hex.c revision 104834
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 23/* 24 25@deftypefn Extension void hex_init (void) 26 27Initializes the array mapping the current character set to 28corresponding hex values. This function must be called before any 29call to @code{hex_p} or @code{hex_value}. If you fail to call it, a 30default ASCII-based table will normally be used on ASCII systems. 31 32@end deftypefn 33 34@deftypefn Extension int hex_p (int @var{c}) 35 36Evaluates to non-zero if the given character is a valid hex character, 37or zero if it is not. Note that the value you pass will be cast to 38@code{unsigned char} within the macro. 39 40@end deftypefn 41 42@deftypefn Extension int hex_value (int @var{c}) 43 44Returns the numeric equivalent of the given character when interpreted 45as a hexidecimal digit. The result is undefined if you pass an 46invalid hex digit. Note that the value you pass will be cast to 47@code{unsigned char} within the macro. 48 49@end deftypefn 50 51@undocumented _hex_array_size 52@undocumented _hex_bad 53@undocumented _hex_value 54 55*/ 56 57 58/* Are we ASCII? */ 59#if '\n' == 0x0A && ' ' == 0x20 && '0' == 0x30 \ 60 && 'A' == 0x41 && 'a' == 0x61 && '!' == 0x21 \ 61 && EOF == -1 62 63const char _hex_value[_hex_array_size] = 64{ 65 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* NUL SOH STX ETX */ 66 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* EOT ENQ ACK BEL */ 67 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* BS HT LF VT */ 68 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* FF CR SO SI */ 69 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* DLE DC1 DC2 DC3 */ 70 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* DC4 NAK SYN ETB */ 71 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* CAN EM SUB ESC */ 72 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* FS GS RS US */ 73 74 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* SP ! " # */ 75 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* $ % & ' */ 76 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* ( ) * + */ 77 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* , - . / */ 78 0, 1, 2, 3, /* 0 1 2 3 */ 79 4, 5, 6, 7, /* 4 5 6 7 */ 80 8, 9, _hex_bad, _hex_bad, /* 8 9 : ; */ 81 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* < = > ? */ 82 83 _hex_bad, 10, 11, 12, /* @ A B C */ 84 13, 14, 15, _hex_bad, /* D E F G */ 85 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* H I J K */ 86 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* L M N O */ 87 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* P Q R S */ 88 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* T U V W */ 89 _hex_bad, _hex_bad, _hex_bad, _hex_bad, /* X Y Z [ */ 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, /* | } ~ DEL */ 100 101 /* The high half of unsigned char, all values are _hex_bad. */ 102 _hex_bad, _hex_bad, _hex_bad, _hex_bad, 103 _hex_bad, _hex_bad, _hex_bad, _hex_bad, 104 _hex_bad, _hex_bad, _hex_bad, _hex_bad, 105 _hex_bad, _hex_bad, _hex_bad, _hex_bad, 106 _hex_bad, _hex_bad, _hex_bad, _hex_bad, 107 _hex_bad, _hex_bad, _hex_bad, _hex_bad, 108 _hex_bad, _hex_bad, _hex_bad, _hex_bad, 109 _hex_bad, _hex_bad, _hex_bad, _hex_bad, 110 111 _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#define HEX_TABLE_INITIALIZED 139 140#else 141 142char _hex_value[_hex_array_size]; 143 144#endif /* not ASCII */ 145 146void 147hex_init () 148{ 149#ifndef HEX_TABLE_INITIALIZED 150 int i; 151 152 for (i=0; i<_hex_array_size; i++) 153 { 154 switch (i) 155 { 156 case '0': _hex_value[i] = 0; break; 157 case '1': _hex_value[i] = 1; break; 158 case '2': _hex_value[i] = 2; break; 159 case '3': _hex_value[i] = 3; break; 160 case '4': _hex_value[i] = 4; break; 161 case '5': _hex_value[i] = 5; break; 162 case '6': _hex_value[i] = 6; break; 163 case '7': _hex_value[i] = 7; break; 164 case '8': _hex_value[i] = 8; break; 165 case '9': _hex_value[i] = 9; break; 166 167 case 'a': case 'A': _hex_value[i] = 10; break; 168 case 'b': case 'B': _hex_value[i] = 11; break; 169 case 'c': case 'C': _hex_value[i] = 12; break; 170 case 'd': case 'D': _hex_value[i] = 13; break; 171 case 'e': case 'E': _hex_value[i] = 14; break; 172 case 'f': case 'F': _hex_value[i] = 15; break; 173 174 default: 175 _hex_value[i] = _hex_bad; 176 break; 177 } 178 } 179#endif 180} 181