fetchstring
string = fetchstring(pri, arg, PATH_MAX);
if ((s = fetchstring(pri, offset, PATH_MAX)) != NULL) {
s = fetchstring(pri, addr,
char *s = raw? NULL : fetchstring(pri, (long)val, PATH_MAX);
fetchstring(pri, (long)val, PATH_MAX);
fetchstring(pri, (long)val,
extern char *fetchstring(private_t *, long, int);