// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
-// $Id: version.cc,v 1.4 1998/07/12 23:58:42 jgg Exp $
+// $Id: version.cc,v 1.10 2001/02/20 07:03:17 jgg Exp $
/* ######################################################################
- Version - Version string
-
- Version comparing is done using the == and < operators. STL's
- function.h provides the remaining set of comparitors. A directly
- callable non-string class version is provided for functions manipulating
- the cache file (esp the sort function).
-
- A version is defined to be equal if a case sensitive compare returns
- that the two strings are the same. For compatibility with the QSort
- function this version returns -1,0,1.
+ Version - Versioning system..
##################################################################### */
/*}}}*/
#include <stdlib.h>
/*}}}*/
+
+static pkgVersioningSystem *VSList[10];
+pkgVersioningSystem **pkgVersioningSystem::GlobalList = VSList;
+unsigned long pkgVersioningSystem::GlobalListLen = 0;
-// Version::pkgVersion - Default Constructor /*{{{*/
-// ---------------------------------------------------------------------
-/* */
-pkgVersion::pkgVersion()
-{
-}
- /*}}}*/
-// Version::operator == - Checks if two versions are equal /*{{{*/
-// ---------------------------------------------------------------------
-/* We can't simply perform a string compare because of epochs. */
-bool pkgVersion::operator ==(const pkgVersion &Vrhs) const
-{
- if (pkgVersionCompare(Value.begin(),Value.end(),
- Vrhs.Value.begin(),Vrhs.Value.end()) == 0)
- return true;
- return false;
-}
- /*}}}*/
-// Version::operator < - Checks if this is less than another version /*{{{*/
-// ---------------------------------------------------------------------
-/* All other forms of comparision can be built up from this single function.
- a > b -> b < a
- a <= b -> !(a > b) -> !(b < a)
- a >= b -> !(a < b)
- */
-bool pkgVersion::operator <(const pkgVersion &Vrhs) const
-{
- if (pkgVersionCompare(Value.begin(),Value.end(),
- Vrhs.Value.begin(),Vrhs.Value.end()) == -1)
- return true;
- return false;
-}
- /*}}}*/
-// 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);
-}
- /*}}}*/
-// VersionCompare (op) - Greater than comparison for versions /*{{{*/
+// pkgVS::pkgVersioningSystem - Constructor /*{{{*/
// ---------------------------------------------------------------------
-/* */
-int pkgVersionCompare(const char *A, const char *B)
-{
- return pkgVersionCompare(A,A + strlen(A),B,B + strlen(B));
-}
-int pkgVersionCompare(string A,string B)
+/* Link to the global list of versioning systems supported */
+pkgVersioningSystem::pkgVersioningSystem()
{
- return pkgVersionCompare(A.begin(),A.end(),B.begin(),B.end());
+ VSList[GlobalListLen] = this;
+ GlobalListLen++;
}
-
/*}}}*/
-// VersionCompare - Greater than comparison for versions /*{{{*/
+// pkgVS::GetVS - Find a VS by name /*{{{*/
// ---------------------------------------------------------------------
/* */
-int pkgVersionCompare(const char *A, const char *AEnd, const char *B,
- const char *BEnd)
+pkgVersioningSystem *pkgVersioningSystem::GetVS(const char *Label)
{
- // lhs = left hand side, rhs = right hand side
- const char *lhs = A;
- const char *rhs = B;
-
- /* Consider epochs. They need special handling because an epoch
- must not be compared against the first element of the real version.
- This works okay when both sides have an epoch but when only one
- does it must compare the missing epoch to 0 */
- for (;lhs != AEnd && *lhs != ':'; lhs++);
- for (;rhs != BEnd && *rhs != ':'; rhs++);
-
- // Parse the epoch out
- unsigned long lhsEpoch = 0;
- unsigned long rhsEpoch = 0;
- if (lhs != AEnd && *lhs == ':')
- lhsEpoch = StrToLong(A,lhs);
- if (rhs != BEnd && *rhs == ':')
- rhsEpoch = StrToLong(B,rhs);
- if (lhsEpoch != rhsEpoch)
- {
- if (lhsEpoch > rhsEpoch)
- return 1;
- 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' */
- lhs = A;
- 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 true
- 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 < !) This is so things like 7.6p2-4 and 7.6-0
- compare higher as well as . and -. I am not sure how
- the dpkg code manages to achive the != '-' test, but it
- is necessary. */
- int lc = *Slhs;
- int rc = *Srhs;
- if (isalpha(lc) == 0 && lc != '-') lc += 256;
- if (isalpha(rc) == 0 && rc != '-') 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;
+ for (unsigned I = 0; I != GlobalListLen; I++)
+ if (strcmp(VSList[I]->Label,Label) == 0)
+ return VSList[I];
+ return 0;
}
/*}}}*/
-// CheckDep - Check a single dependency /*{{{*/
-// ---------------------------------------------------------------------
-/* This simply preforms the version comparison and switch based on
- operator. */
-bool pkgCheckDep(const char *DepVer,const char *PkgVer,int Op)
-{
- if (DepVer == 0)
- return true;
- if (PkgVer == 0)
- return false;
-
- // Perform the actuall comparision.
- int Res = pkgVersionCompare(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;
-}
- /*}}}*/
-
projects / apt.git / blobdiff