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Annotation of 41BSD/libc/stdio/ftell.c, revision 1.1

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

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