0.0.002

ddat interop with dat js
cable interop with cabal js
ddat's frontend = dat-thang
cable fe = cable-thang
dillo support based on cel's dillo-dat
bootstrap node
xplatform support

Signed-off-by: divo <418@cryspace.space>

inc/dat_paths.h

@@ -0,0 +1,48 @@
+#ifndef DAT_PATHS_H
+#define DAT_PATHS_H
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+/* Return the user's home directory across POSIX shells and native Windows
+ * launches. Windows GUI starts commonly have USERPROFILE but no HOME. */
+static inline const char *dat_home_directory(void)
+{
+	const char *home = getenv("HOME");
+	if (home && *home) return home;
+#ifdef _WIN32
+	home = getenv("USERPROFILE");
+	if (home && *home) return home;
+	{
+		const char *drive = getenv("HOMEDRIVE");
+		const char *path = getenv("HOMEPATH");
+		static char combined[1024];
+		int n;
+		if (!drive || !*drive || !path || !*path) return NULL;
+		n = snprintf(combined, sizeof(combined), "%s%s", drive, path);
+		return n >= 0 && (size_t)n < sizeof(combined) ? combined : NULL;
+	}
+#else
+	return NULL;
+#endif
+}
+
+/* POSIX rename replaces an existing file; Windows rename does not. These
+ * state files are written to a sibling temporary file before replacement. */
+static inline int dat_replace_file(const char *temporary, const char *destination)
+{
+#ifdef _WIN32
+	if (MoveFileExA(temporary, destination,
+			MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH)) return 0;
+	errno = EIO;
+	return -1;
+#else
+	return rename(temporary, destination);
+#endif
+}
+
+#endif