/*
	Software License Agreement (BSD License)
	
	Copyright (c) 1997-2008, David Lindauer, (LADSoft).
	All rights reserved.
	
	Redistribution and use of this software in source and binary forms, with or without modification, are
	permitted provided that the following conditions are met:
	
	* Redistributions of source code must retain the above
	  copyright notice, this list of conditions and the
	  following disclaimer.
	
	* 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.
	
	* Neither the name of LADSoft nor the names of its
	  contributors may be used to endorse or promote products
	  derived from this software without specific prior
	  written permission of LADSoft.
	
	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <dir.h>
#include <ctype.h>
#include <dpmi.h>
#include "llp.h"

#define TRUE 1
#define FALSE 0

#define MAXFILES 10000

extern short _pspseg, _envseg;

int _RTL_DATA _argc, _RTL_DATA __argc;
char _RTL_DATA **_argv, _RTL_DATA **__argv;
char *_passed_name ;
#pragma startup argset 15

static char oldcwd[256];
static int oldDrive = 0;
static struct ffblk fileBlock;
static char **filelist=0;
static int filenum=0,filecount=0;

static void get_progname(char *buf)
{
	char * pos;
	SELECTOR sel;
	DPMI_REGS regs;
	int len;

	__doscall(0x19,&regs);
	buf[0] = regs.b.al + 'A';
	buf[1] = ':';
	/* get path */

	/* find file name, assumes DOS 3... */
	asm push edi
	asm push es
	asm mov ecx,-1
	asm sub edi,edi
   asm mov es,[_envseg]
	asm sub al,al
lp:
	asm repnz scasb
	asm cmp es:[edi],al
	asm jnz lp
	asm add edi,3
	asm movzx edx,byte ptr es:[edi+1]
  asm mov [pos],edi
  asm mov [sel],es
	asm mov ecx,-1
	asm repnz scasb
	asm not ecx
	asm mov [len],ecx
	asm pop es
	asm pop edi
	if (_EDX == ':')
		dpmi_copy_to_ds(buf,sel,(ULONG) pos,len);
	else
		dpmi_copy_to_ds(buf+2,sel,(ULONG) pos,len);
	

}
static char *FirstFile(char *spec)
{
  if (findfirst(spec, &fileBlock, _A_NORMAL ))
    return(0);
  return(fileBlock.ff_name) ;
}
static char *NextFile(void)
{
  if (findnext( &fileBlock))
    return(0);
  return(fileBlock.ff_name);
}
static int rfsort(const void *elem1, const void *elem2)
{
	return(strcmp(*(char **)elem1, *(char **)elem2));
}
static char *litlate(char *dir, char *t)
{
   char *q,buf[256];
	if (!t)
		return 0;
   if (dir) {
      strcpy(buf,dir) ;
      q = strrchr(buf,'\\') ;
      if (q)
        strcpy(q+1,t) ;
      else
         strcpy(buf,t) ; 
   } else
      strcpy(buf,t) ;
   q = malloc(strlen(buf)+1);
	if (!q) {
		fprintf(stdout,"out of memory");
		exit(1) ;
	}
   strcpy(q,buf);
	return q;
}
static void ClearFiles(void)
{
	free(filelist);
	filelist = 0;
	filecount = 0 ;
}
static char *ReadFiles(char *spec)
{
   char buf[256] ;
   int fullpath = FALSE ;
   if (spec[0] == '.' && spec[1] == '.') {
      char *p ;
      getcwd(buf,256) ;
      p = strlen(buf) + buf ;

      while (spec[0] == '.' && spec[1] == '.') {
         spec += 2 ;
         while (*(p-1) != '\\' && *(p-1) != ':')
            p-- ;
         if (*(p-1) == '\\')
            p-- ;
         if (spec [0] != '\\')
            break ;
         spec++ ;
      }
      *p++ = '\\' ;
      strcpy(p,spec) ;
   } else
      strcpy(buf,spec) ;
   if (strchr(buf,'\\'))
      fullpath = TRUE ;
	if (!filelist) {
		filelist = malloc(sizeof(char *)*MAXFILES);
		if (!filelist) {
			fprintf(stderr,"out of memory");
			exit(1) ;
		}
	}
   if ((filelist[0] = litlate(fullpath ? buf : 0,FirstFile(buf))) == 0) {    
		return 0;
	}
   while((filelist[++filecount] = litlate(fullpath ? buf : 0,NextFile())) != 0)
		if (filecount >= MAXFILES-1) {
			fprintf(stderr,"Too many files... qualify file names to limit to %d at a time",MAXFILES);
			break ;
		}
	return (char *)1;
}
static int qualify(char *name)
{
  int i ;
	for(i=0; i < strlen(name); i++)
      if (!isalnum(*name) && *name != '\\' && *name != ':' && *name != '*' && *name != '?' && *name != '.')
			return FALSE ;
	return TRUE ;
}
static void argset(void)
{
	char buf[200];
	char *bufp[100], *ocl, *_cmdline;
	int inquote = 0;
    char *dir;
    char *file;
    char *fileName;
    int drive;
	ocl = _cmdline = malloc(128);
	dpmi_copy_to_ds(_cmdline,_pspseg,0x80,128);
  _cmdline[_cmdline[0]+1] = 0;
	_cmdline++;
	filenum = 0;
	filecount = 0;
   _argc = 1;
	while (*_cmdline) {
		while (isspace(*_cmdline)) _cmdline++;
		if (*_cmdline) {
         int wasquote = FALSE ;
			int i = 0;
			while ((inquote || !isspace(*_cmdline)) && *_cmdline)  {
				if (*_cmdline == '"') {
               wasquote = TRUE ;
					inquote = !inquote ;
					_cmdline++ ;
					continue ;
				}
				buf[i++] = *_cmdline++;
			}
         buf[i++] = 0 ;
         if (!wasquote && qualify(buf)) {
            if ((fileName = ReadFiles(buf)) == 0) {
               goto join ;
            }     
            if (filecount) {
               _argv = realloc(_argv,(_argc + filecount) * sizeof(char *)) ;
               memcpy(_argv+_argc,filelist,filecount *sizeof(char *)) ;
               _argc += filecount ;
               ClearFiles() ;
            } else
               goto join ;
         } else
         {
join:
               _argv = realloc(_argv,(_argc + 1) * sizeof(char *)) ;
               _argv[_argc++] = strdup(buf) ;
         }
            
		}
	}
   _argv = realloc(_argv,(_argc + 1) * sizeof(char *)) ;
   _argv[_argc] = 0 ;
   _passed_name = _argv[0] ;
	_cmdline = ocl;
	get_progname(_cmdline);
   _argv[0] = _cmdline;
   __argc = _argc ;
   __argv = _argv ;
}