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Annotation of coherent/b/lib/libc/XSTDIO/fseek.c, revision 1.1.1.1

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

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