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2e4fa6864c
Utf8CStr is in many cases a better string view class than std::string_view, because it provides "view" access to a string buffer that is guaranteed to be null terminated. It also has the additional benefit of being UTF-8 verified and can seemlessly cross FFI boundaries. We would want to start use more Utf8CStr in our existing C++ codebase.
84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
#pragma once
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#include <sys/stat.h>
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#include <linux/fs.h>
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#include <functional>
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#include <string_view>
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#include <string>
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#include "base-rs.hpp"
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struct mmap_data : public byte_data {
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static_assert((sizeof(void *) == 8 && BLKGETSIZE64 == 0x80081272) ||
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(sizeof(void *) == 4 && BLKGETSIZE64 == 0x80041272));
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ALLOW_MOVE_ONLY(mmap_data)
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explicit mmap_data(const char *name, bool rw = false);
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mmap_data(int dirfd, const char *name, bool rw = false);
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mmap_data(int fd, size_t sz, bool rw = false);
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~mmap_data();
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};
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extern "C" {
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int mkdirs(const char *path, mode_t mode);
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ssize_t canonical_path(const char * __restrict__ path, char * __restrict__ buf, size_t bufsiz);
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bool rm_rf(const char *path);
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bool frm_rf(int dirfd);
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bool cp_afc(const char *src, const char *dest);
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bool mv_path(const char *src, const char *dest);
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bool link_path(const char *src, const char *dest);
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bool clone_attr(const char *src, const char *dest);
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bool fclone_attr(int src, int dest);
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} // extern "C"
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std::string full_read(int fd);
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std::string full_read(const char *filename);
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void write_zero(int fd, size_t size);
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std::string resolve_preinit_dir(const char *base_dir);
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// Functor = function<bool(Utf8CStr, Utf8CStr)>
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template <typename Functor>
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void parse_prop_file(const char *file, Functor &&fn) {
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parse_prop_file_rs(file, [&](rust::Str key, rust::Str val) -> bool {
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// We perform the null termination here in C++ because it's very difficult to do it
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// right in Rust due to pointer provenance. Trying to dereference a pointer without
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// the correct provenance in Rust, even in unsafe code, is undefined behavior.
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// However on the C++ side, there are fewer restrictions on pointers, so the const_cast here
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// will not trigger UB in the compiler.
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*(const_cast<char *>(key.data()) + key.size()) = '\0';
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*(const_cast<char *>(val.data()) + val.size()) = '\0';
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return fn(Utf8CStr(key.data(), key.size() + 1), Utf8CStr(val.data(), val.size() + 1));
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});
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}
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using sFILE = std::unique_ptr<FILE, decltype(&fclose)>;
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using sDIR = std::unique_ptr<DIR, decltype(&closedir)>;
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sDIR make_dir(DIR *dp);
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sFILE make_file(FILE *fp);
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static inline sDIR open_dir(const char *path) {
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return make_dir(opendir(path));
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}
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static inline sDIR xopen_dir(const char *path) {
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return make_dir(xopendir(path));
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}
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static inline sDIR xopen_dir(int dirfd) {
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return make_dir(xfdopendir(dirfd));
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}
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static inline sFILE open_file(const char *path, const char *mode) {
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return make_file(fopen(path, mode));
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}
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static inline sFILE xopen_file(const char *path, const char *mode) {
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return make_file(xfopen(path, mode));
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}
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static inline sFILE xopen_file(int fd, const char *mode) {
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return make_file(xfdopen(fd, mode));
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}
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