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kc3-lang/pkgconf/libpkgconf/path.c
Graham Ollis
- libpkgconf/path.c
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/* * path.c * filesystem path management * * Copyright (c) 2016 pkgconf authors (see AUTHORS). * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * This software is provided 'as is' and without any warranty, express or * implied. In no event shall the authors be liable for any damages arising * from the use of this software. */ #include <libpkgconf/libpkgconf.h> #include <libpkgconf/config.h> #ifdef HAVE_SYS_STAT_H # include <sys/stat.h> # define PKGCONF_CACHE_INODES #endif static bool #ifdef PKGCONF_CACHE_INODES path_list_contains_entry(const char *text, pkgconf_list_t *dirlist, struct stat *st) #else path_list_contains_entry(const char *text, pkgconf_list_t *dirlist) #endif { pkgconf_node_t *n; PKGCONF_FOREACH_LIST_ENTRY(dirlist->head, n) { pkgconf_path_t *pn = n->data; #ifdef PKGCONF_CACHE_INODES if (((dev_t) pn->handle_device) == st->st_dev && ((ino_t) pn->handle_path) == st->st_ino) return true; #endif if (!strcmp(text, pn->path)) return true; } return false; } /* * !doc * * libpkgconf `path` module * ======================== * * The `path` module provides functions for manipulating lists of paths in a cross-platform manner. Notably, * it is used by the `pkgconf client` to parse the ``PKG_CONFIG_PATH``, ``PKG_CONFIG_LIBDIR`` and related environment * variables. */ /* * !doc * * .. c:function:: void pkgconf_path_add(const char *text, pkgconf_list_t *dirlist) * * Adds a path node to a path list. If the path is already in the list, do nothing. * * :param char* text: The path text to add as a path node. * :param pkgconf_list_t* dirlist: The path list to add the path node to. * :param bool filter: Whether to perform duplicate filtering. * :return: nothing */ void pkgconf_path_add(const char *text, pkgconf_list_t *dirlist, bool filter) { pkgconf_path_t *node; #ifdef PKGCONF_CACHE_INODES struct stat st; if (filter && stat(text, &st) == -1) return; if (filter && path_list_contains_entry(text, dirlist, &st)) return; #else if (filter && path_list_contains_entry(text, dirlist)) return; #endif node = calloc(sizeof(pkgconf_path_t), 1); node->path = strdup(text); #ifdef PKGCONF_CACHE_INODES node->handle_path = (void *)(intptr_t) st.st_ino; node->handle_device = (void *)(intptr_t) st.st_dev; #endif pkgconf_node_insert_tail(&node->lnode, node, dirlist); } /* * !doc * * .. c:function:: size_t pkgconf_path_split(const char *text, pkgconf_list_t *dirlist) * * Splits a given text input and inserts paths into a path list. * * :param char* text: The path text to split and add as path nodes. * :param pkgconf_list_t* dirlist: The path list to have the path nodes added to. * :param bool filter: Whether to perform duplicate filtering. * :return: number of path nodes added to the path list * :rtype: size_t */ size_t pkgconf_path_split(const char *text, pkgconf_list_t *dirlist, bool filter) { size_t count = 0; char *workbuf, *p, *iter; if (text == NULL) return 0; iter = workbuf = strdup(text); while ((p = strtok(iter, PKG_CONFIG_PATH_SEP_S)) != NULL) { pkgconf_path_add(p, dirlist, filter); count++, iter = NULL; } free(workbuf); return count; } /* * !doc * * .. c:function:: size_t pkgconf_path_build_from_environ(const char *environ, const char *fallback, pkgconf_list_t *dirlist) * * Adds the paths specified in an environment variable to a path list. If the environment variable is not set, * an optional default set of paths is added. * * :param char* environ: The environment variable to look up. * :param char* fallback: The fallback paths to use if the environment variable is not set. * :param pkgconf_list_t* dirlist: The path list to add the path nodes to. * :param bool filter: Whether to perform duplicate filtering. * :return: number of path nodes added to the path list * :rtype: size_t */ size_t pkgconf_path_build_from_environ(const char *environ, const char *fallback, pkgconf_list_t *dirlist, bool filter) { const char *data; data = getenv(environ); if (data != NULL) return pkgconf_path_split(data, dirlist, filter); if (fallback != NULL) return pkgconf_path_split(fallback, dirlist, filter); /* no fallback and no environment variable, thusly no nodes added */ return 0; } /* * !doc * * .. c:function:: bool pkgconf_path_match_list(const char *path, const pkgconf_list_t *dirlist) * * Checks whether a path has a matching prefix in a path list. * * :param char* path: The path to check against a path list. * :param pkgconf_list_t* dirlist: The path list to check the path against. * :return: true if the path list has a matching prefix, otherwise false * :rtype: bool */ bool pkgconf_path_match_list(const char *path, const pkgconf_list_t *dirlist) { pkgconf_node_t *n = NULL; PKGCONF_FOREACH_LIST_ENTRY(dirlist->head, n) { pkgconf_path_t *pnode = n->data; if (!strcmp(pnode->path, path)) return true; } return false; } /* * !doc * * .. c:function:: void pkgconf_path_free(pkgconf_list_t *dirlist) * * Releases any path nodes attached to the given path list. * * :param pkgconf_list_t* dirlist: The path list to clean up. * :return: nothing */ void pkgconf_path_free(pkgconf_list_t *dirlist) { pkgconf_node_t *n, *tn; PKGCONF_FOREACH_LIST_ENTRY_SAFE(dirlist->head, tn, n) { pkgconf_path_t *pnode = n->data; free(pnode->path); free(pnode); } }