1/*	$NetBSD: doscommain.c,v 1.5 2005/12/11 12:17:48 christos Exp $	*/
2
3/*
4 * Copyright (c) 1996
5 *	Matthias Drochner.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 */
28
29/* argument line processing for DOS .COM programs */
30
31#include <lib/libsa/stand.h>
32
33/* The Program Segment Prefix */
34
35static struct psp{
36	char mist1[0x2c];
37	short envseg;
38	char mist2[0x80-2-0x2c];
39	char cmdlen;
40	char cmd[127];
41} *PSP = (struct psp*)0;
42
43static char* argv[64]; /* theor max */
44
45static int whitespace(char);
46
47static int
48whitespace(char c)
49{
50	if ((c == '\0') || (c == ' ') || (c == '\t')
51	    || (c == '\r') || (c == '\n'))
52		return (1);
53	return 0;
54}
55
56enum state {skipping, doing_arg, doing_long_arg};
57
58/* build argv/argc, start real main() */
59int doscommain(void);
60extern int main(int, char**);
61
62int
63doscommain(void)
64{
65	int argc, i;
66	enum state s;
67
68	argv[0] = "???"; /* we don't know */
69	argc = 1;
70	s = skipping;
71
72	for (i = 0; i < PSP->cmdlen; i++){
73
74		if (whitespace(PSP->cmd[i])) {
75			if (s == doing_arg) {
76				/* end of argument word */
77				PSP->cmd[i] = '\0';
78				s = skipping;
79			}
80			continue;
81		}
82
83		if (PSP->cmd[i] == '"') {
84			/* start or end long arg
85			 * (end only if next char is whitespace)
86			 *  XXX but '" ' cannot be in argument
87			 */
88			switch (s) {
89			case skipping:
90				/* next char begins new argument word */
91				argv[argc++] = &PSP->cmd[i + 1];
92				s = doing_long_arg;
93				break;
94			case doing_long_arg:
95				if (whitespace(PSP->cmd[i + 1])) {
96					PSP->cmd[i] = '\0';
97					s = skipping;
98				}
99			case doing_arg:
100				/* ignore in the middle of arguments */
101			default:
102				break;
103			}
104			continue;
105		}
106
107		/* all other characters */
108		if (s == skipping) {
109			/* begin new argument word */
110			argv[argc++] = &PSP->cmd[i];
111			s = doing_arg;
112		}
113	}
114	if (s != skipping)
115		PSP->cmd[i] = '\0'; /* to be sure */
116
117	/* start real main() */
118	return main(argc, argv);
119}
120