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