com32/lib/suffix_number.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2007-2009 H. Peter Anvin - All Rights Reserved
   4  *   Copyright 2009 Intel Corporation; author: H. Peter Anvin
   5  *
   6  *   Permission is hereby granted, free of charge, to any person
   7  *   obtaining a copy of this software and associated documentation
   8  *   files (the "Software"), to deal in the Software without
   9  *   restriction, including without limitation the rights to use,
  10  *   copy, modify, merge, publish, distribute, sublicense, and/or
  11  *   sell copies of the Software, and to permit persons to whom
  12  *   the Software is furnished to do so, subject to the following
  13  *   conditions:
  14  *
  15  *   The above copyright notice and this permission notice shall
  16  *   be included in all copies or substantial portions of the Software.
  17  *
  18  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  20  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  22  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  23  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  24  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25  *   OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * ----------------------------------------------------------------------- */
  28
  29 /*
  30  * suffix_number.c
  31  *
  32  * Convert a string of a number with potential SI suffix to int-type
  33  */
  34
  35 #include <stdlib.h>
  36 #include <suffix_number.h>
  37
  38 /* Get a value with a potential suffix (k/m/g/t/p/e) */
  39 unsigned long long suffix_number(const char *str)
  40 {
  41     char *ep;
  42     unsigned long long v;
  43     int shift;
  44
  45     v = strtoull(str, &ep, 0);
  46     switch (*ep | 0x20) {
  47     case 'k':
  48         shift = 10;
  49         break;
  50     case 'm':
  51         shift = 20;
  52         break;
  53     case 'g':
  54         shift = 30;
  55         break;
  56     case 't':
  57         shift = 40;
  58         break;
  59     case 'p':
  60         shift = 50;
  61         break;
  62     case 'e':
  63         shift = 60;
  64         break;
  65     default:
  66         shift = 0;
  67         break;
  68     }
  69     v <<= shift;
  70
  71     return v;
  72 }