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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <config.h>
include <syserr.h>
include <fio.h>
# GETLINE -- Get a line of text from a file. If file buffer is empty and
# file is a text file, read line directly into the buffer supplied by the
# calling procedure. If text is buffered, copy characters out of file buffer
# into the output buffer until the newline character is encountered. Refill
# buffer as necessary. Note IOP, ITOP are moved into local variables to
# optimize the loop. The fd values must be updated before calling FILBUF
# and upon exit from the loop.
int procedure getline (fd, linebuf)
int fd # input file
char linebuf[ARB] # output line buffer (>= SZ_LINE)
bool pushback
char ch
pointer ip, ip_top, op
int maxch, status
int filbuf(), and()
errchk filbuf, filerr
include <fio.com>
begin
fp = fiodes[fd]
if (fd <= 0 || fp == NULL)
call filerr (FNAME(fp), SYS_FILENOTOPEN)
pushback = (and (fflags[fd], FF_PUSHBACK) != 0)
if (FTYPE(fp) == TEXT_FILE && iop[fd] == itop[fd] && !pushback) {
# Get next line from text file, initialize pointers. In raw mode
# we only read one character at a time.
if (and (FF_RAW, fflags[fd]) == 0)
maxch = SZ_LINE
else
maxch = 1
call zcall4 (ZGETTX(fp), FCHAN(fp), linebuf, maxch, status)
if (status == ERR)
call filerr (FNAME(fp), SYS_FREAD)
op = max (0, status+1)
} else {
op = 1
ip = iop[fd] # loop optimization stuff
ip_top = itop[fd]
if (ip < bufptr[fd])
goto 10
while (op <= SZ_LINE) {
if (ip >= ip_top) {
iop[fd] = ip
10 status = filbuf (fd)
ip = iop[fd]
ip_top = itop[fd]
if (status <= 0)
break
}
ch = Memc[ip]
linebuf[op] = ch
ip = ip + 1
op = op + 1
if (ch == '\n')
break
}
iop[fd] = ip
}
if (op <= 1) {
FNCHARS(fp) = 0
return (EOF)
} else {
FNCHARS(fp) = op - 1
linebuf[op] = EOS
return (op - 1) # number of chars read
}
end
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