pkgconf/libpkgconf/tuple.c

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/*
* tuple.c
* management of key->value tuples
*
* Copyright (c) 2011, 2012 pkgconf authors (see AUTHORS).
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*
* 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.
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*/
#include <libpkgconf/stdinc.h>
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#include <libpkgconf/libpkgconf.h>
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/*
* !doc
*
* libpkgconf `tuple` module
* =========================
*
* The `tuple` module provides key-value mappings backed by a linked list. The key-value
* mapping is mainly used for variable substitution when parsing .pc files.
*
* There are two sets of mappings: a ``pkgconf_pkg_t`` specific mapping, and a `global` mapping.
* The `tuple` module provides convenience wrappers for managing the `global` mapping, which is
* attached to a given client object.
*/
/*
* !doc
*
* .. c:function:: void pkgconf_tuple_add_global(pkgconf_client_t *client, const char *key, const char *value)
*
* Defines a global variable, replacing the previous declaration if one was set.
*
* :param pkgconf_client_t* client: The pkgconf client object to modify.
* :param char* key: The key for the mapping (variable name).
* :param char* value: The value for the mapped entry.
* :return: nothing
*/
void
pkgconf_tuple_add_global(pkgconf_client_t *client, const char *key, const char *value)
{
pkgconf_tuple_add(client, &client->global_vars, key, value, false);
}
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/*
* !doc
*
* .. c:function:: void pkgconf_tuple_find_global(const pkgconf_client_t *client, const char *key)
*
* Looks up a global variable.
*
* :param pkgconf_client_t* client: The pkgconf client object to access.
* :param char* key: The key or variable name to look up.
* :return: the contents of the variable or ``NULL``
* :rtype: char *
*/
char *
pkgconf_tuple_find_global(const pkgconf_client_t *client, const char *key)
{
pkgconf_node_t *node;
PKGCONF_FOREACH_LIST_ENTRY(client->global_vars.head, node)
{
pkgconf_tuple_t *tuple = node->data;
if (!strcmp(tuple->key, key))
return tuple->value;
}
return NULL;
}
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/*
* !doc
*
* .. c:function:: void pkgconf_tuple_free_global(pkgconf_client_t *client)
*
* Delete all global variables associated with a pkgconf client object.
*
* :param pkgconf_client_t* client: The pkgconf client object to modify.
* :return: nothing
*/
void
pkgconf_tuple_free_global(pkgconf_client_t *client)
{
pkgconf_tuple_free(&client->global_vars);
}
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/*
* !doc
*
* .. c:function:: void pkgconf_tuple_define_global(pkgconf_client_t *client, const char *kv)
*
* Parse and define a global variable.
*
* :param pkgconf_client_t* client: The pkgconf client object to modify.
* :param char* kv: The variable in the form of ``key=value``.
* :return: nothing
*/
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void
pkgconf_tuple_define_global(pkgconf_client_t *client, const char *kv)
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{
char *workbuf = strdup(kv);
char *value;
value = strchr(workbuf, '=');
if (value == NULL)
goto out;
*value++ = '\0';
pkgconf_tuple_add_global(client, workbuf, value);
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out:
free(workbuf);
}
static void
pkgconf_tuple_find_delete(pkgconf_list_t *list, const char *key)
{
pkgconf_node_t *node, *next;
PKGCONF_FOREACH_LIST_ENTRY_SAFE(list->head, next, node)
{
pkgconf_tuple_t *tuple = node->data;
if (!strcmp(tuple->key, key))
{
pkgconf_tuple_free_entry(tuple, list);
return;
}
}
}
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/*
* !doc
*
* .. c:function:: pkgconf_tuple_t *pkgconf_tuple_add(const pkgconf_client_t *client, pkgconf_list_t *list, const char *key, const char *value, bool parse)
*
* Optionally parse and then define a variable.
*
* :param pkgconf_client_t* client: The pkgconf client object to access.
* :param pkgconf_list_t* list: The variable list to add the new variable to.
* :param char* key: The name of the variable being added.
* :param char* value: The value of the variable being added.
* :param bool parse: Whether or not to parse the value for variable substitution.
* :return: a variable object
* :rtype: pkgconf_tuple_t *
*/
pkgconf_tuple_t *
pkgconf_tuple_add(const pkgconf_client_t *client, pkgconf_list_t *list, const char *key, const char *value, bool parse)
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{
pkgconf_tuple_t *tuple = calloc(sizeof(pkgconf_tuple_t), 1);
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pkgconf_tuple_find_delete(list, key);
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tuple->key = strdup(key);
if (parse)
tuple->value = pkgconf_tuple_parse(client, list, value);
else
tuple->value = strdup(value);
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pkgconf_node_insert(&tuple->iter, tuple, list);
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return tuple;
}
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/*
* !doc
*
* .. c:function:: char *pkgconf_tuple_find(const pkgconf_client_t *client, pkgconf_list_t *list, const char *key)
*
* Look up a variable in a variable list.
*
* :param pkgconf_client_t* client: The pkgconf client object to access.
* :param pkgconf_list_t* list: The variable list to search.
* :param char* key: The variable name to search for.
* :return: the value of the variable or ``NULL``
* :rtype: char *
*/
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char *
pkgconf_tuple_find(const pkgconf_client_t *client, pkgconf_list_t *list, const char *key)
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{
pkgconf_node_t *node;
char *res;
if ((res = pkgconf_tuple_find_global(client, key)) != NULL)
return res;
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PKGCONF_FOREACH_LIST_ENTRY(list->head, node)
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{
pkgconf_tuple_t *tuple = node->data;
if (!strcmp(tuple->key, key))
return tuple->value;
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}
return NULL;
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}
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/*
* !doc
*
* .. c:function:: char *pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const char *value)
*
* Parse an expression for variable substitution.
*
* :param pkgconf_client_t* client: The pkgconf client object to access.
* :param pkgconf_list_t* list: The variable list to search for variables (along side the global variable list).
* :param char* value: The ``key=value`` string to parse.
* :return: the variable data with any variables substituted
* :rtype: char *
*/
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char *
pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const char *value)
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{
char buf[PKGCONF_BUFSIZE];
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const char *ptr;
char *bptr = buf;
if (*value == '/' && client->sysroot_dir != NULL && strncmp(value, client->sysroot_dir, strlen(client->sysroot_dir)))
bptr += pkgconf_strlcpy(buf, client->sysroot_dir, sizeof buf);
for (ptr = value; *ptr != '\0' && bptr - buf < PKGCONF_BUFSIZE; ptr++)
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{
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if (*ptr != '$' || (*ptr == '$' && *(ptr + 1) != '{'))
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*bptr++ = *ptr;
else if (*(ptr + 1) == '{')
{
char varname[PKGCONF_BUFSIZE];
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char *vptr = varname;
const char *pptr;
char *kv, *parsekv;
*vptr = '\0';
for (pptr = ptr + 2; *pptr != '\0'; pptr++)
{
if (*pptr != '}')
*vptr++ = *pptr;
else
{
*vptr = '\0';
break;
}
}
ptr += (pptr - ptr);
kv = pkgconf_tuple_find_global(client, varname);
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if (kv != NULL)
{
strncpy(bptr, kv, PKGCONF_BUFSIZE - (bptr - buf));
bptr += strlen(kv);
}
else
{
kv = pkgconf_tuple_find(client, vars, varname);
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if (kv != NULL)
{
parsekv = pkgconf_tuple_parse(client, vars, kv);
strncpy(bptr, parsekv, PKGCONF_BUFSIZE - (bptr - buf));
bptr += strlen(parsekv);
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free(parsekv);
}
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}
}
}
*bptr = '\0';
/*
* Sigh. Somebody actually attempted to use freedesktop.org pkg-config's broken sysroot support,
* which was written by somebody who did not understand how sysroots are supposed to work. This
* results in an incorrect path being built as the sysroot will be prepended twice, once explicitly,
* and once by variable expansion (the pkgconf approach). We could simply make ${pc_sysrootdir} blank,
* but sometimes it is necessary to know the explicit sysroot path for other reasons, so we can't really
* do that.
*
* As a result, we check to see if ${pc_sysrootdir} is prepended as a duplicate, and if so, remove the
* prepend. This allows us to handle both our approach and the broken freedesktop.org implementation's
* approach. Because a path can be shorter than ${pc_sysrootdir}, we do some checks first to ensure it's
* safe to skip ahead in the string to scan for our sysroot dir.
*
* Finally, we call pkgconf_path_relocate() to clean the path of spurious elements.
*/
if (*buf == '/' &&
client->sysroot_dir != NULL &&
strlen(buf) > strlen(client->sysroot_dir) &&
strstr(buf + strlen(client->sysroot_dir), client->sysroot_dir) != NULL)
{
char cleanpath[PKGCONF_BUFSIZE];
pkgconf_strlcpy(cleanpath, buf + strlen(client->sysroot_dir), sizeof cleanpath);
pkgconf_path_relocate(cleanpath, sizeof cleanpath);
return strdup(cleanpath);
}
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return strdup(buf);
}
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/*
* !doc
*
* .. c:function:: void pkgconf_tuple_free_entry(pkgconf_tuple_t *tuple, pkgconf_list_t *list)
*
* Deletes a variable object, removing it from any variable lists and releasing any memory associated
* with it.
*
* :param pkgconf_tuple_t* tuple: The variable object to release.
* :param pkgconf_list_t* list: The variable list the variable object is attached to.
* :return: nothing
*/
void
pkgconf_tuple_free_entry(pkgconf_tuple_t *tuple, pkgconf_list_t *list)
{
pkgconf_node_delete(&tuple->iter, list);
free(tuple->key);
free(tuple->value);
free(tuple);
}
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/*
* !doc
*
* .. c:function:: void pkgconf_tuple_free(pkgconf_list_t *list)
*
* Deletes a variable list and any variables attached to it.
*
* :param pkgconf_list_t* list: The variable list to delete.
* :return: nothing
*/
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void
pkgconf_tuple_free(pkgconf_list_t *list)
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{
pkgconf_node_t *node, *next;
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PKGCONF_FOREACH_LIST_ENTRY_SAFE(list->head, next, node)
pkgconf_tuple_free_entry(node->data, list);
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}