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/* ===-- os_version_check.c - OS version checking -------------------------===
*
* The LLVM Compiler Infrastructure
*
* This file is dual licensed under the MIT and the University of Illinois Open
* Source Licenses. See LICENSE.TXT for details.
*
* ===----------------------------------------------------------------------===
*
* This file implements the function __isOSVersionAtLeast, used by
* Objective-C's @available
*
* ===----------------------------------------------------------------------===
*/
#ifdef __APPLE__
#include <CoreFoundation/CoreFoundation.h>
#include <dispatch/dispatch.h>
#include <TargetConditionals.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;
/* Find and parse the SystemVersion.plist file. */
static void parseSystemVersionPList(void *Unused) {
(void)Unused;
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 = CFDataCreateWithBytesNoCopy(
NULL, PListBuf, (CFIndex)NumRead, kCFAllocatorNull);
if (!FileContentsRef)
goto Fail;
if (&CFPropertyListCreateWithData)
PListRef = CFPropertyListCreateWithData(
NULL, FileContentsRef, kCFPropertyListImmutable, NULL, NULL);
else
PListRef = CFPropertyListCreateFromXMLData(NULL, FileContentsRef,
kCFPropertyListImmutable, NULL);
if (!PListRef)
goto Fail;
CFTypeRef OpaqueValue =
CFDictionaryGetValue(PListRef, CFSTR("ProductVersion"));
if (!OpaqueValue || CFGetTypeID(OpaqueValue) != CFStringGetTypeID())
goto Fail;
char VersionStr[32];
if (!CFStringGetCString((CFStringRef)OpaqueValue, VersionStr,
sizeof(VersionStr), kCFStringEncodingUTF8))
goto Fail;
sscanf(VersionStr, "%d.%d.%d", &GlobalMajor, &GlobalMinor, &GlobalSubminor);
Fail:
if (PListRef)
CFRelease(PListRef);
if (FileContentsRef)
CFRelease(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
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