apt-pkg/deb/debversion.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: debversion.cc,v 1.8 2003/09/10 23:39:49 mdz 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    {
  52       if (*B == '~') return 1;
  53       return -1;
  54    }
  55    if (B >= BEnd)
  56    {
  57       if (*A == '~') return -1;
  58       return 1;
  59    }
  60
  61    /* Iterate over the whole string
  62       What this does is to spilt the whole string into groups of
  63       numeric and non numeric portions. For instance:
  64          a67bhgs89
  65       Has 4 portions 'a', '67', 'bhgs', '89'. A more normal:
  66          2.7.2-linux-1
  67       Has '2', '.', '7', '.' ,'-linux-','1' */
  68    const char *lhs = A;
  69    const char *rhs = B;
  70    while (lhs != AEnd && rhs != BEnd)
  71    {
  72       int first_diff = 0;
  73
  74       while (lhs != AEnd && rhs != BEnd &&
  75              (!isdigit(*lhs) || !isdigit(*rhs)))
  76       {
  77          int vc = order(*lhs);
  78          int rc = order(*rhs);
  79          if (vc != rc)
  80             return vc - rc;
  81          lhs++; rhs++;
  82       }
  83
  84       while (*lhs == '0')
  85          lhs++;
  86       while (*rhs == '0')
  87          rhs++;
  88       while (isdigit(*lhs) && isdigit(*rhs))
  89       {
  90          if (!first_diff)
  91             first_diff = *lhs - *rhs;
  92          lhs++;
  93          rhs++;
  94       }
  95
  96       if (isdigit(*lhs))
  97          return 1;
  98       if (isdigit(*rhs))
  99          return -1;
 100       if (first_diff)
 101          return first_diff;
 102    }
 103
 104    // The strings must be equal
 105    if (lhs == AEnd && rhs == BEnd)
 106       return 0;
 107
 108    // lhs is shorter
 109    if (lhs == AEnd)
 110    {
 111       if (*rhs == '~') return 1;
 112       return -1;
 113    }
 114
 115    // rhs is shorter
 116    if (rhs == BEnd)
 117    {
 118       if (*lhs == '~') return -1;
 119       return 1;
 120    }
 121
 122    // Shouldnt happen
 123    return 1;
 124 }
 125                                                                         /*}}}*/
 126 // debVS::CmpVersion - Comparison for versions                          /*{{{*/
 127 // ---------------------------------------------------------------------
 128 /* This fragments the version into E:V-R triples and compares each
 129    portion separately. */
 130 int debVersioningSystem::DoCmpVersion(const char *A,const char *AEnd,
 131                                       const char *B,const char *BEnd)
 132 {
 133    // Strip off the epoch and compare it
 134    const char *lhs = A;
 135    const char *rhs = B;
 136    for (;lhs != AEnd && *lhs != ':'; lhs++);
 137    for (;rhs != BEnd && *rhs != ':'; rhs++);
 138    if (lhs == AEnd)
 139       lhs = A;
 140    if (rhs == BEnd)
 141       rhs = B;
 142
 143    // Compare the epoch
 144    int Res = CmpFragment(A,lhs,B,rhs);
 145    if (Res != 0)
 146       return Res;
 147
 148    // Skip the :
 149    if (lhs != A)
 150       lhs++;
 151    if (rhs != B)
 152       rhs++;
 153
 154    // Find the last -
 155    const char *dlhs = AEnd-1;
 156    const char *drhs = BEnd-1;
 157    for (;dlhs > lhs && *dlhs != '-'; dlhs--);
 158    for (;drhs > rhs && *drhs != '-'; drhs--);
 159
 160    if (dlhs == lhs)
 161       dlhs = AEnd;
 162    if (drhs == rhs)
 163       drhs = BEnd;
 164
 165    // Compare the main version
 166    Res = CmpFragment(lhs,dlhs,rhs,drhs);
 167    if (Res != 0)
 168       return Res;
 169
 170    // Skip the -
 171    if (dlhs != lhs)
 172       dlhs++;
 173    if (drhs != rhs)
 174       drhs++;
 175
 176    return CmpFragment(dlhs,AEnd,drhs,BEnd);
 177 }
 178                                                                         /*}}}*/
 179 // debVS::CheckDep - Check a single dependency                          /*{{{*/
 180 // ---------------------------------------------------------------------
 181 /* This simply preforms the version comparison and switch based on
 182    operator. If DepVer is 0 then we are comparing against a provides
 183    with no version. */
 184 bool debVersioningSystem::CheckDep(const char *PkgVer,
 185                                    int Op,const char *DepVer)
 186 {
 187    if (DepVer == 0 || DepVer[0] == 0)
 188       return true;
 189    if (PkgVer == 0 || PkgVer[0] == 0)
 190       return false;
 191
 192    // Perform the actual comparision.
 193    int Res = CmpVersion(PkgVer,DepVer);
 194    switch (Op & 0x0F)
 195    {
 196       case pkgCache::Dep::LessEq:
 197       if (Res <= 0)
 198          return true;
 199       break;
 200
 201       case pkgCache::Dep::GreaterEq:
 202       if (Res >= 0)
 203          return true;
 204       break;
 205
 206       case pkgCache::Dep::Less:
 207       if (Res < 0)
 208          return true;
 209       break;
 210
 211       case pkgCache::Dep::Greater:
 212       if (Res > 0)
 213          return true;
 214       break;
 215
 216       case pkgCache::Dep::Equals:
 217       if (Res == 0)
 218          return true;
 219       break;
 220
 221       case pkgCache::Dep::NotEquals:
 222       if (Res != 0)
 223          return true;
 224       break;
 225    }
 226
 227    return false;
 228 }
 229                                                                         /*}}}*/
 230 // debVS::UpstreamVersion - Return the upstream version string          /*{{{*/
 231 // ---------------------------------------------------------------------
 232 /* This strips all the debian specific information from the version number */
 233 string debVersioningSystem::UpstreamVersion(const char *Ver)
 234 {
 235    // Strip off the bit before the first colon
 236    const char *I = Ver;
 237    for (; *I != 0 && *I != ':'; I++);
 238    if (*I == ':')
 239       Ver = I + 1;
 240
 241    // Chop off the trailing -
 242    I = Ver;
 243    unsigned Last = strlen(Ver);
 244    for (; *I != 0; I++)
 245       if (*I == '-')
 246          Last = I - Ver;
 247
 248    return string(Ver,Last);
 249 }
 250                                                                         /*}}}*/