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[thirdparty/gcc.git] / libiberty / hex.c
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6599da04 1/* Hex character manipulation support.
26ad2982 2 Copyright (C) 1995, 2001 Free Software Foundation, Inc.
6599da04
JM		 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
26ad2982 20#include <stdio.h> /* for EOF */
6599da04 21#include "libiberty.h"
21299dbd
ZW		 22#include "safe-ctype.h" /* for HOST_CHARSET_ASCII */
23
24#if EOF != -1
25 #error "hex.c requires EOF == -1"
26#endif
6599da04 27
96adcacb
DD		 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
e8805990 47@deftypefn Extension {unsigned int} hex_value (int @var{c})
96adcacb
DD		 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
49a19cfd
JB		 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
96adcacb
DD		 60@end deftypefn
61
62@undocumented _hex_array_size
63@undocumented _hex_bad
64@undocumented _hex_value
65
66*/
67
e5969ba6 68
26ad2982 69/* Are we ASCII? */
21299dbd 70#if HOST_CHARSET == HOST_CHARSET_ASCII
6599da04 71
49a19cfd 72const unsigned char _hex_value[_hex_array_size] =
6599da04 73{
26ad2982
KG		 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};
96adcacb
DD		 147#define HEX_TABLE_INITIALIZED
148
26ad2982 149#else
96adcacb 150
49a19cfd 151unsigned char _hex_value[_hex_array_size];
96adcacb 152
26ad2982 153#endif /* not ASCII */
96adcacb
DD		 154
155void
6da879de 156hex_init (void)
96adcacb
DD		 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}
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