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|---|---|
| From | Keith Thompson <kst-u@mib.org> |
| Newsgroups | comp.lang.c |
| Subject | Re: Some ideas about c? |
| Date | Fri, 19 May 2017 11:59:24 -0700 |
| Organization | None to speak of |
| Lines | 49 |
| Message-ID | <ln37c01xmb.fsf@kst-u.example.com> (permalink) |
| References | <ofibhs$1o9a$4@adenine.netfront.net> <def3568f-161d-40ac-98c3-dc94a09ba2f6@googlegroups.com> <C++-20170518184518@ram.dialup.fu-berlin.de> <ZElTA.135188$uG1.80502@fx08.iad> <87bmqp7utb.fsf@gmail.com> <MGBTA.105515$MW5.55925@fx36.iad> <48eb1c1f-c162-45ff-b7ce-74108ee6c522@googlegroups.com> <lnbmqo22tp.fsf@kst-u.example.com> <87h90gix34.fsf@bsb.me.uk> |
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Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
> Keith Thompson <kst-u@mib.org> writes:
>> supercat@casperkitty.com writes:
>>> On Friday, May 19, 2017 at 7:38:13 AM UTC-5, Scott Lurndal wrote:
>>>> Gareth Owen writes:
>>>> >scott writes:
>>>> >
>>>> >> int main() { char buffer[512]; fputs(fgets(buffer, sizeof(buffer),
>>>> >> stdin), stdout); }
>>>> >
>>>> >Great. Except it doesn't work if the input line is too big.
>>>>
>>>> Sure it does. It just truncates it. And the programmer is, of
>>>> course, aware of that.
>>>
>>> It doesn't truncate lines; it wraps them. Sometimes that's desirable, and
>>> sometimes not. A function which behaved like fgets() but provided a choice
>>> of behaviors (truncate, wrap, or trap/signal) would have been helpful, but
>>> fgets is what it is.
>>
>> No, it doesn't wrap.
>>
>> The program reads and prints a single line, discarding any remaining
>> input. If the line is longer than 512 characters, including the
>> trailing newline, it prints only the first 512 characters and discards
>> the rest. (Which means that the output might not contain a terminating
>> newline even if the input does.)
>
> I found this description a bit confusing so I'll offer a clarification.
> Instead of "and discards the rest" I'd say "and leaves the rest to be
> read by later input calls".
>
> Discarded input sounds to me like input lost forever.
Yes, the input is lost forever when the program (shown above in its
entirety but missing `#include <stdio.h>` terminates.
I suppose another program executed after this one could read the input,
but that's outside the scope of C.
I think people are assuming that the fputs(fgets(...)) line is meant to
be part of some larger program. I'm not making that assumption, and the
original problem description doesn't imply it.
--
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"
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Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-17 23:23 +0300
Re: Some ideas about c? Ian Collins <ian-news@hotmail.com> - 2017-05-18 08:40 +1200
Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-17 23:00 +0200
Re: Some ideas about c? supercat@casperkitty.com - 2017-05-17 14:59 -0700
Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 00:08 +0200
Re: Some ideas about c? supercat@casperkitty.com - 2017-05-17 22:09 -0700
Re: Some ideas about c? Ian Collins <ian-news@hotmail.com> - 2017-05-18 18:22 +1200
Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 12:36 +0200
Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 03:53 -0700
Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 14:24 +0200
Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 08:37 -0400
Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 05:47 -0700
Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 15:20 +0200
Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 06:28 -0700
Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-18 13:56 +0000
Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 16:30 +0200
Re: Some ideas about c? Thiago Adams <thiago.adams@gmail.com> - 2017-05-18 07:45 -0700
Re: Some ideas about c? Richard Heathfield <rjh@cpax.org.uk> - 2017-05-18 16:08 +0100
Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 08:15 -0700
Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 11:46 -0400
Re: Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-18 21:33 +0300
Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 15:29 -0400
Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-19 01:23 +0200
Re: Some ideas about c? Thiago Adams <thiago.adams@gmail.com> - 2017-05-18 18:12 -0700
Re: Some ideas about c? Thiago Adams <thiago.adams@gmail.com> - 2017-05-18 10:08 -0700
Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-19 00:39 +0200
Re: Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-19 14:27 +0300
Re: Some ideas about c? David Brown <david.brown@hesbynett.no> - 2017-05-19 13:41 +0200
Re: Some ideas about c? Richard Heathfield <rjh@cpax.org.uk> - 2017-05-19 13:04 +0100
Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 10:00 -0700
Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-19 14:14 +0200
Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 11:33 -0400
Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 08:47 -0700
Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 08:48 -0700
Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 09:02 -0700
Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 10:52 -0700
Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 15:35 -0400
Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 14:01 -0700
Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 17:38 -0400
Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 15:54 -0700
Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 22:17 -0400
Re: Some ideas about c? John Bode <jfbode1029@gmail.com> - 2017-05-18 08:06 -0700
Re: Some ideas about c? John Bode <jfbode1029@gmail.com> - 2017-05-18 09:17 -0700
Re: Some ideas about c? fir <profesor.fir@gmail.com> - 2017-05-17 14:34 -0700
Re: Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-18 16:16 +0300
Re: Some ideas about c? Cholo Lennon <chololennon@hotmail.com> - 2017-05-18 10:26 -0300
Re: Some ideas about c? John Bode <jfbode1029@gmail.com> - 2017-05-18 07:36 -0700
Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-18 18:23 +0000
Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-18 21:51 +0100
Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 12:38 +0000
Re: Some ideas about c? supercat@casperkitty.com - 2017-05-19 07:44 -0700
Re: Some ideas about c? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-19 16:45 +0100
Re: Some ideas about c? Tim Rentsch <txr@alumni.caltech.edu> - 2017-05-19 21:59 -0700
Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 10:06 -0700
Re: Some ideas about c? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-19 18:18 +0100
Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 11:59 -0700
Re: Some ideas about c? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-19 21:05 +0100
Re: Some ideas about c? "James R. Kuyper" <jameskuyper@verizon.net> - 2017-05-19 12:42 -0400
Re: Some ideas about c? Richard Heathfield <rjh@cpax.org.uk> - 2017-05-19 17:54 +0100
Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 18:52 +0100
Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 18:51 +0100
Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 18:55 +0000
Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 19:58 +0100
Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 12:12 -0700
Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 12:01 -0700
Re: Some ideas about c? Ian Collins <ian-news@hotmail.com> - 2017-05-19 08:22 +1200
Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-18 21:53 +0100
Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 12:36 +0000
Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 18:54 +0100
Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 18:58 +0000
Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 12:18 -0700
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