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Annotation of 3BSD/lib/libNS/fseek.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1979 Regents of the University of California */
        !             2: #include       <stdio.h>
        !             3: 
        !             4: /*
        !             5:  * Seek for standard library.  Coordinates with buffering.
        !             6:  */
        !             7: 
        !             8: long fseek(iop, offset, ptrname)
        !             9: register FILE *iop;
        !            10: long offset;
        !            11: {
        !            12:        register n, resync;
        !            13: 
        !            14:        if (iop->_flag&_IODIRT) {
        !            15:                fflush(iop);
        !            16:                return(lseek(fileno(iop), offset, ptrname));
        !            17:        }
        !            18:        if (iop->_flag&(_IOREAD|_IOWRT)) {
        !            19:                resync = 0;
        !            20:                if (ptrname==1) {       /* relative */
        !            21:                        n = iop->_cnt;
        !            22:                        if (n<0)
        !            23:                                n = 0;
        !            24:                } else {
        !            25:                        n = offset&01;
        !            26:                        resync = n;
        !            27:                }
        !            28:                n = lseek(fileno(iop), offset - n, ptrname);
        !            29:                iop->_cnt = 0;
        !            30:                iop->_ptr = iop->_base ;
        !            31:                iop->_delta = 0;
        !            32:                if (resync)
        !            33:                        getc(iop);
        !            34:                return(n);
        !            35:        }
        !            36:        _error("fseek\n");
        !            37: }
        !            38: 
        !            39: /*  The current character is always iop->_cnt characters behind the current 
        !            40: position in the file, except when a file is open and in use for pure writing
        !            41: in which case it is _IODIRT(y), and will be correctly positioned by fflush */

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