Re: Inconsistent line counts from 3 methods

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From	Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups	comp.lang.c
Subject	Re: Inconsistent line counts from 3 methods
Date	Sun, 29 Nov 2020 00:21:46 -0800
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Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:

> DFS <nospam@dfs.com> writes:
>
>> On 10/11/2020 8:26 PM, Keith Thompson wrote:
>
> [...]
>
>>> If you only care about *how many* lines are in your input, there's
>>> no point in using fgets().  Just read a character or a block at
>>> a time and scan for '\n' characters (and *maybe* apply special
>>> handling if the last character read isn't '\n').
>>
>> Why maybe?  Shouldn't you test every time, and add one to your
>> linecount if the last character before EOF isn't \n?
>
> Because it depends on how you choose to define a "line".
>
> Consider a 7-byte file containing "foo", a newline, and "bar" without a
> newline.  Does it have 1 line or 2?
>
> For a C implementation in which the last line does not require a
> terminating new-line character (N1570 7.21.2p2), it has two lines.
> For a C implementation that does require a new-line on the last line,
> it's not a well formed text file.  [...]

It seems a reasonable guess that C implementations allow a last
line without a terminating newline characters if and only if the
underlying operating system supports that.  If that is so then
there is no ambiguity as far as C implementations are concerned.

Thread

Inconsistent line counts from 3 methods DFS <nospam@dfs.com> - 2020-10-10 22:37 -0400
  Re: Inconsistent line counts from 3 methods Barry Schwarz <schwarzb@delq.com> - 2020-10-10 22:06 -0700
    Re: Inconsistent line counts from 3 methods DFS <nospam@dfs.com> - 2020-10-11 10:38 -0400
      Re: Inconsistent line counts from 3 methods Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-10-11 15:36 +0000
        Re: Inconsistent line counts from 3 methods DFS <nospam@dfs.com> - 2020-10-11 13:51 -0400
          Re: Inconsistent line counts from 3 methods Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-10-11 18:33 +0000
            Re: Inconsistent line counts from 3 methods DFS <nospam@dfs.com> - 2020-10-11 15:20 -0400
              Re: Inconsistent line counts from 3 methods Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-10-11 19:40 +0000
                Re: Inconsistent line counts from 3 methods DFS <nospam@dfs.com> - 2020-10-11 15:47 -0400
                Re: Inconsistent line counts from 3 methods James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-11 16:35 -0400
                Re: NNTP message requirements (Was: Inconsistent line counts from 3 methods) Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-10-11 21:13 +0000
                Re: NNTP message requirements (Was: Inconsistent line counts from 3 methods) DFS <nospam@dfs.com> - 2020-10-11 18:45 -0400
                Re: NNTP message requirements Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-11 17:11 -0700
              Re: Inconsistent line counts from 3 methods James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-11 16:27 -0400
                Re: Inconsistent line counts from 3 methods Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-10-11 23:30 +0100
                Re: Inconsistent line counts from 3 methods James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-11 23:56 -0400
          Re: Inconsistent line counts from 3 methods James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-11 14:53 -0400
            Re: Inconsistent line counts from 3 methods DFS <nospam@dfs.com> - 2020-10-11 15:15 -0400
            Re: Inconsistent line counts from 3 methods Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-10-14 20:08 +0000
              Re: Inconsistent line counts from 3 methods James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-14 16:58 -0400
                Re: Inconsistent line counts from 3 methods Eli the Bearded <*@eli.users.panix.com> - 2020-10-14 23:37 +0000
                Re: Inconsistent line counts from 3 methods Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-14 17:25 -0700
                Re: Inconsistent line counts from 3 methods Eli the Bearded <*@eli.users.panix.com> - 2020-10-15 01:55 +0000
                Re: Inconsistent line counts from 3 methods Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-10-17 19:19 +0000
                Re: Inconsistent line counts from 3 methods Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-10-17 19:10 +0000
                Re: Inconsistent line counts from 3 methods Kaz Kylheku <793-849-0957@kylheku.com> - 2020-10-17 19:36 +0000
          Re: Inconsistent line counts from 3 methods Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-10-14 20:16 +0000
        Re: Inconsistent line counts from 3 methods Barry Schwarz <schwarzb@delq.com> - 2020-10-11 11:36 -0700
          Re: Inconsistent line counts from 3 methods James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-11 15:12 -0400
    Re: Inconsistent line counts from 3 methods James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-11 12:16 -0400
  Re: Inconsistent line counts from 3 methods Johann Klammer <klammerj@NOSPAM.a1.net> - 2020-10-11 15:18 +0200
    Re: Inconsistent line counts from 3 methods Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-10-11 14:31 +0000
    Re: Inconsistent line counts from 3 methods Barry Schwarz <schwarzb@delq.com> - 2020-10-11 11:31 -0700
    Re: Inconsistent line counts from 3 methods Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-10-11 23:15 +0100
  Re: Inconsistent line counts from 3 methods Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-11 14:00 -0700
    Re: Inconsistent line counts from 3 methods DFS <nospam@dfs.com> - 2020-10-11 17:47 -0400
      Re: Inconsistent line counts from 3 methods Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-11 17:26 -0700
        Re: Inconsistent line counts from 3 methods DFS <nospam@dfs.com> - 2020-10-12 13:11 -0400
          Re: Inconsistent line counts from 3 methods Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-12 10:56 -0700
            Re: Inconsistent line counts from 3 methods Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-11-29 00:21 -0800
          Re: Inconsistent line counts from 3 methods scott@slp53.sl.home (Scott Lurndal) - 2020-10-12 19:19 +0000
            Re: Inconsistent line counts from 3 methods dfs <nospam@dfs.com> - 2020-10-12 18:53 -0400
              Re: Inconsistent line counts from 3 methods Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-10-17 23:09 +0000
                Re: Inconsistent line counts from 3 methods Bart <bc@freeuk.com> - 2020-10-18 00:24 +0100
                Re: Inconsistent line counts from 3 methods Kaz Kylheku <793-849-0957@kylheku.com> - 2020-10-18 16:56 +0000
                Re: Inconsistent line counts from 3 methods James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-20 09:17 -0400
                Re: Inconsistent line counts from 3 methods Bart <bc@freeuk.com> - 2020-10-20 15:48 +0100

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