minix/sys/arch/i386/stand/lib/crt/dos/doscommain.c

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/* $NetBSD: doscommain.c,v 1.6 2008/12/14 18:46:33 christos Exp $ */
/*
* Copyright (c) 1996
* Matthias Drochner. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/* argument line processing for DOS .COM programs */
#include <lib/libsa/stand.h>
/* The Program Segment Prefix */
static struct psp{
char mist1[0x2c];
short envseg;
char mist2[0x80-2-0x2c];
char cmdlen;
char cmd[127];
} *PSP = (struct psp*)0;
static char* argv[64]; /* theor max */
static int whitespace(char);
static int
whitespace(char c)
{
if ((c == '\0') || (c == ' ') || (c == '\t')
|| (c == '\r') || (c == '\n'))
return (1);
return 0;
}
enum state {skipping, doing_arg, doing_long_arg};
/* build argv/argc, start real main() */
int doscommain(void);
extern int main(int, char**);
int
doscommain(void)
{
int argc, i;
enum state s;
argv[0] = "???"; /* we don't know */
argc = 1;
s = skipping;
for (i = 0; i < PSP->cmdlen; i++){
if (whitespace(PSP->cmd[i])) {
if (s == doing_arg) {
/* end of argument word */
PSP->cmd[i] = '\0';
s = skipping;
}
continue;
}
if (PSP->cmd[i] == '"') {
/* start or end long arg
* (end only if next char is whitespace)
* XXX but '" ' cannot be in argument
*/
switch (s) {
case skipping:
/* next char begins new argument word */
argv[argc++] = &PSP->cmd[i + 1];
s = doing_long_arg;
break;
case doing_long_arg:
if (whitespace(PSP->cmd[i + 1])) {
PSP->cmd[i] = '\0';
s = skipping;
}
case doing_arg:
/* ignore in the middle of arguments */
default:
break;
}
continue;
}
/* all other characters */
if (s == skipping) {
/* begin new argument word */
argv[argc++] = &PSP->cmd[i];
s = doing_arg;
}
}
if (s != skipping)
PSP->cmd[i] = '\0'; /* to be sure */
/* start real main() */
return main(argc, argv);
}