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  1. /* Hex character manipulation support.
  2.    Copyright (C) 1995, 2001 Free Software Foundation, Inc.
  3.  
  4. This file is part of the libiberty library.
  5. Libiberty is free software; you can redistribute it and/or
  6. modify it under the terms of the GNU Library General Public
  7. License as published by the Free Software Foundation; either
  8. version 2 of the License, or (at your option) any later version.
  9.  
  10. Libiberty is distributed in the hope that it will be useful,
  11. but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13. Library General Public License for more details.
  14.  
  15. You should have received a copy of the GNU Library General Public
  16. License along with libiberty; see the file COPYING.LIB.  If
  17. not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
  18. Boston, MA 02110-1301, USA.  */
  19.  
  20. #include <stdio.h>  /* for EOF */
  21. #ifdef HAVE_CONFIG_H
  22. #include "config.h"
  23. #endif
  24. #include "libiberty.h"
  25. #include "safe-ctype.h" /* for HOST_CHARSET_ASCII */
  26.  
  27. #if EOF != -1
  28.  #error "hex.c requires EOF == -1"
  29. #endif
  30.  
  31. /*
  32.  
  33. @deftypefn Extension void hex_init (void)
  34.  
  35. Initializes the array mapping the current character set to
  36. corresponding hex values.  This function must be called before any
  37. call to @code{hex_p} or @code{hex_value}.  If you fail to call it, a
  38. default ASCII-based table will normally be used on ASCII systems.
  39.  
  40. @end deftypefn
  41.  
  42. @deftypefn Extension int hex_p (int @var{c})
  43.  
  44. Evaluates to non-zero if the given character is a valid hex character,
  45. or zero if it is not.  Note that the value you pass will be cast to
  46. @code{unsigned char} within the macro.
  47.  
  48. @end deftypefn
  49.  
  50. @deftypefn Extension {unsigned int} hex_value (int @var{c})
  51.  
  52. Returns the numeric equivalent of the given character when interpreted
  53. as a hexadecimal digit.  The result is undefined if you pass an
  54. invalid hex digit.  Note that the value you pass will be cast to
  55. @code{unsigned char} within the macro.
  56.  
  57. The @code{hex_value} macro returns @code{unsigned int}, rather than
  58. signed @code{int}, to make it easier to use in parsing addresses from
  59. hex dump files: a signed @code{int} would be sign-extended when
  60. converted to a wider unsigned type --- like @code{bfd_vma}, on some
  61. systems.
  62.  
  63. @end deftypefn
  64.  
  65. @undocumented _hex_array_size
  66. @undocumented _hex_bad
  67. @undocumented _hex_value
  68.  
  69. */
  70.  
  71.  
  72. /* Are we ASCII? */
  73. #if HOST_CHARSET == HOST_CHARSET_ASCII
  74.  
  75. const unsigned char _hex_value[_hex_array_size] =
  76. {
  77.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* NUL SOH STX ETX */
  78.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* EOT ENQ ACK BEL */
  79.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* BS  HT  LF  VT  */
  80.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* FF  CR  SO  SI  */
  81.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* DLE DC1 DC2 DC3 */
  82.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* DC4 NAK SYN ETB */
  83.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* CAN EM  SUB ESC */
  84.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* FS  GS  RS  US  */
  85.  
  86.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* SP  !   "   #   */
  87.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* $   %   &   '   */
  88.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* (   )   *   +   */
  89.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* ,   -   .   /   */
  90.   0,        1,        2,        3,          /* 0   1   2   3   */
  91.   4,        5,        6,        7,          /* 4   5   6   7   */
  92.   8,        9,        _hex_bad, _hex_bad,   /* 8   9   :   ;   */
  93.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* <   =   >   ?   */
  94.  
  95.   _hex_bad, 10,       11,       12,         /* @   A   B   C   */
  96.   13,       14,       15,       _hex_bad,   /* D   E   F   G   */
  97.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* H   I   J   K   */
  98.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* L   M   N   O   */
  99.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* P   Q   R   S   */
  100.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* T   U   V   W   */
  101.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* X   Y   Z   [   */
  102.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* \   ]   ^   _   */
  103.  
  104.   _hex_bad, 10,       11,       12,         /* `   a   b   c   */
  105.   13,       14,       15,       _hex_bad,   /* d   e   f   g   */
  106.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* h   i   j   k   */
  107.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* l   m   n   o   */
  108.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* p   q   r   s   */
  109.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* t   u   v   w   */
  110.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* x   y   z   {   */
  111.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,   /* |   }   ~   DEL */
  112.  
  113.   /* The high half of unsigned char, all values are _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.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  120.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  121.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  122.  
  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.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  129.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  130.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  131.  
  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.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  138.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  139.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  140.  
  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.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  147.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  148.   _hex_bad, _hex_bad, _hex_bad, _hex_bad,
  149. };
  150. #define HEX_TABLE_INITIALIZED
  151.  
  152. #else
  153.  
  154. unsigned char _hex_value[_hex_array_size];
  155.  
  156. #endif /* not ASCII */
  157.  
  158. void
  159. hex_init (void)
  160. {
  161. #ifndef HEX_TABLE_INITIALIZED
  162.   int i;
  163.  
  164.   for (i=0; i<_hex_array_size; i++)
  165.     {
  166.       switch (i)
  167.         {
  168.         case '0': _hex_value[i] = 0; break;
  169.         case '1': _hex_value[i] = 1; break;
  170.         case '2': _hex_value[i] = 2; break;
  171.         case '3': _hex_value[i] = 3; break;
  172.         case '4': _hex_value[i] = 4; break;
  173.         case '5': _hex_value[i] = 5; break;
  174.         case '6': _hex_value[i] = 6; break;
  175.         case '7': _hex_value[i] = 7; break;
  176.         case '8': _hex_value[i] = 8; break;
  177.         case '9': _hex_value[i] = 9; break;
  178.  
  179.         case 'a': case 'A': _hex_value[i] = 10; break;
  180.         case 'b': case 'B': _hex_value[i] = 11; break;
  181.         case 'c': case 'C': _hex_value[i] = 12; break;
  182.         case 'd': case 'D': _hex_value[i] = 13; break;
  183.         case 'e': case 'E': _hex_value[i] = 14; break;
  184.         case 'f': case 'F': _hex_value[i] = 15; break;
  185.  
  186.         default:
  187.           _hex_value[i] = _hex_bad;
  188.           break;
  189.         }
  190.     }
  191. #endif
  192. }
  193.