1 /* @(#)fdopen.c 4.1 (Berkeley) 12/21/80 */ 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 } 32