mirror of https://github.com/bsnes-emu/bsnes.git
96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
#ifndef NALL_STORAGE_HPP
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#define NALL_STORAGE_HPP
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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 storage {
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enum class time : unsigned { access, modify };
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static auto exists(const string& name) -> bool;
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static auto readable(const string& name) -> bool;
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static auto writable(const string& name) -> bool;
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static auto executable(const string& name) -> bool;
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static auto uid(const string& name) -> unsigned;
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static auto gid(const string& name) -> unsigned;
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static auto mode(const string& name) -> unsigned;
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static auto timestamp(const string& name, storage::time mode = storage::time::modify) -> time_t;
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static auto create(const string& name, unsigned permissions = 0755) -> bool;
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static auto rename(const string& name, const string& targetname) -> bool;
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static auto remove(const string& name) -> bool;
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};
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inline auto storage::exists(const string& name) -> bool {
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return access(name, F_OK) == 0;
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}
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inline auto storage::readable(const string& name) -> bool {
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return access(name, R_OK) == 0;
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}
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inline auto storage::writable(const string& name) -> bool {
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return access(name, W_OK) == 0;
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}
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inline auto storage::executable(const string& name) -> bool {
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return access(name, X_OK) == 0;
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}
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inline auto storage::uid(const string& name) -> unsigned {
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struct stat data = {0};
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stat(name, &data);
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return data.st_uid;
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}
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inline auto storage::gid(const string& name) -> unsigned {
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struct stat data = {0};
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stat(name, &data);
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return data.st_gid;
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}
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inline auto storage::mode(const string& name) -> unsigned {
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struct stat data = {0};
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stat(name, &data);
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return data.st_mode;
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}
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inline auto storage::timestamp(const string& name, storage::time mode) -> time_t {
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struct stat data = {0};
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stat(name, &data);
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switch(mode) {
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case storage::time::access: return data.st_atime;
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case storage::time::modify: return data.st_mtime;
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}
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throw;
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}
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//returns true if 'name' already exists
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inline auto storage::create(const string& name, unsigned permissions) -> bool {
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if(storage::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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inline auto storage::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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inline auto storage::remove(const string& name) -> bool {
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if(name.endsWith("/")) return rmdir(name) == 0;
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return unlink(name) == 0;
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}
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}
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#endif
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