diff options
| -rw-r--r-- | packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol | 35 |
1 files changed, 32 insertions, 3 deletions
diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol b/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol index 758b7ec90..3e70d1b60 100644 --- a/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol +++ b/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol @@ -29,7 +29,7 @@ contract LibMath is /// @param numerator Numerator. /// @param denominator Denominator. /// @param target Value to calculate partial of. - /// @return Partial value of target. + /// @return Partial value of target rounded down. function getPartialAmount( uint256 numerator, uint256 denominator, @@ -45,8 +45,37 @@ contract LibMath is ); return partialAmount; } - - /// @dev Checks if rounding error >= 0.1%. + + /// @dev Calculates partial value given a numerator and denominator. + /// @param numerator Numerator. + /// @param denominator Denominator. + /// @param target Value to calculate partial of. + /// @return Partial value of target rounded up. + function getPartialAmountCeil( + uint256 numerator, + uint256 denominator, + uint256 target + ) + internal + pure + returns (uint256 partialAmount) + { + require( + denominator > 0, + "DIVISION_BY_ZERO" + ); + + // SafeDiv rounds down. To use it to round up we need to add + // denominator - 1. This causes anything less than an exact multiple + // of denominator to be rounded up. + partialAmount = safeDiv( + safeAdd(safeMul(numerator, target), safeSub(denominator, 1)), + denominator + ); + return partialAmount; + } + + /// @dev Checks if rounding error > 0.1%. /// @param numerator Numerator. /// @param denominator Denominator. /// @param target Value to multiply with numerator/denominator. |