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Diffstat (limited to 'apt-pkg/contrib/error.cc')
| -rw-r--r-- | apt-pkg/contrib/error.cc | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/apt-pkg/contrib/error.cc b/apt-pkg/contrib/error.cc new file mode 100644 index 000000000..c06ea8364 --- /dev/null +++ b/apt-pkg/contrib/error.cc @@ -0,0 +1,265 @@ +// -*- mode: cpp; mode: fold -*- +// Description /*{{{*/ +/* ###################################################################### + + Global Error Class - Global error mechanism + + We use a simple STL vector to store each error record. A PendingFlag + is kept which indicates when the vector contains a Sever error. + + This source is placed in the Public Domain, do with it what you will + It was originally written by Jason Gunthorpe. + + ##################################################################### */ + /*}}}*/ +// Include Files /*{{{*/ +#include <config.h> + +#include <apt-pkg/error.h> + +#include <stdarg.h> +#include <stddef.h> +#include <list> +#include <iostream> +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string> +#include <cstring> +#include <algorithm> + + /*}}}*/ + +// Global Error Object /*{{{*/ +/* If the implementation supports posix threads then the accessor function + is compiled to be thread safe otherwise a non-safe version is used. A + Per-Thread error object is maintained in much the same manner as libc + manages errno */ +#if defined(_POSIX_THREADS) && defined(HAVE_PTHREAD) + #include <pthread.h> + + static pthread_key_t ErrorKey; + static void ErrorDestroy(void *Obj) {delete (GlobalError *)Obj;}; + static void KeyAlloc() {pthread_key_create(&ErrorKey,ErrorDestroy);}; + + GlobalError *_GetErrorObj() { + static pthread_once_t Once = PTHREAD_ONCE_INIT; + pthread_once(&Once,KeyAlloc); + + void *Res = pthread_getspecific(ErrorKey); + if (Res == 0) + pthread_setspecific(ErrorKey,Res = new GlobalError); + return (GlobalError *)Res; + } +#else + GlobalError *_GetErrorObj() { + static GlobalError *Obj = new GlobalError; + return Obj; + } +#endif + /*}}}*/ +// GlobalError::GlobalError - Constructor /*{{{*/ +GlobalError::GlobalError() : PendingFlag(false) {} + /*}}}*/ +// GlobalError::FatalE, Errno, WarningE, NoticeE and DebugE - Add to the list/*{{{*/ +#define GEMessage(NAME, TYPE) \ +bool GlobalError::NAME (const char *Function, const char *Description,...) { \ + va_list args; \ + size_t msgSize = 400; \ + int const errsv = errno; \ + bool retry; \ + do { \ + va_start(args,Description); \ + retry = InsertErrno(TYPE, Function, Description, args, errsv, msgSize); \ + va_end(args); \ + } while (retry); \ + return false; \ +} +GEMessage(FatalE, FATAL) +GEMessage(Errno, ERROR) +GEMessage(WarningE, WARNING) +GEMessage(NoticeE, NOTICE) +GEMessage(DebugE, DEBUG) +#undef GEMessage + /*}}}*/ +// GlobalError::InsertErrno - Get part of the errortype string from errno/*{{{*/ +bool GlobalError::InsertErrno(MsgType const &type, const char *Function, + const char *Description,...) { + va_list args; + size_t msgSize = 400; + int const errsv = errno; + bool retry; + do { + va_start(args,Description); + retry = InsertErrno(type, Function, Description, args, errsv, msgSize); + va_end(args); + } while (retry); + return false; +} + /*}}}*/ +// GlobalError::InsertErrno - formats an error message with the errno /*{{{*/ +bool GlobalError::InsertErrno(MsgType type, const char* Function, + const char* Description, va_list &args, + int const errsv, size_t &msgSize) { + char* S = (char*) malloc(msgSize); + int const n = snprintf(S, msgSize, "%s - %s (%i: %s)", Description, + Function, errsv, strerror(errsv)); + if (n > -1 && ((unsigned int) n) < msgSize); + else { + if (n > -1) + msgSize = n + 1; + else + msgSize *= 2; + free(S); + return true; + } + + bool const geins = Insert(type, S, args, msgSize); + free(S); + return geins; +} + /*}}}*/ +// GlobalError::Fatal, Error, Warning, Notice and Debug - Add to the list/*{{{*/ +#define GEMessage(NAME, TYPE) \ +bool GlobalError::NAME (const char *Description,...) { \ + va_list args; \ + size_t msgSize = 400; \ + bool retry; \ + do { \ + va_start(args,Description); \ + retry = Insert(TYPE, Description, args, msgSize); \ + va_end(args); \ + } while (retry); \ + return false; \ +} +GEMessage(Fatal, FATAL) +GEMessage(Error, ERROR) +GEMessage(Warning, WARNING) +GEMessage(Notice, NOTICE) +GEMessage(Debug, DEBUG) +#undef GEMessage + /*}}}*/ +// GlobalError::Insert - Add a errotype message to the list /*{{{*/ +bool GlobalError::Insert(MsgType const &type, const char *Description,...) +{ + va_list args; + size_t msgSize = 400; + bool retry; + do { + va_start(args,Description); + retry = Insert(type, Description, args, msgSize); + va_end(args); + } while (retry); + return false; +} + /*}}}*/ +// GlobalError::Insert - Insert a new item at the end /*{{{*/ +bool GlobalError::Insert(MsgType type, const char* Description, + va_list &args, size_t &msgSize) { + char* S = (char*) malloc(msgSize); + int const n = vsnprintf(S, msgSize, Description, args); + if (n > -1 && ((unsigned int) n) < msgSize); + else { + if (n > -1) + msgSize = n + 1; + else + msgSize *= 2; + free(S); + return true; + } + + Item const m(S, type); + Messages.push_back(m); + + if (type == ERROR || type == FATAL) + PendingFlag = true; + + if (type == FATAL || type == DEBUG) + std::clog << m << std::endl; + + free(S); + return false; +} + /*}}}*/ +// GlobalError::PopMessage - Pulls a single message out /*{{{*/ +bool GlobalError::PopMessage(std::string &Text) { + if (Messages.empty() == true) + return false; + + Item const msg = Messages.front(); + Messages.pop_front(); + + bool const Ret = (msg.Type == ERROR || msg.Type == FATAL); + Text = msg.Text; + if (PendingFlag == false || Ret == false) + return Ret; + + // check if another error message is pending + for (std::list<Item>::const_iterator m = Messages.begin(); + m != Messages.end(); ++m) + if (m->Type == ERROR || m->Type == FATAL) + return Ret; + + PendingFlag = false; + return Ret; +} + /*}}}*/ +// GlobalError::DumpErrors - Dump all of the errors/warns to cerr /*{{{*/ +void GlobalError::DumpErrors(std::ostream &out, MsgType const &threshold, + bool const &mergeStack) { + if (mergeStack == true) + for (std::list<MsgStack>::const_reverse_iterator s = Stacks.rbegin(); + s != Stacks.rend(); ++s) + std::copy(s->Messages.begin(), s->Messages.end(), std::front_inserter(Messages)); + + std::for_each(Messages.begin(), Messages.end(), [&threshold, &out](Item const &m) { + if (m.Type >= threshold) + out << m << std::endl; + }); + + Discard(); +} + /*}}}*/ +// GlobalError::Discard - Discard /*{{{*/ +void GlobalError::Discard() { + Messages.clear(); + PendingFlag = false; +} + /*}}}*/ +// GlobalError::empty - does our error list include anything? /*{{{*/ +bool GlobalError::empty(MsgType const &threshold) const { + if (PendingFlag == true) + return false; + + if (Messages.empty() == true) + return true; + + return std::find_if(Messages.begin(), Messages.end(), [&threshold](Item const &m) { + return m.Type >= threshold; + }) == Messages.end(); +} + /*}}}*/ +// GlobalError::PushToStack /*{{{*/ +void GlobalError::PushToStack() { + Stacks.emplace_back(Messages, PendingFlag); + Discard(); +} + /*}}}*/ +// GlobalError::RevertToStack /*{{{*/ +void GlobalError::RevertToStack() { + Discard(); + MsgStack pack = Stacks.back(); + Messages = pack.Messages; + PendingFlag = pack.PendingFlag; + Stacks.pop_back(); +} + /*}}}*/ +// GlobalError::MergeWithStack /*{{{*/ +void GlobalError::MergeWithStack() { + MsgStack pack = Stacks.back(); + Messages.splice(Messages.begin(), pack.Messages); + PendingFlag = PendingFlag || pack.PendingFlag; + Stacks.pop_back(); +} + /*}}}*/ |