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From: Malcolm McLean <malcolm.arthur.mclean@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: Running an editor from ANSI C
Date: Fri, 7 Jun 2024 19:52:22 +0100
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On 07/06/2024 18:56, Janis Papanagnou wrote:
> On 07.06.2024 14:57, Malcolm McLean wrote:
>> On 07/06/2024 10:37, Keith Thompson wrote:
>>> Malcolm McLean <malcolm.arthur.mclean@gmail.com> writes:
>>>>
>>>> Ah thank you. But then main has to take an extra parameter. Now  will
>>>> the shell still be absolutely robust, and completely portable, and run
>>>> just anywhere?
>>>
>>> What?  Why would main need an extra parameter?
>>>
>> Hre's the main function for the shell.
>>
>> int main(int argc, char **argv)
>> {
> [...]
>> }
>>
>> Now to get the $EDITOR variable I will have to modify this function.
>>
>> int main(int argc, char **argv, char **envp)
>>
>> Now what are the implications of doing that? [...]
> 
> I'm certainly not the most qualified person to answer that, so
> just two comments...
> Declaring the extra parameter doesn't spoil the code, does it?
> (If you don't use it you don't need to specify it. If you have
> declared it you can use it or not.)
> Personally my first reflex would be to use a dedicated function
> to obtain a specific environment variable, specifically getenv();
> I thought it wouldn't require the 'envp' to work?
> 
> For me it works
> 
>    #include <stdlib.h>
>    #include <stdio.h>
>    void main (int argc, char * argv[])
>    {
>        printf ("%s\t%s\n", argv[1], getenv(argv[1]));
>    }
> 
> 
> Janis
> 
Is getenv() standard now? When did it come in?
-- 
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