71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
/* $Id$ */
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/*
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* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
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*
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* This product is part of the Amsterdam Compiler Kit.
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*
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* Permission to use, sell, duplicate or disclose this software must be
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* obtained in writing. Requests for such permissions may be sent to
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*
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* Dr. Andrew S. Tanenbaum
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* Wiskundig Seminarium
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* Vrije Universiteit
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* Postbox 7161
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* 1007 MC Amsterdam
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* The Netherlands
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*
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*/
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/* Author: J.W. Stevenson */
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#include "pc.h"
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#define assert(x) /* nothing */
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#if __STDC__
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#include <float.h>
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#define HUGE_DIG DBL_MAX_10_EXP /* log10(maxreal) */
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#else
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#define HUGE_DIG 400 /* log10(maxreal) */
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#endif
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#define PREC_DIG 80 /* the maximum digits returned by _fcvt() */
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#define FILL_CHAR '0' /* char printed if all of _fcvt() used */
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#define BUFSIZE HUGE_DIG + PREC_DIG + 3
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void _wrf(int n, int w, double r, struct file* f)
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{
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char *p, *b;
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int s, d;
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char buf[BUFSIZE];
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if (n < 0 || w < 0)
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_trp(EWIDTH);
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p = buf;
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if (n > PREC_DIG)
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n = PREC_DIG;
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b = _fcvt(r, n, &d, &s);
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assert(abs(d) <= HUGE_DIG);
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if (s)
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*p++ = '-';
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if (d <= 0)
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*p++ = '0';
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else
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do
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*p++ = (*b ? *b++ : FILL_CHAR);
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while (--d > 0);
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if (n > 0)
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*p++ = '.';
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while (++d <= 0)
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{
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if (--n < 0)
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break;
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*p++ = '0';
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}
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while (--n >= 0)
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{
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*p++ = (*b ? *b++ : FILL_CHAR);
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assert(p <= buf + BUFSIZE);
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}
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_wstrin(w, (int)(p - buf), buf, f);
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}
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