static inthex2int(char c){	if (c >= '0' && c <= '9')		return c - '0';	else if (c >= 'a' && c <= 'f')		return c - 'a' + 10;	else if (c >= 'A' && c <= 'F')		return c - 'A' + 10;	else		return -1;} intosc7parsecwd(const char *uri){	const char *auth, *host, *hostend;	char *path, decoded[PATH_MAX], thishost[_POSIX_HOST_NAME_MAX];	size_t i, decodedlen, hostlen, urilen;	int h1, h2;	if (!term.cwd) {		term.cwd = xmalloc(sizeof(decoded));		term.cwd[0] = '\0';	}	/* reset cwd if uri is empty */	if ((urilen = strlen(uri)) == 0) {		term.cwd[0] = '\0';		return 1;	}	/* decode uri */	for (decodedlen = 0, i = 0; i < urilen; i++) {		if (uri[i] == '%' && i <= urilen-3 &&		    (h1 = hex2int(uri[i+1])) >= 0 && (h2 = hex2int(uri[i+2])) >= 0) {			decoded[decodedlen++] = (h1 << 4) | h2;			i += 2;		} else {			decoded[decodedlen++] = uri[i];		}		if (decodedlen == sizeof(decoded)) {			fprintf(stderr, "erresc (OSC 7): uri is too long\n");			return 0;		}	}	decoded[decodedlen] = '\0';	/* check scheme */	if (decodedlen < 5 || strncmp("file:", decoded, 5) != 0) {		fprintf(stderr, "erresc (OSC 7): scheme is not supported: '%s'\n", uri);		return 0;	}	/* find start of authority */	if (decodedlen < 7 || decoded[5] != '/' || decoded[6] != '/') {		fprintf(stderr, "erresc (OSC 7): invalid uri: '%s'\n", uri);		return 0;	}	auth = decoded + 7;	/* find start of path and reset cwd if path is missing */	if ((path = strchr(auth, '/')) == NULL) {		term.cwd[0] = '\0';		return 1;	}	/* ignore path if host is not localhost */	host = ((host = memchr(auth, '@', path - auth)) != NULL) ? host+1 : auth;	hostend = ((hostend = memchr(host, ':', path - host)) != NULL) ? hostend : path;	hostlen = hostend - host;	if (gethostname(thishost, sizeof(thishost)) < 0)		thishost[0] = '\0';	if (hostlen > 0 &&	    !(hostlen == 9 && strncmp("localhost", host, hostlen) == 0) &&	    !(hostlen == strlen(thishost) && strncmp(host, thishost, hostlen) == 0)) {		return 0;	}	memcpy(term.cwd, path, decodedlen - (path - decoded) + 1);	return 1;}