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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: error.cc,v 1.6 1999/01/18 06:20:07 jgg Exp $
/* ######################################################################
Global Erorr 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 /*{{{*/
#ifdef __GNUG__
#pragma implementation "apt-pkg/error.h"
#endif
#include <apt-pkg/error.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
/*}}}*/
// 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 _POSIX_THREADS == 1
#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() : List(0), PendingFlag(false)
{
}
/*}}}*/
// GlobalError::Errno - Get part of the error string from errno /*{{{*/
// ---------------------------------------------------------------------
/* Function indicates the stdlib function that failed and Description is
a user string that leads the text. Form is:
Description - Function (errno: strerror)
Carefull of the buffer overrun, sprintf.
*/
bool GlobalError::Errno(const char *Function,const char *Description,...)
{
va_list args;
va_start(args,Description);
// sprintf the description
char S[400];
vsnprintf(S,sizeof(S),Description,args);
snprintf(S + strlen(S),sizeof(S) - strlen(S),
" - %s (%i %s)",Function,errno,strerror(errno));
// Put it on the list
Item *Itm = new Item;
Itm->Text = S;
Itm->Error = true;
Insert(Itm);
PendingFlag = true;
return false;
}
/*}}}*/
// GlobalError::WarningE - Get part of the warn string from errno /*{{{*/
// ---------------------------------------------------------------------
/* Function indicates the stdlib function that failed and Description is
a user string that leads the text. Form is:
Description - Function (errno: strerror)
Carefull of the buffer overrun, sprintf.
*/
bool GlobalError::WarningE(const char *Function,const char *Description,...)
{
va_list args;
va_start(args,Description);
// sprintf the description
char S[400];
vsnprintf(S,sizeof(S),Description,args);
snprintf(S + strlen(S),sizeof(S) - strlen(S)," - %s (%i %s)",Function,errno,strerror(errno));
// Put it on the list
Item *Itm = new Item;
Itm->Text = S;
Itm->Error = false;
Insert(Itm);
return false;
}
/*}}}*/
// GlobalError::Error - Add an error to the list /*{{{*/
// ---------------------------------------------------------------------
/* Just vsprintfs and pushes */
bool GlobalError::Error(const char *Description,...)
{
va_list args;
va_start(args,Description);
// sprintf the description
char S[400];
vsnprintf(S,sizeof(S),Description,args);
// Put it on the list
Item *Itm = new Item;
Itm->Text = S;
Itm->Error = true;
Insert(Itm);
PendingFlag = true;
return false;
}
/*}}}*/
// GlobalError::Warning - Add a warning to the list /*{{{*/
// ---------------------------------------------------------------------
/* This doesn't set the pending error flag */
bool GlobalError::Warning(const char *Description,...)
{
va_list args;
va_start(args,Description);
// sprintf the description
char S[400];
vsnprintf(S,sizeof(S),Description,args);
// Put it on the list
Item *Itm = new Item;
Itm->Text = S;
Itm->Error = false;
Insert(Itm);
return false;
}
/*}}}*/
// GlobalError::PopMessage - Pulls a single message out /*{{{*/
// ---------------------------------------------------------------------
/* This should be used in a loop checking empty() each cycle. It returns
true if the message is an error. */
bool GlobalError::PopMessage(string &Text)
{
if (List == 0)
return false;
bool Ret = List->Error;
Text = List->Text;
Item *Old = List;
List = List->Next;
delete Old;
// This really should check the list to see if only warnings are left..
if (List == 0)
PendingFlag = false;
return Ret;
}
/*}}}*/
// GlobalError::DumpErrors - Dump all of the errors/warns to cerr /*{{{*/
// ---------------------------------------------------------------------
/* */
void GlobalError::DumpErrors()
{
// Print any errors or warnings found
string Err;
while (empty() == false)
{
bool Type = PopMessage(Err);
if (Type == true)
cerr << "E: " << Err << endl;
else
cerr << "W: " << Err << endl;
}
}
/*}}}*/
// GlobalError::Discard - Discard /*{{{*/
// ---------------------------------------------------------------------
/* */
void GlobalError::Discard()
{
while (List != 0)
{
Item *Old = List;
List = List->Next;
delete Old;
}
PendingFlag = false;
};
/*}}}*/
// GlobalError::Insert - Insert a new item at the end /*{{{*/
// ---------------------------------------------------------------------
/* */
void GlobalError::Insert(Item *Itm)
{
Item **End = &List;
for (Item *I = List; I != 0; I = I->Next)
End = &I->Next;
Itm->Next = *End;
*End = Itm;
}
/*}}}*/
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