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common: convert to standard stat()/fstat() interfaces

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Most modern Unix environments use 64-bit off_t by default: OpenBSD,
FreeBSD, OS X, and Linux libc implementations such as Musl.

glibc is the lone exception; it can default to 32 bits but this is
configurable by setting _FILE_OFFSET_BITS.

Avoiding the stat64()/fstat64() interfaces is desirable because they
are nonstandard and not implemented on many systems (including
OpenBSD and FreeBSD), and using 64 bits for stat()/fstat() is either
the default or trivial to set up.
This commit is contained in:
Anthony J. Bentley 2016-07-17 04:30:00 -06:00 committed by Jan Beich
parent 51f92f0e4e
commit 26af2b644c
2 changed files with 19 additions and 15 deletions
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9
CMakeLists.txt
View File

@ -105,6 +105,15 @@ else()
set(CMAKE_EXE_LINKER_FLAGS_RELEASE "/DEBUG /INCREMENTAL:NO /OPT:REF,ICF" CACHE STRING "" FORCE)
endif()
# Set file offset size to 64 bits.
#
# On modern Unixes, this is typically already the case. The lone exception is
# glibc, which may default to 32 bits. glibc allows this to be configured
# by setting _FILE_OFFSET_BITS.
if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
add_definitions(-D_FILE_OFFSET_BITS=64)
endif()
add_definitions(-DSINGLETHREADED)
# CMake seems to only define _DEBUG on Windows
set_property(DIRECTORY APPEND PROPERTY

25
src/common/file_util.cpp
View File

@ -23,8 +23,8 @@
#define fseeko _fseeki64
#define ftello _ftelli64
#define atoll _atoi64
#define stat64 _stat64
#define fstat64 _fstat64
#define stat _stat64
#define fstat _fstat64
#define fileno _fileno
#else
#ifdef __APPLE__
@ -52,11 +52,6 @@
#define S_ISDIR(m) (((m)&S_IFMT) == S_IFDIR)
#endif
#if !defined(_WIN32) && !defined(__APPLE__) && !defined(__GLIBC__) && !defined(__UCLIBC__)
#define stat64 stat
#define fstat64 fstat
#endif
// This namespace has various generic functions related to files and paths.
// The code still needs a ton of cleanup.
// REMEMBER: strdup considered harmful!
@ -76,7 +71,7 @@ static void StripTailDirSlashes(std::string& fname) {
// Returns true if file filename exists
bool Exists(const std::string& filename) {
struct stat64 file_info;
struct stat file_info;
std::string copy(filename);
StripTailDirSlashes(copy);
@ -88,7 +83,7 @@ bool Exists(const std::string& filename) {
int result = _wstat64(Common::UTF8ToUTF16W(copy).c_str(), &file_info);
#else
int result = stat64(copy.c_str(), &file_info);
int result = stat(copy.c_str(), &file_info);
#endif
return (result == 0);
@ -96,7 +91,7 @@ bool Exists(const std::string& filename) {
// Returns true if filename is a directory
bool IsDirectory(const std::string& filename) {
struct stat64 file_info;
struct stat file_info;
std::string copy(filename);
StripTailDirSlashes(copy);
@ -108,7 +103,7 @@ bool IsDirectory(const std::string& filename) {
int result = _wstat64(Common::UTF8ToUTF16W(copy).c_str(), &file_info);
#else
int result = stat64(copy.c_str(), &file_info);
int result = stat(copy.c_str(), &file_info);
#endif
if (result < 0) {
@ -339,11 +334,11 @@ u64 GetSize(const std::string& filename) {
return 0;
}
struct stat64 buf;
struct stat buf;
#ifdef _WIN32
if (_wstat64(Common::UTF8ToUTF16W(filename).c_str(), &buf) == 0)
#else
if (stat64(filename.c_str(), &buf) == 0)
if (stat(filename.c_str(), &buf) == 0)
#endif
{
LOG_TRACE(Common_Filesystem, "%s: %lld", filename.c_str(), (long long)buf.st_size);
@ -356,8 +351,8 @@ u64 GetSize(const std::string& filename) {
// Overloaded GetSize, accepts file descriptor
u64 GetSize(const int fd) {
struct stat64 buf;
if (fstat64(fd, &buf) != 0) {
struct stat buf;
if (fstat(fd, &buf) != 0) {
LOG_ERROR(Common_Filesystem, "GetSize: stat failed %i: %s", fd, GetLastErrorMsg());
return 0;
}