usr/src/lib/libpc/EXPO.c

/*-
 * Copyright (c) 1979 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. Neither the name of the University nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)EXPO.c      1.3 (Berkeley) 4/9/90";
#endif /* not lint */

long
EXPO(value)

        double  value;
{
        register int retval;
        register char *cp;
        char sign, buf[30];
        extern char *index();

        if (value == 0.0)
                return 0;
        sprintf(buf, "%.1e", value);
        cp = index(buf, 'e') + 1;
        sign = *cp++;
        retval = 0;
        while (*cp)
                retval = retval * 10 + *cp++ - '0';
        return sign == '-' ? -retval : retval;
}