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/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
*/
#define import_spp
#define import_libc
#define import_xnames
#define import_fset
#include <iraf.h>
/* C_SEEK -- FIO seek on a file. If the actual file is a text file the
** seek offset is assumed to have been obtained by a prior call to FTELL
** and is passed on unchanged. If the actual file is a binary file the
** seek offset is a zero-indexed byte offset. This offset is converted
** to a one-indexed XCHAR offset; it is an error if the offset is not
** aligned to an XCHAR word boundary.
*/
int
c_seek (
XINT fd, /* FIO file descriptor */
long offset /* file offset */
)
{
XLONG x_char_offset = offset;
XINT x_fd = fd;
int bypass;
bypass = (offset == BOFL || offset == EOFL
|| c_fstati (fd, F_TYPE) == TEXT_FILE);
if (!bypass) {
x_char_offset /= sizeof(XCHAR);
if ((x_char_offset++ * sizeof(XCHAR)) != offset)
return ((long) ERR);
}
iferr (SEEK (&x_fd, &x_char_offset))
return (ERR);
else
return (OK);
}
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