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498 lines
20 KiB
498 lines
20 KiB
#pragma once
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#ifndef CWK_LIBRARY_H
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#define CWK_LIBRARY_H
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#include <stdbool.h>
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#include <stddef.h>
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#if defined(_WIN32) || defined(__CYGWIN__)
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#define CWK_EXPORT __declspec(dllexport)
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#define CWK_IMPORT __declspec(dllimport)
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#elif __GNUC__ >= 4
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#define CWK_EXPORT __attribute__((visibility("default")))
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#define CWK_IMPORT __attribute__((visibility("default")))
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#else
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#define CWK_EXPORT
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#define CWK_IMPORT
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#endif
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#if defined(CWK_SHARED)
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#if defined(CWK_EXPORTS)
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#define CWK_PUBLIC CWK_EXPORT
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#else
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#define CWK_PUBLIC CWK_IMPORT
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#endif
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#else
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#define CWK_PUBLIC
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#endif
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/**
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* A segment represents a single component of a path. For instance, on linux a
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* path might look like this "/var/log/", which consists of two segments "var"
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* and "log".
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*/
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struct cwk_segment
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{
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const char *path;
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const char *segments;
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const char *begin;
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const char *end;
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size_t size;
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};
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/**
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* The segment type can be used to identify whether a segment is a special
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* segment or not.
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*
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* CWK_NORMAL - normal folder or file segment
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* CWK_CURRENT - "./" current folder segment
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* CWK_BACK - "../" relative back navigation segment
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*/
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enum cwk_segment_type
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{
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CWK_NORMAL,
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CWK_CURRENT,
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CWK_BACK
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};
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/**
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* @brief Determines the style which is used for the path parsing and
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* generation.
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*/
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enum cwk_path_style
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{
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CWK_STYLE_WINDOWS,
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CWK_STYLE_UNIX
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};
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/**
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* @brief Generates an absolute path based on a base.
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*
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* This function generates an absolute path based on a base path and another
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* path. It is guaranteed to return an absolute path. If the second submitted
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* path is absolute, it will override the base path. The result will be
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* written to a buffer, which might be truncated if the buffer is not large
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* enough to hold the full path. However, the truncated result will always be
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* null-terminated. The returned value is the amount of characters which the
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* resulting path would take if it was not truncated (excluding the
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* null-terminating character).
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*
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* @param base The absolute base path on which the relative path will be
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* applied.
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* @param path The relative path which will be applied on the base path.
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* @param buffer The buffer where the result will be written to.
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* @param buffer_size The size of the result buffer.
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* @return Returns the total amount of characters of the new absolute path.
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*/
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CWK_PUBLIC size_t cwk_path_get_absolute(const char *base, const char *path,
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char *buffer, size_t buffer_size);
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/**
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* @brief Generates a relative path based on a base.
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*
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* This function generates a relative path based on a base path and another
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* path. It determines how to get to the submitted path, starting from the
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* base directory. The result will be written to a buffer, which might be
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* truncated if the buffer is not large enough to hold the full path. However,
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* the truncated result will always be null-terminated. The returned value is
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* the amount of characters which the resulting path would take if it was not
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* truncated (excluding the null-terminating character).
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*
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* @param base_directory The base path from which the relative path will
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* start.
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* @param path The target path where the relative path will point to.
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* @param buffer The buffer where the result will be written to.
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* @param buffer_size The size of the result buffer.
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* @return Returns the total amount of characters of the full path.
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*/
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CWK_PUBLIC size_t cwk_path_get_relative(const char *base_directory,
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const char *path, char *buffer, size_t buffer_size);
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/**
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* @brief Joins two paths together.
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*
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* This function generates a new path by combining the two submitted paths. It
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* will remove double separators, and unlike cwk_path_get_absolute it permits
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* the use of two relative paths to combine. The result will be written to a
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* buffer, which might be truncated if the buffer is not large enough to hold
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* the full path. However, the truncated result will always be
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* null-terminated. The returned value is the amount of characters which the
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* resulting path would take if it was not truncated (excluding the
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* null-terminating character).
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*
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* @param path_a The first path which comes first.
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* @param path_b The second path which comes after the first.
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* @param buffer The buffer where the result will be written to.
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* @param buffer_size The size of the result buffer.
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* @return Returns the total amount of characters of the full, combined path.
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*/
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CWK_PUBLIC size_t cwk_path_join(const char *path_a, const char *path_b,
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char *buffer, size_t buffer_size);
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/**
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* @brief Joins multiple paths together.
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*
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* This function generates a new path by joining multiple paths together. It
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* will remove double separators, and unlike cwk_path_get_absolute it permits
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* the use of multiple relative paths to combine. The last path of the
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* submitted string array must be set to NULL. The result will be written to a
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* buffer, which might be truncated if the buffer is not large enough to hold
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* the full path. However, the truncated result will always be
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* null-terminated. The returned value is the amount of characters which the
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* resulting path would take if it was not truncated (excluding the
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* null-terminating character).
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*
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* @param paths An array of paths which will be joined.
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* @param buffer The buffer where the result will be written to.
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* @param buffer_size The size of the result buffer.
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* @return Returns the total amount of characters of the full, combined path.
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*/
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CWK_PUBLIC size_t cwk_path_join_multiple(const char **paths, char *buffer,
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size_t buffer_size);
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/**
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* @brief Determines the root of a path.
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*
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* This function determines the root of a path by finding its length. The
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* root always starts at the submitted path. If the path has no root, the
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* length will be set to zero.
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*
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* @param path The path which will be inspected.
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* @param length The output of the root length.
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*/
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CWK_PUBLIC void cwk_path_get_root(const char *path, size_t *length);
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/**
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* @brief Changes the root of a path.
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*
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* This function changes the root of a path. It does not normalize the result.
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* The result will be written to a buffer, which might be truncated if the
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* buffer is not large enough to hold the full path. However, the truncated
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* result will always be null-terminated. The returned value is the amount of
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* characters which the resulting path would take if it was not truncated
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* (excluding the null-terminating character).
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*
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* @param path The original path which will get a new root.
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* @param new_root The new root which will be placed in the path.
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* @param buffer The output buffer where the result is written to.
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* @param buffer_size The size of the output buffer where the result is
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* written to.
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* @return Returns the total amount of characters of the new path.
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*/
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CWK_PUBLIC size_t cwk_path_change_root(const char *path, const char *new_root,
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char *buffer, size_t buffer_size);
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/**
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* @brief Determine whether the path is absolute or not.
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*
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* This function checks whether the path is an absolute path or not. A path is
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* considered to be absolute if the root ends with a separator.
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*
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* @param path The path which will be checked.
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* @return Returns true if the path is absolute or false otherwise.
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*/
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CWK_PUBLIC bool cwk_path_is_absolute(const char *path);
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/**
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* @brief Determine whether the path is relative or not.
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*
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* This function checks whether the path is a relative path or not. A path is
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* considered to be relative if the root does not end with a separator.
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*
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* @param path The path which will be checked.
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* @return Returns true if the path is relative or false otherwise.
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*/
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CWK_PUBLIC bool cwk_path_is_relative(const char *path);
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/**
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* @brief Gets the basename of a file path.
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*
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* This function gets the basename of a file path. A pointer to the beginning
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* of the basename will be returned through the basename parameter. This
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* pointer will be positioned on the first letter after the separator. The
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* length of the file path will be returned through the length parameter. The
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* length will be set to zero and the basename to NULL if there is no basename
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* available.
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*
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* @param path The path which will be inspected.
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* @param basename The output of the basename pointer.
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* @param length The output of the length of the basename. This may be
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* null if not required.
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*/
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CWK_PUBLIC void cwk_path_get_basename(const char *path, const char **basename,
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size_t *length);
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/**
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* @brief Changes the basename of a file path.
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*
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* This function changes the basename of a file path. This function will not
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* write out more than the specified buffer can contain. However, the
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* generated string is always null-terminated - even if not the whole path is
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* written out. The function returns the total number of characters the
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* complete buffer would have, even if it was not written out completely. The
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* path may be the same memory address as the buffer.
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*
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* @param path The original path which will be used for the modified path.
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* @param new_basename The new basename which will replace the old one.
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* @param buffer The buffer where the changed path will be written to.
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* @param buffer_size The size of the result buffer where the changed path is
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* written to.
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* @return Returns the size which the complete new path would have if it was
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* not truncated.
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*/
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CWK_PUBLIC size_t cwk_path_change_basename(const char *path,
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const char *new_basename, char *buffer, size_t buffer_size);
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/**
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* @brief Gets the dirname of a file path.
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*
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* This function determines the dirname of a file path and returns the length
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* up to which character is considered to be part of it. If no dirname is
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* found, the length will be set to zero. The beginning of the dirname is
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* always equal to the submitted path pointer.
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*
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* @param path The path which will be inspected.
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* @param length The length of the dirname.
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*/
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CWK_PUBLIC void cwk_path_get_dirname(const char *path, size_t *length);
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/**
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* @brief Gets the extension of a file path.
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*
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* This function extracts the extension portion of a file path. A pointer to
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* the beginning of the extension will be returned through the extension
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* parameter if an extension is found and true is returned. This pointer will
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* be positioned on the dot. The length of the extension name will be returned
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* through the length parameter. If no extension is found both parameters
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* won't be touched and false will be returned.
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*
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* @param path The path which will be inspected.
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* @param extension The output of the extension pointer.
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* @param length The output of the length of the extension.
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* @return Returns true if an extension is found or false otherwise.
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*/
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CWK_PUBLIC bool cwk_path_get_extension(const char *path, const char **extension,
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size_t *length);
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/**
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* @brief Determines whether the file path has an extension.
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*
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* This function determines whether the submitted file path has an extension.
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* This will evaluate to true if the last segment of the path contains a dot.
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*
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* @param path The path which will be inspected.
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* @return Returns true if the path has an extension or false otherwise.
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*/
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CWK_PUBLIC bool cwk_path_has_extension(const char *path);
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/**
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* @brief Changes the extension of a file path.
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*
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* This function changes the extension of a file name. The function will
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* append an extension if the basename does not have an extension, or use the
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* extension as a basename if the path does not have a basename. This function
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* will not write out more than the specified buffer can contain. However, the
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* generated string is always null-terminated - even if not the whole path is
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* written out. The function returns the total number of characters the
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* complete buffer would have, even if it was not written out completely. The
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* path may be the same memory address as the buffer.
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*
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* @param path The path which will be used to make the change.
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* @param new_extension The extension which will be placed within the new
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* path.
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* @param buffer The output buffer where the result will be written to.
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* @param buffer_size The size of the output buffer where the result will be
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* written to.
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* @return Returns the total size which the output would have if it was not
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* truncated.
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*/
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CWK_PUBLIC size_t cwk_path_change_extension(const char *path,
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const char *new_extension, char *buffer, size_t buffer_size);
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/**
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* @brief Creates a normalized version of the path.
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*
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* This function creates a normalized version of the path within the specified
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* buffer. This function will not write out more than the specified buffer can
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* contain. However, the generated string is always null-terminated - even if
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* not the whole path is written out. The function returns the total number of
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* characters the complete buffer would have, even if it was not written out
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* completely. The path may be the same memory address as the buffer.
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*
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* The following will be true for the normalized path:
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* 1) "../" will be resolved.
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* 2) "./" will be removed.
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* 3) double separators will be fixed with a single separator.
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* 4) separator suffixes will be removed.
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*
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* @param path The path which will be normalized.
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* @param buffer The buffer where the new path is written to.
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* @param buffer_size The size of the buffer.
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* @return The size which the complete normalized path has if it was not
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* truncated.
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*/
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CWK_PUBLIC size_t cwk_path_normalize(const char *path, char *buffer,
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size_t buffer_size);
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/**
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* @brief Finds common portions in two paths.
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*
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* This function finds common portions in two paths and returns the number
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* characters from the beginning of the base path which are equal to the other
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* path.
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*
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* @param path_base The base path which will be compared with the other path.
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* @param path_other The other path which will compared with the base path.
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* @return Returns the number of characters which are common in the base path.
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*/
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CWK_PUBLIC size_t cwk_path_get_intersection(const char *path_base,
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const char *path_other);
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/**
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* @brief Gets the first segment of a path.
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*
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* This function finds the first segment of a path. The position of the
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* segment is set to the first character after the separator, and the length
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* counts all characters until the next separator (excluding the separator).
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*
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* @param path The path which will be inspected.
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* @param segment The segment which will be extracted.
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* @return Returns true if there is a segment or false if there is none.
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*/
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CWK_PUBLIC bool cwk_path_get_first_segment(const char *path,
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struct cwk_segment *segment);
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/**
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* @brief Gets the last segment of the path.
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*
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* This function gets the last segment of a path. This function may return
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* false if the path doesn't contain any segments, in which case the submitted
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* segment parameter is not modified. The position of the segment is set to
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* the first character after the separator, and the length counts all
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* characters until the end of the path (excluding the separator).
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*
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* @param path The path which will be inspected.
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* @param segment The segment which will be extracted.
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* @return Returns true if there is a segment or false if there is none.
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*/
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CWK_PUBLIC bool cwk_path_get_last_segment(const char *path,
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struct cwk_segment *segment);
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/**
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* @brief Advances to the next segment.
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*
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* This function advances the current segment to the next segment. If there
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* are no more segments left, the submitted segment structure will stay
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* unchanged and false is returned.
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*
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* @param segment The current segment which will be advanced to the next one.
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* @return Returns true if another segment was found or false otherwise.
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*/
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CWK_PUBLIC bool cwk_path_get_next_segment(struct cwk_segment *segment);
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/**
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* @brief Moves to the previous segment.
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*
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* This function moves the current segment to the previous segment. If the
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* current segment is the first one, the submitted segment structure will stay
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* unchanged and false is returned.
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*
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* @param segment The current segment which will be moved to the previous one.
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* @return Returns true if there is a segment before this one or false
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* otherwise.
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*/
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CWK_PUBLIC bool cwk_path_get_previous_segment(struct cwk_segment *segment);
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/**
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* @brief Gets the type of the submitted path segment.
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*
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* This function inspects the contents of the segment and determines the type
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* of it. Currently, there are three types CWK_NORMAL, CWK_CURRENT and
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* CWK_BACK. A CWK_NORMAL segment is a normal folder or file entry. A
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* CWK_CURRENT is a "./" and a CWK_BACK a "../" segment.
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*
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* @param segment The segment which will be inspected.
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* @return Returns the type of the segment.
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*/
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CWK_PUBLIC enum cwk_segment_type cwk_path_get_segment_type(
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const struct cwk_segment *segment);
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/**
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* @brief Changes the content of a segment.
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*
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* This function overrides the content of a segment to the submitted value and
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* outputs the whole new path to the submitted buffer. The result might
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* require less or more space than before if the new value length differs from
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* the original length. The output is truncated if the new path is larger than
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* the submitted buffer size, but it is always null-terminated. The source of
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* the segment and the submitted buffer may be the same.
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*
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* @param segment The segment which will be modifier.
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* @param value The new content of the segment.
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* @param buffer The buffer where the modified path will be written to.
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* @param buffer_size The size of the output buffer.
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* @return Returns the total size which would have been written if the output
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* was not truncated.
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*/
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CWK_PUBLIC size_t cwk_path_change_segment(struct cwk_segment *segment,
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const char *value, char *buffer, size_t buffer_size);
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/**
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* @brief Checks whether the submitted pointer points to a separator.
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*
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* This function simply checks whether the submitted pointer points to a
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* separator, which has to be null-terminated (but not necessarily after the
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* separator). The function will return true if it is a separator, or false
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* otherwise.
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*
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* @param symbol A pointer to a string.
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* @return Returns true if it is a separator, or false otherwise.
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*/
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CWK_PUBLIC bool cwk_path_is_separator(const char *str);
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/**
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* @brief Guesses the path style.
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*
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* This function guesses the path style based on a submitted path-string. The
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* guessing will look at the root and the type of slashes contained in the
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* path and return the style which is more likely used in the path.
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*
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* @param path The path which will be inspected.
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* @return Returns the style which is most likely used for the path.
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*/
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CWK_PUBLIC enum cwk_path_style cwk_path_guess_style(const char *path);
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/**
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* @brief Configures which path style is used.
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*
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* This function configures which path style is used. The following styles are
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* currently supported.
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*
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* CWK_STYLE_WINDOWS: Use backslashes as a separator and volume for the root.
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* CWK_STYLE_UNIX: Use slashes as a separator and a slash for the root.
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*
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* @param style The style which will be used from now on.
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*/
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CWK_PUBLIC void cwk_path_set_style(enum cwk_path_style style);
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/**
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* @brief Gets the path style configuration.
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*
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* This function gets the style configuration which is currently used for the
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* paths. This configuration determines how paths are parsed and generated.
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*
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* @return Returns the current path style configuration.
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*/
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CWK_PUBLIC enum cwk_path_style cwk_path_get_style(void);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif
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