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      1 /*	$NetBSD: doscommain.c,v 1.1 2024/06/29 13:45:14 rin 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 
     35 static 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 
     43 static char* argv[64]; /* theor max */
     44 
     45 static int whitespace(char);
     46 
     47 static int
     48 whitespace(char c)
     49 {
     50 	if ((c == '\0') || (c == ' ') || (c == '\t')
     51 	    || (c == '\r') || (c == '\n'))
     52 		return (1);
     53 	return 0;
     54 }
     55 
     56 enum state {skipping, doing_arg, doing_long_arg};
     57 
     58 /* build argv/argc, start real main() */
     59 int doscommain(void);
     60 extern int main(int, char**);
     61 
     62 int
     63 doscommain(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