39 lines
814 B
C
39 lines
814 B
C
#include <stdio.h>
|
|
|
|
|
|
fseek(iop, offset, where)
|
|
FILE *iop;
|
|
long offset;
|
|
{
|
|
int count;
|
|
long lseek();
|
|
long pos;
|
|
|
|
iop->_flags &= ~(IO_EOF | IO_ERR);
|
|
/* Clear both the end of file and error flags */
|
|
|
|
if ( io_testflag(iop,IO_READMODE) ) {
|
|
if ( where < 2 && iop->_buf && !io_testflag(iop,IO_UNBUFF) ) {
|
|
count = iop->_count;
|
|
pos = offset;
|
|
|
|
if ( where == 0 )
|
|
pos += count - lseek(fileno(iop), 0L,1);
|
|
else
|
|
offset -= count;
|
|
|
|
if ( count > 0 && pos <= count
|
|
&& pos >= iop->_buf - iop->_ptr ) {
|
|
iop->_ptr += (int) pos;
|
|
iop->_count -= (int) pos;
|
|
return(0);
|
|
}
|
|
}
|
|
pos = lseek(fileno(iop), offset, where);
|
|
iop->_count = 0;
|
|
} else if ( io_testflag(iop,IO_WRITEMODE) ) {
|
|
fflush(iop);
|
|
pos = lseek(fileno(iop), offset, where);
|
|
}
|
|
return((pos == -1) ? -1 : 0 );
|
|
}
|