89 static char *shell;  variable
236 	shell = getenv("SHELL");  in main()
237 	if(shell == 0 || !endsh(shell) || (  in main()
238 		!in_dir("/bin",shell) &&  in main()
239 		!in_dir("/usr/bin",shell) &&  in main()
240 		!in_dir("/usr/lbin",shell) &&  in main()
241 		!in_dir("/usr/local/bin",shell)))  in main()
242 			shell = DEFSHELL;  in main()
245 	execv(shell,argv);  in main()
253 static int endsh(register const char *shell)  in endsh()  argument
255 	while(*shell)  in endsh()
256 		shell++;  in endsh()
257 	if(*--shell != 'h' || *--shell != 's')  in endsh()
259 	if(*--shell=='/')  in endsh()
261 	if(*shell=='k' && *--shell=='/')  in endsh()
271 static int in_dir(register const char *dir,register const char *shell)  in in_dir()  argument
275 		if(*dir++ != *shell++)  in in_dir()
279 	return(*shell=='/');  in in_dir()