lib/misc.c

   1 /*
   2  * misc.c - various assorted functions
   3  *
   4  * Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2
  11  * as published by the Free Software Foundation.
  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, MA  02111-1307  USA
  21  */
  22
  23 #include <common.h>
  24 #include <malloc.h>
  25 #include <errno.h>
  26 #include <fs.h>
  27 #include <linux/ctype.h>
  28
  29 /*
  30  * Like simple_strtoul() but handles an optional G, M, K or k
  31  * suffix for Gigabyte, Megabyte or Kilobyte
  32  */
  33 unsigned long strtoul_suffix(const char *str, char **endp, int base)
  34 {
  35         unsigned long val;
  36         char *end;
  37
  38         val = simple_strtoul(str, &end, base);
  39
  40         switch (*end) {
  41         case 'G':
  42                 val *= 1024;
  43         case 'M':
  44                 val *= 1024;
  45         case 'k':
  46         case 'K':
  47                 val *= 1024;
  48                 end++;
  49         default:
  50                 break;
  51         }
  52
  53         if (endp)
  54                 *endp = (char *)end;
  55
  56         return val;
  57 }
  58 EXPORT_SYMBOL(strtoul_suffix);
  59
  60 /*
  61  * This function parses strings in the form <startadr>[-endaddr]
  62  * or <startadr>[+size] and fills in start and size accordingly.
  63  * <startadr> and <endadr> can be given in decimal or hex (with 0x prefix)
  64  * and can have an optional G, M, K or k suffix.
  65  *
  66  * examples:
  67  * 0x1000-0x2000 -> start = 0x1000, size = 0x1001
  68  * 0x1000+0x1000 -> start = 0x1000, size = 0x1000
  69  * 0x1000        -> start = 0x1000, size = ~0
  70  * 1M+1k         -> start = 0x100000, size = 0x400
  71  */
  72 int parse_area_spec(const char *str, ulong *start, ulong *size)
  73 {
  74         char *endp;
  75         ulong end;
  76
  77         if (!isdigit(*str))
  78                 return -1;
  79
  80         *start = strtoul_suffix(str, &endp, 0);
  81
  82         str = endp;
  83
  84         if (!*str) {
  85                 /* beginning given, but no size, assume maximum size */
  86                 *size = ~0;
  87                 return 0;
  88         }
  89
  90         if (*str == '-') {
  91                 /* beginning and end given */
  92                 end = strtoul_suffix(str + 1, NULL, 0);
  93                 if (end < *start) {
  94                         printf("end < start\n");
  95                         return -1;
  96                 }
  97                 *size = end - *start + 1;
  98                 return 0;
  99         }
 100
 101         if (*str == '+') {
 102                 /* beginning and size given */
 103                 *size = strtoul_suffix(str + 1, NULL, 0);
 104                 return 0;
 105         }
 106
 107         return -1;
 108 }
 109 EXPORT_SYMBOL(parse_area_spec);