source: trunk/minix/lib/ack/libp/wrf.c@ 9

/* $Header: /cvsup/minix/src/lib/ack/libp/wrf.c,v 1.1 2005/10/10 15:27:47 beng Exp $ */
/*
 * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
 *
 *          This product is part of the Amsterdam Compiler Kit.
 *
 * Permission to use, sell, duplicate or disclose this software must be
 * obtained in writing. Requests for such permissions may be sent to
 *
 *      Dr. Andrew S. Tanenbaum
 *      Wiskundig Seminarium
 *      Vrije Universiteit
 *      Postbox 7161
 *      1007 MC Amsterdam
 *      The Netherlands
 *
 */

/* Author: J.W. Stevenson */

#include        <pc_err.h>
#include        <pc_file.h>

extern          _wstrin();
extern char     *_fcvt();

#define assert(x)       /* nothing */

#if __STDC__
#include <float.h>
#define HUGE_DIG        DBL_MAX_10_EXP  /* log10(maxreal) */
#else
#define HUGE_DIG        400     /* log10(maxreal) */
#endif
#define PREC_DIG        80      /* the maximum digits returned by _fcvt() */
#define FILL_CHAR       '0'     /* char printed if all of _fcvt() used */
#define BUFSIZE         HUGE_DIG + PREC_DIG + 3

_wrf(n,w,r,f) int n,w; double r; struct file *f; {
        char *p,*b; int s,d; char buf[BUFSIZE];

        if ( n < 0 || w < 0) _trp(EWIDTH);
        p = buf;
        if (n > PREC_DIG)
                n = PREC_DIG;
        b = _fcvt(r,n,&d,&s);
        assert(abs(d) <= HUGE_DIG);
        if (s)
                *p++ = '-';
        if (d<=0)
                *p++ = '0';
        else
                do
                        *p++ = (*b ? *b++ : FILL_CHAR);
                while (--d > 0);
        if (n > 0)
                *p++ = '.';
        while (++d <= 0) {
                if (--n < 0)
                        break;
                *p++ = '0';
        }
        while (--n >= 0) {
                *p++ = (*b ? *b++ : FILL_CHAR);
                assert(p <= buf+BUFSIZE);
        }
        _wstrin(w,(int)(p-buf),buf,f);
}