src/base/TextException.cc

   1 /*
   2  * Copyright (C) 1996-2017 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 "util.h"
  13
  14 TextException::TextException()
  15 {
  16     message=NULL;
  17     theFileName=NULL;
  18     theLineNo=0;
  19     theId=0;
  20 }
  21
  22 TextException::TextException(const TextException& right) :
  23     message((right.message?xstrdup(right.message):NULL)), theFileName(right.theFileName), theLineNo(right.theLineNo), theId(right.theId)
  24 {
  25 }
  26
  27 TextException::TextException(const char *aMsg, const char *aFileName, int aLineNo, unsigned int anId):
  28     message(aMsg?xstrdup(aMsg):NULL), theFileName(aFileName), theLineNo(aLineNo), theId(anId)
  29 {}
  30
  31 TextException::~TextException() throw()
  32 {
  33     if (message) xfree(message);
  34 }
  35
  36 TextException& TextException::operator=(const TextException &right)
  37 {
  38     if (this==&right) return *this;
  39     if (message) xfree(message);
  40     message=(right.message?xstrdup(right.message):NULL);
  41     theFileName=right.theFileName;
  42     theLineNo=right.theLineNo;
  43     theId=right.theId;
  44     return *this;
  45 }
  46
  47 const char *TextException::what() const throw()
  48 {
  49     /// \todo add file:lineno
  50     return message ? message : "TextException without a message";
  51 }
  52
  53 unsigned int TextException::FileNameHash(const char *fname)
  54 {
  55     const char *s = NULL;
  56     unsigned int n = 0;
  57     unsigned int j = 0;
  58     unsigned int i = 0;
  59     s = strrchr(fname, '/');
  60
  61     if (s)
  62         ++s;
  63     else
  64         s = fname;
  65
  66     while (*s) {
  67         ++j;
  68         n ^= 271 * (unsigned) *s;
  69         ++s;
  70     }
  71     i = n ^ (j * 271);
  72     /*18bits of a 32 bit integer used  for filename hash (max hash=262143),
  73       and 14 bits for storing line number (16k max).
  74       If you change this policy remember to update the FileNameHash function
  75       in the scripts/calc-must-ids.pl script
  76     */
  77     return i % 262143;
  78 }
  79
  80 void Throw(const char *message, const char *fileName, int lineNo, unsigned int id)
  81 {
  82
  83     // or should we let the exception recepient print the exception instead?
  84
  85     if (fileName) {
  86         debugs(0, 3, fileName << ':' << lineNo << ": exception" <<
  87                (message ? ": " : ".") << (message ? message : ""));
  88     } else {
  89         debugs(0, 3, "exception" <<
  90                (message ? ": " : ".") << (message ? message : ""));
  91     }
  92
  93     throw TextException(message, fileName, lineNo, id);
  94 }
  95