replace-math.js - mozsearch

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/*

 * Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/licenses/publicdomain/

*/

var BUGNUMBER = 805121;

var summary = "Be more careful with string math to avoid wrong results";

print(BUGNUMBER + ": " + summary);

/******************************************************************************/

function puff(x, n)

  while(x.length < n)

    x += x;

  return x.substring(0, n);

var x = puff("1", 1 << 20);

var rep = puff("$1", 1 << 16);

try

  var y = x.replace(/(.+)/g, rep);

  assertEq(y.length, Math.pow(2, 36));

catch (e)

  // OOM also acceptable

/******************************************************************************/

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("Tests complete");