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193 lines
6.8 KiB
C
193 lines
6.8 KiB
C
/* Hex character manipulation support.
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Copyright (C) 1995-2021 Free Software Foundation, Inc.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include <stdio.h> /* for EOF */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "libiberty.h"
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#include "safe-ctype.h" /* for HOST_CHARSET_ASCII */
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#if EOF != -1
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#error "hex.c requires EOF == -1"
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#endif
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/*
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@deftypefn Extension void hex_init (void)
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Initializes the array mapping the current character set to
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corresponding hex values. This function must be called before any
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call to @code{hex_p} or @code{hex_value}. If you fail to call it, a
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default ASCII-based table will normally be used on ASCII systems.
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@end deftypefn
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@deftypefn Extension int hex_p (int @var{c})
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Evaluates to non-zero if the given character is a valid hex character,
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or zero if it is not. Note that the value you pass will be cast to
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@code{unsigned char} within the macro.
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@end deftypefn
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@deftypefn Extension {unsigned int} hex_value (int @var{c})
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Returns the numeric equivalent of the given character when interpreted
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as a hexadecimal digit. The result is undefined if you pass an
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invalid hex digit. Note that the value you pass will be cast to
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@code{unsigned char} within the macro.
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The @code{hex_value} macro returns @code{unsigned int}, rather than
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signed @code{int}, to make it easier to use in parsing addresses from
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hex dump files: a signed @code{int} would be sign-extended when
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converted to a wider unsigned type --- like @code{bfd_vma}, on some
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systems.
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@end deftypefn
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@undocumented _hex_array_size
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@undocumented _hex_bad
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@undocumented _hex_value
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*/
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/* Are we ASCII? */
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#if HOST_CHARSET == HOST_CHARSET_ASCII
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const unsigned char _hex_value[_hex_array_size] =
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{
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* NUL SOH STX ETX */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* EOT ENQ ACK BEL */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* BS HT LF VT */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* FF CR SO SI */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* DLE DC1 DC2 DC3 */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* DC4 NAK SYN ETB */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* CAN EM SUB ESC */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* FS GS RS US */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* SP ! " # */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* $ % & ' */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* ( ) * + */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* , - . / */
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0, 1, 2, 3, /* 0 1 2 3 */
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4, 5, 6, 7, /* 4 5 6 7 */
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8, 9, _hex_bad, _hex_bad, /* 8 9 : ; */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* < = > ? */
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_hex_bad, 10, 11, 12, /* @ A B C */
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13, 14, 15, _hex_bad, /* D E F G */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* H I J K */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* L M N O */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* P Q R S */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* T U V W */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* X Y Z [ */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* \ ] ^ _ */
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_hex_bad, 10, 11, 12, /* ` a b c */
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13, 14, 15, _hex_bad, /* d e f g */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* h i j k */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* l m n o */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* p q r s */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* t u v w */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* x y z { */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad, /* | } ~ DEL */
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/* The high half of unsigned char, all values are _hex_bad. */
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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_hex_bad, _hex_bad, _hex_bad, _hex_bad,
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};
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#define HEX_TABLE_INITIALIZED
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#else
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unsigned char _hex_value[_hex_array_size];
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#endif /* not ASCII */
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void
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hex_init (void)
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{
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#ifndef HEX_TABLE_INITIALIZED
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int i;
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for (i=0; i<_hex_array_size; i++)
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{
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switch (i)
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{
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case '0': _hex_value[i] = 0; break;
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case '1': _hex_value[i] = 1; break;
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case '2': _hex_value[i] = 2; break;
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case '3': _hex_value[i] = 3; break;
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case '4': _hex_value[i] = 4; break;
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case '5': _hex_value[i] = 5; break;
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case '6': _hex_value[i] = 6; break;
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case '7': _hex_value[i] = 7; break;
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case '8': _hex_value[i] = 8; break;
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case '9': _hex_value[i] = 9; break;
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case 'a': case 'A': _hex_value[i] = 10; break;
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case 'b': case 'B': _hex_value[i] = 11; break;
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case 'c': case 'C': _hex_value[i] = 12; break;
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case 'd': case 'D': _hex_value[i] = 13; break;
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case 'e': case 'E': _hex_value[i] = 14; break;
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case 'f': case 'F': _hex_value[i] = 15; break;
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default:
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_hex_value[i] = _hex_bad;
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break;
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}
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}
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#endif
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}
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