mirror of https://github.com/bsnes-emu/bsnes.git
113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
#pragma once
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//generic abstraction layer for common storage operations against both files and directories
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//these functions are not recursive; use directory::create() and directory::remove() for recursion
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#include <nall/platform.hpp>
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#include <nall/string.hpp>
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namespace nall {
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struct inode {
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enum class time : uint { create, modify, access };
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static auto exists(const string& name) -> bool {
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return access(name, F_OK) == 0;
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}
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static auto readable(const string& name) -> bool {
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return access(name, R_OK) == 0;
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}
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static auto writable(const string& name) -> bool {
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return access(name, W_OK) == 0;
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}
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static auto executable(const string& name) -> bool {
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return access(name, X_OK) == 0;
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}
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static auto mode(const string& name) -> uint {
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struct stat data{};
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stat(name, &data);
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return data.st_mode;
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}
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static auto uid(const string& name) -> uint {
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struct stat data{};
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stat(name, &data);
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return data.st_uid;
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}
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static auto gid(const string& name) -> uint {
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struct stat data{};
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stat(name, &data);
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return data.st_gid;
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}
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#if !defined(PLATFORM_WINDOWS)
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static auto user(const string& name) -> string {
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struct passwd* pw = getpwuid(uid(name));
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if(pw && pw->pw_name) return pw->pw_name;
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return {};
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}
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static auto group(const string& name) -> string {
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struct group* gr = getgrgid(gid(name));
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if(gr && gr->gr_name) return gr->gr_name;
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return {};
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}
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#endif
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static auto timestamp(const string& name, time mode = time::modify) -> uint64_t {
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struct stat data{};
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stat(name, &data);
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switch(mode) {
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#if defined(PLATFORM_WINDOWS)
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//on Windows, the last status change time (ctime) holds the file creation time instead
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case time::create: return data.st_ctime;
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#elif defined(PLATFORM_BSD) || defined(PLATFORM_MACOS)
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//st_birthtime may return -1 or st_atime if it is not supported by the file system
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//the best that can be done in this case is to return st_mtime if it's older
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case time::create: return min((uint)data.st_birthtime, (uint)data.st_mtime);
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#else
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//Linux simply doesn't support file creation time at all
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//this is also our fallback case for unsupported operating systems
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case time::create: return data.st_mtime;
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#endif
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case time::modify: return data.st_mtime;
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//for performance reasons, last access time is usually not enabled on various filesystems
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//ensure that the last access time is not older than the last modify time (eg for NTFS)
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case time::access: return max((uint)data.st_atime, data.st_mtime);
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}
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return 0;
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}
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//returns true if 'name' already exists
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static auto create(const string& name, uint permissions = 0755) -> bool {
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if(exists(name)) return true;
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if(name.endsWith("/")) return mkdir(name, permissions) == 0;
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int fd = open(name, O_CREAT | O_EXCL, permissions);
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if(fd < 0) return false;
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return close(fd), true;
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}
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//returns false if 'name' and 'targetname' are on different file systems (requires copy)
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static auto rename(const string& name, const string& targetname) -> bool {
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return ::rename(name, targetname) == 0;
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}
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//returns false if 'name' is a directory that is not empty
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static auto remove(const string& name) -> bool {
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#if defined(PLATFORM_WINDOWS)
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if(name.endsWith("/")) return _wrmdir(utf16_t(name)) == 0;
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return _wunlink(utf16_t(name)) == 0;
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#else
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if(name.endsWith("/")) return rmdir(name) == 0;
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return unlink(name) == 0;
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#endif
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}
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};
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}
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