| 1 | /* Hex character manipulation support. |
| 2 | Copyright (C) 1995, 2001 Free Software Foundation, Inc. |
| 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., 51 Franklin Street - Fifth Floor, |
| 18 | Boston, MA 02110-1301, USA. */ |
| 19 | |
| 20 | #include <stdio.h> /* for EOF */ |
| 21 | #ifdef HAVE_CONFIG_H |
| 22 | #include "config.h" |
| 23 | #endif |
| 24 | #include "libiberty.h" |
| 25 | #include "safe-ctype.h" /* for HOST_CHARSET_ASCII */ |
| 26 | |
| 27 | #if EOF != -1 |
| 28 | #error "hex.c requires EOF == -1" |
| 29 | #endif |
| 30 | |
| 31 | /* |
| 32 | |
| 33 | @deftypefn Extension void hex_init (void) |
| 34 | |
| 35 | Initializes the array mapping the current character set to |
| 36 | corresponding hex values. This function must be called before any |
| 37 | call to @code{hex_p} or @code{hex_value}. If you fail to call it, a |
| 38 | default ASCII-based table will normally be used on ASCII systems. |
| 39 | |
| 40 | @end deftypefn |
| 41 | |
| 42 | @deftypefn Extension int hex_p (int @var{c}) |
| 43 | |
| 44 | Evaluates to non-zero if the given character is a valid hex character, |
| 45 | or zero if it is not. Note that the value you pass will be cast to |
| 46 | @code{unsigned char} within the macro. |
| 47 | |
| 48 | @end deftypefn |
| 49 | |
| 50 | @deftypefn Extension {unsigned int} hex_value (int @var{c}) |
| 51 | |
| 52 | Returns the numeric equivalent of the given character when interpreted |
| 53 | as a hexadecimal digit. The result is undefined if you pass an |
| 54 | invalid hex digit. Note that the value you pass will be cast to |
| 55 | @code{unsigned char} within the macro. |
| 56 | |
| 57 | The @code{hex_value} macro returns @code{unsigned int}, rather than |
| 58 | signed @code{int}, to make it easier to use in parsing addresses from |
| 59 | hex dump files: a signed @code{int} would be sign-extended when |
| 60 | converted to a wider unsigned type --- like @code{bfd_vma}, on some |
| 61 | systems. |
| 62 | |
| 63 | @end deftypefn |
| 64 | |
| 65 | @undocumented _hex_array_size |
| 66 | @undocumented _hex_bad |
| 67 | @undocumented _hex_value |
| 68 | |
| 69 | */ |
| 70 | |
| 71 | |
| 72 | /* Are we ASCII? */ |
| 73 | #if HOST_CHARSET == HOST_CHARSET_ASCII |
| 74 | |
| 75 | const unsigned char _hex_value[_hex_array_size] = |
| 76 | { |
| 77 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* NUL SOH STX ETX */ |
| 78 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* EOT ENQ ACK BEL */ |
| 79 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* BS HT LF VT */ |
| 80 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* FF CR SO SI */ |
| 81 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* DLE DC1 DC2 DC3 */ |
| 82 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* DC4 NAK SYN ETB */ |
| 83 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* CAN EM SUB ESC */ |
| 84 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* FS GS RS US */ |
| 85 | |
| 86 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* SP ! " # */ |
| 87 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* $ % & ' */ |
| 88 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* ( ) * + */ |
| 89 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* , - . / */ |
| 90 | 0, 1, 2, 3, /* 0 1 2 3 */ |
| 91 | 4, 5, 6, 7, /* 4 5 6 7 */ |
| 92 | 8, 9, _hex_bad, _hex_bad, /* 8 9 : ; */ |
| 93 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* < = > ? */ |
| 94 | |
| 95 | _hex_bad, 10, 11, 12, /* @ A B C */ |
| 96 | 13, 14, 15, _hex_bad, /* D E F G */ |
| 97 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* H I J K */ |
| 98 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* L M N O */ |
| 99 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* P Q R S */ |
| 100 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* T U V W */ |
| 101 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* X Y Z [ */ |
| 102 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* \ ] ^ _ */ |
| 103 | |
| 104 | _hex_bad, 10, 11, 12, /* ` a b c */ |
| 105 | 13, 14, 15, _hex_bad, /* d e f g */ |
| 106 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* h i j k */ |
| 107 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* l m n o */ |
| 108 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* p q r s */ |
| 109 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* t u v w */ |
| 110 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* x y z { */ |
| 111 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* | } ~ DEL */ |
| 112 | |
| 113 | /* The high half of unsigned char, all values are _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 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 120 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 121 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 122 | |
| 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 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 129 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 130 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 131 | |
| 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 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 138 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 139 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 140 | |
| 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 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 147 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 148 | _hex_bad, _hex_bad, _hex_bad, _hex_bad, |
| 149 | }; |
| 150 | #define HEX_TABLE_INITIALIZED |
| 151 | |
| 152 | #else |
| 153 | |
| 154 | unsigned char _hex_value[_hex_array_size]; |
| 155 | |
| 156 | #endif /* not ASCII */ |
| 157 | |
| 158 | void |
| 159 | hex_init (void) |
| 160 | { |
| 161 | #ifndef HEX_TABLE_INITIALIZED |
| 162 | int i; |
| 163 | |
| 164 | for (i=0; i<_hex_array_size; i++) |
| 165 | { |
| 166 | switch (i) |
| 167 | { |
| 168 | case '0': _hex_value[i] = 0; break; |
| 169 | case '1': _hex_value[i] = 1; break; |
| 170 | case '2': _hex_value[i] = 2; break; |
| 171 | case '3': _hex_value[i] = 3; break; |
| 172 | case '4': _hex_value[i] = 4; break; |
| 173 | case '5': _hex_value[i] = 5; break; |
| 174 | case '6': _hex_value[i] = 6; break; |
| 175 | case '7': _hex_value[i] = 7; break; |
| 176 | case '8': _hex_value[i] = 8; break; |
| 177 | case '9': _hex_value[i] = 9; break; |
| 178 | |
| 179 | case 'a': case 'A': _hex_value[i] = 10; break; |
| 180 | case 'b': case 'B': _hex_value[i] = 11; break; |
| 181 | case 'c': case 'C': _hex_value[i] = 12; break; |
| 182 | case 'd': case 'D': _hex_value[i] = 13; break; |
| 183 | case 'e': case 'E': _hex_value[i] = 14; break; |
| 184 | case 'f': case 'F': _hex_value[i] = 15; break; |
| 185 | |
| 186 | default: |
| 187 | _hex_value[i] = _hex_bad; |
| 188 | break; |
| 189 | } |
| 190 | } |
| 191 | #endif |
| 192 | } |