How to use C code in D
Dillen Meijboom via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Thu Mar 23 11:10:20 PDT 2017
Hi there,
I'm learning D for a while because it's really easy to use C-code
in D.
The problem is that I don't really get how to deal with the data
structures defined in C in D.
At one time for instance I've tried to get all environment
variables on a POSIX system. I succeeded but I think it can be
done way easier.
So my question basically is:
1. How can I learn to use C code in D? Is there any good tutorial
or other packages that deal with this a lot?
2. Is the way I'm currently doing it okay or is it wrong and do I
need to do something else?
As a reference, I'm currently using the following D code to get
all environment variables:
```
import std.array;
import std.conv: to;
import std.string: fromStringz;
extern (C) extern const char** environ;
string[string] getenv() {
string[string] env;
char* line;
for (auto data = cast(char**)environ; (line = *data) != null;
++data) {
auto keyval = to!string(fromStringz(line)).split('=');
env[keyval[0]] = keyval[1];
}
return env;
}
```
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