BSD 4 release
[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);
}