apt-pkg/deb/debversion.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: debversion.cc,v 1.5 2002/11/23 07:54:36 jgg Exp $
   4 /* ######################################################################
   5
   6    Debian Version - Versioning system for Debian
   7
   8    This implements the standard Debian versioning system.
   9
  10    ##################################################################### */
  11                                                                         /*}}}*/
  12 // Include Files                                                        /*{{{*/
  13 #define APT_COMPATIBILITY 986
  14 #ifdef __GNUG__
  15 #pragma implementation "apt-pkg/debversion.h"
  16 #endif
  17
  18 #include <apt-pkg/debversion.h>
  19 #include <apt-pkg/pkgcache.h>
  20
  21 #include <stdlib.h>
  22 #include <ctype.h>
  23                                                                         /*}}}*/
  24
  25 debVersioningSystem debVS;
  26
  27 // debVS::debVersioningSystem - Constructor                             /*{{{*/
  28 // ---------------------------------------------------------------------
  29 /* */
  30 debVersioningSystem::debVersioningSystem()
  31 {
  32    Label = "Standard .deb";
  33 }
  34                                                                         /*}}}*/
  35
  36 // debVS::CmpFragment - Compare versions                                /*{{{*/
  37 // ---------------------------------------------------------------------
  38 /* This compares a fragment of the version. This is a slightly adapted
  39    version of what dpkg uses. */
  40 #define order(x) ((x) == '~' ? -1    \
  41                 : isdigit((x)) ? 0   \
  42                 : !(x) ? 0           \
  43                 : isalpha((x)) ? (x) \
  44                 : (x) + 256)
  45 int debVersioningSystem::CmpFragment(const char *A,const char *AEnd,
  46                                      const char *B,const char *BEnd)
  47 {
  48    if (A >= AEnd && B >= BEnd)
  49       return 0;
  50    if (A >= AEnd)
  51       return -1;
  52    if (B >= BEnd)
  53       return 1;
  54
  55    /* Iterate over the whole string
  56       What this does is to spilt the whole string into groups of
  57       numeric and non numeric portions. For instance:
  58          a67bhgs89
  59       Has 4 portions 'a', '67', 'bhgs', '89'. A more normal:
  60          2.7.2-linux-1
  61       Has '2', '.', '7', '.' ,'-linux-','1' */
  62    const char *lhs = A;
  63    const char *rhs = B;
  64    while (lhs != AEnd && rhs != BEnd)
  65    {
  66       // Starting points
  67       const char *Slhs = lhs;
  68       const char *Srhs = rhs;
  69       int first_diff = 0;
  70
  71       while ((lhs != AEnd && !isdigit(*lhs)) ||
  72              (rhs != BEnd && !isdigit(*rhs)) )
  73       {
  74          int vc = order(*lhs);
  75          int rc = order(*rhs);
  76          if (vc != rc)
  77             return vc - rc;
  78          lhs++; rhs++;
  79       }
  80
  81       while (*lhs == '0')
  82          lhs++;
  83       while (*rhs == '0')
  84          rhs++;
  85       while (isdigit(*lhs) && isdigit(*rhs))
  86       {
  87          if (!first_diff)
  88             first_diff = *lhs - *rhs;
  89          lhs++;
  90          rhs++;
  91       }
  92
  93       if (isdigit(*lhs))
  94          return 1;
  95       if (isdigit(*rhs))
  96          return -1;
  97       if (first_diff)
  98          return first_diff;
  99    }
 100
 101    // The strings must be equal
 102    if (lhs == AEnd && rhs == BEnd)
 103       return 0;
 104
 105    // lhs is shorter
 106    if (lhs == AEnd)
 107       return -1;
 108
 109    // rhs is shorter
 110    if (rhs == BEnd)
 111       return 1;
 112
 113    // Shouldnt happen
 114    return 1;
 115 }
 116                                                                         /*}}}*/
 117 // debVS::CmpVersion - Comparison for versions                          /*{{{*/
 118 // ---------------------------------------------------------------------
 119 /* This fragments the version into E:V-R triples and compares each
 120    portion separately. */
 121 int debVersioningSystem::DoCmpVersion(const char *A,const char *AEnd,
 122                                       const char *B,const char *BEnd)
 123 {
 124    // Strip off the epoch and compare it
 125    const char *lhs = A;
 126    const char *rhs = B;
 127    for (;lhs != AEnd && *lhs != ':'; lhs++);
 128    for (;rhs != BEnd && *rhs != ':'; rhs++);
 129    if (lhs == AEnd)
 130       lhs = A;
 131    if (rhs == BEnd)
 132       rhs = B;
 133
 134    // Compare the epoch
 135    int Res = CmpFragment(A,lhs,B,rhs);
 136    if (Res != 0)
 137       return Res;
 138
 139    // Skip the :
 140    if (lhs != A)
 141       lhs++;
 142    if (rhs != B)
 143       rhs++;
 144
 145    // Find the last -
 146    const char *dlhs = AEnd-1;
 147    const char *drhs = BEnd-1;
 148    for (;dlhs > lhs && *dlhs != '-'; dlhs--);
 149    for (;drhs > rhs && *drhs != '-'; drhs--);
 150
 151    if (dlhs == lhs)
 152       dlhs = AEnd;
 153    if (drhs == rhs)
 154       drhs = BEnd;
 155
 156    // Compare the main version
 157    Res = CmpFragment(lhs,dlhs,rhs,drhs);
 158    if (Res != 0)
 159       return Res;
 160
 161    // Skip the -
 162    if (dlhs != lhs)
 163       dlhs++;
 164    if (drhs != rhs)
 165       drhs++;
 166
 167    return CmpFragment(dlhs,AEnd,drhs,BEnd);
 168 }
 169                                                                         /*}}}*/
 170 // debVS::CheckDep - Check a single dependency                          /*{{{*/
 171 // ---------------------------------------------------------------------
 172 /* This simply preforms the version comparison and switch based on
 173    operator. If DepVer is 0 then we are comparing against a provides
 174    with no version. */
 175 bool debVersioningSystem::CheckDep(const char *PkgVer,
 176                                    int Op,const char *DepVer)
 177 {
 178    if (DepVer == 0 || DepVer[0] == 0)
 179       return true;
 180    if (PkgVer == 0 || PkgVer[0] == 0)
 181       return false;
 182
 183    // Perform the actual comparision.
 184    int Res = CmpVersion(PkgVer,DepVer);
 185    switch (Op & 0x0F)
 186    {
 187       case pkgCache::Dep::LessEq:
 188       if (Res <= 0)
 189          return true;
 190       break;
 191
 192       case pkgCache::Dep::GreaterEq:
 193       if (Res >= 0)
 194          return true;
 195       break;
 196
 197       case pkgCache::Dep::Less:
 198       if (Res < 0)
 199          return true;
 200       break;
 201
 202       case pkgCache::Dep::Greater:
 203       if (Res > 0)
 204          return true;
 205       break;
 206
 207       case pkgCache::Dep::Equals:
 208       if (Res == 0)
 209          return true;
 210       break;
 211
 212       case pkgCache::Dep::NotEquals:
 213       if (Res != 0)
 214          return true;
 215       break;
 216    }
 217
 218    return false;
 219 }
 220                                                                         /*}}}*/
 221 // debVS::UpstreamVersion - Return the upstream version string          /*{{{*/
 222 // ---------------------------------------------------------------------
 223 /* This strips all the debian specific information from the version number */
 224 string debVersioningSystem::UpstreamVersion(const char *Ver)
 225 {
 226    // Strip off the bit before the first colon
 227    const char *I = Ver;
 228    for (; *I != 0 && *I != ':'; I++);
 229    if (*I == ':')
 230       Ver = I + 1;
 231
 232    // Chop off the trailing -
 233    I = Ver;
 234    unsigned Last = strlen(Ver);
 235    for (; *I != 0; I++)
 236       if (*I == '-')
 237          Last = I - Ver;
 238
 239    return string(Ver,Last);
 240 }
 241                                                                         /*}}}*/