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Annotation of researchv10dc/libI77/notused/ftell.c, revision 1.1

1.1     ! root        1: /*     @(#)ftell.c     1.2     */
        !             2: /*     3.0 SID #       1.2     */
        !             3: /*LINTLIBRARY*/
        !             4: /*
        !             5:  * Return file offset.
        !             6:  * Coordinates with buffering.
        !             7:  */
        !             8: #include <stdio.h>
        !             9: 
        !            10: extern long lseek();
        !            11: 
        !            12: long
        !            13: ftell(iop)
        !            14: FILE   *iop;
        !            15: {
        !            16:        long    tres;
        !            17:        register int adjust;
        !            18: 
        !            19:        if(iop->_cnt < 0)
        !            20:                iop->_cnt = 0;
        !            21:        if(iop->_flag & _IOREAD)
        !            22:                adjust = - iop->_cnt;
        !            23:        else if(iop->_flag & (_IOWRT | _IORW)) {
        !            24:                adjust = 0;
        !            25:                if(iop->_flag & _IOWRT && iop->_base &&
        !            26:                                        (iop->_flag & _IONBF) == 0)
        !            27:                        adjust = iop->_ptr - iop->_base;
        !            28:        } else
        !            29:                return(-1);
        !            30:        tres = lseek(fileno(iop), 0L, 1);
        !            31:        if(tres >= 0)
        !            32:                tres += (long)adjust;
        !            33:        return(tres);
        !            34: }

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