110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
/*
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* misc.c - various assorted functions
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*
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* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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#include <malloc.h>
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#include <errno.h>
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#include <fs.h>
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#include <linux/ctype.h>
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/*
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* Like simple_strtoul() but handles an optional G, M, K or k
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* suffix for Gigabyte, Megabyte or Kilobyte
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*/
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unsigned long strtoul_suffix(const char *str, char **endp, int base)
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{
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unsigned long val;
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char *end;
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val = simple_strtoul(str, &end, base);
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switch (*end) {
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case 'G':
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val *= 1024;
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case 'M':
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val *= 1024;
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case 'k':
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case 'K':
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val *= 1024;
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end++;
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default:
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break;
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}
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if (endp)
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*endp = (char *)end;
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return val;
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}
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EXPORT_SYMBOL(strtoul_suffix);
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/*
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* This function parses strings in the form <startadr>[-endaddr]
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* or <startadr>[+size] and fills in start and size accordingly.
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* <startadr> and <endadr> can be given in decimal or hex (with 0x prefix)
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* and can have an optional G, M, K or k suffix.
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*
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* examples:
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* 0x1000-0x2000 -> start = 0x1000, size = 0x1001
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* 0x1000+0x1000 -> start = 0x1000, size = 0x1000
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* 0x1000 -> start = 0x1000, size = ~0
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* 1M+1k -> start = 0x100000, size = 0x400
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*/
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int parse_area_spec(const char *str, ulong *start, ulong *size)
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{
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char *endp;
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ulong end;
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if (!isdigit(*str))
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return -1;
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*start = strtoul_suffix(str, &endp, 0);
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str = endp;
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if (!*str) {
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/* beginning given, but no size, assume maximum size */
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*size = ~0;
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return 0;
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}
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if (*str == '-') {
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/* beginning and end given */
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end = strtoul_suffix(str + 1, NULL, 0);
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if (end < *start) {
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printf("end < start\n");
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return -1;
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}
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*size = end - *start + 1;
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return 0;
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}
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if (*str == '+') {
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/* beginning and size given */
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*size = strtoul_suffix(str + 1, NULL, 0);
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return 0;
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}
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return -1;
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}
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EXPORT_SYMBOL(parse_area_spec);
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