X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;ds=sidebyside;f=source%2Ffs%2Funix%2Futils.cpp;fp=source%2Ffs%2Funix%2Futils.cpp;h=c832343f76e822bacf4184ddc11379f750ee950d;hb=609c9a508cfdc7b42c46c4f21d17639204165a00;hp=0000000000000000000000000000000000000000;hpb=b4806214e905752617691f851717033fd3f266c2;p=libs%2Fcore.git

diff --git a/source/fs/unix/utils.cpp b/source/fs/unix/utils.cpp
new file mode 100644
index 0000000..c832343
--- /dev/null
+++ b/source/fs/unix/utils.cpp
@@ -0,0 +1,65 @@
+#include <cstdio>
+#include <unistd.h>
+#include <msp/core/systemerror.h>
+#include "dir.h"
+#include "stat.h"
+#include "utils.h"
+
+using namespace std;
+
+namespace Msp {
+namespace FS {
+
+Path readlink(const Path &link)
+{
+	char buf[4096];
+	int len = ::readlink(link.c_str(), buf, sizeof(buf));
+	if(len==-1)
+		throw system_error("readlink");
+	return string(buf, len);
+}
+
+Path realpath(const Path &path)
+{
+	list<string> queue(path.begin(), path.end());
+	if(!path.is_absolute())
+	{
+		Path cwd = getcwd();
+		queue.insert(queue.begin(), cwd.begin(), cwd.end());
+	}
+
+	Path real;
+	unsigned n_links = 0;
+	while(!queue.empty())
+	{
+		Path next = real/queue.front();
+		queue.pop_front();
+
+		if(is_link(next))
+		{
+			if(++n_links>64)
+				throw runtime_error("too many symbolic links");
+			Path link = readlink(next);
+			queue.insert(queue.begin(), link.begin(), link.end());
+		}
+		else
+			real = next;
+	}
+
+	return real;
+}
+
+void rename(const Path &from, const Path &to)
+{
+	if(::rename(from.c_str(), to.c_str())==-1)
+		throw system_error("rename");
+}
+
+void unlink(const Path &path)
+{
+	if(::unlink(path.c_str())==-1)
+		throw system_error("unlink");
+}
+
+} // namespace FS
+} // namespace Msp