syscalls: implement getcwd syscall

src/tasking/syscalls.c

@@ -416,8 +416,56 @@ int sys_chdir(TrapFrame *tf)
     return -1;
 }
 
-int sys_getcwd(TrapFrame *tf)
+#include "../include/vfs.h"
+/**
+ * I'm very sorry before myself for this but these directory traversing things are so hard, follow_path in vfs was pretty okay,
+ * this is when shit got real though
+ */
+uint32_t sys_getcwd(TrapFrame *tf)
 {
+    l9660_dir current_dir = *(current->cwd);
+
+    char path_reversed[256] = {0};
+    char component_name[64];
+
+    while (!is_root_dir(&current_dir)) {
+        uint32_t child_sector = current_dir.file.first_sector;
+        
+        // Open the parent directory
+        l9660_dir parent_dir;
+        l9660_opendirat(&parent_dir, &current_dir, "..");
+
+        // Find our previous directory's name within the parent
+        find_name_for_sector(component_name, sizeof(component_name), &parent_dir, child_sector);
+
+        // Prepend the name to our reversed path string (e.g., "dash/" + "katau/" -> "katau/dash/")
+        strcat(path_reversed, component_name);
+        strcat(path_reversed, "/");
+
+        // Move up one level
+        current_dir = parent_dir;
+    }
+
+    // Now, reverse the string "dash/katau/" to create the final path "/katau/dash"
+    char final_path[256] = "/";
+    char* token = strtok(path_reversed, "/");
+    while (token != NULL) {
+        // A bit of a trick to prepend tokens
+        char temp[256];
+        strcpy(temp, "/");
+        strcat(temp, token);
+        strcat(temp, final_path);
+        strcpy(final_path, temp);
+        
+        token = strtok(NULL, "/");
+    }
+    // Handle the root case where the loop doesn't run
+    if (strlen(final_path) > 1) {
+        final_path[strlen(final_path) - 1] = '\0'; // Remove trailing slash
+    }
+
+    strcpy((char*)tf->ebx, final_path);
+
     //strcpy((char*)tf->ebx, current->cwd->fat->path);
     
     return tf->ebx;
@@ -489,6 +537,8 @@ void handle_syscall(TrapFrame *tf)
     debug_log("EDX: %X\n", tf->edx);
     */
 
+    debug_log("calling 0x%X\n", tf->eax);
+
     switch(tf->eax)
     {
         case 1://exit
@@ -544,7 +594,7 @@ void handle_syscall(TrapFrame *tf)
 
         default:
             debug_log("unknown syscall: %X\n", tf->eax);
-            tf->eax = -1;
+            tf->eax = -38;//-ENOSYS
             break;
     }
 }