hex.c revision 130561
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