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450 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsVersionComparator.h"
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#if defined(_WIN32) && !defined(UPDATER_NO_STRING_GLUE_STL)
#include <wchar.h>
#include "Char16.h"
#endif
#ifdef _WIN32
// from Mozilla's nsAlgorithm.h
template <class T>
inline const T&
XPCOM_MIN(const T& aA, const T& aB)
{
return aB < aA ? aB : aA;
}
#endif
struct VersionPart
{
int32_t numA;
const char* strB; // NOT null-terminated, can be a null pointer
uint32_t strBlen;
int32_t numC;
char* extraD; // null-terminated
};
#ifdef _WIN32
struct VersionPartW
{
int32_t numA;
wchar_t* strB; // NOT null-terminated, can be a null pointer
uint32_t strBlen;
int32_t numC;
wchar_t* extraD; // null-terminated
};
#endif
/**
* Parse a version part into a number and "extra text".
*
* @returns A pointer to the next versionpart, or null if none.
*/
static char*
ParseVP(char* aPart, VersionPart& aResult)
{
char* dot;
aResult.numA = 0;
aResult.strB = nullptr;
aResult.strBlen = 0;
aResult.numC = 0;
aResult.extraD = nullptr;
if (!aPart)
{
return aPart;
}
dot = strchr(aPart, '.');
if (dot)
{
*dot = '\0';
}
if (aPart[0] == '*' && aPart[1] == '\0')
{
aResult.numA = INT32_MAX;
aResult.strB = "";
}
else
{
aResult.numA = strtol(aPart, const_cast<char**>(&aResult.strB), 10);
}
if (!*aResult.strB)
{
aResult.strB = nullptr;
aResult.strBlen = 0;
}
else
{
if (aResult.strB[0] == '+')
{
static const char kPre[] = "pre";
++aResult.numA;
aResult.strB = kPre;
aResult.strBlen = sizeof(kPre) - 1;
}
else
{
const char* numstart = strpbrk(aResult.strB, "0123456789+-");
if (!numstart)
{
aResult.strBlen = strlen(aResult.strB);
}
else
{
aResult.strBlen = numstart - aResult.strB;
aResult.numC = strtol(numstart, &aResult.extraD, 10);
if (!*aResult.extraD)
{
aResult.extraD = nullptr;
}
}
}
}
if (dot)
{
++dot;
if (!*dot)
{
dot = nullptr;
}
}
return dot;
}
/**
* Parse a version part into a number and "extra text".
*
* @returns A pointer to the next versionpart, or null if none.
*/
#ifdef _WIN32
static wchar_t*
ParseVP(wchar_t* aPart, VersionPartW& aResult)
{
wchar_t* dot;
aResult.numA = 0;
aResult.strB = nullptr;
aResult.strBlen = 0;
aResult.numC = 0;
aResult.extraD = nullptr;
if (!aPart)
{
return aPart;
}
dot = wcschr(aPart, '.');
if (dot)
{
*dot = '\0';
}
if (aPart[0] == '*' && aPart[1] == '\0')
{
aResult.numA = INT32_MAX;
aResult.strB = L"";
}
else
{
aResult.numA = wcstol(aPart, const_cast<wchar_t**>(&aResult.strB), 10);
}
if (!*aResult.strB)
{
aResult.strB = nullptr;
aResult.strBlen = 0;
}
else
{
if (aResult.strB[0] == '+')
{
static wchar_t kPre[] = L"pre";
++aResult.numA;
aResult.strB = kPre;
aResult.strBlen = sizeof(kPre) - 1;
}
else
{
const wchar_t* numstart = wcspbrk(aResult.strB, L"0123456789+-");
if (!numstart)
{
aResult.strBlen = wcslen(aResult.strB);
}
else
{
aResult.strBlen = numstart - aResult.strB;
aResult.numC = wcstol(numstart, &aResult.extraD, 10);
if (!*aResult.extraD)
{
aResult.extraD = nullptr;
}
}
}
}
if (dot)
{
++dot;
if (!*dot)
{
dot = nullptr;
}
}
return dot;
}
#endif
// compare two null-terminated strings, which may be null pointers
static int32_t
ns_strcmp(const char* aStr1, const char* aStr2)
{
// any string is *before* no string
if (!aStr1)
{
return aStr2 != 0;
}
if (!aStr2)
{
return -1;
}
return strcmp(aStr1, aStr2);
}
// compare two length-specified string, which may be null pointers
static int32_t
ns_strnncmp(const char* aStr1, uint32_t aLen1,
const char* aStr2, uint32_t aLen2)
{
// any string is *before* no string
if (!aStr1)
{
return aStr2 != 0;
}
if (!aStr2)
{
return -1;
}
for (; aLen1 && aLen2; --aLen1, --aLen2, ++aStr1, ++aStr2)
{
if (*aStr1 < *aStr2)
{
return -1;
}
if (*aStr1 > *aStr2)
{
return 1;
}
}
if (aLen1 == 0)
{
return aLen2 == 0 ? 0 : -1;
}
return 1;
}
// compare two int32_t
static int32_t
ns_cmp(int32_t aNum1, int32_t aNum2)
{
if (aNum1 < aNum2)
{
return -1;
}
return aNum1 != aNum2;
}
/**
* Compares two VersionParts
*/
static int32_t
CompareVP(VersionPart& aVer1, VersionPart& aVer2)<--- Parameter 'aVer1' can be declared with const<--- Parameter 'aVer2' can be declared with const
{
int32_t r = ns_cmp(aVer1.numA, aVer2.numA);
if (r)
{
return r;
}
r = ns_strnncmp(aVer1.strB, aVer1.strBlen, aVer2.strB, aVer2.strBlen);
if (r)
{
return r;
}
r = ns_cmp(aVer1.numC, aVer2.numC);
if (r)
{
return r;
}
return ns_strcmp(aVer1.extraD, aVer2.extraD);
}
/**
* Compares two VersionParts
*/
#ifdef _WIN32
static int32_t
CompareVP(VersionPartW& aVer1, VersionPartW& aVer2)<--- Parameter 'aVer1' can be declared with const<--- Parameter 'aVer2' can be declared with const
{
int32_t r = ns_cmp(aVer1.numA, aVer2.numA);
if (r)
{
return r;
}
r = wcsncmp(aVer1.strB, aVer2.strB, XPCOM_MIN(aVer1.strBlen, aVer2.strBlen));
if (r)
{
return r;
}
r = ns_cmp(aVer1.numC, aVer2.numC);
if (r)
{
return r;
}
if (!aVer1.extraD)
{
return aVer2.extraD != 0;
}
if (!aVer2.extraD)
{
return -1;
}
return wcscmp(aVer1.extraD, aVer2.extraD);
}
#endif
namespace mozilla {
#ifdef _WIN32
int32_t
CompareVersions(const wchar_t* aStrA, const wchar_t* aStrB)
{
wchar_t* A2 = wcsdup(aStrA);
if (!A2)
{
return 1;
}
wchar_t* B2 = wcsdup(aStrB);
if (!B2)
{
free(A2);
return 1;
}
int32_t result;
wchar_t* a = A2;
wchar_t* b = B2;
do
{
VersionPartW va, vb;
a = ParseVP(a, va);
b = ParseVP(b, vb);
result = CompareVP(va, vb);
if (result)
{
break;
}
}
while (a || b);
free(A2);
free(B2);
return result;
}
#endif
int32_t
CompareVersions(const char* aStrA, const char* aStrB)
{
char* A2 = strdup(aStrA);
if (!A2)
{
return 1;
}
char* B2 = strdup(aStrB);
if (!B2)
{
free(A2);
return 1;
}
int32_t result;
char* a = A2;
char* b = B2;
do
{
VersionPart va, vb;
a = ParseVP(a, va);
b = ParseVP(b, vb);
result = CompareVP(va, vb);
if (result)
{
break;
}
}
while (a || b);
free(A2);
free(B2);
return result;
}
} // namespace mozilla
|