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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: debversion.cc,v 1.4 2002/11/22 06:59:35 doogie 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>
#include <ctype.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);
}
/*}}}*/
#define order(x) ((x) == '~' ? -1 \
: isdigit((x)) ? 0 \
: !(x) ? 0 \
: isalpha((x)) ? (x) \
: (x) + 256)
// 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;
int first_diff = 0;
while ( (lhs != AEnd && !isdigit(*lhs)) || (rhs != BEnd && !isdigit(*rhs)) ) {
int vc= order(*lhs), rc= order(*rhs);
if (vc != rc) return vc - rc;
lhs++; rhs++;
}
while ( *lhs == '0' ) lhs++;
while ( *rhs == '0' ) rhs++;
while (isdigit(*lhs) && isdigit(*rhs)) {
if (!first_diff) first_diff= *lhs - *rhs;
lhs++; rhs++;
}
if (isdigit(*lhs)) return 1;
if (isdigit(*rhs)) return -1;
if (first_diff) return first_diff;
}
// 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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