--- stack/stack.c	2002/02/07 23:53:14	1.51
+++ stack/stack.c	2002/02/07 23:56:54	1.53
@@ -1,14 +1,12 @@
-/* printf */
+/* printf, sscanf, fgets, fprintf */
 #include <stdio.h>
-/* EXIT_SUCCESS */
+/* exit, EXIT_SUCCESS, malloc, free */
 #include <stdlib.h>
 /* NULL */
 #include <stddef.h>
 /* dlopen, dlsym, dlerror */
 #include <dlfcn.h>
-/* assert */
-#include <assert.h>
-/* strcat */
+/* strcmp, strcpy, strlen, strcat, strdup */
 #include <string.h>
 
 #define HASHTBLSIZE 65536
@@ -207,8 +205,8 @@
   strcpy(new_string, "sx_");	/* Stack eXternal */
   current=new_string+3;
   while(old_string[0] != '\0'){
-    current[0]=validchars[old_string[0]/16];
-    current[1]=validchars[old_string[0]%16];
+    current[0]=validchars[(unsigned char)(old_string[0])/16];
+    current[1]=validchars[(unsigned char)(old_string[0])%16];
     current+=2;
     old_string++;
   }