stpcpy
char *stpcpy(char * __restrict, const char * __restrict);
# define yystpcpy stpcpy
p = stpcpy(p, sep);
p = stpcpy(p, gr->gr_mem[ndx]);
dst = stpcpy(dst, gr->gr_name) + 1;
dst = stpcpy(dst, gr->gr_passwd) + 1;
dst = stpcpy(dst, gr->gr_mem[i]) + 1;
dst = stpcpy(dst, name) + 1;
dst = stpcpy(npw->pw_name, pw->pw_name) + 1;
dst = stpcpy(npw->pw_passwd, pw->pw_passwd) + 1;
dst = stpcpy(npw->pw_class, pw->pw_class) + 1;
dst = stpcpy(npw->pw_gecos, pw->pw_gecos) + 1;
dst = stpcpy(npw->pw_dir, pw->pw_dir) + 1;
dst = stpcpy(npw->pw_shell, pw->pw_shell) + 1;