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zstd/programs/util.c
Nick Terrell f6d00c059f [util] Fix readLineFromFile on Cygwin
2020-01-13 14:37:22 -08:00

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/*
* Copyright (c) 2016-present, Przemyslaw Skibinski, Yann Collet, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
#if defined (__cplusplus)
extern "C" {
#endif
/*-****************************************
* Dependencies
******************************************/
#include "util.h" /* note : ensure that platform.h is included first ! */
#include <stdlib.h> /* malloc, realloc, free */
#include <stdio.h> /* fprintf */
#include <time.h> /* clock_t, clock, CLOCKS_PER_SEC, nanosleep */
#include <errno.h>
#include <assert.h>
#if defined(_WIN32)
# include <sys/utime.h> /* utime */
# include <io.h> /* _chmod */
#else
# include <unistd.h> /* chown, stat */
# if PLATFORM_POSIX_VERSION < 200809L
# include <utime.h> /* utime */
# else
# include <fcntl.h> /* AT_FDCWD */
# include <sys/stat.h> /* utimensat */
# endif
#endif
#if defined(_MSC_VER) || defined(__MINGW32__) || defined (__MSVCRT__)
#include <direct.h> /* needed for _mkdir in windows */
#endif
#if defined(__linux__) || (PLATFORM_POSIX_VERSION >= 200112L) /* opendir, readdir require POSIX.1-2001 */
# include <dirent.h> /* opendir, readdir */
# include <string.h> /* strerror, memcpy */
#endif /* #ifdef _WIN32 */
/*-****************************************
* Internal Macros
******************************************/
/* CONTROL is almost like an assert(), but is never disabled.
* It's designed for failures that may happen rarely,
* but we don't want to maintain a specific error code path for them,
* such as a malloc() returning NULL for example.
* Since it's always active, this macro can trigger side effects.
*/
#define CONTROL(c) { \
if (!(c)) { \
UTIL_DISPLAYLEVEL(1, "Error : %s, %i : %s", \
__FILE__, __LINE__, #c); \
exit(1); \
} }
/* console log */
#define UTIL_DISPLAY(...) fprintf(stderr, __VA_ARGS__)
#define UTIL_DISPLAYLEVEL(l, ...) { if (g_utilDisplayLevel>=l) { UTIL_DISPLAY(__VA_ARGS__); } }
/* A modified version of realloc().
* If UTIL_realloc() fails the original block is freed.
*/
UTIL_STATIC void* UTIL_realloc(void *ptr, size_t size)
{
void *newptr = realloc(ptr, size);
if (newptr) return newptr;
free(ptr);
return NULL;
}
#if defined(_MSC_VER)
#define chmod _chmod
#endif
/*-****************************************
* Console log
******************************************/
int g_utilDisplayLevel;
/*-*************************************
* Constants
***************************************/
#define LIST_SIZE_INCREASE (8*1024)
#define MAX_FILE_OF_FILE_NAMES_SIZE (1<<20)*50
/*-*************************************
* Functions
***************************************/
int UTIL_fileExist(const char* filename)
{
stat_t statbuf;
#if defined(_MSC_VER)
int const stat_error = _stat64(filename, &statbuf);
#else
int const stat_error = stat(filename, &statbuf);
#endif
return !stat_error;
}
int UTIL_isRegularFile(const char* infilename)
{
stat_t statbuf;
return UTIL_getFileStat(infilename, &statbuf); /* Only need to know whether it is a regular file */
}
int UTIL_getFileStat(const char* infilename, stat_t *statbuf)
{
int r;
#if defined(_MSC_VER)
r = _stat64(infilename, statbuf);
if (r || !(statbuf->st_mode & S_IFREG)) return 0; /* No good... */
#else
r = stat(infilename, statbuf);
if (r || !S_ISREG(statbuf->st_mode)) return 0; /* No good... */
#endif
return 1;
}
/* like chmod, but avoid changing permission of /dev/null */
int UTIL_chmod(char const* filename, mode_t permissions)
{
if (!strcmp(filename, "/dev/null")) return 0; /* pretend success, but don't change anything */
return chmod(filename, permissions);
}
int UTIL_setFileStat(const char *filename, stat_t *statbuf)
{
int res = 0;
if (!UTIL_isRegularFile(filename))
return -1;
/* set access and modification times */
/* We check that st_mtime is a macro here in order to give us confidence
* that struct stat has a struct timespec st_mtim member. We need this
* check because there are some platforms that claim to be POSIX 2008
* compliant but which do not have st_mtim... */
#if (PLATFORM_POSIX_VERSION >= 200809L) && defined(st_mtime)
{
/* (atime, mtime) */
struct timespec timebuf[2] = { {0, UTIME_NOW} };
timebuf[1] = statbuf->st_mtim;
res += utimensat(AT_FDCWD, filename, timebuf, 0);
}
#else
{
struct utimbuf timebuf;
timebuf.actime = time(NULL);
timebuf.modtime = statbuf->st_mtime;
res += utime(filename, &timebuf);
}
#endif
#if !defined(_WIN32)
res += chown(filename, statbuf->st_uid, statbuf->st_gid); /* Copy ownership */
#endif
res += UTIL_chmod(filename, statbuf->st_mode & 07777); /* Copy file permissions */
errno = 0;
return -res; /* number of errors is returned */
}
int UTIL_isDirectory(const char* infilename)
{
stat_t statbuf;
#if defined(_MSC_VER)
int const r = _stat64(infilename, &statbuf);
if (!r && (statbuf.st_mode & _S_IFDIR)) return 1;
#else
int const r = stat(infilename, &statbuf);
if (!r && S_ISDIR(statbuf.st_mode)) return 1;
#endif
return 0;
}
int UTIL_compareStr(const void *p1, const void *p2) {
return strcmp(* (char * const *) p1, * (char * const *) p2);
}
int UTIL_isSameFile(const char* fName1, const char* fName2)
{
assert(fName1 != NULL); assert(fName2 != NULL);
#if defined(_MSC_VER) || defined(_WIN32)
/* note : Visual does not support file identification by inode.
* inode does not work on Windows, even with a posix layer, like msys2.
* The following work-around is limited to detecting exact name repetition only,
* aka `filename` is considered different from `subdir/../filename` */
return !strcmp(fName1, fName2);
#else
{ stat_t file1Stat;
stat_t file2Stat;
return UTIL_getFileStat(fName1, &file1Stat)
&& UTIL_getFileStat(fName2, &file2Stat)
&& (file1Stat.st_dev == file2Stat.st_dev)
&& (file1Stat.st_ino == file2Stat.st_ino);
}
#endif
}
/* UTIL_isFIFO : distinguish named pipes */
int UTIL_isFIFO(const char* infilename)
{
/* macro guards, as defined in : https://linux.die.net/man/2/lstat */
#if PLATFORM_POSIX_VERSION >= 200112L
stat_t statbuf;
int const r = UTIL_getFileStat(infilename, &statbuf);
if (!r && S_ISFIFO(statbuf.st_mode)) return 1;
#endif
(void)infilename;
return 0;
}
int UTIL_isLink(const char* infilename)
{
/* macro guards, as defined in : https://linux.die.net/man/2/lstat */
#if PLATFORM_POSIX_VERSION >= 200112L
stat_t statbuf;
int const r = lstat(infilename, &statbuf);
if (!r && S_ISLNK(statbuf.st_mode)) return 1;
#endif
(void)infilename;
return 0;
}
U64 UTIL_getFileSize(const char* infilename)
{
if (!UTIL_isRegularFile(infilename)) return UTIL_FILESIZE_UNKNOWN;
{ int r;
#if defined(_MSC_VER)
struct __stat64 statbuf;
r = _stat64(infilename, &statbuf);
if (r || !(statbuf.st_mode & S_IFREG)) return UTIL_FILESIZE_UNKNOWN;
#elif defined(__MINGW32__) && defined (__MSVCRT__)
struct _stati64 statbuf;
r = _stati64(infilename, &statbuf);
if (r || !(statbuf.st_mode & S_IFREG)) return UTIL_FILESIZE_UNKNOWN;
#else
struct stat statbuf;
r = stat(infilename, &statbuf);
if (r || !S_ISREG(statbuf.st_mode)) return UTIL_FILESIZE_UNKNOWN;
#endif
return (U64)statbuf.st_size;
}
}
U64 UTIL_getTotalFileSize(const char* const * fileNamesTable, unsigned nbFiles)
{
U64 total = 0;
unsigned n;
for (n=0; n<nbFiles; n++) {
U64 const size = UTIL_getFileSize(fileNamesTable[n]);
if (size == UTIL_FILESIZE_UNKNOWN) return UTIL_FILESIZE_UNKNOWN;
total += size;
}
return total;
}
/* condition : @file must be valid, and not have reached its end.
* @return : length of line written into @buf, ended with `\0` instead of '\n',
* or 0, if there is no new line */
static size_t readLineFromFile(char* buf, size_t len, FILE* file)
{
assert(!feof(file));
/* Work around Cygwin problem when len == 1 it returns NULL. */
if (len <= 1) return 0;
CONTROL( fgets(buf, (int) len, file) );
{ size_t linelen = strlen(buf);
if (strlen(buf)==0) return 0;
if (buf[linelen-1] == '\n') linelen--;
buf[linelen] = '\0';
return linelen+1;
}
}
/* Conditions :
* size of @inputFileName file must be < @dstCapacity
* @dst must be initialized
* @return : nb of lines
* or -1 if there's an error
*/
static int
readLinesFromFile(void* dst, size_t dstCapacity,
const char* inputFileName)
{
int nbFiles = 0;
size_t pos = 0;
char* const buf = (char*)dst;
FILE* const inputFile = fopen(inputFileName, "r");
assert(dst != NULL);
if(!inputFile) {
if (g_utilDisplayLevel >= 1) perror("zstd:util:readLinesFromFile");
return -1;
}
while ( !feof(inputFile) ) {
size_t const lineLength = readLineFromFile(buf+pos, dstCapacity-pos, inputFile);
if (lineLength == 0) break;
assert(pos + lineLength < dstCapacity);
pos += lineLength;
++nbFiles;
}
CONTROL( fclose(inputFile) == 0 );
return nbFiles;
}
/*Note: buf is not freed in case function successfully created table because filesTable->fileNames[0] = buf*/
FileNamesTable*
UTIL_createFileNamesTable_fromFileName(const char* inputFileName)
{
size_t nbFiles = 0;
char* buf;
size_t bufSize;
size_t pos = 0;
if (!UTIL_fileExist(inputFileName) || !UTIL_isRegularFile(inputFileName))
return NULL;
{ U64 const inputFileSize = UTIL_getFileSize(inputFileName);
if(inputFileSize > MAX_FILE_OF_FILE_NAMES_SIZE)
return NULL;
bufSize = (size_t)(inputFileSize + 1); /* (+1) to add '\0' at the end of last filename */
}
buf = (char*) malloc(bufSize);
CONTROL( buf != NULL );
{ int const ret_nbFiles = readLinesFromFile(buf, bufSize, inputFileName);
if (ret_nbFiles <= 0) {
free(buf);
return NULL;
}
nbFiles = (size_t)ret_nbFiles;
}
{ const char** filenamesTable = (const char**) malloc(nbFiles * sizeof(*filenamesTable));
CONTROL(filenamesTable != NULL);
{ size_t fnb;
for (fnb = 0, pos = 0; fnb < nbFiles; fnb++) {
filenamesTable[fnb] = buf+pos;
pos += strlen(buf+pos)+1; /* +1 for the finishing `\0` */
} }
assert(pos <= bufSize);
return UTIL_assembleFileNamesTable(filenamesTable, nbFiles, buf);
}
}
static FileNamesTable*
UTIL_assembleFileNamesTable2(const char** filenames, size_t tableSize, size_t tableCapacity, char* buf)
{
FileNamesTable* const table = (FileNamesTable*) malloc(sizeof(*table));
CONTROL(table != NULL);
table->fileNames = filenames;
table->buf = buf;
table->tableSize = tableSize;
table->tableCapacity = tableCapacity;
return table;
}
FileNamesTable*
UTIL_assembleFileNamesTable(const char** filenames, size_t tableSize, char* buf)
{
return UTIL_assembleFileNamesTable2(filenames, tableSize, tableSize, buf);
}
void UTIL_freeFileNamesTable(FileNamesTable* table)
{
if (table==NULL) return;
free((void*)table->fileNames);
free(table->buf);
free(table);
}
FileNamesTable* UTIL_allocateFileNamesTable(size_t tableSize)
{
const char** const fnTable = (const char**)malloc(tableSize * sizeof(*fnTable));
FileNamesTable* fnt;
if (fnTable==NULL) return NULL;
fnt = UTIL_assembleFileNamesTable(fnTable, tableSize, NULL);
fnt->tableSize = 0; /* the table is empty */
return fnt;
}
void UTIL_refFilename(FileNamesTable* fnt, const char* filename)
{
assert(fnt->tableSize < fnt->tableCapacity);
fnt->fileNames[fnt->tableSize] = filename;
fnt->tableSize++;
}
static size_t getTotalTableSize(FileNamesTable* table)
{
size_t fnb = 0, totalSize = 0;
for(fnb = 0 ; fnb < table->tableSize && table->fileNames[fnb] ; ++fnb) {
totalSize += strlen(table->fileNames[fnb]) + 1; /* +1 to add '\0' at the end of each fileName */
}
return totalSize;
}
FileNamesTable*
UTIL_mergeFileNamesTable(FileNamesTable* table1, FileNamesTable* table2)
{
unsigned newTableIdx = 0;
size_t pos = 0;
size_t newTotalTableSize;
char* buf;
FileNamesTable* const newTable = UTIL_assembleFileNamesTable(NULL, 0, NULL);
CONTROL( newTable != NULL );
newTotalTableSize = getTotalTableSize(table1) + getTotalTableSize(table2);
buf = (char*) calloc(newTotalTableSize, sizeof(*buf));
CONTROL ( buf != NULL );
newTable->buf = buf;
newTable->tableSize = table1->tableSize + table2->tableSize;
newTable->fileNames = (const char **) calloc(newTable->tableSize, sizeof(*(newTable->fileNames)));
CONTROL ( newTable->fileNames != NULL );
{ unsigned idx1;
for( idx1=0 ; (idx1 < table1->tableSize) && table1->fileNames[idx1] && (pos < newTotalTableSize); ++idx1, ++newTableIdx) {
size_t const curLen = strlen(table1->fileNames[idx1]);
memcpy(buf+pos, table1->fileNames[idx1], curLen);
assert(newTableIdx <= newTable->tableSize);
newTable->fileNames[newTableIdx] = buf+pos;
pos += curLen+1;
} }
{ unsigned idx2;
for( idx2=0 ; (idx2 < table2->tableSize) && table2->fileNames[idx2] && (pos < newTotalTableSize) ; ++idx2, ++newTableIdx) {
size_t const curLen = strlen(table2->fileNames[idx2]);
memcpy(buf+pos, table2->fileNames[idx2], curLen);
assert(newTableIdx <= newTable->tableSize);
newTable->fileNames[newTableIdx] = buf+pos;
pos += curLen+1;
} }
assert(pos <= newTotalTableSize);
newTable->tableSize = newTableIdx;
UTIL_freeFileNamesTable(table1);
UTIL_freeFileNamesTable(table2);
return newTable;
}
#ifdef _WIN32
static int UTIL_prepareFileList(const char* dirName,
char** bufStart, size_t* pos,
char** bufEnd, int followLinks)
{
char* path;
size_t dirLength, pathLength;
int nbFiles = 0;
WIN32_FIND_DATAA cFile;
HANDLE hFile;
dirLength = strlen(dirName);
path = (char*) malloc(dirLength + 3);
if (!path) return 0;
memcpy(path, dirName, dirLength);
path[dirLength] = '\\';
path[dirLength+1] = '*';
path[dirLength+2] = 0;
hFile=FindFirstFileA(path, &cFile);
if (hFile == INVALID_HANDLE_VALUE) {
UTIL_DISPLAYLEVEL(1, "Cannot open directory '%s'\n", dirName);
return 0;
}
free(path);
do {
size_t const fnameLength = strlen(cFile.cFileName);
path = (char*) malloc(dirLength + fnameLength + 2);
if (!path) { FindClose(hFile); return 0; }
memcpy(path, dirName, dirLength);
path[dirLength] = '\\';
memcpy(path+dirLength+1, cFile.cFileName, fnameLength);
pathLength = dirLength+1+fnameLength;
path[pathLength] = 0;
if (cFile.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
if ( strcmp (cFile.cFileName, "..") == 0
|| strcmp (cFile.cFileName, ".") == 0 )
continue;
/* Recursively call "UTIL_prepareFileList" with the new path. */
nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks);
if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
} else if ( (cFile.dwFileAttributes & FILE_ATTRIBUTE_NORMAL)
|| (cFile.dwFileAttributes & FILE_ATTRIBUTE_ARCHIVE)
|| (cFile.dwFileAttributes & FILE_ATTRIBUTE_COMPRESSED) ) {
if (*bufStart + *pos + pathLength >= *bufEnd) {
ptrdiff_t const newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
*bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
*bufEnd = *bufStart + newListSize;
}
if (*bufStart + *pos + pathLength < *bufEnd) {
memcpy(*bufStart + *pos, path, pathLength+1 /* include final \0 */);
*pos += pathLength + 1;
nbFiles++;
} }
free(path);
} while (FindNextFileA(hFile, &cFile));
FindClose(hFile);
return nbFiles;
}
#elif defined(__linux__) || (PLATFORM_POSIX_VERSION >= 200112L) /* opendir, readdir require POSIX.1-2001 */
static int UTIL_prepareFileList(const char *dirName,
char** bufStart, size_t* pos,
char** bufEnd, int followLinks)
{
DIR* dir;
struct dirent * entry;
size_t dirLength;
int nbFiles = 0;
if (!(dir = opendir(dirName))) {
UTIL_DISPLAYLEVEL(1, "Cannot open directory '%s': %s\n", dirName, strerror(errno));
return 0;
}
dirLength = strlen(dirName);
errno = 0;
while ((entry = readdir(dir)) != NULL) {
char* path;
size_t fnameLength, pathLength;
if (strcmp (entry->d_name, "..") == 0 ||
strcmp (entry->d_name, ".") == 0) continue;
fnameLength = strlen(entry->d_name);
path = (char*) malloc(dirLength + fnameLength + 2);
if (!path) { closedir(dir); return 0; }
memcpy(path, dirName, dirLength);
path[dirLength] = '/';
memcpy(path+dirLength+1, entry->d_name, fnameLength);
pathLength = dirLength+1+fnameLength;
path[pathLength] = 0;
if (!followLinks && UTIL_isLink(path)) {
UTIL_DISPLAYLEVEL(2, "Warning : %s is a symbolic link, ignoring\n", path);
free(path);
continue;
}
if (UTIL_isDirectory(path)) {
nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks); /* Recursively call "UTIL_prepareFileList" with the new path. */
if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
} else {
if (*bufStart + *pos + pathLength >= *bufEnd) {
ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
assert(newListSize >= 0);
*bufStart = (char*)UTIL_realloc(*bufStart, (size_t)newListSize);
*bufEnd = *bufStart + newListSize;
if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
}
if (*bufStart + *pos + pathLength < *bufEnd) {
memcpy(*bufStart + *pos, path, pathLength + 1); /* with final \0 */
*pos += pathLength + 1;
nbFiles++;
} }
free(path);
errno = 0; /* clear errno after UTIL_isDirectory, UTIL_prepareFileList */
}
if (errno != 0) {
UTIL_DISPLAYLEVEL(1, "readdir(%s) error: %s \n", dirName, strerror(errno));
free(*bufStart);
*bufStart = NULL;
}
closedir(dir);
return nbFiles;
}
#else
static int UTIL_prepareFileList(const char *dirName,
char** bufStart, size_t* pos,
char** bufEnd, int followLinks)
{
(void)bufStart; (void)bufEnd; (void)pos; (void)followLinks;
UTIL_DISPLAYLEVEL(1, "Directory %s ignored (compiled without _WIN32 or _POSIX_C_SOURCE) \n", dirName);
return 0;
}
#endif /* #ifdef _WIN32 */
int UTIL_isCompressedFile(const char *inputName, const char *extensionList[])
{
const char* ext = UTIL_getFileExtension(inputName);
while(*extensionList!=NULL)
{
const int isCompressedExtension = strcmp(ext,*extensionList);
if(isCompressedExtension==0)
return 1;
++extensionList;
}
return 0;
}
/*Utility function to get file extension from file */
const char* UTIL_getFileExtension(const char* infilename)
{
const char* extension = strrchr(infilename, '.');
if(!extension || extension==infilename) return "";
return extension;
}
FileNamesTable*
UTIL_createExpandedFNT(const char** inputNames, size_t nbIfns, int followLinks)
{
unsigned nbFiles;
char* buf = (char*)malloc(LIST_SIZE_INCREASE);
char* bufend = buf + LIST_SIZE_INCREASE;
if (!buf) return NULL;
{ size_t ifnNb, pos;
for (ifnNb=0, pos=0, nbFiles=0; ifnNb<nbIfns; ifnNb++) {
if (!UTIL_isDirectory(inputNames[ifnNb])) {
size_t const len = strlen(inputNames[ifnNb]);
if (buf + pos + len >= bufend) {
ptrdiff_t newListSize = (bufend - buf) + LIST_SIZE_INCREASE;
assert(newListSize >= 0);
buf = (char*)UTIL_realloc(buf, (size_t)newListSize);
if (!buf) return NULL;
bufend = buf + newListSize;
}
if (buf + pos + len < bufend) {
memcpy(buf+pos, inputNames[ifnNb], len+1); /* including final \0 */
pos += len + 1;
nbFiles++;
}
} else {
nbFiles += (unsigned)UTIL_prepareFileList(inputNames[ifnNb], &buf, &pos, &bufend, followLinks);
if (buf == NULL) return NULL;
} } }
/* note : even if nbFiles==0, function returns a valid, though empty, FileNamesTable* object */
{ size_t ifnNb, pos;
size_t const fntCapacity = nbFiles + 1; /* minimum 1, allows adding one reference, typically stdin */
const char** const fileNamesTable = (const char**)malloc(fntCapacity * sizeof(*fileNamesTable));
if (!fileNamesTable) { free(buf); return NULL; }
for (ifnNb = 0, pos = 0; ifnNb < nbFiles; ifnNb++) {
fileNamesTable[ifnNb] = buf + pos;
if (buf + pos > bufend) { free(buf); free((void*)fileNamesTable); return NULL; }
pos += strlen(fileNamesTable[ifnNb]) + 1;
}
return UTIL_assembleFileNamesTable2(fileNamesTable, nbFiles, fntCapacity, buf);
}
}
void UTIL_expandFNT(FileNamesTable** fnt, int followLinks)
{
FileNamesTable* const newFNT = UTIL_createExpandedFNT((*fnt)->fileNames, (*fnt)->tableSize, followLinks);
CONTROL(newFNT != NULL);
UTIL_freeFileNamesTable(*fnt);
*fnt = newFNT;
}
FileNamesTable* UTIL_createFNT_fromROTable(const char** filenames, size_t nbFilenames)
{
size_t const sizeof_FNTable = nbFilenames * sizeof(*filenames);
const char** const newFNTable = (const char**)malloc(sizeof_FNTable);
if (newFNTable==NULL) return NULL;
memcpy((void*)newFNTable, filenames, sizeof_FNTable); /* void* : mitigate a Visual compiler bug or limitation */
return UTIL_assembleFileNamesTable(newFNTable, nbFilenames, NULL);
}
/*-****************************************
* count the number of physical cores
******************************************/
#if defined(_WIN32) || defined(WIN32)
#include <windows.h>
typedef BOOL(WINAPI* LPFN_GLPI)(PSYSTEM_LOGICAL_PROCESSOR_INFORMATION, PDWORD);
int UTIL_countPhysicalCores(void)
{
static int numPhysicalCores = 0;
if (numPhysicalCores != 0) return numPhysicalCores;
{ LPFN_GLPI glpi;
BOOL done = FALSE;
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL;
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION ptr = NULL;
DWORD returnLength = 0;
size_t byteOffset = 0;
#if defined(_MSC_VER)
/* Visual Studio does not like the following cast */
# pragma warning( disable : 4054 ) /* conversion from function ptr to data ptr */
# pragma warning( disable : 4055 ) /* conversion from data ptr to function ptr */
#endif
glpi = (LPFN_GLPI)(void*)GetProcAddress(GetModuleHandle(TEXT("kernel32")),
"GetLogicalProcessorInformation");
if (glpi == NULL) {
goto failed;
}
while(!done) {
DWORD rc = glpi(buffer, &returnLength);
if (FALSE == rc) {
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
if (buffer)
free(buffer);
buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)malloc(returnLength);
if (buffer == NULL) {
perror("zstd");
exit(1);
}
} else {
/* some other error */
goto failed;
}
} else {
done = TRUE;
} }
ptr = buffer;
while (byteOffset + sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) <= returnLength) {
if (ptr->Relationship == RelationProcessorCore) {
numPhysicalCores++;
}
ptr++;
byteOffset += sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
}
free(buffer);
return numPhysicalCores;
}
failed:
/* try to fall back on GetSystemInfo */
{ SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
numPhysicalCores = sysinfo.dwNumberOfProcessors;
if (numPhysicalCores == 0) numPhysicalCores = 1; /* just in case */
}
return numPhysicalCores;
}
#elif defined(__APPLE__)
#include <sys/sysctl.h>
/* Use apple-provided syscall
* see: man 3 sysctl */
int UTIL_countPhysicalCores(void)
{
static S32 numPhysicalCores = 0; /* apple specifies int32_t */
if (numPhysicalCores != 0) return numPhysicalCores;
{ size_t size = sizeof(S32);
int const ret = sysctlbyname("hw.physicalcpu", &numPhysicalCores, &size, NULL, 0);
if (ret != 0) {
if (errno == ENOENT) {
/* entry not present, fall back on 1 */
numPhysicalCores = 1;
} else {
perror("zstd: can't get number of physical cpus");
exit(1);
}
}
return numPhysicalCores;
}
}
#elif defined(__linux__)
/* parse /proc/cpuinfo
* siblings / cpu cores should give hyperthreading ratio
* otherwise fall back on sysconf */
int UTIL_countPhysicalCores(void)
{
static int numPhysicalCores = 0;
if (numPhysicalCores != 0) return numPhysicalCores;
numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
if (numPhysicalCores == -1) {
/* value not queryable, fall back on 1 */
return numPhysicalCores = 1;
}
/* try to determine if there's hyperthreading */
{ FILE* const cpuinfo = fopen("/proc/cpuinfo", "r");
#define BUF_SIZE 80
char buff[BUF_SIZE];
int siblings = 0;
int cpu_cores = 0;
int ratio = 1;
if (cpuinfo == NULL) {
/* fall back on the sysconf value */
return numPhysicalCores;
}
/* assume the cpu cores/siblings values will be constant across all
* present processors */
while (!feof(cpuinfo)) {
if (fgets(buff, BUF_SIZE, cpuinfo) != NULL) {
if (strncmp(buff, "siblings", 8) == 0) {
const char* const sep = strchr(buff, ':');
if (sep == NULL || *sep == '\0') {
/* formatting was broken? */
goto failed;
}
siblings = atoi(sep + 1);
}
if (strncmp(buff, "cpu cores", 9) == 0) {
const char* const sep = strchr(buff, ':');
if (sep == NULL || *sep == '\0') {
/* formatting was broken? */
goto failed;
}
cpu_cores = atoi(sep + 1);
}
} else if (ferror(cpuinfo)) {
/* fall back on the sysconf value */
goto failed;
} }
if (siblings && cpu_cores) {
ratio = siblings / cpu_cores;
}
failed:
fclose(cpuinfo);
return numPhysicalCores = numPhysicalCores / ratio;
}
}
#elif defined(__FreeBSD__)
#include <sys/param.h>
#include <sys/sysctl.h>
/* Use physical core sysctl when available
* see: man 4 smp, man 3 sysctl */
int UTIL_countPhysicalCores(void)
{
static int numPhysicalCores = 0; /* freebsd sysctl is native int sized */
if (numPhysicalCores != 0) return numPhysicalCores;
#if __FreeBSD_version >= 1300008
{ size_t size = sizeof(numPhysicalCores);
int ret = sysctlbyname("kern.smp.cores", &numPhysicalCores, &size, NULL, 0);
if (ret == 0) return numPhysicalCores;
if (errno != ENOENT) {
perror("zstd: can't get number of physical cpus");
exit(1);
}
/* sysctl not present, fall through to older sysconf method */
}
#endif
numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
if (numPhysicalCores == -1) {
/* value not queryable, fall back on 1 */
numPhysicalCores = 1;
}
return numPhysicalCores;
}
#elif defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__CYGWIN__)
/* Use POSIX sysconf
* see: man 3 sysconf */
int UTIL_countPhysicalCores(void)
{
static int numPhysicalCores = 0;
if (numPhysicalCores != 0) return numPhysicalCores;
numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
if (numPhysicalCores == -1) {
/* value not queryable, fall back on 1 */
return numPhysicalCores = 1;
}
return numPhysicalCores;
}
#else
int UTIL_countPhysicalCores(void)
{
/* assume 1 */
return 1;
}
#endif
#if defined (__cplusplus)
}
#endif
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