apt-pkg/versionmatch.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: versionmatch.cc,v 1.9 2003/05/19 17:58:26 doogie Exp $
   4 /* ######################################################################
   5
   6    Version Matching
   7
   8    This module takes a matching string and a type and locates the version
   9    record that satisfies the constraint described by the matching string.
  10
  11    ##################################################################### */
  12                                                                         /*}}}*/
  13 // Include Files                                                        /*{{{*/
  14 #include <apt-pkg/versionmatch.h>
  15
  16 #include <apt-pkg/strutl.h>
  17 #include <apt-pkg/error.h>
  18
  19 #include <stdio.h>
  20 #include <ctype.h>
  21                                                                         /*}}}*/
  22
  23 // VersionMatch::pkgVersionMatch - Constructor                          /*{{{*/
  24 // ---------------------------------------------------------------------
  25 /* Break up the data string according to the selected type */
  26 pkgVersionMatch::pkgVersionMatch(string Data,MatchType Type) : Type(Type)
  27 {
  28    MatchAll = false;
  29    VerPrefixMatch = false;
  30    RelVerPrefixMatch = false;
  31
  32    if (Type == None || Data.length() < 1)
  33       return;
  34
  35    // Cut up the version representation
  36    if (Type == Version)
  37    {
  38       if (Data.end()[-1] == '*')
  39       {
  40          VerPrefixMatch = true;
  41          VerStr = string(Data,0,Data.length()-1);
  42       }
  43       else
  44          VerStr = Data;
  45       return;
  46    }
  47
  48    if (Type == Release)
  49    {
  50       // All empty = match all
  51       if (Data == "*")
  52       {
  53          MatchAll = true;
  54          return;
  55       }
  56
  57       // Are we a simple specification?
  58       string::const_iterator I = Data.begin();
  59       for (; I != Data.end() && *I != '='; I++);
  60       if (I == Data.end())
  61       {
  62          // Temporary
  63          if (isdigit(Data[0]))
  64             RelVerStr = Data;
  65          else
  66             RelRelease = Data;
  67
  68          if (RelVerStr.length() > 0 && RelVerStr.end()[-1] == '*')
  69          {
  70             RelVerPrefixMatch = true;
  71             RelVerStr = string(RelVerStr.begin(),RelVerStr.end()-1);
  72          }
  73          return;
  74       }
  75
  76       char Spec[300];
  77       char *Fragments[20];
  78       snprintf(Spec,sizeof(Spec),"%s",Data.c_str());
  79       if (TokSplitString(',',Spec,Fragments,
  80                          sizeof(Fragments)/sizeof(Fragments[0])) == false)
  81       {
  82          Type = None;
  83          return;
  84       }
  85
  86       for (unsigned J = 0; Fragments[J] != 0; J++)
  87       {
  88          if (strlen(Fragments[J]) < 3)
  89             continue;
  90
  91          if (stringcasecmp(Fragments[J],Fragments[J]+2,"v=") == 0)
  92             RelVerStr = Fragments[J]+2;
  93          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"o=") == 0)
  94             RelOrigin = Fragments[J]+2;
  95          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"a=") == 0)
  96             RelArchive = Fragments[J]+2;
  97          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"n=") == 0)
  98             RelCodename = Fragments[J]+2;
  99          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"l=") == 0)
 100             RelLabel = Fragments[J]+2;
 101          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"c=") == 0)
 102             RelComponent = Fragments[J]+2;
 103          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"b=") == 0)
 104             RelArchitecture = Fragments[J]+2;
 105       }
 106
 107       if (RelVerStr.end()[-1] == '*')
 108       {
 109          RelVerPrefixMatch = true;
 110          RelVerStr = string(RelVerStr.begin(),RelVerStr.end()-1);
 111       }
 112       return;
 113    }
 114
 115    if (Type == Origin)
 116    {
 117       OrSite = Data;
 118       return;
 119    }
 120 }
 121                                                                         /*}}}*/
 122 // VersionMatch::MatchVer - Match a version string with prefixing       /*{{{*/
 123 // ---------------------------------------------------------------------
 124 /* */
 125 bool pkgVersionMatch::MatchVer(const char *A,string B,bool Prefix)
 126 {
 127    const char *Ab = A;
 128    const char *Ae = Ab + strlen(A);
 129
 130    // Strings are not a compatible size.
 131    if (((unsigned)(Ae - Ab) != B.length() && Prefix == false) ||
 132        (unsigned)(Ae - Ab) < B.length())
 133       return false;
 134
 135    // Match (leading?)
 136    if (stringcasecmp(B,Ab,Ab + B.length()) == 0)
 137       return true;
 138
 139    return false;
 140 }
 141                                                                         /*}}}*/
 142 // VersionMatch::Find - Locate the best match for the select type       /*{{{*/
 143 // ---------------------------------------------------------------------
 144 /* */
 145 pkgCache::VerIterator pkgVersionMatch::Find(pkgCache::PkgIterator Pkg)
 146 {
 147    pkgCache::VerIterator Ver = Pkg.VersionList();
 148    for (; Ver.end() == false; Ver++)
 149    {
 150       if (Type == Version)
 151       {
 152          if (MatchVer(Ver.VerStr(),VerStr,VerPrefixMatch) == true)
 153             return Ver;
 154          continue;
 155       }
 156
 157       for (pkgCache::VerFileIterator VF = Ver.FileList(); VF.end() == false; VF++)
 158          if (FileMatch(VF.File()) == true)
 159             return Ver;
 160    }
 161
 162    // This will be Ended by now.
 163    return Ver;
 164 }
 165                                                                         /*}}}*/
 166 // VersionMatch::FileMatch - Match against an index file                /*{{{*/
 167 // ---------------------------------------------------------------------
 168 /* This matcher checks against the release file and the origin location
 169    to see if the constraints are met. */
 170 bool pkgVersionMatch::FileMatch(pkgCache::PkgFileIterator File)
 171 {
 172    if (Type == Release)
 173    {
 174       if (MatchAll == true)
 175          return true;
 176
 177 /*      cout << RelVerStr << ',' << RelOrigin << ',' << RelArchive << ',' << RelLabel << endl;
 178       cout << File.Version() << ',' << File.Origin() << ',' << File.Archive() << ',' << File.Label() << endl;*/
 179
 180       if (RelVerStr.empty() == true && RelOrigin.empty() == true &&
 181           RelArchive.empty() == true && RelLabel.empty() == true &&
 182           RelRelease.empty() == true && RelCodename.empty() == true &&
 183           RelComponent.empty() == true && RelArchitecture.empty() == true)
 184          return false;
 185
 186       if (RelVerStr.empty() == false)
 187          if (File->Version == 0 ||
 188              MatchVer(File.Version(),RelVerStr,RelVerPrefixMatch) == false)
 189             return false;
 190       if (RelOrigin.empty() == false)
 191          if (File->Origin == 0 ||
 192              stringcasecmp(RelOrigin,File.Origin()) != 0)
 193             return false;
 194       if (RelArchive.empty() == false)
 195          if (File->Archive == 0 ||
 196              stringcasecmp(RelArchive,File.Archive()) != 0)
 197             return false;
 198       if (RelCodename.empty() == false)
 199          if (File->Codename == 0 ||
 200              stringcasecmp(RelCodename,File.Codename()) != 0)
 201             return false;
 202       if (RelRelease.empty() == false)
 203          if ((File->Archive == 0 ||
 204              stringcasecmp(RelRelease,File.Archive()) != 0) &&
 205              (File->Codename == 0 ||
 206               stringcasecmp(RelRelease,File.Codename()) != 0))
 207                return false;
 208       if (RelLabel.empty() == false)
 209          if (File->Label == 0 ||
 210              stringcasecmp(RelLabel,File.Label()) != 0)
 211             return false;
 212       if (RelComponent.empty() == false)
 213          if (File->Component == 0 ||
 214              stringcasecmp(RelComponent,File.Component()) != 0)
 215             return false;
 216       if (RelArchitecture.empty() == false)
 217          if (File->Architecture == 0 ||
 218              stringcasecmp(RelArchitecture,File.Architecture()) != 0)
 219             return false;
 220       return true;
 221    }
 222
 223    if (Type == Origin)
 224    {
 225       if (OrSite.empty() == false) {
 226          if (File->Site == 0 || OrSite != File.Site())
 227             return false;
 228       } else // so we are talking about file:// or status file
 229          if (strcmp(File.Site(),"") == 0 && File->Archive != 0) // skip the status file
 230             return false;
 231       return (OrSite == File.Site());           /* both strings match */
 232    }
 233
 234    return false;
 235 }
 236                                                                         /*}}}*/