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-rw-r--r--apt-pkg/deb/debversion.cc266
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diff --git a/apt-pkg/deb/debversion.cc b/apt-pkg/deb/debversion.cc
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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+// $Id: debversion.cc,v 1.2 2001/02/20 07:03:17 jgg Exp $
+/* ######################################################################
+
+ Debian Version - Versioning system for Debian
+
+ This implements the standard Debian versioning system.
+
+ ##################################################################### */
+ /*}}}*/
+// Include Files /*{{{*/
+#define APT_COMPATIBILITY 986
+#ifdef __GNUG__
+#pragma implementation "apt-pkg/debversion.h"
+#endif
+
+#include <apt-pkg/debversion.h>
+#include <apt-pkg/pkgcache.h>
+
+#include <stdlib.h>
+ /*}}}*/
+
+debVersioningSystem debVS;
+
+// debVS::debVersioningSystem - Constructor /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+debVersioningSystem::debVersioningSystem()
+{
+ Label = "Standard .deb";
+}
+ /*}}}*/
+// StrToLong - Convert the string between two iterators to a long /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+static unsigned long StrToLong(const char *begin,const char *end)
+{
+ char S[40];
+ char *I = S;
+ for (; begin != end && I < S + 40;)
+ *I++ = *begin++;
+ *I = 0;
+ return strtoul(S,0,10);
+}
+ /*}}}*/
+// debVS::CmpFragment - Compare versions /*{{{*/
+// ---------------------------------------------------------------------
+/* This compares a fragment of the version. Dpkg has a really short
+ version of this, but it is uh.. interesting to grok. */
+int debVersioningSystem::CmpFragment(const char *A,const char *AEnd,
+ const char *B,const char *BEnd)
+{
+ if (A >= AEnd && B >= BEnd)
+ return 0;
+ if (A >= AEnd)
+ return -1;
+ if (B >= BEnd)
+ return 1;
+
+ /* Iterate over the whole string
+ What this does is to spilt the whole string into groups of
+ numeric and non numeric portions. For instance:
+ a67bhgs89
+ Has 4 portions 'a', '67', 'bhgs', '89'. A more normal:
+ 2.7.2-linux-1
+ Has '2', '.', '7', '.' ,'-linux-','1' */
+ const char *lhs = A;
+ const char *rhs = B;
+ while (lhs != AEnd && rhs != BEnd)
+ {
+ // Starting points
+ const char *Slhs = lhs;
+ const char *Srhs = rhs;
+
+ // Compute ending points were we have passed over the portion
+ bool Digit = (isdigit(*lhs) > 0?true:false);
+ for (;lhs != AEnd && (isdigit(*lhs) > 0?true:false) == Digit; lhs++);
+ for (;rhs != BEnd && (isdigit(*rhs) > 0?true:false) == Digit; rhs++);
+
+ if (Digit == true)
+ {
+ // If the lhs has a digit and the rhs does not then <
+ if (rhs - Srhs == 0)
+ return -1;
+
+ // Generate integers from the strings.
+ unsigned long Ilhs = StrToLong(Slhs,lhs);
+ unsigned long Irhs = StrToLong(Srhs,rhs);
+ if (Ilhs != Irhs)
+ {
+ if (Ilhs > Irhs)
+ return 1;
+ return -1;
+ }
+ }
+ else
+ {
+ // They are equal length so do a straight text compare
+ for (;Slhs != lhs && Srhs != rhs; Slhs++, Srhs++)
+ {
+ if (*Slhs != *Srhs)
+ {
+ /* We need to compare non alpha chars as higher than alpha
+ chars (a < !) */
+ int lc = *Slhs;
+ int rc = *Srhs;
+ if (isalpha(lc) == 0) lc += 256;
+ if (isalpha(rc) == 0) rc += 256;
+ if (lc > rc)
+ return 1;
+ return -1;
+ }
+ }
+
+ // If the lhs is shorter than the right it is 'less'
+ if (lhs - Slhs < rhs - Srhs)
+ return -1;
+
+ // If the lhs is longer than the right it is 'more'
+ if (lhs - Slhs > rhs - Srhs)
+ return 1;
+ }
+ }
+
+ // The strings must be equal
+ if (lhs == AEnd && rhs == BEnd)
+ return 0;
+
+ // lhs is shorter
+ if (lhs == AEnd)
+ return -1;
+
+ // rhs is shorter
+ if (rhs == BEnd)
+ return 1;
+
+ // Shouldnt happen
+ return 1;
+}
+ /*}}}*/
+// debVS::CmpVersion - Comparison for versions /*{{{*/
+// ---------------------------------------------------------------------
+/* This fragments the version into E:V-R triples and compares each
+ portion separately. */
+int debVersioningSystem::DoCmpVersion(const char *A,const char *AEnd,
+ const char *B,const char *BEnd)
+{
+ // Strip off the epoch and compare it
+ const char *lhs = A;
+ const char *rhs = B;
+ for (;lhs != AEnd && *lhs != ':'; lhs++);
+ for (;rhs != BEnd && *rhs != ':'; rhs++);
+ if (lhs == AEnd)
+ lhs = A;
+ if (rhs == BEnd)
+ rhs = B;
+
+ // Compare the epoch
+ int Res = CmpFragment(A,lhs,B,rhs);
+ if (Res != 0)
+ return Res;
+
+ // Skip the :
+ if (lhs != A)
+ lhs++;
+ if (rhs != B)
+ rhs++;
+
+ // Find the last -
+ const char *dlhs = AEnd-1;
+ const char *drhs = BEnd-1;
+ for (;dlhs > lhs && *dlhs != '-'; dlhs--);
+ for (;drhs > rhs && *drhs != '-'; drhs--);
+
+ if (dlhs == lhs)
+ dlhs = AEnd;
+ if (drhs == rhs)
+ drhs = BEnd;
+
+ // Compare the main version
+ Res = CmpFragment(lhs,dlhs,rhs,drhs);
+ if (Res != 0)
+ return Res;
+
+ // Skip the -
+ if (dlhs != lhs)
+ dlhs++;
+ if (drhs != rhs)
+ drhs++;
+
+ return CmpFragment(dlhs,AEnd,drhs,BEnd);
+}
+ /*}}}*/
+// debVS::CheckDep - Check a single dependency /*{{{*/
+// ---------------------------------------------------------------------
+/* This simply preforms the version comparison and switch based on
+ operator. If DepVer is 0 then we are comparing against a provides
+ with no version. */
+bool debVersioningSystem::CheckDep(const char *PkgVer,
+ int Op,const char *DepVer)
+{
+ if (DepVer == 0 || DepVer[0] == 0)
+ return true;
+ if (PkgVer == 0 || PkgVer[0] == 0)
+ return false;
+
+ // Perform the actual comparision.
+ int Res = CmpVersion(PkgVer,DepVer);
+ switch (Op & 0x0F)
+ {
+ case pkgCache::Dep::LessEq:
+ if (Res <= 0)
+ return true;
+ break;
+
+ case pkgCache::Dep::GreaterEq:
+ if (Res >= 0)
+ return true;
+ break;
+
+ case pkgCache::Dep::Less:
+ if (Res < 0)
+ return true;
+ break;
+
+ case pkgCache::Dep::Greater:
+ if (Res > 0)
+ return true;
+ break;
+
+ case pkgCache::Dep::Equals:
+ if (Res == 0)
+ return true;
+ break;
+
+ case pkgCache::Dep::NotEquals:
+ if (Res != 0)
+ return true;
+ break;
+ }
+
+ return false;
+}
+ /*}}}*/
+// debVS::UpstreamVersion - Return the upstream version string /*{{{*/
+// ---------------------------------------------------------------------
+/* This strips all the debian specific information from the version number */
+string debVersioningSystem::UpstreamVersion(const char *Ver)
+{
+ // Strip off the bit before the first colon
+ const char *I = Ver;
+ for (; *I != 0 && *I != ':'; I++);
+ if (*I == ':')
+ Ver = I + 1;
+
+ // Chop off the trailing -
+ I = Ver;
+ unsigned Last = strlen(Ver);
+ for (; *I != 0; I++)
+ if (*I == '-')
+ Last = I - Ver;
+
+ return string(Ver,Last);
+}
+ /*}}}*/
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