pkgconf/libpkgconf/path.c

217 lines
5.5 KiB
C

/*
* 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 (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;
#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
if (filter) {
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);
}
}