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2019-01-16Merge #14268: Introduce SafeDbt to handle Dbt with free or memory_cleanse ↵Wladimir J. van der Laan
raii-style 4a86a0acd9ac3ca392f0584a5fd079a856e5e4ba Make SafeDbt DB_DBT_MALLOC on default initialization (Ben Woosley) 1a9f9f7e5e2e73fb832f5b96ad7e9e57954f3f3c Introduce SafeDbt to handle DB_DBT_MALLOC raii-style (Ben Woosley) 951a44e9cd6cf2b8058244f3f95181c5ba683fdd Drop unused setRange arg to BerkeleyBatch::ReadAtCursor (Ben Woosley) Pull request description: This provides additional exception-safety and case handling for the proper freeing of the associated buffers. Tree-SHA512: a038d728290cdb3905e7d881608052a6675b6425729ceaf7cfe69a6e91c2ee293cdb01e4b695a20963459ffdd9d4a1f9a08b3c07b1b5ba1aa8590a8149f686db
2019-01-13Replace remaining 0 with nullptr in Qt codeBen Woosley
Also used type-appropriate enum values such as Qt::NoItemFlags in some cases. All cases identified via -Wzero-as-null-pointer-constant
2018-12-04Merge #14760: Log env path in BerkeleyEnvironment::FlushWladimir J. van der Laan
467461030 Log env path in BerkeleyEnvironment::Flush (João Barbosa) Pull request description: With `bitcoind -regtest -wallet=w1 -wallet=w2 -debug`, before: ``` BerkeleyEnvironment::Flush: Flush(true) BerkeleyEnvironment::Flush: Flushing wallet.dat (refcount = 0)... BerkeleyEnvironment::Flush: wallet.dat checkpoint BerkeleyEnvironment::Flush: wallet.dat detach BerkeleyEnvironment::Flush: wallet.dat closed BerkeleyEnvironment::Flush: Flush(true) took 23ms BerkeleyEnvironment::Flush: Flush(true) BerkeleyEnvironment::Flush: Flushing wallet.dat (refcount = 0)... BerkeleyEnvironment::Flush: wallet.dat checkpoint BerkeleyEnvironment::Flush: wallet.dat detach BerkeleyEnvironment::Flush: wallet.dat closed BerkeleyEnvironment::Flush: Flush(true) took 19ms ``` After: ``` BerkeleyEnvironment::Flush: [/Users/joao/Library/Application Support/Bitcoin/regtest/wallets/w1] Flush(true) BerkeleyEnvironment::Flush: Flushing wallet.dat (refcount = 0)... BerkeleyEnvironment::Flush: wallet.dat checkpoint BerkeleyEnvironment::Flush: wallet.dat detach BerkeleyEnvironment::Flush: wallet.dat closed BerkeleyEnvironment::Flush: Flush(true) took 23ms BerkeleyEnvironment::Flush: [/Users/joao/Library/Application Support/Bitcoin/regtest/wallets/w2] Flush(true) BerkeleyEnvironment::Flush: Flushing wallet.dat (refcount = 0)... BerkeleyEnvironment::Flush: wallet.dat checkpoint BerkeleyEnvironment::Flush: wallet.dat detach BerkeleyEnvironment::Flush: wallet.dat closed BerkeleyEnvironment::Flush: Flush(true) took 19ms ``` Tree-SHA512: f90b413cca5d2527324a264ce371dc8baba69f5b541f7d7f6238a8dd79398cbd3c67c0d7a8a0b69aec6c44d77ba26a079c2241427e3669ed22c7da0e4d60039e
2018-11-24Make SafeDbt DB_DBT_MALLOC on default initializationBen Woosley
If we're constructing the SafeDbt without provided data, it is always malloced, so that is the case we expose. Also run clang-format.
2018-11-19Log env path in BerkeleyEnvironment::FlushJoão Barbosa
2018-11-12Introduce SafeDbt to handle DB_DBT_MALLOC raii-styleBen Woosley
This provides additional exception-safety and case handling for the proper freeing of the associated buffers.
2018-11-08wallet: Create IsDatabaseLoaded functionChun Kuan Lee
2018-11-06wallet: Add trailing wallet.dat when detecting duplicate wallet if it's a ↵Chun Kuan Lee
directory.
2018-11-06Refactor: Move m_db pointers into BerkeleyDatabaseRussell Yanofsky
This is a refactoring change that doesn't affect behavior. The motivation behind the change is give BerkeleyEnvironment objects access to BerkeleyDatabase objects so it will be possible to simplify the duplicate wallet check and more reliably avoid opening the same databases twice.
2018-11-04scripted-diff: Move util files to separate directory.Jim Posen
-BEGIN VERIFY SCRIPT- mkdir -p src/util git mv src/util.h src/util/system.h git mv src/util.cpp src/util/system.cpp git mv src/utilmemory.h src/util/memory.h git mv src/utilmoneystr.h src/util/moneystr.h git mv src/utilmoneystr.cpp src/util/moneystr.cpp git mv src/utilstrencodings.h src/util/strencodings.h git mv src/utilstrencodings.cpp src/util/strencodings.cpp git mv src/utiltime.h src/util/time.h git mv src/utiltime.cpp src/util/time.cpp sed -i 's/<util\.h>/<util\/system\.h>/g' $(git ls-files 'src/*.h' 'src/*.cpp') sed -i 's/<utilmemory\.h>/<util\/memory\.h>/g' $(git ls-files 'src/*.h' 'src/*.cpp') sed -i 's/<utilmoneystr\.h>/<util\/moneystr\.h>/g' $(git ls-files 'src/*.h' 'src/*.cpp') sed -i 's/<utilstrencodings\.h>/<util\/strencodings\.h>/g' $(git ls-files 'src/*.h' 'src/*.cpp') sed -i 's/<utiltime\.h>/<util\/time\.h>/g' $(git ls-files 'src/*.h' 'src/*.cpp') sed -i 's/BITCOIN_UTIL_H/BITCOIN_UTIL_SYSTEM_H/g' src/util/system.h sed -i 's/BITCOIN_UTILMEMORY_H/BITCOIN_UTIL_MEMORY_H/g' src/util/memory.h sed -i 's/BITCOIN_UTILMONEYSTR_H/BITCOIN_UTIL_MONEYSTR_H/g' src/util/moneystr.h sed -i 's/BITCOIN_UTILSTRENCODINGS_H/BITCOIN_UTIL_STRENCODINGS_H/g' src/util/strencodings.h sed -i 's/BITCOIN_UTILTIME_H/BITCOIN_UTIL_TIME_H/g' src/util/time.h sed -i 's/ util\.\(h\|cpp\)/ util\/system\.\1/g' src/Makefile.am sed -i 's/utilmemory\.\(h\|cpp\)/util\/memory\.\1/g' src/Makefile.am sed -i 's/utilmoneystr\.\(h\|cpp\)/util\/moneystr\.\1/g' src/Makefile.am sed -i 's/utilstrencodings\.\(h\|cpp\)/util\/strencodings\.\1/g' src/Makefile.am sed -i 's/utiltime\.\(h\|cpp\)/util\/time\.\1/g' src/Makefile.am sed -i 's/-> util ->/-> util\/system ->/' test/lint/lint-circular-dependencies.sh sed -i 's/src\/util\.cpp/src\/util\/system\.cpp/g' test/lint/lint-format-strings.py test/lint/lint-locale-dependence.sh sed -i 's/src\/utilmoneystr\.cpp/src\/util\/moneystr\.cpp/g' test/lint/lint-locale-dependence.sh sed -i 's/src\/utilstrencodings\.\(h\|cpp\)/src\/util\/strencodings\.\1/g' test/lint/lint-locale-dependence.sh sed -i 's/src\\utilstrencodings\.cpp/src\\util\\strencodings\.cpp/' build_msvc/libbitcoinconsensus/libbitcoinconsensus.vcxproj -END VERIFY SCRIPT-
2018-10-24wallet: Fix duplicate fileidChun Kuan Lee
2018-09-14Merge #12493: [wallet] Reopen CDBEnv after encryption instead of shutting downWladimir J. van der Laan
c1dde3a949b36ce9c2155777b3fa1372e7ed97d8 No longer shutdown after encrypting the wallet (Andrew Chow) d7637c5a3f1d62922594cdfb6272e30dacf60ce9 After encrypting the wallet, reload the database environment (Andrew Chow) 5d296ac810755dc47f105eb95b52b7e2bcb8aea8 Add function to close all Db's and reload the databae environment (Andrew Chow) a769461d5e37ddcb771ae836254fdc69177a28c4 Move BerkeleyEnvironment deletion from internal method to callsite (Andrew Chow) Pull request description: This is the replacement for #11678 which implements @ryanofsky's [suggestion](https://github.com/bitcoin/bitcoin/pull/11678#pullrequestreview-76464511). Shutting down the software was to prevent the BDB environment from writing unencrypted private keys to disk in the database log files, as was noted [here](https://bitcointalk.org/index.php?topic=51474.msg616068#msg616068). This PR replaces the shutdown behavior with a CDBEnv flush, close, and reopen which achieves the same effect: everything is cleanly flushed and closed, the log files are removed, and then the environment reopened to continue normal operation. To ensure that no unencrypted private keys are in the log files after encrypting the wallet, I wrote [this script](https://gist.github.com/achow101/7f7143e6c3d3fdc034d3470e72823e9d) to pull private keys from the original wallet file and searches for these keys in the log files (note that you will have to change your file paths to make it work on your own machine). As for concerns about private keys being written to slack space or being kept in memory, these behaviors no longer exist after the original wallet encryption PR and the shutting down solution from 2011. cc @ryanofsky Tree-SHA512: 34b894283b0677a873d06dee46dff8424dec85a2973009ac9b84bcf3d22d05f227c494168c395219d9aee3178e420cf70d4b3eeacc9785aa86b6015d25758e75
2018-09-11utils: Convert fs error messages from multibyte to utf-8Chun Kuan Lee
2018-09-05Merge #13954: Warn (don't fail!) on spelling errors. Fix typos reported by ↵MarcoFalke
codespell. f8a81f73ac lint: Add spell check linter (codespell) (practicalswift) ada356208e Fix typos reported by codespell (practicalswift) Pull request description: * Check for common misspellings using `codespell`. * Fix recently introduced typos reported by `codespell`. Tree-SHA512: 9974c0e640b411c7d0ebc5b45de253c19bac7fe3002cd98601ff8da8db584224c2fd7d331aee3df612c9f2cfef540d647a9b4c5a1a73fd208dc93ce4bf9e5e3e
2018-09-04Fix typos reported by codespellpracticalswift
2018-08-27Make objects in range declarations immutable by default. Avoid unnecessary ↵practicalswift
copying of objects in range declarations.
2018-08-09Add function to close all Db's and reload the databae environmentAndrew Chow
Adds a ReloadDbEnv function to BerkeleyEnvironment in order to close all Db instances, closes the environment, resets it, and then reopens the BerkeleyEnvironment. Also adds a ReloadDbEnv function to BerkeleyDatabase that calls BerkeleyEnvironment's ReloadDbEnv.
2018-08-09Move BerkeleyEnvironment deletion from internal method to callsiteAndrew Chow
Instead of having the object destroy itself, having the caller destroy it.
2018-08-08Merge #13780: 0.17: Pre-branch maintenanceWladimir J. van der Laan
3fc20632a3ad30809356a58d2cf0ea4a4ad4cec3 qt: Set BLOCK_CHAIN_SIZE = 220 (DrahtBot) 2b6a2f4a28792f2fe9dc1be843b1ff1ecae35e8a Regenerate manpages (DrahtBot) eb7daf4d600eeb631427c018a984a77a34aca66e Update copyright headers to 2018 (DrahtBot) Pull request description: Some trivial maintenance to avoid having to do it again after the 0.17 branch off. (The scripts to do this are in `./contrib/`) Tree-SHA512: 16b2af45e0351b1c691c5311d48025dc6828079e98c2aa2e600dc5910ee8aa01858ca6c356538150dc46fe14c8819ed8ec8e4ec9a0f682b9950dd41bc50518fa
2018-07-27Update copyright headers to 2018DrahtBot
2018-07-15wallet: Fix backupwallet for multiwalletsDaniel Kraft
backupwallet was broken for multiwallets in their own directories (i.e. something like DATADIR/wallets/mywallet/wallet.dat). In this case, the backup would use DATADIR/wallets/wallet.dat as source file and not take the specific wallet's directory into account. This led to either an error during the backup (if the wrong source file was not present) or would silently back up the wrong wallet; especially the latter behaviour can be quite bad for users.
2018-06-18bugfix: Remove dangling wallet env instanceJoão Barbosa
2018-05-14Merge #13127: wallet: Add Clang thread safety annotations for variables ↵MarcoFalke
guarded by cs_db 56921f9369 wallet: Add Clang thread safety annotations for variables guarded by cs_db (practicalswift) Pull request description: Add Clang thread safety annotations for variables guarded by `cs_db`. Tree-SHA512: d59723598e918143f36408b4f49d31138b5d8968ba191472f6a207a63af147627f21e48fd6cc1606dd901d8a58183271e65ea4346a380db3c09e404764a28063
2018-05-09wallet: Improve logging when BerkeleyDB environment fails to closeTim Ruffing
2018-05-03wallet: Reset BerkeleyDB handle after connection failsTim Ruffing
According to the BerkeleyDB docs, the DbEnv handle may not be accessed after close() has been called. This change ensures that we create a new handle after close() is called. This avoids a segfault when the first connection attempt fails and then a second connection attempt tries to call open() on the already closed DbEnv handle.
2018-04-30wallet: Add Clang thread safety annotations for variables guarded by cs_dbpracticalswift
2018-04-09Merge #11851: scripted-diff: Rename wallet database classesWladimir J. van der Laan
9b0f0c5 Add m_ prefix to WalletBatch::m_batch (Russell Yanofsky) 398c6f0 Update walletdb comment after renaming. (Russell Yanofsky) ea23945 scripted-diff: Rename wallet database classes (Russell Yanofsky) Pull request description: Scripted diff to rename some wallet classes. Motivated by discussion in https://github.com/bitcoin/bitcoin/pull/11687#discussion_r155354119 | Current | New | | ---------------- | ------------------- | | CDBEnv | BerkeleyEnvironment | | CDB | BerkeleyBatch | | CWalletDBWrapper | WalletDatabase | | CWalletDB | WalletBatch | Berkeley\* classes are intended to contain BDB specific code, while Wallet\* classes are intended to be more backend-agnostic. Also renamed associated variables: | Current | New | | ------------------- | --------------- | | dbw | database | | pwalletdb | batch | | pwalletdbEncryption | encrypted_batch | Tree-SHA512: 372f2e24b2deb59d4792b5ed578aaf0cce51b6db41c400bef5d0c2cd7833e62ae4d4afa0f6000268d52e15b20f737c5a55f1cecf7768556a782fd8cd6fe051d9
2018-04-09Remove duplicate includespracticalswift
2018-04-07scripted-diff: Rename wallet database classesRussell Yanofsky
-BEGIN VERIFY SCRIPT- sed -i 's/\<CWalletDBWrapper\>/BerkeleyDatabase/g' src/wallet/db.h src/wallet/db.cpp sed -i '/statuses/i/** Backend-agnostic database type. */\nusing WalletDatabase = BerkeleyDatabase\;\n' src/wallet/walletdb.h ren() { git grep -l "\<$1\>" 'src/*.cpp' 'src/*.h' ':(exclude)*dbwrapper*' test | xargs sed -i "s:\<$1\>:$2:g"; } ren CDBEnv BerkeleyEnvironment ren CDB BerkeleyBatch ren CWalletDBWrapper WalletDatabase ren CWalletDB WalletBatch ren dbw database ren m_dbw m_database ren walletdb batch ren pwalletdb batch ren pwalletdbIn batch_in ren wallet/batch.h wallet/walletdb.h ren pwalletdbEncryption encrypted_batch -END VERIFY SCRIPT-
2018-03-09scripted-diff: Convert 11 enums into scoped enums (C++11)practicalswift
-BEGIN VERIFY SCRIPT- sed -i 's/enum DBErrors/enum class DBErrors/g' src/wallet/walletdb.h git grep -l DB_ | xargs sed -i 's/DB_\(LOAD_OK\|CORRUPT\|NONCRITICAL_ERROR\|TOO_NEW\|LOAD_FAIL\|NEED_REWRITE\)/DBErrors::\1/g' sed -i 's/^ DBErrors::/ /g' src/wallet/walletdb.h sed -i 's/enum VerifyResult/enum class VerifyResult/g' src/wallet/db.h sed -i 's/\(VERIFY_OK\|RECOVER_OK\|RECOVER_FAIL\)/VerifyResult::\1/g' src/wallet/db.cpp sed -i 's/enum ThresholdState/enum class ThresholdState/g' src/versionbits.h git grep -l THRESHOLD_ | xargs sed -i 's/THRESHOLD_\(DEFINED\|STARTED\|LOCKED_IN\|ACTIVE\|FAILED\)/ThresholdState::\1/g' sed -i 's/^ ThresholdState::/ /g' src/versionbits.h sed -i 's/enum SigVersion/enum class SigVersion/g' src/script/interpreter.h git grep -l SIGVERSION_ | xargs sed -i 's/SIGVERSION_\(BASE\|WITNESS_V0\)/SigVersion::\1/g' sed -i 's/^ SigVersion::/ /g' src/script/interpreter.h sed -i 's/enum RetFormat {/enum class RetFormat {/g' src/rest.cpp sed -i 's/RF_\(UNDEF\|BINARY\|HEX\|JSON\)/RetFormat::\1/g' src/rest.cpp sed -i 's/^ RetFormat::/ /g' src/rest.cpp sed -i 's/enum HelpMessageMode {/enum class HelpMessageMode {/g' src/init.h git grep -l HMM_ | xargs sed -i 's/HMM_BITCOIN/HelpMessageMode::BITCOIN/g' sed -i 's/^ HelpMessageMode::/ /g' src/init.h sed -i 's/enum FeeEstimateHorizon/enum class FeeEstimateHorizon/g' src/policy/fees.h sed -i 's/enum RBFTransactionState/enum class RBFTransactionState/g' src/policy/rbf.h git grep -l RBF_ | xargs sed -i 's/RBF_TRANSACTIONSTATE_\(UNKNOWN\|REPLACEABLE_BIP125\|FINAL\)/RBFTransactionState::\1/g' sed -i 's/^ RBFTransactionState::/ /g' src/policy/rbf.h sed -i 's/enum BlockSource {/enum class BlockSource {/g' src/qt/clientmodel.h git grep -l BLOCK_SOURCE_ | xargs sed -i 's/BLOCK_SOURCE_\(NONE\|REINDEX\|DISK\|NETWORK\)/BlockSource::\1/g' sed -i 's/^ BlockSource::/ /g' src/qt/clientmodel.h sed -i 's/enum FlushStateMode {/enum class FlushStateMode {/g' src/validation.cpp sed -i 's/FLUSH_STATE_\(NONE\|IF_NEEDED\|PERIODIC\|ALWAYS\)/FlushStateMode::\1/g' src/validation.cpp sed -i 's/^ FlushStateMode::/ /g' src/validation.cpp sed -i 's/enum WitnessMode {/enum class WitnessMode {/g' src/test/script_tests.cpp sed -i 's/WITNESS_\(NONE\|PKH\|SH\)/WitnessMode::\1/g' src/test/script_tests.cpp sed -i 's/^ WitnessMode::/ /g' src/test/script_tests.cpp -END VERIFY SCRIPT-
2018-03-03Create new wallet databases as directories rather than filesRussell Yanofsky
This change should make it easier for users to make complete backups of wallets because they can now just back up the specified `-wallet=<path>` path directly, instead of having to back up the specified path as well as the transaction log directory (for incompletely flushed wallets). Another advantage of this change is that if two wallets are located in the same directory, they will now use their own BerkeleyDB environments instead using a shared environment. Using a shared environment makes it difficult to manage and back up wallets separately because transaction log files will contain a mix of data from all wallets in the environment.
2018-03-03Allow wallet files not in -walletdir directoryRussell Yanofsky
Remove restriction that -wallet filenames can only refer to files in the -walletdir directory.
2018-03-03Allow wallet files in multiple directoriesRussell Yanofsky
Remove requirement that two wallet files can only be opened at the same time if they are contained in the same directory. This change mostly consists of updates to function signatures (updating functions to take fs::path arguments, instead of combinations of strings, fs::path, and CDBEnv / CWalletDBWrapper arguments).
2018-01-16Abstract directory locking into util.cppMeshCollider
2018-01-16Make .walletlock distinct from .lockMeshCollider
2018-01-16Generalise walletdir lock error message for correctnessMeshCollider
2018-01-16Add a lock to the wallet directoryMeshCollider
2018-01-03Increment MIT Licence copyright header year on files modified in 2017Akira Takizawa
2017-12-12Merge #10574: Remove includes in .cpp files for things the corresponding .h ↵Wladimir J. van der Laan
file already included a720b92 Remove includes in .cpp files for things the corresponding .h file already included (practicalswift) Pull request description: Remove includes in .cpp files for things the corresponding .h file already included. Example case: * `addrdb.cpp` includes `addrdb.h` and `fs.h` * `addrdb.h` includes `fs.h` Then remove the direct inclusion of `fs.h` in `addrman.cpp` and rely on the indirect inclusion of `fs.h` via the included `addrdb.h`. In line with the header include guideline (see #10575). Tree-SHA512: 8704b9de3011a4c234db336a39f7d2c139e741cf0f7aef08a5d3e05197e1e18286b863fdab25ae9638af4ff86b3d52e5cab9eed66bfa2476063aa5c79f9b0346
2017-11-18Add -walletdir parameter to specify custom wallet dirMeshCollider
2017-11-16Remove includes in .cpp files for things the corresponding .h file already ↵practicalswift
included
2017-11-16scripted-diff: Replace #include "" with #include <> (ryanofsky)MeshCollider
-BEGIN VERIFY SCRIPT- for f in \ src/*.cpp \ src/*.h \ src/bench/*.cpp \ src/bench/*.h \ src/compat/*.cpp \ src/compat/*.h \ src/consensus/*.cpp \ src/consensus/*.h \ src/crypto/*.cpp \ src/crypto/*.h \ src/crypto/ctaes/*.h \ src/policy/*.cpp \ src/policy/*.h \ src/primitives/*.cpp \ src/primitives/*.h \ src/qt/*.cpp \ src/qt/*.h \ src/qt/test/*.cpp \ src/qt/test/*.h \ src/rpc/*.cpp \ src/rpc/*.h \ src/script/*.cpp \ src/script/*.h \ src/support/*.cpp \ src/support/*.h \ src/support/allocators/*.h \ src/test/*.cpp \ src/test/*.h \ src/wallet/*.cpp \ src/wallet/*.h \ src/wallet/test/*.cpp \ src/wallet/test/*.h \ src/zmq/*.cpp \ src/zmq/*.h do base=${f%/*}/ relbase=${base#src/} sed -i "s:#include \"\(.*\)\"\(.*\):if test -e \$base'\\1'; then echo \"#include <\"\$relbase\"\\1>\\2\"; else echo \"#include <\\1>\\2\"; fi:e" $f done -END VERIFY SCRIPT-
2017-11-09Use MakeUnique<Db>(...)practicalswift
2017-11-09Use MakeUnique<T>(...) instead of std::unique_ptr<T>(new T(...))practicalswift
2017-11-09Use unique_ptr for pdbCopy (Db) and fix potential memory leakpracticalswift
2017-11-09Use unique_ptr for dbenv (DbEnv)practicalswift
2017-11-01Merge #11376: Ensure backupwallet fails when attempting to backup to source fileMarcoFalke
5d465e396 Ensure backupwallet fails when attempting to backup to source file (Tomas van der Wansem) Pull request description: Previous behaviour was to destroy the wallet (to zero-length) This fixes #11375 Tree-SHA512: bfd1738659b15e3f23b6bbdf55ec12269c62c820bf701daec19500b52bd5845bb5516733c6f76f36197eb155182a8a35dc239ad4de2ef1e59bbb0f124a455759
2017-10-19Avoid opening copied wallet databases simultaneouslyRussell Yanofsky
Make sure wallet databases have unique fileids. If they don't, throw an error. BDB caches do not work properly when more than one open database has the same fileid, because values written to one database may show up in reads to other databases. Bitcoin will never create different databases with the same fileid, but users can create them by manually copying database files. BDB caching bug was reported by Chris Moore <dooglus@gmail.com> https://github.com/bitcoin/bitcoin/issues/11429 Fixes #11429
2017-10-14[wallet] Fix leak in CDB constructorJoão Barbosa
Now using a std::unique_ptr, the Db instance is correctly released when CDB initialization fails. The internal CDB state and mapFileUseCount are only mutated when the CDB initialization succeeds.
2017-10-10Ensure backupwallet fails when attempting to backup to source fileTomas van der Wansem
Previous behaviour was to destroy the wallet (to zero-length)