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Groups > comp.lang.c > #112155

Re: isspace() executes without ctype header?

From Ian Collins <ian-news@hotmail.com>
Newsgroups comp.lang.c
Subject Re: isspace() executes without ctype header?
Date 2017-06-14 14:40 +1200
Message-ID <eqbm04F6167U3@mid.individual.net> (permalink)
References <ohq29k$892$1@dont-email.me> <eqbhamF6167U1@mid.individual.net> <ohq3hq$oc4$2@dont-email.me> <eqbi78F6167U2@mid.individual.net> <ohq6rc$i2s$1@dont-email.me>

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On 06/14/17 02:31 PM, DFS wrote:
> On 6/13/2017 9:35 PM, Ian Collins wrote:
>> On 06/14/17 01:33 PM, DFS wrote:
>>> On 6/13/2017 9:20 PM, Ian Collins wrote:
>>>> On 06/14/17 01:13 PM, DFS wrote:
>>>>> Seems strange, but the code compiles (Tiny C on Windows) and runs just
>>>>> fine with only stdio.h and stdlib.h includes.
>>>>>
>>>>> Online resources say ctype.h is the required header (which I didn't
>>>>> know
>>>>> obviously).
>>>>>
>>>>> I compiled the program with Pelles and got warnings:
>>>>>
>>>>> Undeclared function 'isspace' (did you mean 'vsscanf'?); assuming
>>>>> 'extern' returning 'int'.
>>>>>
>>>>>
>>>>> Why is it working without ctype.h?
>>>>
>>>> Do both compilers use system headers. or do they provide their own?
>>>
>>> I already uninstalled Pelles, but it looks like tcc provides their own.
>>> The stdio.h and stdlib.h files in tcc/include both say 'This file is
>>> part of the w64 mingw-runtime package.'
>>
>> So either of the two headers you included probably include <ctype.h>.
>
>
> I checked.  Neither of them reference ctype.h in any way.
>
> Both reference _mingw.h, and the closest thing in _mingw.h is:
>
> typedef unsigned short wctype_t;
> #define _WCTYPE_T_DEFINED

The other responses are a more likely answer (implicit int).

-- 
Ian

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isspace() executes without ctype header? DFS <nospam@dfs.com> - 2017-06-13 21:13 -0400
  Re: isspace() executes without ctype header? Ian Collins <ian-news@hotmail.com> - 2017-06-14 13:20 +1200
    Re: isspace() executes without ctype header? DFS <nospam@dfs.com> - 2017-06-13 21:33 -0400
      Re: isspace() executes without ctype header? Ian Collins <ian-news@hotmail.com> - 2017-06-14 13:35 +1200
        Re: isspace() executes without ctype header? DFS <nospam@dfs.com> - 2017-06-13 22:31 -0400
          Re: isspace() executes without ctype header? Ian Collins <ian-news@hotmail.com> - 2017-06-14 14:40 +1200
  Re: isspace() executes without ctype header? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2017-06-13 21:49 -0400
  Re: isspace() executes without ctype header? Tim Rentsch <txr@alumni.caltech.edu> - 2017-06-13 19:20 -0700
    Re: isspace() executes without ctype header? DFS <nospam@dfs.com> - 2017-06-13 23:04 -0400
      Re: isspace() executes without ctype header? asetofsymbols@gmail.com - 2017-06-13 23:07 -0700
      Re: isspace() executes without ctype header? Tim Rentsch <txr@alumni.caltech.edu> - 2017-06-14 08:26 -0700
        Re: isspace() executes without ctype header? bartc <bc@freeuk.com> - 2017-06-14 17:29 +0100
          Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 09:46 -0700
            Re: isspace() executes without ctype header? bartc <bc@freeuk.com> - 2017-06-14 17:54 +0100
              Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 10:17 -0700
              Re: isspace() executes without ctype header? supercat@casperkitty.com - 2017-06-14 10:48 -0700
                Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 12:03 -0700
                Re: isspace() executes without ctype header? supercat@casperkitty.com - 2017-06-14 12:48 -0700
                Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 13:06 -0700
            Re: isspace() executes without ctype header? Tim Rentsch <txr@alumni.caltech.edu> - 2017-06-16 23:14 -0700
  Re: isspace() executes without ctype header? bartc <bc@freeuk.com> - 2017-06-14 11:18 +0100
    Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 09:35 -0700
      Re: isspace() executes without ctype header? bartc <bc@freeuk.com> - 2017-06-14 17:47 +0100
        Re: isspace() executes without ctype header? supercat@casperkitty.com - 2017-06-14 10:19 -0700
          Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 10:29 -0700
        Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 10:21 -0700
          Re: isspace() executes without ctype header? bartc <bc@freeuk.com> - 2017-06-14 19:12 +0100
            Re: isspace() executes without ctype header? Keith Thompson <kst-u@mib.org> - 2017-06-14 12:12 -0700
            Re: isspace() executes without ctype header? joel.rees@gmail.com - 2017-06-16 17:56 -0700
              Re: isspace() executes without ctype header? supercat@casperkitty.com - 2017-06-17 10:20 -0700
                Re: isspace() executes without ctype header? Robert Wessel <robertwessel2@yahoo.com> - 2017-06-18 00:25 -0500
                Re: isspace() executes without ctype header? supercat@casperkitty.com - 2017-06-19 09:01 -0700
                Re: isspace() executes without ctype header? Robert Wessel <robertwessel2@yahoo.com> - 2017-06-19 21:59 -0500

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