exptilde
STATIC const char *exptilde(const char *, int);
p = exptilde(p, flag);
p = exptilde(p, flag);
char *exptilde(char [], char *);
if (exptilde(target, name) == NULL)
if (exptilde(target, cp) == NULL)
if (exptilde(buf, cp) == NULL)
rname = exptilde(target, src);