hex.c revision 130562 
1/* Hex character manipulation support.
2   Copyright (C) 1995, 2001 Free Software Foundation, Inc.
3
4This file is part of the libiberty library.
5Libiberty is free software; you can redistribute it and/or
6modify it under the terms of the GNU Library General Public
7License as published by the Free Software Foundation; either
8version 2 of the License, or (at your option) any later version.
9
10Libiberty is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13Library General Public License for more details.
14
15You should have received a copy of the GNU Library General Public
16License along with libiberty; see the file COPYING.LIB.  If
17not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18Boston, MA 02111-1307, USA.  */
19
20#include <stdio.h>  /* for EOF */
21#include "libiberty.h"
22#include "safe-ctype.h" /* for HOST_CHARSET_ASCII */
23
24#if EOF != -1
25 #error "hex.c requires EOF == -1"
26#endif
27
28/*
29
30@deftypefn Extension void hex_init (void)
31
32Initializes the array mapping the current character set to
33corresponding hex values.  This function must be called before any
34call to @code{hex_p} or @code{hex_value}.  If you fail to call it, a
35default ASCII-based table will normally be used on ASCII systems.
36
37@end deftypefn
38
39@deftypefn Extension int hex_p (int @var{c})
40
41Evaluates to non-zero if the given character is a valid hex character,
42or zero if it is not.  Note that the value you pass will be cast to
43@code{unsigned char} within the macro.
44
45@end deftypefn
46
47@deftypefn Extension unsigned int hex_value (int @var{c})
48
49Returns the numeric equivalent of the given character when interpreted
50as a hexidecimal digit.  The result is undefined if you pass an
51invalid hex digit.  Note that the value you pass will be cast to
52@code{unsigned char} within the macro.
53
54The @code{hex_value} macro returns @code{unsigned int}, rather than
55signed @code{int}, to make it easier to use in parsing addresses from
56hex dump files: a signed @code{int} would be sign-extended when
57converted to a wider unsigned type --- like @code{bfd_vma}, on some
58systems.
59
60@end deftypefn
61
62@undocumented _hex_array_size
63@undocumented _hex_bad
64@undocumented _hex_value
65
66*/
67
68
69/* Are we ASCII? */
70#if HOST_CHARSET == HOST_CHARSET_ASCII
71
72const unsigned char _hex_value[_hex_array_size] =
73{
74  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* NUL SOH STX ETX */
75  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* EOT ENQ ACK BEL */
76  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* BS  HT  LF  VT  */
77  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* FF  CR  SO  SI  */
78  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* DLE DC1 DC2 DC3 */
79  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* DC4 NAK SYN ETB */
80  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* CAN EM  SUB ESC */
81  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* FS  GS  RS  US  */
82
83  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* SP  !   "   #   */
84  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* $   %   &   '   */
85  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* (   )   *   +   */
86  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* ,   -   .   /   */
87  0,        1,        2,        3,          /* 0   1   2   3   */
88  4,        5,        6,        7,          /* 4   5   6   7   */
89  8,        9,        _hex_bad, _hex_bad,   /* 8   9   :   ;   */
90  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* <   =   >   ?   */
91
92  _hex_bad, 10,       11,       12,         /* @   A   B   C   */
93  13,       14,       15,       _hex_bad,   /* D   E   F   G   */
94  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* H   I   J   K   */
95  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* L   M   N   O   */
96  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* P   Q   R   S   */
97  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* T   U   V   W   */
98  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* X   Y   Z   [   */
99  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* \   ]   ^   _   */
100
101  _hex_bad, 10,       11,       12,         /* `   a   b   c   */
102  13,       14,       15,       _hex_bad,   /* d   e   f   g   */
103  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* h   i   j   k   */
104  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* l   m   n   o   */
105  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* p   q   r   s   */
106  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* t   u   v   w   */
107  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* x   y   z   {   */
108  _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* |   }   ~   DEL */
109
110  /* The high half of unsigned char, all values are _hex_bad.  */
111  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
112  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
113  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
114  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
115  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
116  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
117  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
118  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
119
120  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
121  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
122  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
123  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
124  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
125  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
126  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
127  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
128
129  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
130  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
131  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
132  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
133  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
134  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
135  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
136  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
137
138  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
139  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
140  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
141  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
142  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
143  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
144  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
145  _hex_bad, _hex_bad, _hex_bad, _hex_bad,
146};
147#define HEX_TABLE_INITIALIZED
148
149#else
150
151unsigned char _hex_value[_hex_array_size];
152
153#endif /* not ASCII */
154
155void
156hex_init ()
157{
158#ifndef HEX_TABLE_INITIALIZED
159  int i;
160
161  for (i=0; i<_hex_array_size; i++)
162    {
163      switch (i)
164	{
165	case '0': _hex_value[i] = 0; break;
166	case '1': _hex_value[i] = 1; break;
167	case '2': _hex_value[i] = 2; break;
168	case '3': _hex_value[i] = 3; break;
169	case '4': _hex_value[i] = 4; break;
170	case '5': _hex_value[i] = 5; break;
171	case '6': _hex_value[i] = 6; break;
172	case '7': _hex_value[i] = 7; break;
173	case '8': _hex_value[i] = 8; break;
174	case '9': _hex_value[i] = 9; break;
175
176	case 'a': case 'A': _hex_value[i] = 10; break;
177	case 'b': case 'B': _hex_value[i] = 11; break;
178	case 'c': case 'C': _hex_value[i] = 12; break;
179	case 'd': case 'D': _hex_value[i] = 13; break;
180	case 'e': case 'E': _hex_value[i] = 14; break;
181	case 'f': case 'F': _hex_value[i] = 15; break;
182
183	default:
184	  _hex_value[i] = _hex_bad;
185	  break;
186	}
187    }
188#endif
189}
190