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

/* @(#)fdopen.c	4.1 (Berkeley) %G% */
/*
 * 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
39195eb1 BJ	1	/* @(#)fdopen.c 4.1 (Berkeley) %G% */
	2	/*
	3	* Unix routine to do an "fopen" on file descriptor
	4	* The mode has to be repeated because you can't query its
	5	* status
	6	*/
	7
	8	#include <stdio.h>
	9	#include <errno.h>
	10
	11	FILE *
	12	fdopen(fd, mode)
	13	register char *mode;
	14	{
	15	extern int errno;
	16	register FILE *iop;
	17	extern FILE *_lastbuf;
	18
	19	for (iop = _iob; iop->_flag&(_IOREAD\|_IOWRT); iop++)
	20	if (iop >= _lastbuf)
	21	return(NULL);
	22	iop->_cnt = 0;
	23	iop->_file = fd;
	24	if (*mode != 'r') {
	25	iop->_flag \|= _IOWRT;
	26	if (*mode == 'a')
	27	lseek(fd, 0L, 2);
	28	} else
	29	iop->_flag \|= _IOREAD;
	30	return(iop);
	31	}