--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/progs/test2.c	Mon Oct 06 21:29:13 2014 +0100
@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// for installation notes see C0.c
+// this program can be called with
+//
+//  ./args2-good | ./C2
+//
+// or
+//
+// ./args2-bad | ./C2
+
+
+int match(char *s1, char *s2) {
+  while( *s1 != '\0' && *s2 != 0 && *s1 == *s2 ){
+    s1++; s2++;
+  }
+  return( *s1 - *s2 );
+}
+
+// since gets() is insecure and produces lots of warnings, 
+// I use my own input function instead ;o)
+char ch;
+int i;
+
+void get_line(char *dst) {
+  char buffer[8];
+  i = 0;
+  while ((ch = getchar()) != '\n') {
+    buffer[i++] = ch; 
+  }
+  buffer[i] = '\0';
+  strcpy(dst, buffer);
+}
+
+void welcome() { printf("Welcome to the Machine!\n"); exit(0); }
+void goodbye() { printf("Invalid identity, exiting!\n"); exit(1); }
+
+main(){
+  char name[8];
+  char pw[8]; 
+
+  printf("login: "); 
+  get_line(name);
+  printf("password: "); 
+  get_line(pw);
+
+  if(match(name, pw) == 0)
+    welcome();
+  else
+    goodbye();
+}
+