Function strbuf_realpath_1

abspath.c:79–202

#define REALPATH_DIE_ON_ERROR (1 << 1)

static char *strbuf_realpath_1(struct strbuf *resolved, const char *path,
			       int flags)
{
	struct strbuf remaining = STRBUF_INIT;
	struct strbuf next = STRBUF_INIT;
	struct strbuf symlink = STRBUF_INIT;
	char *retval = NULL;
	int num_symlinks = 0;
	struct stat st;

	if (!*path) {
		if (flags & REALPATH_DIE_ON_ERROR)
			die("The empty string is not a valid path");
		else
			goto error_out;
	}

	strbuf_addstr(&remaining, path);
	get_root_part(resolved, &remaining);

	if (!resolved->len) {
		/* relative path; can use CWD as the initial resolved path */
		if (strbuf_getcwd(resolved)) {
			if (flags & REALPATH_DIE_ON_ERROR)
				die_errno("unable to get current working directory");
			else
				goto error_out;
		}
	}

	/* Iterate over the remaining path components */
	while (remaining.len > 0) {
		get_next_component(&next, &remaining);

		if (next.len == 0) {
			continue; /* empty component */
		} else if (next.len == 1 && !strcmp(next.buf, ".")) {
			continue; /* '.' component */
		} else if (next.len == 2 && !strcmp(next.buf, "..")) {
			/* '..' component; strip the last path component */
			strip_last_component(resolved);
			continue;
		}

		/* append the next component and resolve resultant path */
		if (!is_dir_sep(resolved->buf[resolved->len - 1]))
			strbuf_addch(resolved, '/');
		strbuf_addbuf(resolved, &next);

		if (lstat(resolved->buf, &st)) {
			/* error out unless this was the last component */
			if (errno != ENOENT ||
			   (!(flags & REALPATH_MANY_MISSING) && remaining.len)) {
				if (flags & REALPATH_DIE_ON_ERROR)
					die_errno("Invalid path '%s'",
						  resolved->buf);
				else
					goto error_out;