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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <dirent.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "macro.h"
#include "time-util.h"
#define LONG_LINE_MAX (1U*1024U*1024U)
typedef enum {
WRITE_STRING_FILE_CREATE = 1 << 0,
WRITE_STRING_FILE_TRUNCATE = 1 << 1,
WRITE_STRING_FILE_ATOMIC = 1 << 2,
WRITE_STRING_FILE_AVOID_NEWLINE = 1 << 3,
WRITE_STRING_FILE_VERIFY_ON_FAILURE = 1 << 4,
WRITE_STRING_FILE_VERIFY_IGNORE_NEWLINE = 1 << 5,
WRITE_STRING_FILE_SYNC = 1 << 6,
WRITE_STRING_FILE_DISABLE_BUFFER = 1 << 7,
WRITE_STRING_FILE_NOFOLLOW = 1 << 8,
WRITE_STRING_FILE_MKDIR_0755 = 1 << 9,
WRITE_STRING_FILE_MODE_0600 = 1 << 10,
WRITE_STRING_FILE_SUPPRESS_REDUNDANT_VIRTUAL = 1 << 11,
/* And before you wonder, why write_string_file_atomic_label_ts() is a separate function instead of just one
more flag here: it's about linking: we don't want to pull -lselinux into all users of write_string_file()
and friends. */
} WriteStringFileFlags;
typedef enum {
READ_FULL_FILE_SECURE = 1 << 0, /* erase any buffers we employ internally, after use */
READ_FULL_FILE_UNBASE64 = 1 << 1, /* base64 decode what we read */
READ_FULL_FILE_UNHEX = 1 << 2, /* hex decode what we read */
READ_FULL_FILE_WARN_WORLD_READABLE = 1 << 3, /* if regular file, log at LOG_WARNING level if access mode above 0700 */
READ_FULL_FILE_CONNECT_SOCKET = 1 << 4, /* if socket inode, connect to it and read off it */
READ_FULL_FILE_FAIL_WHEN_LARGER = 1 << 5, /* fail loading if file is larger than specified size */
} ReadFullFileFlags;
int fdopen_unlocked(int fd, const char *options, FILE **ret);
int take_fdopen_unlocked(int *fd, const char *options, FILE **ret);
FILE* take_fdopen(int *fd, const char *options);
DIR* take_fdopendir(int *dfd);
FILE* open_memstream_unlocked(char **ptr, size_t *sizeloc);
FILE* fmemopen_unlocked(void *buf, size_t size, const char *mode);
int write_string_stream_ts(FILE *f, const char *line, WriteStringFileFlags flags, const struct timespec *ts);
static inline int write_string_stream(FILE *f, const char *line, WriteStringFileFlags flags) {
return write_string_stream_ts(f, line, flags, NULL);
}
int write_string_file_ts_at(int dir_fd, const char *fn, const char *line, WriteStringFileFlags flags, const struct timespec *ts);
static inline int write_string_file_ts(const char *fn, const char *line, WriteStringFileFlags flags, const struct timespec *ts) {
return write_string_file_ts_at(AT_FDCWD, fn, line, flags, ts);
}
static inline int write_string_file_at(int dir_fd, const char *fn, const char *line, WriteStringFileFlags flags) {
return write_string_file_ts_at(dir_fd, fn, line, flags, NULL);
}
static inline int write_string_file(const char *fn, const char *line, WriteStringFileFlags flags) {
return write_string_file_ts(fn, line, flags, NULL);
}
int write_string_filef(const char *fn, WriteStringFileFlags flags, const char *format, ...) _printf_(3, 4);
int read_one_line_file_at(int dir_fd, const char *filename, char **ret);
static inline int read_one_line_file(const char *filename, char **ret) {
return read_one_line_file_at(AT_FDCWD, filename, ret);
}
int read_full_file_full(int dir_fd, const char *filename, uint64_t offset, size_t size, ReadFullFileFlags flags, const char *bind_name, char **ret_contents, size_t *ret_size);
static inline int read_full_file_at(int dir_fd, const char *filename, char **ret_contents, size_t *ret_size) {
return read_full_file_full(dir_fd, filename, UINT64_MAX, SIZE_MAX, 0, NULL, ret_contents, ret_size);
}
static inline int read_full_file(const char *filename, char **ret_contents, size_t *ret_size) {
return read_full_file_full(AT_FDCWD, filename, UINT64_MAX, SIZE_MAX, 0, NULL, ret_contents, ret_size);
}
int read_virtual_file_fd(int fd, size_t max_size, char **ret_contents, size_t *ret_size);
int read_virtual_file_at(int dir_fd, const char *filename, size_t max_size, char **ret_contents, size_t *ret_size);
static inline int read_virtual_file(const char *filename, size_t max_size, char **ret_contents, size_t *ret_size) {
return read_virtual_file_at(AT_FDCWD, filename, max_size, ret_contents, ret_size);
}
static inline int read_full_virtual_file(const char *filename, char **ret_contents, size_t *ret_size) {
return read_virtual_file(filename, SIZE_MAX, ret_contents, ret_size);
}
int read_full_stream_full(FILE *f, const char *filename, uint64_t offset, size_t size, ReadFullFileFlags flags, char **ret_contents, size_t *ret_size);
static inline int read_full_stream(FILE *f, char **ret_contents, size_t *ret_size) {
return read_full_stream_full(f, NULL, UINT64_MAX, SIZE_MAX, 0, ret_contents, ret_size);
}
int verify_file_at(int dir_fd, const char *fn, const char *blob, bool accept_extra_nl);
static inline int verify_file(const char *fn, const char *blob, bool accept_extra_nl) {
return verify_file_at(AT_FDCWD, fn, blob, accept_extra_nl);
}
int executable_is_script(const char *path, char **interpreter);
int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field);
DIR *xopendirat(int dirfd, const char *name, int flags);
typedef enum XfopenFlags {
XFOPEN_UNLOCKED = 1 << 0, /* call __fsetlocking(FSETLOCKING_BYCALLER) after opened */
XFOPEN_SOCKET = 1 << 1, /* also try to open unix socket */
} XfopenFlags;
int xfopenat_full(
int dir_fd,
const char *path,
const char *mode,
int open_flags,
XfopenFlags flags,
const char *bind_name,
FILE **ret);
static inline int xfopenat(int dir_fd, const char *path, const char *mode, int open_flags, FILE **ret) {
return xfopenat_full(dir_fd, path, mode, open_flags, 0, NULL, ret);
}
static inline int fopen_unlocked_at(int dir_fd, const char *path, const char *mode, int open_flags, FILE **ret) {
return xfopenat_full(dir_fd, path, mode, open_flags, XFOPEN_UNLOCKED, NULL, ret);
}
static inline int fopen_unlocked(const char *path, const char *mode, FILE **ret) {
return fopen_unlocked_at(AT_FDCWD, path, mode, 0, ret);
}
int fdopen_independent(int fd, const char *mode, FILE **ret);
int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **ret, char **ret_path);
int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **ret, char **ret_path);
int fflush_and_check(FILE *f);
int fflush_sync_and_check(FILE *f);
int write_timestamp_file_atomic(const char *fn, usec_t n);
int read_timestamp_file(const char *fn, usec_t *ret);
int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space);
typedef enum ReadLineFlags {
READ_LINE_ONLY_NUL = 1 << 0,
READ_LINE_IS_A_TTY = 1 << 1,
READ_LINE_NOT_A_TTY = 1 << 2,
} ReadLineFlags;
int read_line_full(FILE *f, size_t limit, ReadLineFlags flags, char **ret);
static inline bool file_offset_beyond_memory_size(off_t x) {
if (x < 0) /* off_t is signed, filter that out */
return false;
return (uint64_t) x > (uint64_t) SIZE_MAX;
}
static inline int read_line(FILE *f, size_t limit, char **ret) {
return read_line_full(f, limit, 0, ret);
}
static inline int read_nul_string(FILE *f, size_t limit, char **ret) {
return read_line_full(f, limit, READ_LINE_ONLY_NUL, ret);
}
int safe_fgetc(FILE *f, char *ret);
int warn_file_is_world_accessible(const char *filename, struct stat *st, const char *unit, unsigned line);
int fopen_mode_to_flags(const char *mode);
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