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From: Bonita Montero <Bonita.Montero@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: Command line globber/tokenizer library for C?
Date: Thu, 12 Sep 2024 17:08:24 +0200
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Am 10.09.2024 um 21:01 schrieb Ted Nolan <tednolan>:

> I have the case where my C program is handed a string which is basically
> a command line.

I tried to experiment with that with /proc/<pid>/cmdline. The first
problem was that the arguments aren't space delimited, but broken up
with zeroes. The second problem was the cmdline-file doesn't contain
the original commandline but with expanded files.
This was my code so far:

#include <iostream>
#include <fstream>
#include <sstream>
#include <algorithm>
#include <unistd.h>

using namespace std;

int main()
{
	pid_t pid = getpid();
	string cmdLineFile( (ostringstream() << "/proc/" << pid << 
"/cmdline").str() );
	ifstream ifs;
	ifs.exceptions( ifstream::failbit | ifstream::badbit );
	ifs.open( cmdLineFile );
	string fullCmdLine;
	ifs >> fullCmdLine;
	ifs.close();
	replace( fullCmdLine.begin(), fullCmdLine.end(), (char)0, (char)' ' );
	cout << fullCmdLine << endl;
}