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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include <config.h>
include <fio.h>
# FFILSZ -- Return file size in chars. When first called, the status
# z-routine for the channel is called to get the file size. Thereafter,
# FIO keeps track of the file size.
long procedure ffilsz (fd)
int fd
long file_size
include <fio.com>
begin
fp = fiodes[fd]
UPDATE_IOP(fd) # update i/o pointers
switch (FTYPE(fp)) {
case TEXT_FILE:
call zcall3 (ZSTTTX(fp), FCHAN(fp), FSTT_FILSIZE, file_size)
file_size = file_size + (otop[fd] - bufptr[fd])
case STRING_FILE, SPOOL_FILE:
file_size = otop[fd] - bufptr[fd]
default:
# Call channel status z-routine to get file size if this is the
# first request. Thereafter, FIO keeps track of file size.
# Beware that FILSIZE (updated by AWRITE or by us) does not
# necessarily include data just recently written into the current
# buffer.
if (FILSIZE(fp) < 0) {
call zcall3 (ZSTTBF(fp), FCHAN(fp), FSTT_FILSIZE, file_size)
file_size = (file_size + SZB_CHAR-1) / SZB_CHAR
} else
file_size = FILSIZE(fp)
# If writing at EOF (or first block of a new file), and the file
# buffer has not yet been flushed, the file size is the buffer
# offset minus one (number of chars written to disk) plus the
# number of chars in the file buffer.
if (BUF_MODIFIED(fd))
file_size = max (file_size,
boffset[fd]-1 + (itop[fd] - bufptr[fd]))
}
FILSIZE(fp) = file_size # update fildes
return (file_size)
end
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