expand_to_path)
		return;

	if (!istate->sparse_index)
		return;

	in_expand_to_path = 1;

	/*
	 * We only need to actually expand a region if the
	 * following are both true:
	 *
	 * 1. 'path' is not already in the index.
	 * 2. Some parent directory of 'path' is a sparse directory.
	 */

	if (index_file_exists(istate, path, pathlen, icase))
		goto cleanup;

	strbuf_add(&path_mutable, path, pathlen);
	strbuf_addch(&path_mutable, '/');

	/* Check the name hash for all parent directories */
	substr_len = 0;
	while (substr_len < pathlen) {
		char temp;
		char *replace = strchr(path_mutable.buf + substr_len, '/');

		if (!replace)
			break;

		/* replace the character _after_ the slash */
		replace++;
		temp = *replace;
		*replace = '\0';
		substr_len = replace - path_mutable.buf;
		if (index_file_exists(istate, path_mutable.buf,
				      substr_len, icase)) {
			/*
			 * We found a parent directory in the name-hash
			 * hashtable, because only sparse directory entries
			 * have a trailing '/' character.  Since "path" wasn't
			 * in the index, perhaps it exists within this
			 * sparse-directory.  Expand accordingly.
			 */
			ensure_full_index(istate);
			break;
		}

		*replace = temp;
	}