g_dfmt
g_dfmt(char *buf, double *d, int ndig, size_t bufsize)
extern char* g_dfmt ANSI((char*, double*, int, size_t));
g_dfmt(buf, &d, 0, sizeof(buf));
g_dfmt(buf,&d,0,sizeof(buf));
se = g_dfmt(obuf, &u.f, ndig, sizeof(obuf));