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Fix applyOffer() calculations and doc.

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This commit is contained in:
Arthur Britto
2013-01-28 12:40:01 -08:00
parent d31d83c125
commit 02b9a0b623
1 changed files with 9 additions and 4 deletions
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13
src/cpp/ripple/Amount.cpp
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@@ -1023,7 +1023,7 @@ STAmount STAmount::setRate(uint64 rate)
// --> uOfferPaysRate: >= QUALITY_ONE | TransferRate for third party IOUs paid by offer owner.
// --> saOfferRate: Original saOfferGets/saOfferPays, when offer was made.
// --> saOfferFunds: Limit for saOfferPays : How much can pay including fees.
// --> saTakerFunds: Limit for saOfferGets : How much taker really wants. : Driver
// --> saTakerFunds: Limit for saOfferGets : How much can pay including fees.
// --> saOfferPays: Request : this should be reduced as the offer is fullfilled.
// --> saOfferGets: Request : this should be reduced as the offer is fullfilled.
// --> saTakerPays: Limit for taker to Pays.
@@ -1050,7 +1050,7 @@ bool STAmount::applyOffer(
// Limit offerer funds available, by transfer fees.
STAmount saOfferFundsAvailable = QUALITY_ONE == uOfferPaysRate
? saOfferFunds
: STAmount::divide(saOfferFunds, STAmount(CURRENCY_ONE, uOfferPaysRate, -9));
: STAmount::divide(saOfferFunds, STAmount(CURRENCY_ONE, ACCOUNT_ONE, uOfferPaysRate, -9));
cLog(lsINFO) << "applyOffer: uOfferPaysRate=" << uOfferPaysRate;
cLog(lsINFO) << "applyOffer: saOfferFundsAvailable=" << saOfferFundsAvailable.getFullText();
@@ -1058,8 +1058,9 @@ bool STAmount::applyOffer(
// Limit taker funds available, by transfer fees.
STAmount saTakerFundsAvailable = QUALITY_ONE == uTakerPaysRate
? saTakerFunds
: STAmount::divide(saTakerFunds, STAmount(CURRENCY_ONE, uTakerPaysRate, -9));
: STAmount::divide(saTakerFunds, STAmount(CURRENCY_ONE, ACCOUNT_ONE, uTakerPaysRate, -9));
cLog(lsINFO) << "applyOffer: TAKER_FEES=" << STAmount(CURRENCY_ONE, ACCOUNT_ONE, uTakerPaysRate, -9).getFullText();
cLog(lsINFO) << "applyOffer: uTakerPaysRate=" << uTakerPaysRate;
cLog(lsINFO) << "applyOffer: saTakerFundsAvailable=" << saTakerFundsAvailable.getFullText();
@@ -1085,10 +1086,14 @@ bool STAmount::applyOffer(
cLog(lsINFO) << "applyOffer: saOfferGetsAvailable=" << saOfferGetsAvailable.getFullText();
STAmount saTakerPaysAvailable = std::min(saTakerPays, saTakerFundsAvailable);
cLog(lsINFO) << "applyOffer: saTakerPaysAvailable=" << saTakerPaysAvailable.getFullText();
STAmount saTakerPaysMax = std::min(saTakerPaysAvailable, saOfferGetsAvailable);
cLog(lsINFO) << "applyOffer: saTakerPaysMax=" << saTakerPaysMax.getFullText();
STAmount saTakerGetsMax = saTakerPaysMax >= saOfferGetsAvailable
? saOfferPaysAvailable // Potentially take entire offer. Avoid math shenanigans.
: std::min(saOfferPaysAvailable, multiply(saTakerPaysMax, saOfferRate, saTakerGets)); // Taker a portion of offer.
: std::min(saOfferPaysAvailable, divide(saTakerPaysMax, saOfferRate, saTakerGets)); // Taker a portion of offer.
cLog(lsINFO) << "applyOffer: saOfferRate=" << saOfferRate.getFullText();
cLog(lsINFO) << "applyOffer: saTakerGetsMax=" << saTakerGetsMax.getFullText();
saTakerGot = std::min(saTakerGets, saTakerGetsMax); // Limit by wanted.
saTakerPaid = saTakerGot == saOfferPaysAvailable