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Annotation of coherent/b/lib/libc/stdio/fseek.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * libc/stdio/fseek.c
        !             3:  * ANSI-compliant C standard i/o library.
        !             4:  * fseek()
        !             5:  * ANSI 4.9.9.2.
        !             6:  * Seek to offset from whence in stream.
        !             7:  */
        !             8: 
        !             9: #include <stdio.h>
        !            10: #include "stdio.int.h"
        !            11: 
        !            12: int
        !            13: fseek(stream, offset, whence) register FILE *stream; long offset; int whence;
        !            14: {
        !            15:        register _FILE2 *f2p;
        !            16: 
        !            17:        f2p = stream->_f2p;
        !            18: 
        !            19:        /* Adjust offset for ungotten character if necessary. */
        !            20:        if ((whence == SEEK_CUR) && (stream->_ff2 & _FUNGOT))
        !            21:                offset--;
        !            22: 
        !            23:        /* Ensure buffer is clean. */
        !            24:        if (_fpseek(stream)==EOF)
        !            25:                return EOF;
        !            26: 
        !            27:        /* Perform the seek. */
        !            28:        if ((offset=lseek(fileno(stream), offset, whence)) == -1L)
        !            29:                return EOF;
        !            30: 
        !            31:        /* Reset buffer pointers if necessary. */
        !            32:        if (f2p->_bp != NULL)
        !            33:                f2p->_dp = stream->_cp = f2p->_bp + (unsigned)offset%(unsigned)(f2p->_ep - f2p->_bp);
        !            34: 
        !            35:        /* If the file was opened for append, force seek to end on write. */
        !            36:        if ((stream->_ff2 & _FAPPND) && (offset != 0L || whence == SEEK_SET))
        !            37:                f2p->_pt = &_fputa;
        !            38: 
        !            39:        /* Clear EOF flag. */
        !            40:        stream->_ff1 &= ~_FEOF;
        !            41: 
        !            42:        return 0;
        !            43: }
        !            44: 
        !            45: /* end of libc/stdio/fseek.c */

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