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winconfig.h
179 lines
6.2 KiB
C
179 lines
6.2 KiB
C
![]() |
/* ===-- os_version_check.c - OS version checking -------------------------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is dual licensed under the MIT and the University of Illinois Open
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* Source Licenses. See LICENSE.TXT for details.
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*
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* ===----------------------------------------------------------------------===
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*
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* This file implements the function __isOSVersionAtLeast, used by
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* Objective-C's @available
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*
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* ===----------------------------------------------------------------------===
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*/
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#ifdef __APPLE__
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#include <CoreFoundation/CoreFoundation.h>
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#include <dispatch/dispatch.h>
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#include <TargetConditionals.h>
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#include <dlfcn.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* These three variables hold the host's OS version. */
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static int32_t GlobalMajor, GlobalMinor, GlobalSubminor;
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static dispatch_once_t DispatchOnceCounter;
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/* Find and parse the SystemVersion.plist file. */
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static void parseSystemVersionPList(void *Unused) {
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(void)Unused;
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/* Load CoreFoundation dynamically */
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const void *NullAllocator = dlsym(RTLD_DEFAULT, "kCFAllocatorNull");
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if (!NullAllocator)
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return;
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const CFAllocatorRef kCFAllocatorNull =
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*(const CFAllocatorRef *)NullAllocator;
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typeof(CFDataCreateWithBytesNoCopy) *CFDataCreateWithBytesNoCopyFunc =
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(typeof(CFDataCreateWithBytesNoCopy) *)dlsym(
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RTLD_DEFAULT, "CFDataCreateWithBytesNoCopy");
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if (!CFDataCreateWithBytesNoCopyFunc)
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return;
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typeof(CFPropertyListCreateWithData) *CFPropertyListCreateWithDataFunc =
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(typeof(CFPropertyListCreateWithData) *)dlsym(
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RTLD_DEFAULT, "CFPropertyListCreateWithData");
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/* CFPropertyListCreateWithData was introduced only in macOS 10.6+, so it
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* will be NULL on earlier OS versions. */
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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typeof(CFPropertyListCreateFromXMLData) *CFPropertyListCreateFromXMLDataFunc =
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(typeof(CFPropertyListCreateFromXMLData) *)dlsym(
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RTLD_DEFAULT, "CFPropertyListCreateFromXMLData");
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#pragma clang diagnostic pop
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/* CFPropertyListCreateFromXMLDataFunc is deprecated in macOS 10.10, so it
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* might be NULL in future OS versions. */
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if (!CFPropertyListCreateWithDataFunc && !CFPropertyListCreateFromXMLDataFunc)
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return;
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typeof(CFStringCreateWithCStringNoCopy) *CFStringCreateWithCStringNoCopyFunc =
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(typeof(CFStringCreateWithCStringNoCopy) *)dlsym(
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RTLD_DEFAULT, "CFStringCreateWithCStringNoCopy");
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if (!CFStringCreateWithCStringNoCopyFunc)
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return;
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typeof(CFDictionaryGetValue) *CFDictionaryGetValueFunc =
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(typeof(CFDictionaryGetValue) *)dlsym(RTLD_DEFAULT,
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"CFDictionaryGetValue");
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if (!CFDictionaryGetValueFunc)
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return;
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typeof(CFGetTypeID) *CFGetTypeIDFunc =
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(typeof(CFGetTypeID) *)dlsym(RTLD_DEFAULT, "CFGetTypeID");
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if (!CFGetTypeIDFunc)
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return;
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typeof(CFStringGetTypeID) *CFStringGetTypeIDFunc =
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(typeof(CFStringGetTypeID) *)dlsym(RTLD_DEFAULT, "CFStringGetTypeID");
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if (!CFStringGetTypeIDFunc)
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return;
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typeof(CFStringGetCString) *CFStringGetCStringFunc =
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(typeof(CFStringGetCString) *)dlsym(RTLD_DEFAULT, "CFStringGetCString");
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if (!CFStringGetCStringFunc)
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return;
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typeof(CFRelease) *CFReleaseFunc =
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(typeof(CFRelease) *)dlsym(RTLD_DEFAULT, "CFRelease");
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if (!CFReleaseFunc)
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return;
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char *PListPath = "/System/Library/CoreServices/SystemVersion.plist";
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#if TARGET_OS_SIMULATOR
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char *PListPathPrefix = getenv("IPHONE_SIMULATOR_ROOT");
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if (!PListPathPrefix)
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return;
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char FullPath[strlen(PListPathPrefix) + strlen(PListPath) + 1];
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strcpy(FullPath, PListPathPrefix);
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strcat(FullPath, PListPath);
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PListPath = FullPath;
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#endif
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FILE *PropertyList = fopen(PListPath, "r");
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if (!PropertyList)
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return;
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/* Dynamically allocated stuff. */
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CFDictionaryRef PListRef = NULL;
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CFDataRef FileContentsRef = NULL;
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UInt8 *PListBuf = NULL;
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fseek(PropertyList, 0, SEEK_END);
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long PListFileSize = ftell(PropertyList);
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if (PListFileSize < 0)
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goto Fail;
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rewind(PropertyList);
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PListBuf = malloc((size_t)PListFileSize);
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if (!PListBuf)
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goto Fail;
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size_t NumRead = fread(PListBuf, 1, (size_t)PListFileSize, PropertyList);
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if (NumRead != (size_t)PListFileSize)
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goto Fail;
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/* Get the file buffer into CF's format. We pass in a null allocator here *
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* because we free PListBuf ourselves */
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FileContentsRef = (*CFDataCreateWithBytesNoCopyFunc)(
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NULL, PListBuf, (CFIndex)NumRead, kCFAllocatorNull);
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if (!FileContentsRef)
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goto Fail;
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if (CFPropertyListCreateWithDataFunc)
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PListRef = (*CFPropertyListCreateWithDataFunc)(
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NULL, FileContentsRef, kCFPropertyListImmutable, NULL, NULL);
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else
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PListRef = (*CFPropertyListCreateFromXMLDataFunc)(
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NULL, FileContentsRef, kCFPropertyListImmutable, NULL);
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if (!PListRef)
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goto Fail;
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CFStringRef ProductVersion = (*CFStringCreateWithCStringNoCopyFunc)(
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NULL, "ProductVersion", kCFStringEncodingASCII, kCFAllocatorNull);
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if (!ProductVersion)
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goto Fail;
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CFTypeRef OpaqueValue = (*CFDictionaryGetValueFunc)(PListRef, ProductVersion);
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(*CFReleaseFunc)(ProductVersion);
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if (!OpaqueValue ||
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(*CFGetTypeIDFunc)(OpaqueValue) != (*CFStringGetTypeIDFunc)())
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goto Fail;
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char VersionStr[32];
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if (!(*CFStringGetCStringFunc)((CFStringRef)OpaqueValue, VersionStr,
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sizeof(VersionStr), kCFStringEncodingUTF8))
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goto Fail;
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sscanf(VersionStr, "%d.%d.%d", &GlobalMajor, &GlobalMinor, &GlobalSubminor);
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Fail:
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if (PListRef)
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(*CFReleaseFunc)(PListRef);
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if (FileContentsRef)
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(*CFReleaseFunc)(FileContentsRef);
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free(PListBuf);
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fclose(PropertyList);
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}
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int32_t __isOSVersionAtLeast(int32_t Major, int32_t Minor, int32_t Subminor) {
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/* Populate the global version variables, if they haven't already. */
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dispatch_once_f(&DispatchOnceCounter, NULL, parseSystemVersionPList);
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if (Major < GlobalMajor) return 1;
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if (Major > GlobalMajor) return 0;
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if (Minor < GlobalMinor) return 1;
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if (Minor > GlobalMinor) return 0;
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return Subminor <= GlobalSubminor;
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}
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#else
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/* Silence an empty translation unit warning. */
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typedef int unused;
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#endif
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