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      1 /*	$NetBSD: srt1.c,v 1.6 2009/03/14 14:45:52 dsl Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2001 Ben Harris.
      5  * Copyright (c) 1996
      6  *	Matthias Drochner.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 /* Command-line parsing from i386 doscommain.c */
     30 
     31 #include <lib/libkern/libkern.h>
     32 #include <lib/libsa/stand.h>
     33 #include <riscoscalls.h>
     34 #include <srt0.h>
     35 
     36 
     37 /* limit of the memory given to us by RISC OS's WIMPslot; inited by srt0.S */
     38 /* init it also to a reasonable value also so it doesnt get into the BSS ! */
     39 void *HIMEM = (void *) 0x12000;
     40 
     41 
     42 static int whitespace(char);
     43 
     44 static int whitespace(char c) {
     45 	if ((c == '\0') || (c == ' ') || (c == '\t')
     46 	    || (c == '\r') || (c == '\n'))
     47 		return (1);
     48 	return (0);
     49 }
     50 
     51 
     52 enum state {skipping, doing_arg, doing_long_arg};
     53 
     54 
     55 /* build argv/argc, start real main() */
     56 void __start(void);
     57 int splitargs(char *, int, char**);
     58 extern int main(int, char**);
     59 
     60 extern char edata[], end[];
     61 
     62 
     63 void
     64 __start(void)
     65 {
     66 	int argc;
     67 	char *ro_args, *args, **argv;
     68 
     69 	/* Clear BSS */
     70 	memset(edata, 0, end - edata);
     71 
     72 	/* Define heap. */
     73 	setheap(end, (void *)(HIMEM - 0x1000));
     74 
     75 	ro_args = os_get_env(NULL, NULL);
     76 
     77 	args = alloc(strlen(ro_args)+10);	/* some spare extra */
     78 	strcpy(args, ro_args);
     79 
     80 	argc = splitargs(args, 0, NULL);
     81 	argv = alloc(argc * sizeof(*argv));
     82 	if (argv == NULL)
     83 		panic("alloc of argv failed");
     84 	argc = splitargs(args, 1, argv);
     85 
     86 	/* start real main() */
     87 	os_exit(NULL, main(argc, argv));
     88 }
     89 
     90 int
     91 splitargs(char *args, int really, char **argv)
     92 {
     93 	int argc, i;
     94 	enum state s;
     95 
     96 	argc = 0;
     97 	s = skipping;
     98 
     99 	for (i = 0; args[i]; i++){
    100 
    101 		if (whitespace(args[i])) {
    102 			if (s == doing_arg) {
    103 				/* end of argument word */
    104 				if (really)
    105 					args[i] = '\0';
    106 				s = skipping;
    107 			}
    108 			continue;
    109 		}
    110 
    111 		if (args[i] == '"') {
    112 			/* start or end long arg
    113 			 * (end only if next char is whitespace)
    114 			 *  XXX but '" ' cannot be in argument
    115 			 */
    116 			switch (s) {
    117 			case skipping:
    118 				/* next char begins new argument word */
    119 				if (really)
    120 					argv[argc] = &args[i + 1];
    121 				argc++;
    122 				s = doing_long_arg;
    123 				break;
    124 			case doing_long_arg:
    125 				if (whitespace(args[i + 1])) {
    126 					if (really)
    127 						args[i] = '\0';
    128 					s = skipping;
    129 				}
    130 				break;
    131 			case doing_arg:
    132 				/* ignore in the middle of arguments */
    133 			default:
    134 				break;
    135 			}
    136 			continue;
    137 		}
    138 
    139 		/* all other characters */
    140 		if (s == skipping) {
    141 			/* begin new argument word */
    142 			if (really)
    143 				argv[argc] = &args[i];
    144 			argc++;
    145 			s = doing_arg;
    146 		}
    147 	}
    148 	return argc;
    149 }
    150 
    151 void _rtt(void)
    152 {
    153 
    154 	os_exit(NULL, 0);
    155 }
    156