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hex.c
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hex.c
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/* Hex character manipulation support.
Copyright (C) 1995, 2001 Free Software Foundation, Inc.
This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
Libiberty is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
#include <stdio.h> /* for EOF */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "libiberty.h"
#include "safe-ctype.h" /* for HOST_CHARSET_ASCII */
#if EOF != -1
#error "hex.c requires EOF == -1"
#endif
/*
@deftypefn Extension void hex_init (void)
Initializes the array mapping the current character set to
corresponding hex values. This function must be called before any
call to @code{hex_p} or @code{hex_value}. If you fail to call it, a
default ASCII-based table will normally be used on ASCII systems.
@end deftypefn
@deftypefn Extension int hex_p (int @var{c})
Evaluates to non-zero if the given character is a valid hex character,
or zero if it is not. Note that the value you pass will be cast to
@code{unsigned char} within the macro.
@end deftypefn
@deftypefn Extension {unsigned int} hex_value (int @var{c})
Returns the numeric equivalent of the given character when interpreted
as a hexadecimal digit. The result is undefined if you pass an
invalid hex digit. Note that the value you pass will be cast to
@code{unsigned char} within the macro.
The @code{hex_value} macro returns @code{unsigned int}, rather than
signed @code{int}, to make it easier to use in parsing addresses from
hex dump files: a signed @code{int} would be sign-extended when
converted to a wider unsigned type --- like @code{bfd_vma}, on some
systems.
@end deftypefn
@undocumented _hex_array_size
@undocumented _hex_bad
@undocumented _hex_value
*/
/* Are we ASCII? */
#if HOST_CHARSET == HOST_CHARSET_ASCII
const unsigned char _hex_value[_hex_array_size] =
{
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* NUL SOH STX ETX */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* EOT ENQ ACK BEL */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* BS HT LF VT */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* FF CR SO SI */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* DLE DC1 DC2 DC3 */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* DC4 NAK SYN ETB */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* CAN EM SUB ESC */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* FS GS RS US */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* SP ! " # */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* $ % & ' */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* ( ) * + */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* , - . / */
0, 1, 2, 3, /* 0 1 2 3 */
4, 5, 6, 7, /* 4 5 6 7 */
8, 9, _hex_bad, _hex_bad, /* 8 9 : ; */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* < = > ? */
_hex_bad, 10, 11, 12, /* @ A B C */
13, 14, 15, _hex_bad, /* D E F G */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* H I J K */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* L M N O */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* P Q R S */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* T U V W */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* X Y Z [ */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* \ ] ^ _ */
_hex_bad, 10, 11, 12, /* ` a b c */
13, 14, 15, _hex_bad, /* d e f g */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* h i j k */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* l m n o */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* p q r s */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* t u v w */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* x y z { */
_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* | } ~ DEL */
/* The high half of unsigned char, all values are _hex_bad. */
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
_hex_bad, _hex_bad, _hex_bad, _hex_bad,
};
#define HEX_TABLE_INITIALIZED
#else
unsigned char _hex_value[_hex_array_size];
#endif /* not ASCII */
void
hex_init (void)
{
#ifndef HEX_TABLE_INITIALIZED
int i;
for (i=0; i<_hex_array_size; i++)
{
switch (i)
{
case '0': _hex_value[i] = 0; break;
case '1': _hex_value[i] = 1; break;
case '2': _hex_value[i] = 2; break;
case '3': _hex_value[i] = 3; break;
case '4': _hex_value[i] = 4; break;
case '5': _hex_value[i] = 5; break;
case '6': _hex_value[i] = 6; break;
case '7': _hex_value[i] = 7; break;
case '8': _hex_value[i] = 8; break;
case '9': _hex_value[i] = 9; break;
case 'a': case 'A': _hex_value[i] = 10; break;
case 'b': case 'B': _hex_value[i] = 11; break;
case 'c': case 'C': _hex_value[i] = 12; break;
case 'd': case 'D': _hex_value[i] = 13; break;
case 'e': case 'E': _hex_value[i] = 14; break;
case 'f': case 'F': _hex_value[i] = 15; break;
default:
_hex_value[i] = _hex_bad;
break;
}
}
#endif
}