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Annotation of 42BSD/lib/libc/stdio/fdopen.c, revision 1.1

1.1     ! root        1: /* @(#)fdopen.c        4.4 (Berkeley) 9/12/83 */
        !             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:        if ((unsigned)fd >= getdtablesize())
        !            20:                return (NULL);
        !            21:        for (iop = _iob; iop->_flag&(_IOREAD|_IOWRT|_IORW); )
        !            22:                if (++iop >= _lastbuf)
        !            23:                        return(NULL);
        !            24:        iop->_cnt = 0;
        !            25:        iop->_file = fd;
        !            26:        if (*mode != 'r') {
        !            27:                iop->_flag |= _IOWRT;
        !            28:                if (*mode == 'a')
        !            29:                        lseek(fd, 0L, 2);
        !            30:        } else
        !            31:                iop->_flag |= _IOREAD;
        !            32:        if (mode[1] == '+') {
        !            33:                iop->_flag &= ~(_IOREAD|_IOWRT);
        !            34:                iop->_flag |= _IORW;
        !            35:        }
        !            36:        return(iop);
        !            37: }

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