1
2/*
3 *  Copyright (C) 2001-2003 Hewlett-Packard Co.
4 *      Contributed by Stephane Eranian <eranian@hpl.hp.com>
5 *
6 *  Copyright (C) 2001 Silicon Graphics, Inc.
7 *      Contributed by Brent Casavant <bcasavan@sgi.com>
8 *
9 *  Copyright (C) 2006-2009 Intel Corporation
10 *      Contributed by Fenghua Yu <fenghua.yu@intel.com>
11 *      Contributed by Bibo Mao <bibo.mao@intel.com>
12 *      Contributed by Chandramouli Narayanan <mouli@linux.intel.com>
13 *
14 * This file is part of the ELILO, the EFI Linux boot loader.
15 *
16 *  ELILO is free software; you can redistribute it and/or modify
17 *  it under the terms of the GNU General Public License as published by
18 *  the Free Software Foundation; either version 2, or (at your option)
19 *  any later version.
20 *
21 *  ELILO is distributed in the hope that it will be useful,
22 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
23 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24 *  GNU General Public License for more details.
25 *
26 *  You should have received a copy of the GNU General Public License
27 *  along with ELILO; see the file COPYING.  If not, write to the Free
28 *  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
29 *  02111-1307, USA.
30 *
31 * Please check out the elilo.txt for complete documentation on how
32 * to use this program.
33 */
34
35
36#include <efi.h>
37#include <efilib.h>
38#include <argify.h>
39
40
41
42#define	MAX_ARGS 256
43
44#define CHAR_SPACE L' '
45
46#define DEBUG 0
47
48INTN
49argify(CHAR16 *buf, UINTN len, CHAR16 **argv)
50{
51
52        UINTN     i=0, j=0;
53        CHAR16   *p = buf;
54
55        if (buf == 0) {
56		argv[0] = NULL;
57		return 0;
58	}
59	/* len represents the number of bytes, not the number of 16 bytes chars */
60	len = len >> 1;
61
62	/*
63	 * Here we use CHAR_NULL as the terminator rather than the length
64	 * because it seems like the EFI shell return rather bogus values for it.
65	 * Apparently, we are guaranteed to find the '\0' character in the buffer
66	 * where the real input arguments stop, so we use it instead.
67	 */
68	for(;;) {
69		while (buf[i] == CHAR_SPACE && buf[i] != CHAR_NULL && i < len) i++;
70
71		if (buf[i] == CHAR_NULL || i == len) goto end;
72
73		p = buf+i;
74		i++;
75
76		while (buf[i] != CHAR_SPACE && buf[i] != CHAR_NULL && i < len) i++;
77
78		argv[j++] = p;
79
80		if (buf[i] == CHAR_NULL) goto end;
81
82		buf[i]  = CHAR_NULL;
83
84		if (i == len)  goto end;
85
86		i++;
87
88		if (j == MAX_ARGS-1) {
89			Print(L"too many arguments (%d) truncating\n", j);
90			goto end;
91		}
92	}
93end:
94        argv[j] = NULL;
95	return j;
96}
97
98