1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: version.cc,v 1.3 1998/07/07 04:17:08 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 "pkglib/version.h"
#endif
#include <pkglib/version.h>
#include <pkglib/pkgcache.h>
#include <stdlib.h>
/*}}}*/
// 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 /*{{{*/
// ---------------------------------------------------------------------
/* */
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());
}
/*}}}*/
// VersionCompare - Greater than comparison for versions /*{{{*/
// ---------------------------------------------------------------------
/* */
int pkgVersionCompare(const char *A, const char *AEnd, const char *B,
const char *BEnd)
{
// 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;
}
/*}}}*/
// 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;
}
/*}}}*/
|
