[unix-history] / usr / src / libc / stdio / fdopen.c

/*
 * Unix routine to do an "fopen" on file descriptor
 * The mode has to be repeated because you can't query its
 * status
 */

#include	<stdio.h>
#include	<errno.h>

FILE *
fdopen(fd, mode)
register char *mode;
{
	extern int errno;
	register FILE *iop;
	extern FILE *_lastbuf;

	for (iop = _iob; iop->_flag&(_IOREAD|_IOWRT); iop++)
		if (iop >= _lastbuf)
			return(NULL);
	iop->_cnt = 0;
	iop->_file = fd;
	if (*mode != 'r') {
		iop->_flag |= _IOWRT;
		if (*mode == 'a')
			lseek(fd, 0L, 2);
	} else
		iop->_flag |= _IOREAD;
	return(iop);
}
Commit	Line	Data
18e5fa7e BJ	1	/*
	2	* Unix routine to do an "fopen" on file descriptor
	3	* The mode has to be repeated because you can't query its
	4	* status
	5	*/
	6
	7	#include <stdio.h>
	8	#include <errno.h>
	9
	10	FILE *
	11	fdopen(fd, mode)
	12	register char *mode;
	13	{
	14	extern int errno;
	15	register FILE *iop;
	16	extern FILE *_lastbuf;
	17
	18	for (iop = _iob; iop->_flag&(_IOREAD\|_IOWRT); iop++)
	19	if (iop >= _lastbuf)
	20	return(NULL);
	21	iop->_cnt = 0;
	22	iop->_file = fd;
	23	if (*mode != 'r') {
	24	iop->_flag \|= _IOWRT;
	25	if (*mode == 'a')
	26	lseek(fd, 0L, 2);
	27	} else
	28	iop->_flag \|= _IOREAD;
	29	return(iop);
	30	}