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From: Richard Harnden <richard.nospam@gmail.invalid>
Newsgroups: comp.lang.c
Subject: Re: Running an editor from ANSI C
Date: Fri, 7 Jun 2024 20:08:03 +0100
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On 07/06/2024 19:52, Malcolm McLean wrote:
> 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?

C11, I think.


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