1. Re: Dropping last character (Was: (No Subject))
>If you can give me an example where gets()
>fails (drops the last line), I'd be happy to investigate.
>
>gets() is supposed to return the whole line including '\n'
>if there is one. The last line in a file might not have
>a '\n', so gets() will return all the characters on that line,
>but there won't be a '\n' on the end.
>
>Some editors do funny things when the last line in
>your file does not end with '\n'. ed.ex will
>add a '\n' to your line. ee.ex seems to
>drop the last character on the line that's missing the \n.
>Are you reading David? I tried:
>
>junk.ex:
>puts(1, "line1\nline2") -- missing final \n
>
>ex junk >junk.dat
>
>ex ee junk.dat
>
>and found the '2' in line2 was missing.
I can see what's happening here. It's normal to see something like:
while 1 do
junk = gets(fn)
if not atom(junk) then
line = line & {junk[1..length(junk)-1]}
else
exit
end if
end while
Notice how the last character is chopped off? It's an assumed \n. In the
case of a last line without a \n, as Rob just showed, the entire line is
read, but there isn't any \n to read, so it isn't added. The code should
do something like this (but would be slower, seeing as it would only do
anything on the last line, but we don't know where the last line is, so
we always need to do the check):
while 1 do
junk = gets(fn)
if not atom(junk) then
if junk[length(junk)] != '\n' then
junk = junk & '\n' -- Add \n for the next check
end if
line = line & {junk[1..length(junk)-1]}
else
exit
end if
end while
This will prevent the last character from being chopped off if there
isn't a \n at the end of file.
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