#define INCL_WIN
#define INCL_DOS

#include <os2.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <io.h>
#include <fcntl.h>
#include <share.h>
#include "fm3dll.h"

#pragma alloc_text(FSOPEN,_fsopen)

FILE * _fsopen (CHAR *filename,CHAR *mode,INT sharemode,...) {

  ULONG openflag = OPEN_ACTION_OPEN_IF_EXISTS,openmode = 0,action = 0;
  HFILE handle;
  FILE *fp;
  BOOL  text = TRUE;

  if(!stristr(mode,"b"))
    text = FALSE;
  if(stristr(mode,"r"))
    openmode |= OPEN_ACCESS_READONLY;
  else if(stristr(mode,"w")) {
    openmode |= OPEN_ACCESS_WRITEONLY;
    openflag |= (OPEN_ACTION_REPLACE_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW);
  }
  if(stristr(mode,"a"))
    openmode |= OPEN_ACCESS_WRITEONLY;
  if(stristr(mode,"+")) {
    openmode &= (~(OPEN_ACCESS_READONLY | OPEN_ACCESS_WRITEONLY));
    openmode |= OPEN_ACCESS_READWRITE;
    openflag |= OPEN_ACTION_CREATE_IF_NEW;
  }
  if(sharemode == SH_DENYRW)
    openmode |= OPEN_SHARE_DENYREADWRITE;
  else if(sharemode == SH_DENYWR)
    openmode |= OPEN_SHARE_DENYWRITE;
  else if(sharemode == SH_DENYRD)
    openmode |= OPEN_SHARE_DENYREAD;
  else
    openmode |= OPEN_SHARE_DENYNONE;
  openmode |= OPEN_FLAGS_FAIL_ON_ERROR;
  if(text)
    openmode |= OPEN_FLAGS_SEQUENTIAL;
  else
    openmode |= OPEN_FLAGS_RANDOMSEQUENTIAL;
  if(DosOpen(filename,&handle,&action,0L,FILE_NORMAL,openflag,openmode,
             (PEAOP2)0))
    return NULL;
  if(mode[strlen(mode) - 1] == 't')
    mode[strlen(mode) - 1] = 0; /* bug bug bug */
  fp = fdopen(handle,mode);
  if(!fp) {
    DosClose(handle);
    fp = fopen(filename,mode);  /* last ditch effort */
  }
  if(fp) {
    if(text)   /* line buffer text files */
      setvbuf(fp,NULL,_IOLBF,BUFSIZ * 2);
    else
      setvbuf(fp,NULL,_IOFBF,BUFSIZ * 8);
    if(stristr(mode,"a"))
      fseek(fp,0L,SEEK_END);
  }
  return fp;
}