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#ifndef RBIMPL_INTERN_FILE_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_INTERN_FILE_H /** * @file * @author Ruby developers <ruby-core@ruby-lang.org> * @copyright This file is a part of the programming language Ruby. * Permission is hereby granted, to either redistribute and/or * modify this file, provided that the conditions mentioned in the * file COPYING are met. Consult the file for details. * @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are * implementation details. Don't take them as canon. They could * rapidly appear then vanish. The name (path) of this header file * is also an implementation detail. Do not expect it to persist * at the place it is now. Developers are free to move it anywhere * anytime at will. * @note To ruby-core: remember that this header can be possibly * recursively included from extension libraries written in C++. * Do not expect for instance `__VA_ARGS__` is always available. * We assume C99 for ruby itself but we don't assume languages of * extension libraries. They could be written in C++98. * @brief Public APIs related to ::rb_cFile. */ #include "ruby/internal/attr/nonnull.h" #include "ruby/internal/attr/pure.h" #include "ruby/internal/dllexport.h" #include "ruby/internal/value.h" RBIMPL_SYMBOL_EXPORT_BEGIN() /* file.c */ RBIMPL_ATTR_NONNULL(()) /** * Identical to rb_file_expand_path(), except how arguments are passed. * * @param[in] argc Number of objects of `argv`. * @param[in] argv Filename, and base directory, in that order. * @exception rb_eArgError Wrong `argc`. * @exception rb_eTypeError Non-string passed. * @exception rb_eEncCompatError No conversion from arguments to a path. * @return Expanded path. * * @internal * * It seems nobody actually uses this function right now. Maybe delete it? */ VALUE rb_file_s_expand_path(int argc, const VALUE *argv); /** * Identical to rb_file_absolute_path(), except it additionally understands * `~`. If a given pathname starts with `~someone/`, that part expands to the * user's home directory (or that of current process' owner's in case of `~/`). * * @param[in] fname Relative file name. * @param[in] dname Lookup base directory name, or in case * ::RUBY_Qnil is passed the process' current * working directory is assumed. * @exception rb_eArgError Home directory is not absolute. * @exception rb_eTypeError Non-string passed. * @exception rb_eEncCompatError No conversion from arguments to a path. * @return Expanded path. */ VALUE rb_file_expand_path(VALUE fname, VALUE dname); RBIMPL_ATTR_NONNULL(()) /** * Identical to rb_file_absolute_path(), except how arguments are passed. * * @param[in] argc Number of objects of `argv`. * @param[in] argv Filename, and base directory, in that order. * @exception rb_eArgError Wrong `argc`. * @exception rb_eTypeError Non-string passed. * @exception rb_eEncCompatError No conversion from arguments to a path. * @return Expanded path. * * @internal * * It seems nobody actually uses this function right now. Maybe delete it? */ VALUE rb_file_s_absolute_path(int argc, const VALUE *argv); /** * Maps a relative path to its absolute representation. Relative paths are * referenced from the passed directory name, or from the process' current * working directory in case ::RUBY_Qnil is passed. * * @param[in] fname Relative file name. * @param[in] dname Lookup base directory name, or in case * ::RUBY_Qnil is passed the process' current * working directory is assumed. * @exception rb_eArgError Strings contain NUL bytes. * @exception rb_eTypeError Non-string passed. * @exception rb_eEncCompatError No conversion from arguments to a path. * @return Expanded path. */ VALUE rb_file_absolute_path(VALUE fname, VALUE dname); /** * Strips a file path's last component (and trailing separators if any). This * function is relatively simple on POSIX environments; just splits the input * with `/`, strips the last one, if something remains joins them again, * otherwise the return value is `"."`. However when it comes to Windows this * function is quite very much complicated. We have to take UNC etc. into * account. So for instance `"C:foo"`'s dirname is `"C:."`. * * @param[in] fname File name to strip. * @exception rb_eTypeError `fname` is not a String. * @exception rb_eArgError `fname` contains NUL bytes. * @exception rb_eEncCompatError `fname`'s encoding is not path-compat. * @return A dirname of `fname`. * @note This is a "pure" operation; it computes the return value solely * from the passed object and never does any file IO. */ VALUE rb_file_dirname(VALUE fname); RBIMPL_ATTR_NONNULL(()) /** * Resolves a feature's path. This function takes for instance `"json"` and * `[".so", ".rb"]`, and iterates over the `$LOAD_PATH` to see if there is * either `json.so` or `json.rb` in the directory. * * This is not what everything `require` does, but at least `require` is built * on top of it. * * @param[in,out] feature File to search, and return buffer. * @param[in] exts List of file extensions. * @exception rb_eTypeError `feature` is not a String. * @exception rb_eArgError `feature` contains NUL bytes. * @exception rb_eEncCompatError `feature`'s encoding is not path-compat. * @retval 0 Not found * @retval otherwise Found index in `ext`, plus one. * @post `*feature` is a resolved path. */ int rb_find_file_ext(VALUE *feature, const char *const *exts); /** * Identical to rb_find_file_ext(), except it takes a feature name and is * extension at once, e.g. `"json.rb"`. This difference is much like how * `require` and `load` are different. * * @param[in] path A path relative to `$LOAD_PATH`. * @exception rb_eTypeError `path` is not a String. * @exception rb_eArgError `path` contains NUL bytes. * @exception rb_eEncCompatError `path`'s encoding is not path-compat. * @return Expanded path. */ VALUE rb_find_file(VALUE path); /** * Queries if the given path is either a directory, or a symlink that * (potentially recursively) points to such thing. * * @param[in] _ Ignored (why...?) * @param[in] path String, or IO. In case of IO it issues * `fstat(2)` instead of `stat(2)`. * @exception rb_eFrozenError `path` is a frozen IO (why...?) * @exception rb_eTypeError `path` is neither String nor IO. * @exception rb_eArgError `path` contains NUL bytes. * @exception rb_eEncCompatError `path`'s encoding is not path-compat. * @retval RUBY_Qtrue `path` is a directory. * @retval RUBY_Qfalse Otherwise. */ VALUE rb_file_directory_p(VALUE _, VALUE path); /** * Converts a string into an "OS Path" encoding, if any. In most operating * systems there are no such things like per-OS default encoding of filename. * For them this function is no-op. However most notably on MacOS, pathnames * are UTF-8 encoded. It converts the given string into such encoding. * * @param[in] path An instance of ::rb_cString. * @exception rb_eEncCompatError `path`'s encoding is not path-compat. * @return `path`'s contents converted to the OS' path encoding. */ VALUE rb_str_encode_ospath(VALUE path); RBIMPL_ATTR_NONNULL(()) RBIMPL_ATTR_PURE() /** * Queries if the given path is an absolute path. On POSIX environments it is * as easy as `path[0] == '/'`. However on Windows, drive letters and UNC * paths are also taken into account. * * @param[in] path A possibly relative path string. * @retval 1 `path` is absolute. * @retval 0 `path` is relative. */ int rb_is_absolute_path(const char *path); /** * Queries the file size of the given file. Because this function calls * `fstat(2)` internally, it is a failure to pass a closed file to this * function. * * This function flushes the passed file's buffer if any. Can take time. * * @param[in] file A file object. * @exception rb_eFrozenError `file` is frozen. * @exception rb_eIOError `file` is closed. * @exception rb_eSystemCallError Permission denied etc. * @exception rb_eNoMethodError The given non-file object doesn't respond * to `#size`. * @return The size of the passed file. * @note Passing a non-regular file such as a UNIX domain socket to this * function is not a failure. But the return value is * unpredictable. POSIX's `<sys/stat.h>` states that "the use of * this field is unspecified" then. */ off_t rb_file_size(VALUE file); RBIMPL_SYMBOL_EXPORT_END() #endif /* RBIMPL_INTERN_FILE_H */