64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
/* $Header$ */
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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_err.h>
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#include <pc_file.h>
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extern _wstrin();
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extern char *_fcvt();
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#define assert(x) /* nothing */
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#define HUGE_DIG 39 /* log10(maxreal) */
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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 + 2
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_wrf(n,w,r,f) int n,w; double r; struct file *f; {
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char *p,*b; int s,d; char buf[BUFSIZE];
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if ( n < 0 || w < 0) _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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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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*p++ = (*b ? *b++ : FILL_CHAR);
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assert(p <= buf+BUFSIZE);
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}
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_wstrin(w,p-buf,buf,f);
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}
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