1 files changed, 134 insertions, 0 deletions
diff --git a/kernel/src/generic/vfs.cpp b/kernel/src/generic/vfs.cpp
index d34ae0c..75c3ed8 100644
--- a/kernel/src/generic/vfs.cpp
+++ b/kernel/src/generic/vfs.cpp
@@ -1,6 +1,140 @@
 #include <cstdint>
 #include <generic/vfs.hpp>
 #include <drivers/disk.hpp>
+#include <klibc/string.hpp>
+#include <utils/errno.hpp>
+#include <klibc/stdio.hpp>
+#include <generic/lock/mutex.hpp>
+
+// /bin/path -> /usr/bin/path
+void __vfs_symlink_resolve_no_at_symlink_follow(char* path, char* out) {
+    char *next = nullptr;
+    char buffer[4096];
+
+    int e = vfs::readlink(path,buffer,4096);
+
+    if(e == ENOSYS) 
+        klibc::memcpy(out,path,klibc::strlen(path) + 1);
+
+    if(e == EINVAL)
+        klibc::memcpy(out,path,klibc::strlen(path) + 1);
+    else if(e == 0) {
+        
+        klibc::memcpy(out,path,klibc::strlen(path) + 1);
+    } else if(e == ENOENT) {
+        klibc::memcpy(out,path,klibc::strlen(path) + 1);
+        // maybe it wants directory symlink ?
+        char path0[4096];
+        klibc::memcpy(path0,path,klibc::strlen(path) + 1);
+
+        char result[4096];
+
+        int c = 0;
+
+        char* token = klibc::strtok(&next, path0, "/");
+        
+        /* Start building path from null and trying to find symlink */
+        while(token) {
+            
+            result[c] = '/';
+            c++;
+
+            std::uint64_t mm = 0;
+            mm = klibc::strlen(token);
+            klibc::memcpy((char*)((std::uint64_t)result + c),token,mm);
+            c += mm;
+            result[c] = '\0';
+
+            e = vfs::readlink(result,buffer,4096);
+            if(e == 0) {
+                char buffer2[4096];
+                vfs::resolve_path(buffer,result,buffer2,0);
+                c = klibc::strlen(buffer2);
+                buffer2[c++] = '/';
+                klibc::memcpy(buffer2 + c, path + klibc::strlen(result) + 1, klibc::strlen(path) - klibc::strlen(result));
+                __vfs_symlink_resolve_no_at_symlink_follow(buffer2,out);
+                return;
+            } else if(e == ENOENT) {
+                klibc::memcpy(out,path,klibc::strlen(path) + 1);
+            }
+
+            token = klibc::strtok(&next,0,"/");
+        }
+        klibc::memcpy(out,path,klibc::strlen(path) + 1);
+    }
+}
+
+void __vfs_symlink_resolve(char* path, char* out, int level) {
+
+    char *next = nullptr;
+
+    char buffer[4096];
+
+    if(level == 25) {
+        // hell no :skull:
+        klibc::memcpy(out,path,klibc::strlen(path) + 1);
+        return;
+    }
+
+    int e = vfs::readlink(path,buffer,4096);
+
+    if(e == ENOSYS) 
+        klibc::memcpy(out,path,klibc::strlen(path) + 1);
+
+    if(e == EINVAL)
+        klibc::memcpy(out,path,klibc::strlen(path) + 1);
+    else if(e == 0) {
+        
+        char result[4096];
+        vfs::resolve_path(buffer,path,result,0);
+        __vfs_symlink_resolve(result,out, level + 1);
+    } else if(e == ENOENT) {
+        klibc::memcpy(out,path,klibc::strlen(path) + 1);
+        // maybe it wants directory symlink ?
+        char path0[4096];
+        klibc::memcpy(path0,path,klibc::strlen(path) + 1);
+
+        char result[4096];
+
+        int c = 0;
+
+        char* token = klibc::strtok(&next, path0, "/");
+        
+        /* Start building path from null and trying to find symlink */
+        while(token) {
+            
+            result[c] = '/';
+            c++;
+
+            std::uint64_t mm = 0;
+            mm = klibc::strlen(token);
+           klibc:: memcpy((char*)((std::uint64_t)result + c),token,mm);
+            c += mm;
+            result[c] = '\0';
+
+            e = vfs::readlink(result,buffer,4096);
+            if(e == 0) {
+                char buffer2[4096];
+                vfs::resolve_path(buffer,result,buffer2,0);
+                c = klibc::strlen(buffer2);
+                buffer2[c++] = '/';
+                klibc::memcpy(buffer2 + c, path + klibc::strlen(result) + 1, klibc::strlen(path) - klibc::strlen(result));
+                __vfs_symlink_resolve(buffer2,out, level + 1);
+                return;
+            } else if(e == ENOENT) {
+                klibc::memcpy(out,path,klibc::strlen(path) + 1);
+                return;
+            } else {
+                klibc::memcpy(out,path,klibc::strlen(path) + 1);
+                return;
+            }
+
+            token = klibc::strtok(&next,0,"/");
+        }
+        klibc::memcpy(out,path,klibc::strlen(path) + 1);
+    }
+}
+
 
 void vfs::init() {