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| //===-- os_version_check.c - OS version checking -------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the function __isOSVersionAtLeast, used by
// Objective-C's @available
//
//===----------------------------------------------------------------------===//
#ifdef __APPLE__
#include <TargetConditionals.h>
#include <dispatch/dispatch.h>
#include <dlfcn.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// These three variables hold the host's OS version.
static int32_t GlobalMajor, GlobalMinor, GlobalSubminor;
static dispatch_once_t DispatchOnceCounter;
// We can't include <CoreFoundation/CoreFoundation.h> directly from here, so
// just forward declare everything that we need from it.
typedef const void *CFDataRef, *CFAllocatorRef, *CFPropertyListRef,
*CFStringRef, *CFDictionaryRef, *CFTypeRef, *CFErrorRef;
#if __LLP64__
typedef unsigned long long CFTypeID;
typedef unsigned long long CFOptionFlags;
typedef signed long long CFIndex;
#else
typedef unsigned long CFTypeID;
typedef unsigned long CFOptionFlags;
typedef signed long CFIndex;
#endif
typedef unsigned char UInt8;
typedef _Bool Boolean;
typedef CFIndex CFPropertyListFormat;
typedef uint32_t CFStringEncoding;
// kCFStringEncodingASCII analog.
#define CF_STRING_ENCODING_ASCII 0x0600
// kCFStringEncodingUTF8 analog.
#define CF_STRING_ENCODING_UTF8 0x08000100
#define CF_PROPERTY_LIST_IMMUTABLE 0
typedef CFDataRef (*CFDataCreateWithBytesNoCopyFuncTy)(CFAllocatorRef,
const UInt8 *, CFIndex,
CFAllocatorRef);
typedef CFPropertyListRef (*CFPropertyListCreateWithDataFuncTy)(
CFAllocatorRef, CFDataRef, CFOptionFlags, CFPropertyListFormat *,
CFErrorRef *);
typedef CFPropertyListRef (*CFPropertyListCreateFromXMLDataFuncTy)(
CFAllocatorRef, CFDataRef, CFOptionFlags, CFStringRef *);
typedef CFStringRef (*CFStringCreateWithCStringNoCopyFuncTy)(CFAllocatorRef,
const char *,
CFStringEncoding,
CFAllocatorRef);
typedef const void *(*CFDictionaryGetValueFuncTy)(CFDictionaryRef,
const void *);
typedef CFTypeID (*CFGetTypeIDFuncTy)(CFTypeRef);
typedef CFTypeID (*CFStringGetTypeIDFuncTy)(void);
typedef Boolean (*CFStringGetCStringFuncTy)(CFStringRef, char *, CFIndex,
CFStringEncoding);
typedef void (*CFReleaseFuncTy)(CFTypeRef);
// Find and parse the SystemVersion.plist file.
static void parseSystemVersionPList(void *Unused) {
(void)Unused;
// Load CoreFoundation dynamically
const void *NullAllocator = dlsym(RTLD_DEFAULT, "kCFAllocatorNull");
if (!NullAllocator)
return;
const CFAllocatorRef AllocatorNull = *(const CFAllocatorRef *)NullAllocator;
CFDataCreateWithBytesNoCopyFuncTy CFDataCreateWithBytesNoCopyFunc =
(CFDataCreateWithBytesNoCopyFuncTy)dlsym(RTLD_DEFAULT,
"CFDataCreateWithBytesNoCopy");
if (!CFDataCreateWithBytesNoCopyFunc)
return;
CFPropertyListCreateWithDataFuncTy CFPropertyListCreateWithDataFunc =
(CFPropertyListCreateWithDataFuncTy)dlsym(RTLD_DEFAULT,
"CFPropertyListCreateWithData");
// CFPropertyListCreateWithData was introduced only in macOS 10.6+, so it
// will be NULL on earlier OS versions.
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
CFPropertyListCreateFromXMLDataFuncTy CFPropertyListCreateFromXMLDataFunc =
(CFPropertyListCreateFromXMLDataFuncTy)dlsym(
RTLD_DEFAULT, "CFPropertyListCreateFromXMLData");
#pragma clang diagnostic pop
// CFPropertyListCreateFromXMLDataFunc is deprecated in macOS 10.10, so it
// might be NULL in future OS versions.
if (!CFPropertyListCreateWithDataFunc && !CFPropertyListCreateFromXMLDataFunc)
return;
CFStringCreateWithCStringNoCopyFuncTy CFStringCreateWithCStringNoCopyFunc =
(CFStringCreateWithCStringNoCopyFuncTy)dlsym(
RTLD_DEFAULT, "CFStringCreateWithCStringNoCopy");
if (!CFStringCreateWithCStringNoCopyFunc)
return;
CFDictionaryGetValueFuncTy CFDictionaryGetValueFunc =
(CFDictionaryGetValueFuncTy)dlsym(RTLD_DEFAULT, "CFDictionaryGetValue");
if (!CFDictionaryGetValueFunc)
return;
CFGetTypeIDFuncTy CFGetTypeIDFunc =
(CFGetTypeIDFuncTy)dlsym(RTLD_DEFAULT, "CFGetTypeID");
if (!CFGetTypeIDFunc)
return;
CFStringGetTypeIDFuncTy CFStringGetTypeIDFunc =
(CFStringGetTypeIDFuncTy)dlsym(RTLD_DEFAULT, "CFStringGetTypeID");
if (!CFStringGetTypeIDFunc)
return;
CFStringGetCStringFuncTy CFStringGetCStringFunc =
(CFStringGetCStringFuncTy)dlsym(RTLD_DEFAULT, "CFStringGetCString");
if (!CFStringGetCStringFunc)
return;
CFReleaseFuncTy CFReleaseFunc =
(CFReleaseFuncTy)dlsym(RTLD_DEFAULT, "CFRelease");
if (!CFReleaseFunc)
return;
char *PListPath = "/System/Library/CoreServices/SystemVersion.plist";
#if TARGET_OS_SIMULATOR
char *PListPathPrefix = getenv("IPHONE_SIMULATOR_ROOT");
if (!PListPathPrefix)
return;
char FullPath[strlen(PListPathPrefix) + strlen(PListPath) + 1];
strcpy(FullPath, PListPathPrefix);
strcat(FullPath, PListPath);
PListPath = FullPath;
#endif
FILE *PropertyList = fopen(PListPath, "r");
if (!PropertyList)
return;
// Dynamically allocated stuff.
CFDictionaryRef PListRef = NULL;
CFDataRef FileContentsRef = NULL;
UInt8 *PListBuf = NULL;
fseek(PropertyList, 0, SEEK_END);
long PListFileSize = ftell(PropertyList);
if (PListFileSize < 0)
goto Fail;
rewind(PropertyList);
PListBuf = malloc((size_t)PListFileSize);
if (!PListBuf)
goto Fail;
size_t NumRead = fread(PListBuf, 1, (size_t)PListFileSize, PropertyList);
if (NumRead != (size_t)PListFileSize)
goto Fail;
// Get the file buffer into CF's format. We pass in a null allocator here *
// because we free PListBuf ourselves
FileContentsRef = (*CFDataCreateWithBytesNoCopyFunc)(
NULL, PListBuf, (CFIndex)NumRead, AllocatorNull);
if (!FileContentsRef)
goto Fail;
if (CFPropertyListCreateWithDataFunc)
PListRef = (*CFPropertyListCreateWithDataFunc)(
NULL, FileContentsRef, CF_PROPERTY_LIST_IMMUTABLE, NULL, NULL);
else
PListRef = (*CFPropertyListCreateFromXMLDataFunc)(
NULL, FileContentsRef, CF_PROPERTY_LIST_IMMUTABLE, NULL);
if (!PListRef)
goto Fail;
CFStringRef ProductVersion = (*CFStringCreateWithCStringNoCopyFunc)(
NULL, "ProductVersion", CF_STRING_ENCODING_ASCII, AllocatorNull);
if (!ProductVersion)
goto Fail;
CFTypeRef OpaqueValue = (*CFDictionaryGetValueFunc)(PListRef, ProductVersion);
(*CFReleaseFunc)(ProductVersion);
if (!OpaqueValue ||
(*CFGetTypeIDFunc)(OpaqueValue) != (*CFStringGetTypeIDFunc)())
goto Fail;
char VersionStr[32];
if (!(*CFStringGetCStringFunc)((CFStringRef)OpaqueValue, VersionStr,
sizeof(VersionStr), CF_STRING_ENCODING_UTF8))
goto Fail;
sscanf(VersionStr, "%d.%d.%d", &GlobalMajor, &GlobalMinor, &GlobalSubminor);
Fail:
if (PListRef)
(*CFReleaseFunc)(PListRef);
if (FileContentsRef)
(*CFReleaseFunc)(FileContentsRef);
free(PListBuf);
fclose(PropertyList);
}
int32_t __isOSVersionAtLeast(int32_t Major, int32_t Minor, int32_t Subminor) {
// Populate the global version variables, if they haven't already.
dispatch_once_f(&DispatchOnceCounter, NULL, parseSystemVersionPList);
if (Major < GlobalMajor)
return 1;
if (Major > GlobalMajor)
return 0;
if (Minor < GlobalMinor)
return 1;
if (Minor > GlobalMinor)
return 0;
return Subminor <= GlobalSubminor;
}
#else
// Silence an empty translation unit warning.
typedef int unused;
#endif
|