Path: csiph.com!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: scanf used for to get a line
Date: Thu, 03 Nov 2016 09:38:56 -0700
Organization: None to speak of
Lines: 26
Message-ID: <lnfun8zffj.fsf@kst-u.example.com>
References: <15ea8d6d-0173-491c-b6b5-b1c57dd61769@googlegroups.com> <236c25a6-8c18-4082-ab3a-86eb55fb2408@googlegroups.com> <nvfoa6$lsu$1@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Injection-Info: mx02.eternal-september.org; posting-host="1f4b9cbd880ce3f40faed57282e3b9ef"; logging-data="4348"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+S0MRLQLwAaJVnM5wPVGKH"
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)
Cancel-Lock: sha1:eOa84vQx7lpX0tYbnjwqmK5rmMg= sha1:X01nY+aZFBBSMOvlp9TY2kZRzyo=
Xref: csiph.com comp.lang.c:95663

"Charles Richmond" <numerist@aquaporin4.com> writes:
> <mark.bluemel@gmail.com> wrote in message 
> news:236c25a6-8c18-4082-ab3a-86eb55fb2408@googlegroups.com...
>> On Tuesday, 1 November 2016 08:50:54 UTC, asetof...@gmail.com  wrote:
>>> What about:
>>> char a[1024], c;
>>> int w, r;
>>> r=scanf("%1024[^\n]%c",a,&c);
>>> if(r<1)error();
>>> in the case \n is 2 characters?
>>
>> Scanf to read a line is a poor choice, but you need to understand that a
>> text stream, like stdin, will have platform specific line endings mapped
>> to a single character represented as '\n'
>>
>
> You might have fewer problems if you read the line with "fgets()" and then 
> use "sscanf()" to parse out the results.

But be careful.  sscanf() has undefined behavior on numeric overflow.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"