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pkgconf-2.0.2
libpkgconf/path.c
337 строк
8 KB
Ariadne Conill
path: prepend paths rather than append paths when processing --with-path arguments
04 авг 2023, 11:24
04 авг 2023, 11:24
384ade5
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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/config.h> #include <libpkgconf/stdinc.h> #include <libpkgconf/libpkgconf.h> #if defined(HAVE_SYS_STAT_H) && ! defined(_WIN32) # 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 (pn->handle_device == (void *)(intptr_t)st->st_dev && pn->handle_path == (void *)(intptr_t)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; char path[PKGCONF_ITEM_SIZE]; pkgconf_strlcpy(path, text, sizeof path); pkgconf_path_relocate(path, sizeof path); #ifdef PKGCONF_CACHE_INODES struct stat st; if (filter) { if (lstat(path, &st) == -1) return; if (S_ISLNK(st.st_mode)) { char pathbuf[PKGCONF_ITEM_SIZE * 4]; char *linkdest = realpath(path, pathbuf); if (linkdest != NULL && stat(linkdest, &st) == -1) return; } if (path_list_contains_entry(path, dirlist, &st)) return; } #else if (filter && path_list_contains_entry(path, dirlist)) return; #endif node = calloc(sizeof(pkgconf_path_t), 1); node->path = strdup(path); #ifdef PKGCONF_CACHE_INODES if (filter) { node->handle_path = (void *)(intptr_t) st.st_ino; node->handle_device = (void *)(intptr_t) st.st_dev; } #endif pkgconf_node_insert(&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 *envvarname, 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* envvarname: 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 *envvarname, const char *fallback, pkgconf_list_t *dirlist, bool filter) { const char *data; data = getenv(envvarname); 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; char relocated[PKGCONF_ITEM_SIZE]; const char *cpath = path; pkgconf_strlcpy(relocated, path, sizeof relocated); if (pkgconf_path_relocate(relocated, sizeof relocated)) cpath = relocated; PKGCONF_FOREACH_LIST_ENTRY(dirlist->head, n) { pkgconf_path_t *pnode = n->data; if (!strcmp(pnode->path, cpath)) return true; } return false; } /* * !doc * * .. c:function:: void pkgconf_path_copy_list(pkgconf_list_t *dst, const pkgconf_list_t *src) * * Copies a path list to another path list. * * :param pkgconf_list_t* dst: The path list to copy to. * :param pkgconf_list_t* src: The path list to copy from. * :return: nothing */ void pkgconf_path_copy_list(pkgconf_list_t *dst, const pkgconf_list_t *src) { pkgconf_node_t *n; PKGCONF_FOREACH_LIST_ENTRY(src->head, n) { pkgconf_path_t *srcpath = n->data, *path; path = calloc(sizeof(pkgconf_path_t), 1); path->path = strdup(srcpath->path); #ifdef PKGCONF_CACHE_INODES path->handle_path = srcpath->handle_path; path->handle_device = srcpath->handle_device; #endif pkgconf_node_insert_tail(&path->lnode, path, dst); } } /* * !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); } pkgconf_list_zero(dirlist); } static char * normpath(const char *path) { if (!path) return NULL; char *copy = strdup(path); if (NULL == copy) return NULL; char *ptr = copy; for (int ii = 0; copy[ii]; ii++) { *ptr++ = path[ii]; if ('/' == path[ii]) { ii++; while ('/' == path[ii]) ii++; ii--; } } *ptr = '\0'; return copy; } /* * !doc * * .. c:function:: bool pkgconf_path_relocate(char *buf, size_t buflen) * * Relocates a path, possibly calling normpath() on it. * * :param char* buf: The path to relocate. * :param size_t buflen: The buffer length the path is contained in. * :return: true on success, false on error * :rtype: bool */ bool pkgconf_path_relocate(char *buf, size_t buflen) { #ifdef _WIN32 char *ti; #endif char *tmpbuf; if ((tmpbuf = normpath(buf)) != NULL) { size_t tmpbuflen = strlen(tmpbuf); if (tmpbuflen > buflen) { free(tmpbuf); return false; } pkgconf_strlcpy(buf, tmpbuf, buflen); free(tmpbuf); } return true; }