lib/display_options.c

   1 /*
   2  * (C) Copyright 2000-2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25
  26 /*
  27  * return a pointer to a string containing the size
  28  * as "xxx kB", "xxx.y kB", "xxx MB" or "xxx.y MB" as needed;
  29  */
  30 char *size_human_readable(ulong size)
  31 {
  32         static char buf[20];
  33         ulong m, n;
  34         ulong d = 1 << 20;              /* 1 MB */
  35         char  c = 'M';
  36         char *ptr = buf;
  37
  38         if (size < d) {                 /* print in kB */
  39                 c = 'k';
  40                 d = 1 << 10;
  41         }
  42
  43         n = size / d;
  44
  45         m = (10 * (size - (n * d)) + (d / 2) ) / d;
  46
  47         if (m >= 10) {
  48                 m -= 10;
  49                 n += 1;
  50         }
  51
  52         ptr += sprintf(buf, "%2ld", n);
  53         if (m) {
  54                 ptr += sprintf (ptr,".%ld", m);
  55         }
  56         sprintf(ptr, " %cB", c);
  57
  58         return buf;
  59 }
  60 EXPORT_SYMBOL(size_human_readable);