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Diffstat (limited to '')
| -rw-r--r-- | src/basic/path-util.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/src/basic/path-util.h b/src/basic/path-util.h new file mode 100644 index 0000000..09604ba --- /dev/null +++ b/src/basic/path-util.h @@ -0,0 +1,208 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include <alloca.h> +#include <stdbool.h> +#include <stddef.h> + +#include "macro.h" +#include "string-util.h" +#include "strv.h" +#include "time-util.h" + +#define PATH_SPLIT_SBIN_BIN(x) x "sbin:" x "bin" +#define PATH_SPLIT_SBIN_BIN_NULSTR(x) x "sbin\0" x "bin\0" + +#define PATH_NORMAL_SBIN_BIN(x) x "bin" +#define PATH_NORMAL_SBIN_BIN_NULSTR(x) x "bin\0" + +#if HAVE_SPLIT_BIN +# define PATH_SBIN_BIN(x) PATH_SPLIT_SBIN_BIN(x) +# define PATH_SBIN_BIN_NULSTR(x) PATH_SPLIT_SBIN_BIN_NULSTR(x) +#else +# define PATH_SBIN_BIN(x) PATH_NORMAL_SBIN_BIN(x) +# define PATH_SBIN_BIN_NULSTR(x) PATH_NORMAL_SBIN_BIN_NULSTR(x) +#endif + +#define DEFAULT_PATH_NORMAL PATH_SBIN_BIN("/usr/local/") ":" PATH_SBIN_BIN("/usr/") +#define DEFAULT_PATH_NORMAL_NULSTR PATH_SBIN_BIN_NULSTR("/usr/local/") PATH_SBIN_BIN_NULSTR("/usr/") +#define DEFAULT_PATH_SPLIT_USR DEFAULT_PATH_NORMAL ":" PATH_SBIN_BIN("/") +#define DEFAULT_PATH_SPLIT_USR_NULSTR DEFAULT_PATH_NORMAL_NULSTR PATH_SBIN_BIN_NULSTR("/") +#define DEFAULT_PATH_COMPAT PATH_SPLIT_SBIN_BIN("/usr/local/") ":" PATH_SPLIT_SBIN_BIN("/usr/") ":" PATH_SPLIT_SBIN_BIN("/") + +#if HAVE_SPLIT_USR +# define DEFAULT_PATH DEFAULT_PATH_SPLIT_USR +# define DEFAULT_PATH_NULSTR DEFAULT_PATH_SPLIT_USR_NULSTR +#else +# define DEFAULT_PATH DEFAULT_PATH_NORMAL +# define DEFAULT_PATH_NULSTR DEFAULT_PATH_NORMAL_NULSTR +#endif + +#ifndef DEFAULT_USER_PATH +# define DEFAULT_USER_PATH DEFAULT_PATH +#endif + +static inline bool is_path(const char *p) { + if (!p) /* A NULL pointer is definitely not a path */ + return false; + + return strchr(p, '/'); +} + +static inline bool path_is_absolute(const char *p) { + if (!p) /* A NULL pointer is definitely not an absolute path */ + return false; + + return p[0] == '/'; +} + +int path_split_and_make_absolute(const char *p, char ***ret); +char* path_make_absolute(const char *p, const char *prefix); +int safe_getcwd(char **ret); +int path_make_absolute_cwd(const char *p, char **ret); +int path_make_relative(const char *from, const char *to, char **ret); +int path_make_relative_parent(const char *from_child, const char *to, char **ret); +char* path_startswith_full(const char *path, const char *prefix, bool accept_dot_dot) _pure_; +static inline char* path_startswith(const char *path, const char *prefix) { + return path_startswith_full(path, prefix, true); +} +int path_compare(const char *a, const char *b) _pure_; + +static inline bool path_equal(const char *a, const char *b) { + return path_compare(a, b) == 0; +} + +bool path_equal_or_files_same(const char *a, const char *b, int flags); +/* Compares only the last portion of the input paths, ie: the filenames */ +bool path_equal_filename(const char *a, const char *b); + +char* path_extend_internal(char **x, ...); +#define path_extend(x, ...) path_extend_internal(x, __VA_ARGS__, POINTER_MAX) +#define path_join(...) path_extend_internal(NULL, __VA_ARGS__, POINTER_MAX) + +typedef enum PathSimplifyFlags { + PATH_SIMPLIFY_KEEP_TRAILING_SLASH = 1 << 0, +} PathSimplifyFlags; + +char* path_simplify_full(char *path, PathSimplifyFlags flags); +static inline char* path_simplify(char *path) { + return path_simplify_full(path, 0); +} + +static inline bool path_equal_ptr(const char *a, const char *b) { + return !!a == !!b && (!a || path_equal(a, b)); +} + +/* Note: the search terminates on the first NULL item. */ +#define PATH_IN_SET(p, ...) path_strv_contains(STRV_MAKE(__VA_ARGS__), p) + +char* path_startswith_strv(const char *p, char **set); +#define PATH_STARTSWITH_SET(p, ...) path_startswith_strv(p, STRV_MAKE(__VA_ARGS__)) + +int path_strv_make_absolute_cwd(char **l); +char** path_strv_resolve(char **l, const char *root); +char** path_strv_resolve_uniq(char **l, const char *root); + +int find_executable_full(const char *name, const char *root, char **exec_search_path, bool use_path_envvar, char **ret_filename, int *ret_fd); +static inline int find_executable(const char *name, char **ret_filename) { + return find_executable_full(name, /* root= */ NULL, NULL, true, ret_filename, NULL); +} + +bool paths_check_timestamp(const char* const* paths, usec_t *paths_ts_usec, bool update); + +int fsck_exists(void); +int fsck_exists_for_fstype(const char *fstype); + +/* Iterates through the path prefixes of the specified path, going up + * the tree, to root. Also returns "" (and not "/"!) for the root + * directory. Excludes the specified directory itself */ +#define PATH_FOREACH_PREFIX(prefix, path) \ + for (char *_slash = ({ \ + path_simplify(strcpy(prefix, path)); \ + streq(prefix, "/") ? NULL : strrchr(prefix, '/'); \ + }); \ + _slash && ((*_slash = 0), true); \ + _slash = strrchr((prefix), '/')) + +/* Same as PATH_FOREACH_PREFIX but also includes the specified path itself */ +#define PATH_FOREACH_PREFIX_MORE(prefix, path) \ + for (char *_slash = ({ \ + path_simplify(strcpy(prefix, path)); \ + if (streq(prefix, "/")) \ + prefix[0] = 0; \ + strrchr(prefix, 0); \ + }); \ + _slash && ((*_slash = 0), true); \ + _slash = strrchr((prefix), '/')) + +/* Similar to path_join(), but only works for two components, and only the first one may be NULL and returns + * an alloca() buffer, or possibly a const pointer into the path parameter. */ +#define prefix_roota(root, path) \ + ({ \ + const char* _path = (path), *_root = (root), *_ret; \ + char *_p, *_n; \ + size_t _l; \ + while (_path[0] == '/' && _path[1] == '/') \ + _path ++; \ + if (isempty(_root)) \ + _ret = _path; \ + else { \ + _l = strlen(_root) + 1 + strlen(_path) + 1; \ + _n = newa(char, _l); \ + _p = stpcpy(_n, _root); \ + while (_p > _n && _p[-1] == '/') \ + _p--; \ + if (_path[0] != '/') \ + *(_p++) = '/'; \ + strcpy(_p, _path); \ + _ret = _n; \ + } \ + _ret; \ + }) + +int path_find_first_component(const char **p, bool accept_dot_dot, const char **ret); +int path_find_last_component(const char *path, bool accept_dot_dot, const char **next, const char **ret); +const char* last_path_component(const char *path); +int path_extract_filename(const char *path, char **ret); +int path_extract_directory(const char *path, char **ret); + +bool filename_is_valid(const char *p) _pure_; +bool path_is_valid_full(const char *p, bool accept_dot_dot) _pure_; +static inline bool path_is_valid(const char *p) { + return path_is_valid_full(p, /* accept_dot_dot= */ true); +} +static inline bool path_is_safe(const char *p) { + return path_is_valid_full(p, /* accept_dot_dot= */ false); +} +bool path_is_normalized(const char *p) _pure_; + +char *file_in_same_dir(const char *path, const char *filename); + +bool hidden_or_backup_file(const char *filename) _pure_; + +bool is_device_path(const char *path); + +bool valid_device_node_path(const char *path); +bool valid_device_allow_pattern(const char *path); + +bool dot_or_dot_dot(const char *path); + +static inline const char *skip_dev_prefix(const char *p) { + const char *e; + + /* Drop any /dev prefix if there is any */ + + e = path_startswith(p, "/dev/"); + + return e ?: p; +} + +bool empty_or_root(const char *path); +static inline const char* empty_to_root(const char *path) { + return isempty(path) ? "/" : path; +} + +bool path_strv_contains(char **l, const char *path); +bool prefixed_path_strv_contains(char **l, const char *path); + +int path_glob_can_match(const char *pattern, const char *prefix, char **ret); |