apt-pkg/versionmatch.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: versionmatch.cc,v 1.8 2003/04/24 03:16:58 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 #ifdef __GNUG__
  15 #pragma implementation "apt-pkg/versionmatch.h"
  16 #endif
  17 #include <apt-pkg/versionmatch.h>
  18
  19 #include <apt-pkg/strutl.h>
  20 #include <apt-pkg/error.h>
  21
  22 #include <stdio.h>
  23 #include <ctype.h>
  24                                                                         /*}}}*/
  25
  26 // VersionMatch::pkgVersionMatch - Constructor                          /*{{{*/
  27 // ---------------------------------------------------------------------
  28 /* Break up the data string according to the selected type */
  29 pkgVersionMatch::pkgVersionMatch(string Data,MatchType Type) : Type(Type)
  30 {
  31    MatchAll = false;
  32    VerPrefixMatch = false;
  33    RelVerPrefixMatch = false;
  34
  35    if (Type == None || Data.length() < 1)
  36       return;
  37
  38    // Cut up the version representation
  39    if (Type == Version)
  40    {
  41       if (Data.end()[-1] == '*')
  42       {
  43          VerPrefixMatch = true;
  44          VerStr = string(Data,0,Data.length()-1);
  45       }
  46       else
  47          VerStr = Data;
  48       return;
  49    }
  50
  51    if (Type == Release)
  52    {
  53       // All empty = match all
  54       if (Data == "*")
  55       {
  56          MatchAll = true;
  57          return;
  58       }
  59
  60       // Are we a simple specification?
  61       string::const_iterator I = Data.begin();
  62       for (; I != Data.end() && *I != '='; I++);
  63       if (I == Data.end())
  64       {
  65          // Temporary
  66          if (isdigit(Data[0]))
  67             RelVerStr = Data;
  68          else
  69             RelArchive = Data;
  70
  71          if (RelVerStr.length() > 0 && RelVerStr.end()[-1] == '*')
  72          {
  73             RelVerPrefixMatch = true;
  74             RelVerStr = string(RelVerStr.begin(),RelVerStr.end()-1);
  75          }
  76          return;
  77       }
  78
  79       char Spec[300];
  80       char *Fragments[20];
  81       snprintf(Spec,sizeof(Spec),"%s",Data.c_str());
  82       if (TokSplitString(',',Spec,Fragments,
  83                          sizeof(Fragments)/sizeof(Fragments[0])) == false)
  84       {
  85          Type = None;
  86          return;
  87       }
  88
  89       for (unsigned J = 0; Fragments[J] != 0; J++)
  90       {
  91          if (strlen(Fragments[J]) < 3)
  92             continue;
  93
  94          if (stringcasecmp(Fragments[J],Fragments[J]+2,"v=") == 0)
  95             RelVerStr = Fragments[J]+2;
  96          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"o=") == 0)
  97             RelOrigin = Fragments[J]+2;
  98          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"a=") == 0)
  99             RelArchive = Fragments[J]+2;
 100          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"l=") == 0)
 101             RelLabel = Fragments[J]+2;
 102          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"c=") == 0)
 103             RelComponent = Fragments[J]+2;
 104       }
 105
 106       if (RelVerStr.end()[-1] == '*')
 107       {
 108          RelVerPrefixMatch = true;
 109          RelVerStr = string(RelVerStr.begin(),RelVerStr.end()-1);
 110       }
 111       return;
 112    }
 113
 114    if (Type == Origin)
 115    {
 116       OrSite = Data;
 117       return;
 118    }
 119 }
 120                                                                         /*}}}*/
 121 // VersionMatch::MatchVer - Match a version string with prefixing       /*{{{*/
 122 // ---------------------------------------------------------------------
 123 /* */
 124 bool pkgVersionMatch::MatchVer(const char *A,string B,bool Prefix)
 125 {
 126    const char *Ab = A;
 127    const char *Ae = Ab + strlen(A);
 128
 129    // Strings are not a compatible size.
 130    if ((unsigned)(Ae - Ab) != B.length() && Prefix == false ||
 131        (unsigned)(Ae - Ab) < B.length())
 132       return false;
 133
 134    // Match (leading?)
 135    if (stringcasecmp(B,Ab,Ab + B.length()) == 0)
 136       return true;
 137
 138    return false;
 139 }
 140                                                                         /*}}}*/
 141 // VersionMatch::Find - Locate the best match for the select type       /*{{{*/
 142 // ---------------------------------------------------------------------
 143 /* */
 144 pkgCache::VerIterator pkgVersionMatch::Find(pkgCache::PkgIterator Pkg)
 145 {
 146    pkgCache::VerIterator Ver = Pkg.VersionList();
 147    for (; Ver.end() == false; Ver++)
 148    {
 149       if (Type == Version)
 150       {
 151          if (MatchVer(Ver.VerStr(),VerStr,VerPrefixMatch) == true)
 152             return Ver;
 153          continue;
 154       }
 155
 156       for (pkgCache::VerFileIterator VF = Ver.FileList(); VF.end() == false; VF++)
 157          if (FileMatch(VF.File()) == true)
 158             return Ver;
 159    }
 160
 161    // This will be Ended by now.
 162    return Ver;
 163 }
 164                                                                         /*}}}*/
 165 // VersionMatch::FileMatch - Match against an index file                /*{{{*/
 166 // ---------------------------------------------------------------------
 167 /* This matcher checks against the release file and the origin location
 168    to see if the constraints are met. */
 169 bool pkgVersionMatch::FileMatch(pkgCache::PkgFileIterator File)
 170 {
 171    if (Type == Release)
 172    {
 173       if (MatchAll == true)
 174          return true;
 175
 176 /*      cout << RelVerStr << ',' << RelOrigin << ',' << RelArchive << ',' << RelLabel << endl;
 177       cout << File.Version() << ',' << File.Origin() << ',' << File.Archive() << ',' << File.Label() << endl;*/
 178
 179       if (RelVerStr.empty() == true && RelOrigin.empty() == true &&
 180           RelArchive.empty() == true && RelLabel.empty() == true &&
 181           RelComponent.empty() == true)
 182          return false;
 183
 184       if (RelVerStr.empty() == false)
 185          if (File->Version == 0 ||
 186              MatchVer(File.Version(),RelVerStr,RelVerPrefixMatch) == false)
 187             return false;
 188       if (RelOrigin.empty() == false)
 189          if (File->Origin == 0 ||
 190              stringcasecmp(RelOrigin,File.Origin()) != 0)
 191             return false;
 192       if (RelArchive.empty() == false)
 193       {
 194          if (File->Archive == 0 ||
 195              stringcasecmp(RelArchive,File.Archive()) != 0)
 196             return false;
 197       }
 198       if (RelLabel.empty() == false)
 199          if (File->Label == 0 ||
 200              stringcasecmp(RelLabel,File.Label()) != 0)
 201             return false;
 202       if (RelComponent.empty() == false)
 203          if (File->Component == 0 ||
 204              stringcasecmp(RelComponent,File.Component()) != 0)
 205             return false;
 206       return true;
 207    }
 208
 209    if (Type == Origin)
 210    {
 211       if (!strcmp(File.Archive(), "now"))       /* ignore local "status" file */
 212          return false;
 213       return (OrSite == File.Site());           /* both strings match */
 214    }
 215
 216    return false;
 217 }
 218                                                                         /*}}}*/