/* from Dale Schumacher's dLibs */

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>

extern	FILE	_iob[];

FILE *fdopen(h, mode)
	register int h;
	const register char *mode;
{
	extern int __default_mode__;	/* see binmode.c */
	register int i, iomode = 0, f = __default_mode__;
	register FILE *fp = NULL;
	void _getbuf(FILE *);

	for(i=0; (!fp && (i < _NFILE)); ++i)
		if(!(_iob[i]._flag & (_IORW | _IOREAD | _IOWRT)))
			fp = &_iob[i];    /* empty slot */
	if(!fp)
		return(NULL);

	while(*mode) {
		switch(*mode++) {
			case 'r':
				f |= _IOREAD;
				break;
			case 'w':
				f |= _IOWRT;
				iomode |= (O_CREAT | O_TRUNC);
				break;
			case 'a':
				f |= _IOWRT;
				iomode |= (O_CREAT | O_APPEND);
				break;
			case '+':
				f &= ~(_IOREAD | _IOWRT);
				f |= _IORW;
				break;
			case 'b':
				f |= _IOBIN;
				break;
			case 't':
				f &= ~_IOBIN;
				break;
			default:		/* illegal file mode */
				return(NULL);
			}
	}
	if((i = (f & (_IORW | _IOREAD | _IOWRT))) == 0)
		return(NULL);
	else if(i == _IOREAD)
		iomode |= O_RDONLY;
	else if(i == _IOWRT)
		iomode |= O_WRONLY;
	else
		iomode |= O_RDWR;

	if(isatty(h))
		f |= (_IODEV | _IONBF);
	else
		f |= _IOFBF;
	fp->_file = h;			/* file handle */
	fp->_flag = f;			/* file status flags */
	_getbuf(fp);
	return(fp);
}