OpenCores
URL https://opencores.org/ocsvn/or1k/or1k/trunk

Subversion Repositories or1k

[/] [or1k/] [trunk/] [insight/] [libiberty/] [strtod.c] - Blame information for rev 1765

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 578 markom
/* Implementation of strtod for systems with atof.
2
   Copyright (C) 1991, 1995 Free Software Foundation, Inc.
3
 
4
This file is part of the libiberty library.  This library is free
5
software; you can redistribute it and/or modify it under the
6
terms of the GNU General Public License as published by the
7
Free Software Foundation; either version 2, or (at your option)
8
any later version.
9
 
10
This library is distributed in the hope that it will be useful,
11
but WITHOUT ANY WARRANTY; without even the implied warranty of
12
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13
GNU General Public License for more details.
14
 
15
You should have received a copy of the GNU General Public License
16
along with GNU CC; see the file COPYING.  If not, write to
17
the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18
 
19
As a special exception, if you link this library with files
20
compiled with a GNU compiler to produce an executable, this does not cause
21
the resulting executable to be covered by the GNU General Public License.
22
This exception does not however invalidate any other reasons why
23
the executable file might be covered by the GNU General Public License. */
24
 
25
#include "ansidecl.h"
26
#include "safe-ctype.h"
27
 
28
extern double atof ();
29
 
30
/* Disclaimer: this is currently just used by CHILL in GDB and therefore
31
   has not been tested well.  It may have been tested for nothing except
32
   that it compiles.  */
33
 
34
double
35
strtod (str, ptr)
36
     char *str;
37
     char **ptr;
38
{
39
  char *p;
40
 
41
  if (ptr == (char **)0)
42
    return atof (str);
43
 
44
  p = str;
45
 
46
  while (ISSPACE (*p))
47
    ++p;
48
 
49
  if (*p == '+' || *p == '-')
50
    ++p;
51
 
52
  /* INF or INFINITY.  */
53
  if ((p[0] == 'i' || p[0] == 'I')
54
      && (p[1] == 'n' || p[1] == 'N')
55
      && (p[2] == 'f' || p[2] == 'F'))
56
    {
57
      if ((p[3] == 'i' || p[3] == 'I')
58
          && (p[4] == 'n' || p[4] == 'N')
59
          && (p[5] == 'i' || p[5] == 'I')
60
          && (p[6] == 't' || p[6] == 'T')
61
          && (p[7] == 'y' || p[7] == 'Y'))
62
        {
63
          *ptr = p + 7;
64
          return atof (str);
65
        }
66
      else
67
        {
68
          *ptr = p + 3;
69
          return atof (str);
70
        }
71
    }
72
 
73
  /* NAN or NAN(foo).  */
74
  if ((p[0] == 'n' || p[0] == 'N')
75
      && (p[1] == 'a' || p[1] == 'A')
76
      && (p[2] == 'n' || p[2] == 'N'))
77
    {
78
      p += 3;
79
      if (*p == '(')
80
        {
81
          ++p;
82
          while (*p != '\0' && *p != ')')
83
            ++p;
84
          if (*p == ')')
85
            ++p;
86
        }
87
      *ptr = p;
88
      return atof (str);
89
    }
90
 
91
  /* digits, with 0 or 1 periods in it.  */
92
  if (ISDIGIT (*p) || *p == '.')
93
    {
94
      int got_dot = 0;
95
      while (ISDIGIT (*p) || (!got_dot && *p == '.'))
96
        {
97
          if (*p == '.')
98
            got_dot = 1;
99
          ++p;
100
        }
101
 
102
      /* Exponent.  */
103
      if (*p == 'e' || *p == 'E')
104
        {
105
          int i;
106
          i = 1;
107
          if (p[i] == '+' || p[i] == '-')
108
            ++i;
109
          if (ISDIGIT (p[i]))
110
            {
111
              while (ISDIGIT (p[i]))
112
                ++i;
113
              *ptr = p + i;
114
              return atof (str);
115
            }
116
        }
117
      *ptr = p;
118
      return atof (str);
119
    }
120
  /* Didn't find any digits.  Doesn't look like a number.  */
121
  *ptr = str;
122
  return 0.0;
123
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.