Open64: osprey/cygnus/libiberty/hex.c Source File

00001 /*
00002  * Copyright 2003, 2004, 2005, 2006 PathScale, Inc.  All Rights Reserved.
00003  */
00004 
00005 /* Hex character manipulation support.
00006    Copyright (C) 1995, 2001 Free Software Foundation, Inc.
00007 
00008 This file is part of the libiberty library.
00009 Libiberty is free software; you can redistribute it and/or
00010 modify it under the terms of the GNU Library General Public
00011 License as published by the Free Software Foundation; either
00012 version 2 of the License, or (at your option) any later version.
00013 
00014 Libiberty is distributed in the hope that it will be useful,
00015 but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017 Library General Public License for more details.
00018 
00019 You should have received a copy of the GNU Library General Public
00020 License along with libiberty; see the file COPYING.LIB.  If
00021 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00022 Boston, MA 02111-1307, USA.  */
00023 
00024 #include <stdio.h>  /* for EOF */
00025 #include "libiberty.h"
00026 #include "safe-ctype.h" /* for HOST_CHARSET_ASCII */
00027 
00028 #if EOF != -1
00029  #error "hex.c requires EOF == -1"
00030 #endif
00031 
00032 /*
00033 
00034 @deftypefn Extension void hex_init (void)
00035 
00036 Initializes the array mapping the current character set to
00037 corresponding hex values.  This function must be called before any
00038 call to @code{hex_p} or @code{hex_value}.  If you fail to call it, a
00039 default ASCII-based table will normally be used on ASCII systems.
00040 
00041 @end deftypefn
00042 
00043 @deftypefn Extension int hex_p (int @var{c})
00044 
00045 Evaluates to non-zero if the given character is a valid hex character,
00046 or zero if it is not.  Note that the value you pass will be cast to
00047 @code{unsigned char} within the macro.
00048 
00049 @end deftypefn
00050 
00051 @deftypefn Extension {unsigned int} hex_value (int @var{c})
00052 
00053 Returns the numeric equivalent of the given character when interpreted
00054 as a hexidecimal digit.  The result is undefined if you pass an
00055 invalid hex digit.  Note that the value you pass will be cast to
00056 @code{unsigned char} within the macro.
00057 
00058 The @code{hex_value} macro returns @code{unsigned int}, rather than
00059 signed @code{int}, to make it easier to use in parsing addresses from
00060 hex dump files: a signed @code{int} would be sign-extended when
00061 converted to a wider unsigned type --- like @code{bfd_vma}, on some
00062 systems.
00063 
00064 @end deftypefn
00065 
00066 @undocumented _hex_array_size
00067 @undocumented _hex_bad
00068 @undocumented _hex_value
00069 
00070 */
00071 
00072 
00073 /* Are we ASCII? */
00074 #if HOST_CHARSET == HOST_CHARSET_ASCII
00075 
00076 const unsigned char _hex_value[_hex_array_size] =
00077 {
00078   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* NUL SOH STX ETX */
00079   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* EOT ENQ ACK BEL */
00080   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* BS  HT  LF  VT  */
00081   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* FF  CR  SO  SI  */
00082   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* DLE DC1 DC2 DC3 */
00083   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* DC4 NAK SYN ETB */
00084   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* CAN EM  SUB ESC */
00085   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* FS  GS  RS  US  */
00086 
00087   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* SP  !   "   #   */
00088   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* $   %   &   '   */
00089   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* (   )   *   +   */
00090   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* ,   -   .   /   */
00091   0,        1,        2,        3,          /* 0   1   2   3   */
00092   4,        5,        6,        7,          /* 4   5   6   7   */
00093   8,        9,        _hex_bad, _hex_bad,   /* 8   9   :   ;   */
00094   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* <   =   >   ?   */
00095 
00096   _hex_bad, 10,       11,       12,         /* @   A   B   C   */
00097   13,       14,       15,       _hex_bad,   /* D   E   F   G   */
00098   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* H   I   J   K   */
00099   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* L   M   N   O   */
00100   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* P   Q   R   S   */
00101   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* T   U   V   W   */
00102   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* X   Y   Z   [   */
00103   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* \   ]   ^   _   */
00104 
00105   _hex_bad, 10,       11,       12,         /* `   a   b   c   */
00106   13,       14,       15,       _hex_bad,   /* d   e   f   g   */
00107   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* h   i   j   k   */
00108   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* l   m   n   o   */
00109   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* p   q   r   s   */
00110   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* t   u   v   w   */
00111   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* x   y   z   {   */
00112   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* |   }   ~   DEL */
00113 
00114   /* The high half of unsigned char, all values are _hex_bad.  */
00115   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00116   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00117   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00118   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00119   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00120   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00121   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00122   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00123 
00124   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00125   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00126   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00127   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00128   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00129   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00130   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00131   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00132 
00133   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00134   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00135   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00136   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00137   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00138   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00139   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00140   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00141 
00142   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00143   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00144   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00145   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00146   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00147   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00148   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00149   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
00150 };
00151 #define HEX_TABLE_INITIALIZED
00152 
00153 #else
00154 
00155 unsigned char _hex_value[_hex_array_size];
00156 
00157 #endif /* not ASCII */
00158 
00159 void
00160 hex_init ()
00161 {
00162 #ifndef HEX_TABLE_INITIALIZED
00163   int i;
00164 
00165   for (i=0; i<_hex_array_size; i++)
00166     {
00167       switch (i)
00168   {
00169   case '0': _hex_value[i] = 0; break;
00170   case '1': _hex_value[i] = 1; break;
00171   case '2': _hex_value[i] = 2; break;
00172   case '3': _hex_value[i] = 3; break;
00173   case '4': _hex_value[i] = 4; break;
00174   case '5': _hex_value[i] = 5; break;
00175   case '6': _hex_value[i] = 6; break;
00176   case '7': _hex_value[i] = 7; break;
00177   case '8': _hex_value[i] = 8; break;
00178   case '9': _hex_value[i] = 9; break;
00179 
00180   case 'a': case 'A': _hex_value[i] = 10; break;
00181   case 'b': case 'B': _hex_value[i] = 11; break;
00182   case 'c': case 'C': _hex_value[i] = 12; break;
00183   case 'd': case 'D': _hex_value[i] = 13; break;
00184   case 'e': case 'E': _hex_value[i] = 14; break;
00185   case 'f': case 'F': _hex_value[i] = 15; break;
00186 
00187   default:
00188     _hex_value[i] = _hex_bad;
00189     break;
00190   }
00191     }
00192 #endif
00193 }