usr/src/lib/libbc/libc/gen/common/seconvert.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 #pragma ident   "%Z%%M% %I%     %E% SMI"
  23
  24 /*
  25  * Copyright (c) 1988 by Sun Microsystems, Inc.
  26  */
  27
  28 #include "base_conversion.h"
  29
  30 char           *
  31 seconvert(arg, ndigits, decpt, sign, buf)
  32         single         *arg;
  33         int             ndigits, *decpt, *sign;
  34         char           *buf;
  35 {
  36         decimal_mode    dm;
  37         decimal_record  dr;
  38         fp_exception_field_type ef;
  39         int             i;
  40         static char     *nanstring = "NaN";
  41         static char     *infstring = "Infinity";
  42         char           *pc;
  43         int             nc;
  44
  45         dm.rd = fp_direction;   /* Rounding direction. */
  46         dm.df = floating_form;  /* E format. */
  47         dm.ndigits = ndigits;   /* Number of significant digits. */
  48         single_to_decimal(arg, &dm, &dr, &ef);
  49         *sign = dr.sign;
  50         switch (dr.fpclass) {
  51         case fp_normal:
  52         case fp_subnormal:
  53                 *decpt = dr.exponent + ndigits;
  54                 for (i = 0; i < ndigits; i++)
  55                         buf[i] = dr.ds[i];
  56                 buf[ndigits] = 0;
  57                 break;
  58         case fp_zero:
  59                 *decpt = 1;
  60                 for (i = 0; i < ndigits; i++)
  61                         buf[i] = '0';
  62                 buf[ndigits] = 0;
  63                 break;
  64         case fp_infinity:
  65                 *decpt = 0;
  66                 pc = infstring;
  67                 if (ndigits < 8)
  68                         nc = 3;
  69                 else
  70                         nc = 8;
  71                 goto movestring;
  72         case fp_quiet:
  73         case fp_signaling:
  74                 *decpt = 0;
  75                 pc = nanstring;
  76                 nc = 3;
  77 movestring:
  78                 for (i = 0; i < nc; i++)
  79                         buf[i] = pc[i];
  80                 buf[nc] = 0;
  81                 break;
  82         }
  83         return buf;             /* For compatibility with ecvt. */
  84 }
  85
  86 char           *
  87 sfconvert(arg, ndigits, decpt, sign, buf)
  88         single         *arg;
  89         int             ndigits, *decpt, *sign;
  90         char           *buf;
  91 {
  92         decimal_mode    dm;
  93         decimal_record  dr;
  94         fp_exception_field_type ef;
  95         int             i;
  96
  97         dm.rd = fp_direction;   /* Rounding direction. */
  98         dm.df = fixed_form;     /* F format. */
  99         dm.ndigits = ndigits;   /* Number of digits after point. */
 100         single_to_decimal(arg, &dm, &dr, &ef);
 101         *sign = dr.sign;
 102         switch (dr.fpclass) {
 103         case fp_normal:
 104         case fp_subnormal:
 105                 if (ndigits >= 0)
 106                         *decpt = dr.ndigits - ndigits;
 107                 else
 108                         *decpt = dr.ndigits;
 109                 for (i = 0; i < dr.ndigits; i++)
 110                         buf[i] = dr.ds[i];
 111                 buf[dr.ndigits] = 0;
 112                 break;
 113         case fp_zero:
 114                 *decpt = 0;
 115                 buf[0] = '0';
 116                 for (i = 1; i < ndigits; i++)
 117                         buf[i] = '0';
 118                 buf[i] = 0;
 119                 break;
 120         case fp_infinity:
 121                 *decpt = 0;
 122                 if (ndigits < 8)
 123                         buf = "Inf";
 124                 else
 125                         buf = "Infinity";
 126                 break;
 127         case fp_quiet:
 128         case fp_signaling:
 129                 *decpt = 0;
 130                 buf = "NaN";
 131                 break;
 132         }
 133         return buf;             /* For compatibility with fcvt. */
 134 }
 135
 136 extern void    _gcvt();
 137
 138 char           *
 139 sgconvert(number, ndigit, trailing, buf)
 140         single         *number;
 141         int             ndigit, trailing;
 142         char           *buf;
 143 {
 144         decimal_mode    dm;
 145         decimal_record  dr;
 146         fp_exception_field_type fef;
 147
 148         dm.rd = fp_direction;
 149         dm.df = floating_form;
 150         dm.ndigits = ndigit;
 151         single_to_decimal(number, &dm, &dr, &fef);
 152         _gcvt(ndigit, &dr, trailing, buf);
 153         return (buf);
 154 }