src/base/TextException.cc

   1 /*
   2  * Copyright (C) 1996-2018 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #include "squid.h"
  10 #include "base/TextException.h"
  11 #include "Debug.h"
  12 #include "sbuf/SBuf.h"
  13 #include "util.h"
  14
  15 TextException::TextException()
  16 {
  17     message=NULL;
  18     theFileName=NULL;
  19     theLineNo=0;
  20     theId=0;
  21 }
  22
  23 TextException::TextException(const TextException& right) :
  24     message((right.message?xstrdup(right.message):NULL)), theFileName(right.theFileName), theLineNo(right.theLineNo), theId(right.theId)
  25 {
  26 }
  27
  28 TextException::TextException(const char *aMsg, const char *aFileName, int aLineNo, unsigned int anId):
  29     message(aMsg?xstrdup(aMsg):NULL), theFileName(aFileName), theLineNo(aLineNo), theId(anId)
  30 {}
  31
  32 TextException::TextException(SBuf msg, const char *aFileName, int aLineNo, unsigned int anId):
  33     TextException(msg.c_str(), aFileName, aLineNo, anId)
  34 {}
  35
  36 TextException::~TextException() throw()
  37 {
  38     if (message) xfree(message);
  39 }
  40
  41 TextException& TextException::operator=(const TextException &right)
  42 {
  43     if (this==&right) return *this;
  44     if (message) xfree(message);
  45     message=(right.message?xstrdup(right.message):NULL);
  46     theFileName=right.theFileName;
  47     theLineNo=right.theLineNo;
  48     theId=right.theId;
  49     return *this;
  50 }
  51
  52 const char *TextException::what() const throw()
  53 {
  54     /// \todo add file:lineno
  55     return message ? message : "TextException without a message";
  56 }
  57
  58 unsigned int TextException::FileNameHash(const char *fname)
  59 {
  60     const char *s = NULL;
  61     unsigned int n = 0;
  62     unsigned int j = 0;
  63     unsigned int i = 0;
  64     s = strrchr(fname, '/');
  65
  66     if (s)
  67         ++s;
  68     else
  69         s = fname;
  70
  71     while (*s) {
  72         ++j;
  73         n ^= 271 * (unsigned) *s;
  74         ++s;
  75     }
  76     i = n ^ (j * 271);
  77     /*18bits of a 32 bit integer used  for filename hash (max hash=262143),
  78       and 14 bits for storing line number (16k max).
  79       If you change this policy remember to update the FileNameHash function
  80       in the scripts/calc-must-ids.pl script
  81     */
  82     return i % 262143;
  83 }
  84
  85 void Throw(const char *message, const char *fileName, int lineNo, unsigned int id)
  86 {
  87
  88     // or should we let the exception recepient print the exception instead?
  89
  90     if (fileName) {
  91         debugs(0, 3, fileName << ':' << lineNo << ": exception" <<
  92                (message ? ": " : ".") << (message ? message : ""));
  93     } else {
  94         debugs(0, 3, "exception" <<
  95                (message ? ": " : ".") << (message ? message : ""));
  96     }
  97
  98     throw TextException(message, fileName, lineNo, id);
  99 }
 100