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Use stint in wrc20 challenge

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This commit is contained in:
Yuriy Glukhov 2018-08-10 18:12:18 +03:00
parent 7fb5a95ac4
commit 44aad38464
2 changed files with 11 additions and 5 deletions
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2
eth_contracts.nimble
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@ -6,7 +6,7 @@ skipDirs = @["examples"]
# Dependencies # Dependencies
requires "nim >= 0.18.1" requires "nim >= 0.18.1", "stint"
proc buildExample(name: string) = proc buildExample(name: string) =
exec "nim c --out:examples/" & name & ".wasm examples/" & name exec "nim c --out:examples/" & name & ".wasm examples/" & name

14
examples/test.nim
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@ -1,7 +1,7 @@
## ewasm “WRC20” token contract coding challenge ## ewasm “WRC20” token contract coding challenge
## https://gist.github.com/axic/16158c5c88fbc7b1d09dfa8c658bc363 ## https://gist.github.com/axic/16158c5c88fbc7b1d09dfa8c658bc363
import ../eth_contracts import ../eth_contracts, stint
proc do_balance() = proc do_balance() =
if getCallDataSize() != 24: if getCallDataSize() != 24:
@ -30,15 +30,21 @@ proc do_transfer() =
var recipientBalance: array[32, byte] var recipientBalance: array[32, byte]
storageLoad(recipient, addr recipientBalance) storageLoad(recipient, addr recipientBalance)
var sb = readUintBE[256](senderBalance)
var rb = readUintBE[256](recipientBalance)
let v = value.u256
block: block:
# This is a quick stub to avoid using stint for now. Works only with # This is a quick stub to avoid using stint for now. Works only with
# single byte values. # single byte values.
if sender_balance[31].uint64 < value: if sb < v:
revert(nil, 0) revert(nil, 0)
sender_balance[31] -= value.byte sb -= v
recipient_balance[31] += value.byte rb += v
senderBalance = sb.toByteArrayBE()
recipientBalance = rb.toByteArrayBE()
storageStore(sender, addr senderBalance) storageStore(sender, addr senderBalance)
storageStore(recipient, addr recipientBalance) storageStore(recipient, addr recipientBalance)