syscalls: fix handle_syscall function performing more that 1 syscall at a time

src/tasking/syscalls.c

@@ -239,38 +239,32 @@ void handle_syscall(TrapFrame *tf)
     debug_log("EDX: %X\n", tf->edx);
     */
 
-    if(tf->eax == 1)//exit
+    switch(tf->eax)
     {
-        int r = sys_exit(tf);
+        case 1://exit
-        tf->eax = r;
+            tf->eax = sys_exit(tf);
-    }
+            break;
 
-    if(tf->eax == 2)//fork
+        case 2://fork
-    {
+            tf->eax = sys_fork(tf);
-        int r = sys_fork(tf);
+            break;
-        debug_log("RRRRRRRR = %X\n", r);
-        tf->eax = r;
-    }
     
-    if(tf->eax == 3)//read
+        case 3://read
-    {
+            tf->eax = sys_read(tf);
-        int r = sys_read(tf);
+            break;
-        tf->eax = r;
-    }
 
-    if(tf->eax == 4)//write
+        case 4://write
-    {
+            tf->eax = sys_write(tf);
-        int r = sys_write(tf);
+            break;
-        tf->eax = r;
+        case 5://open
-    }
+            tf->eax = sys_open(tf);
-    if(tf->eax == 5)//open
+            break;
-    {
+        case 6://close
-        int r = sys_open(tf);
+            tf->eax = sys_close(tf);
-        tf->eax = r;
+            break;
-    }
+        default:
-    if(tf->eax == 6)//close
+            debug_log("unknown syscall: %X\n", tf->eax);
-    {
+            tf->eax = -1;
-        int r = sys_close(tf);
+            break;
-        tf->eax = r;
     }
 }