X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=blobdiff_plain;f=source%2Futils.cpp;h=a0c2486f17402593b2e48199fc9d689923098809;hp=0ca1d6064e1bd2cfcfa48bd8a3b649efc7333ca0;hb=1834fcf2465c77c387bc92df5529d8631abaffa5;hpb=4dda68c467fe1e759e0d67e4ec844ac0130e6127

diff --git a/source/utils.cpp b/source/utils.cpp
index 0ca1d60..a0c2486 100644
--- a/source/utils.cpp
+++ b/source/utils.cpp
@@ -15,6 +15,7 @@ Distributed under the LGPL
 #include <msp/strings/utils.h>
 #include "dir.h"
 #include "path.h"
+#include "stat.h"
 #include "utils.h"
 
 using namespace std;
@@ -78,6 +79,57 @@ Path fix_case(const Path &path)
 	return result;
 }
 
+Path readlink(const Path &link)
+{
+#ifdef WIN32
+	throw Exception("No symbolic links on win32");
+#else
+	char buf[4096];
+	int len=::readlink(link.str().c_str(), buf, sizeof(buf));
+	if(len==-1)
+		throw SystemError("readlink failed", errno);
+	return string(buf, len);
+#endif
+}
+
+Path realpath(const Path &path)
+{
+#ifdef WIN32
+	if(path.is_absolute())
+		return path;
+	else
+		return getcwd()/path;
+#else
+	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();
+
+		struct stat st=lstat(next);
+		if(S_ISLNK(st.st_mode))
+		{
+			if(++n_links>64)
+				throw Exception("Ludicrous amount of symlinks detected in realpath, giving up");
+			Path link=readlink(next);
+			queue.insert(queue.begin(), link.begin(), link.end());
+		}
+		else
+			real=next;
+	}
+
+	return real;
+#endif
+}
+
 void unlink(const Path &path)
 {
 	if(::unlink(path.str().c_str())==-1)