use Math.random() in rand(). This gives properly random results, unlike before, but we now ignore the seed sadly

1 files changed, 6 insertions, 19 deletions

diff --git a/src/library.js b/src/library.js
index cfa29c58..dda3e0a5 100644
--- a/src/library.js
+++ b/src/library.js
@@ -3907,26 +3907,13 @@ LibraryManager.library = {
     return limit;
   },
 
-  // A glibc-like implementation of the C random number generation functions:
-  //   http://pubs.opengroup.org/onlinepubs/000095399/functions/rand.html
-  __rand_state: 42,
-  srand__deps: ['__rand_state'],
-  srand: function(seed) {
-    // void srand(unsigned seed);
-    ___rand_state = seed;
-  },
-  rand__deps: ['__rand_state'],
+  // Use browser's Math.random(). We can't set a seed, though.
+  srand: function(seed) {}, // XXX ignored
   rand: function() {
-    // int rand(void);
-    ___rand_state = (1103515245 * ___rand_state + 12345) % 0x100000000;
-    return ___rand_state & 0x7FFFFFFF;
-  },
-  rand_r: function(seed) {
-    // int rand_r(unsigned *seed);
-    var state = {{{ makeGetValue('seed', 0, 'i32') }}};
-    state = (1103515245 * state + 12345) % 0x100000000;
-    {{{ makeSetValue('seed', 0, 'state', 'i32') }}}
-    return state & 0x7FFFFFFF;
+    return Math.floor(Math.random()*0x80000000);
+  },
+  rand_r: function(seed) { // XXX ignores the seed
+    return Math.floor(Math.random()*0x80000000);
   },
 
   realpath__deps: ['$FS', '__setErrNo'],