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  1.  
  2. /*=============================================================================
  3.    GNU UnRTF, a command-line program to convert RTF documents to other formats.
  4.    Copyright (C) 2000,2001 Zachary Thayer Smith
  5.  
  6.    This program is free software; you can redistribute it and/or modify
  7.    it under the terms of the GNU General Public License as published by
  8.    the Free Software Foundation; either version 2 of the License, or
  9.    (at your option) any later version.
  10.  
  11.    This program is distributed in the hope that it will be useful,
  12.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14.    GNU General Public License for more details.
  15.  
  16.    You should have received a copy of the GNU General Public License
  17.    along with this program; if not, write to the Free Software
  18.    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19.  
  20.    The author is reachable by electronic mail at tuorfa@yahoo.com.
  21. =============================================================================*/
  22.  
  23.  
  24. /*----------------------------------------------------------------------
  25.  * Module name:    util
  26.  * Author name:    Zach Smith
  27.  * Create date:    01 Aug 01
  28.  * Purpose:        Utility functions.
  29.  *----------------------------------------------------------------------
  30.  * Changes:
  31.  * 22 Sep 01, tuorfa@yahoo.com: added function-level comment blocks
  32.  *--------------------------------------------------------------------*/
  33.  
  34.  
  35.  
  36. #include <stdlib.h>
  37. #include <ctype.h>
  38.  
  39.  
  40.  
  41.  
  42. /*========================================================================
  43.  * Name:        h2toi
  44.  * Purpose:     Converts a 2-digit hexadecimal value to an unsigned integer.
  45.  * Args:        String.
  46.  * Returns:     Integer.
  47.  *=======================================================================*/
  48.  
  49. /* Convert a two-char hexadecimal expression to an integer */
  50. int
  51. h2toi (char *s) {
  52.         int tmp;
  53.         int ch;
  54.         tmp = tolower(*s++);
  55.         if (tmp>'9') tmp-=('a'-10);
  56.         else tmp-='0';
  57.         ch=16*tmp;
  58.         tmp = tolower(*s++);
  59.         if (tmp>'9') tmp-=('a'-10);
  60.         else tmp-='0';
  61.         ch+=tmp;
  62.         return ch;
  63. }
  64.  
  65.