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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: version.cc,v 1.6 1998/11/26 23:29:42 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.
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#ifdef __GNUG__
#pragma implementation "apt-pkg/version.h"
#endif
#include <apt-pkg/version.h>
#include <apt-pkg/pkgcache.h>
#include <stdlib.h>
/*}}}*/
// 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 /*{{{*/
// ---------------------------------------------------------------------
/* */
int pkgVersionCompare(const char *A, const char *B)
{
return pkgVersionCompare(A,A + strlen(A),B,B + strlen(B));
}
int pkgVersionCompare(string A,string B)
{
return pkgVersionCompare(A.begin(),A.end(),B.begin(),B.end());
}
/*}}}*/
// iVersionCompare - Compare versions /*{{{*/
// ---------------------------------------------------------------------
/* This compares a fragment of the version. */
static int iVersionCompare(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;
}
/*}}}*/
// VersionCompare - Comparison for versions /*{{{*/
// ---------------------------------------------------------------------
/* This fragments the version into E:V-R triples and compares each
portion seperately. */
int pkgVersionCompare(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 = iVersionCompare(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--);
// Compare the main version
Res = iVersionCompare(lhs,dlhs,rhs,drhs);
if (Res != 0)
return Res;
// Skip the -
if (dlhs != lhs)
dlhs++;
if (drhs != rhs)
drhs++;
return iVersionCompare(dlhs,AEnd,drhs,BEnd);
}
/*}}}*/
// 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;
}
/*}}}*/
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