usr/src/lib/libbc/libc/gen/common/strtod.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) 1987 by Sun Microsystems, Inc.
  26  */
  27
  28 #include <errno.h>
  29 #include <stdio.h>
  30 #include <values.h>
  31 #include <floatingpoint.h>
  32
  33 double
  34 strtod(cp, ptr)
  35         char           *cp;
  36         char          **ptr;
  37 {
  38         double          x;
  39         decimal_mode    mr;
  40         decimal_record  dr;
  41         fp_exception_field_type fs;
  42         enum decimal_string_form form;
  43         char           *pechar;
  44
  45         string_to_decimal(&cp, MAXINT, 0, &dr, &form, &pechar);
  46         if (ptr != (char **) NULL)
  47                 *ptr = cp;
  48         if (form == invalid_form)
  49                 return 0.0;     /* Shameful kluge for SVID's sake. */
  50         mr.rd = fp_direction;
  51         decimal_to_double(&x, &mr, &dr, &fs);
  52         if (fs & (1 << fp_overflow)) {  /* Overflow. */
  53                 errno = ERANGE;
  54         }
  55         if (fs & (1 << fp_underflow)) { /* underflow */
  56                 errno = ERANGE;
  57         }
  58         return x;
  59 }