Working on backing files.

Also started a sketches project to illustrate quick ideas.

sketches/enoent.cc

@@ -0,0 +1,93 @@
+///
+/// \file enoent.cc
+/// \author kyle 
+/// \created 2023-10-11
+/// \brief basic file system checks
+///
+/// \section COPYRIGHT
+/// Copyright 2023 K. Isom <kyle@imap.cc>
+///
+/// Permission to use, copy, modify, and/or distribute this software for
+/// any purpose with or without fee is hereby granted, provided that the
+/// above copyright notice and this permission notice appear in all copies.
+///
+/// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+/// WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+/// WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
+/// BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
+/// OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+/// WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+/// ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+/// SOFTWARE.
+///
+#include <algorithm>
+#include <iostream>
+#include <iterator>
+#include <fstream>
+#include <filesystem>
+#include <vector>
+
+
+using namespace std;
+
+
+int
+main()
+{
+	namespace fs = std::filesystem;
+
+	std::string          input = "ohai\n";
+	std::vector<uint8_t> buffer(input.begin(), input.end());
+	auto                 f     = fs::path("ENOENT2");
+
+	if (fs::exists(f)) {
+		std::cout << "[+] the file exists\n";
+		std::cout << "\tfile size: " << fs::file_size(f) << "\n";
+	} else {
+		std::cout << "the file does not exist\n";
+	}
+	cout << "[+] attempting to open the file.\n";
+	ofstream handle(f, std::ios::in | std::ios::out | std::ios::trunc);
+
+	if (!handle.good()) {
+		cerr << "[!] file operation failed\n";
+		cerr << "\tfile fail: " << handle.fail() << "\n";
+		cerr << "\t file eof: " << handle.eof() << "\n";
+		cerr << "\t file bad: " << handle.bad() << "\n";
+		return 1;
+	}
+
+	if (fs::exists(f)) {
+		std::cout << "[+] the file exists\n";
+		std::cout << "\tfile size: " << fs::file_size(f) << "\n";
+	} else {
+		std::cout << "the file does not exist\n";
+	}
+	handle.flush();
+	if (fs::exists(f)) {
+		std::cout << "[+] the file exists\n";
+		std::cout << "\tfile size: " << fs::file_size(f) << "\n";
+	} else {
+		std::cout << "the file does not exist\n";
+	}
+	cout << "[+] file open successfully. attempting to write.\n";
+	handle << "Hello, world.\r\n";
+
+	if (fs::exists(f)) {
+		std::cout << "\tfile size: " << fs::file_size(f) << "\n";
+	}
+
+	cout << "[+] attempting to write the vector to file.\n";
+
+	std::copy(buffer.begin(), buffer.end(), std::ostream_iterator<uint8_t>(handle, ""));
+
+	cout << "[+] closing the file.\n";
+	handle.close();
+
+	if (fs::exists(f)) {
+		std::cout << "\tfile size: " << fs::file_size(f) << "\n";
+	}
+
+	return 0;
+
+}