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/* ----------------------------------------------------------------------- *
*
* Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
* Copyright 2013 Intel Corporation; author: H. Peter Anvin
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* argv.c
*
* Parse the MS-DOS command line into argc and argv (argc is return value.)
* memptr points to available memory.
*/
#include <inttypes.h>
#include <stddef.h>
#include <stdbool.h>
#include "mystuff.h"
#define ALIGN_UP(p,t) ((t *)(((uintptr_t)(p) + (sizeof(t)-1)) & ~(sizeof(t)-1)))
extern char __heap_start[];
void *__mem_end = &__heap_start; /* Global variable for use by malloc() */
int __parse_argv(char ***argv)
{
char *mem = __mem_end;
const char *str, *p;
char *q = mem;
char c, *r;
char **arg;
bool wasspace;
int argc;
int len;
size_t offs;
int nulls;
uint16_t nstr;
/* Find and copy argv[0] after the environment block */
set_fs(_PSP.environment);
offs = 0;
nulls = 0;
do {
if (get_8_fs(offs++) == '\0')
nulls++;
else
nulls = 0;
} while (nulls < 2);
nstr = get_16_fs(offs);
offs += 2;
/* Copy the null-terminated filename string */
if (nstr >= 1) {
while ((c = get_8_fs(offs++)))
*q++ = c;
}
*q++ = '\0';
/* Now for the command line tail... */
len = _PSP.cmdlen;
str = _PSP.cmdtail;
argc = 1;
wasspace = true;
/* Copy the command tail, turning whitespace runs into nulls */
for (p = str;; p++) {
if (!len || *p <= ' ') {
if (!wasspace) {
wasspace = true;
*q++ = '\0';
}
} else {
if (wasspace) {
argc++;
wasspace = false;
}
*q++ = *p;
}
/* This test is AFTER we have processed the end byte;
we treat it as a whitespace character so it terminates
the last argument */
if (!len--)
break;
}
/* Now create argv */
arg = ALIGN_UP(q, char *);
*argv = arg;
*arg++ = mem; /* argv[0] */
q--; /* Point q to terminal character */
for (r = mem; r < q; r++) {
if (*r == '\0') {
*arg++ = r + 1;
}
}
*arg++ = NULL; /* Null pointer at the end */
__mem_end = arg; /* End of memory we used */
return argc;
}
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