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252b5132 | 1 | /* Hex character manipulation support. |
d311a83a | 2 | Copyright (C) 1995, 2001 Free Software Foundation, Inc. |
252b5132 RH |
3 | |
4 | This file is part of the libiberty library. | |
5 | Libiberty is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2 of the License, or (at your option) any later version. | |
9 | ||
10 | Libiberty 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 GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with libiberty; see the file COPYING.LIB. If | |
17 | not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
d311a83a | 20 | #include <stdio.h> /* for EOF */ |
252b5132 | 21 | #include "libiberty.h" |
70ecf948 DD |
22 | #include "safe-ctype.h" /* for HOST_CHARSET_ASCII */ |
23 | ||
24 | #if EOF != -1 | |
25 | #error "hex.c requires EOF == -1" | |
26 | #endif | |
252b5132 | 27 | |
7dd4d42a DD |
28 | /* |
29 | ||
30 | @deftypefn Extension void hex_init (void) | |
31 | ||
32 | Initializes the array mapping the current character set to | |
33 | corresponding hex values. This function must be called before any | |
34 | call to @code{hex_p} or @code{hex_value}. If you fail to call it, a | |
35 | default 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 | ||
41 | Evaluates to non-zero if the given character is a valid hex character, | |
42 | or 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 | ||
e4f79046 | 47 | @deftypefn Extension unsigned int hex_value (int @var{c}) |
7dd4d42a DD |
48 | |
49 | Returns the numeric equivalent of the given character when interpreted | |
50 | as a hexidecimal digit. The result is undefined if you pass an | |
51 | invalid hex digit. Note that the value you pass will be cast to | |
52 | @code{unsigned char} within the macro. | |
53 | ||
e4f79046 JB |
54 | The @code{hex_value} macro returns @code{unsigned int}, rather than |
55 | signed @code{int}, to make it easier to use in parsing addresses from | |
56 | hex dump files: a signed @code{int} would be sign-extended when | |
57 | converted to a wider unsigned type --- like @code{bfd_vma}, on some | |
58 | systems. | |
59 | ||
7dd4d42a DD |
60 | @end deftypefn |
61 | ||
62 | @undocumented _hex_array_size | |
63 | @undocumented _hex_bad | |
64 | @undocumented _hex_value | |
65 | ||
66 | */ | |
67 | ||
d311a83a DD |
68 | |
69 | /* Are we ASCII? */ | |
70ecf948 | 70 | #if HOST_CHARSET == HOST_CHARSET_ASCII |
d311a83a | 71 | |
e4f79046 | 72 | const unsigned char _hex_value[_hex_array_size] = |
d311a83a DD |
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 | }; | |
7dd4d42a DD |
147 | #define HEX_TABLE_INITIALIZED |
148 | ||
d311a83a | 149 | #else |
7dd4d42a | 150 | |
e4f79046 | 151 | unsigned char _hex_value[_hex_array_size]; |
7dd4d42a | 152 | |
d311a83a | 153 | #endif /* not ASCII */ |
7dd4d42a DD |
154 | |
155 | void | |
156 | hex_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 | } |