1 files changed, 476 insertions, 0 deletions
diff --git a/libpkgconf/tuple.c b/libpkgconf/tuple.c
new file mode 100644
index 000000000000..83f6a479e772
--- /dev/null
+++ b/libpkgconf/tuple.c
@@ -0,0 +1,476 @@
+/*
+ * tuple.c
+ * management of key->value tuples
+ *
+ * Copyright (c) 2011, 2012 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/stdinc.h>
+#include <libpkgconf/libpkgconf.h>
+
+/*
+ * !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, 0);
+}
+
+static pkgconf_tuple_t *
+lookup_global_tuple(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;
+	}
+
+	return NULL;
+}
+
+/*
+ * !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_tuple_t *tuple;
+
+	tuple = lookup_global_tuple(client, key);
+	if (tuple == NULL)
+		return NULL;
+
+	return tuple->value;
+}
+
+/*
+ * !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);
+}
+
+/*
+ * !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
+ */
+void
+pkgconf_tuple_define_global(pkgconf_client_t *client, const char *kv)
+{
+	char *workbuf = strdup(kv);
+	char *value;
+	pkgconf_tuple_t *tuple;
+
+	value = strchr(workbuf, '=');
+	if (value == NULL)
+		goto out;
+
+	*value++ = '\0';
+
+	tuple = pkgconf_tuple_add(client, &client->global_vars, workbuf, value, false, 0);
+	if (tuple != NULL)
+		tuple->flags = PKGCONF_PKG_TUPLEF_OVERRIDE;
+
+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;
+		}
+	}
+}
+
+static char *
+dequote(const char *value)
+{
+	char *buf = calloc(1, (strlen(value) + 1) * 2);
+	char *bptr = buf;
+	const char *i;
+	char quote = 0;
+
+	if (*value == '\'' || *value == '"')
+		quote = *value;
+
+	for (i = value; *i != '\0'; i++)
+	{
+		if (*i == '\\' && quote && *(i + 1) == quote)
+		{
+			i++;
+			*bptr++ = *i;
+		}
+		else if (*i != quote)
+			*bptr++ = *i;
+	}
+
+	return buf;
+}
+
+static const char *
+find_sysroot(const pkgconf_client_t *client, pkgconf_list_t *vars)
+{
+	const char *sysroot_dir;
+
+	sysroot_dir = pkgconf_tuple_find(client, vars, "pc_sysrootdir");
+	if (sysroot_dir == NULL)
+		sysroot_dir = client->sysroot_dir;
+
+	return sysroot_dir;
+}
+
+static bool
+should_rewrite_sysroot(const pkgconf_client_t *client, pkgconf_list_t *vars, const char *buf, unsigned int flags)
+{
+	const char *sysroot_dir;
+
+	if (flags & PKGCONF_PKG_PROPF_UNINSTALLED && !(client->flags & PKGCONF_PKG_PKGF_FDO_SYSROOT_RULES))
+		return false;
+
+	sysroot_dir = find_sysroot(client, vars);
+	if (sysroot_dir == NULL)
+		return false;
+
+	if (*buf != '/')
+		return false;
+
+	if (!strcmp(sysroot_dir, "/"))
+		return false;
+
+	if (strlen(buf) <= strlen(sysroot_dir))
+		return false;
+
+	if (strstr(buf + strlen(sysroot_dir), sysroot_dir) == NULL)
+		return false;
+
+	return true;
+}
+
+/*
+ * !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, unsigned int flags)
+{
+	char *dequote_value;
+	pkgconf_tuple_t *tuple = calloc(1, sizeof(pkgconf_tuple_t));
+
+	pkgconf_tuple_find_delete(list, key);
+
+	dequote_value = dequote(value);
+
+	tuple->key = strdup(key);
+	if (parse)
+		tuple->value = pkgconf_tuple_parse(client, list, dequote_value, flags);
+	else
+		tuple->value = strdup(dequote_value);
+
+	PKGCONF_TRACE(client, "adding tuple to @%p: %s => %s (parsed? %d)", list, key, tuple->value, parse);
+
+	pkgconf_node_insert(&tuple->iter, tuple, list);
+
+	free(dequote_value);
+
+	return tuple;
+}
+
+/*
+ * !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 *
+ */
+char *
+pkgconf_tuple_find(const pkgconf_client_t *client, pkgconf_list_t *list, const char *key)
+{
+	pkgconf_node_t *node;
+	pkgconf_tuple_t *global_tuple;
+
+	global_tuple = lookup_global_tuple(client, key);
+	if (global_tuple != NULL && global_tuple->flags & PKGCONF_PKG_TUPLEF_OVERRIDE)
+		return global_tuple->value;
+
+	PKGCONF_FOREACH_LIST_ENTRY(list->head, node)
+	{
+		pkgconf_tuple_t *tuple = node->data;
+
+		if (!strcmp(tuple->key, key))
+			return tuple->value;
+	}
+
+	if (global_tuple != NULL)
+		return global_tuple->value;
+
+	return NULL;
+}
+
+/*
+ * !doc
+ *
+ * .. c:function:: char *pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const char *value, unsigned int flags)
+ *
+ *    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.
+ *    :param uint flags: Any flags to consider while parsing.
+ *    :return: the variable data with any variables substituted
+ *    :rtype: char *
+ */
+char *
+pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const char *value, unsigned int flags)
+{
+	char buf[PKGCONF_BUFSIZE];
+	const char *ptr;
+	char *bptr = buf;
+
+	if (!(client->flags & PKGCONF_PKG_PKGF_FDO_SYSROOT_RULES) &&
+		(!(flags & PKGCONF_PKG_PROPF_UNINSTALLED) || (client->flags & PKGCONF_PKG_PKGF_PKGCONF1_SYSROOT_RULES)))
+	{
+		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++)
+	{
+		if (*ptr != '$' || (*ptr == '$' && *(ptr + 1) != '{'))
+			*bptr++ = *ptr;
+		else if (*(ptr + 1) == '{')
+		{
+			char varname[PKGCONF_ITEM_SIZE];
+			char *vend = varname + PKGCONF_ITEM_SIZE - 1;
+			char *vptr = varname;
+			const char *pptr;
+			char *kv, *parsekv;
+
+			*vptr = '\0';
+
+			for (pptr = ptr + 2; *pptr != '\0'; pptr++)
+			{
+				if (*pptr != '}')
+				{
+					if (vptr < vend)
+						*vptr++ = *pptr;
+					else
+					{
+						*vptr = '\0';
+						break;
+					}
+				}
+				else
+				{
+					*vptr = '\0';
+					break;
+				}
+			}
+
+			PKGCONF_TRACE(client, "lookup tuple %s", varname);
+
+			size_t remain = PKGCONF_BUFSIZE - (bptr - buf);
+			ptr += (pptr - ptr);
+			kv = pkgconf_tuple_find_global(client, varname);
+			if (kv != NULL)
+			{
+				size_t nlen = pkgconf_strlcpy(bptr, kv, remain);
+				if (nlen > remain)
+				{
+					pkgconf_warn(client, "warning: truncating very long variable to 64KB\n");
+
+					bptr = buf + (PKGCONF_BUFSIZE - 1);
+					break;
+				}
+
+				bptr += nlen;
+			}
+			else
+			{
+				kv = pkgconf_tuple_find(client, vars, varname);
+
+				if (kv != NULL)
+				{
+					size_t nlen;
+
+					parsekv = pkgconf_tuple_parse(client, vars, kv, flags);
+					nlen = pkgconf_strlcpy(bptr, parsekv, remain);
+					free(parsekv);
+
+					if (nlen > remain)
+					{
+						pkgconf_warn(client, "warning: truncating very long variable to 64KB\n");
+
+						bptr = buf + (PKGCONF_BUFSIZE - 1);
+						break;
+					}
+
+					bptr += nlen;
+				}
+			}
+		}
+	}
+
+	*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.
+	 *
+	 * New in 1.9: Only attempt to rewrite the sysroot if we are not processing an uninstalled package.
+	 */
+	if (should_rewrite_sysroot(client, vars, buf, flags))
+	{
+		char cleanpath[PKGCONF_ITEM_SIZE];
+		const char *sysroot_dir = find_sysroot(client, vars);
+
+		pkgconf_strlcpy(cleanpath, buf + strlen(sysroot_dir), sizeof cleanpath);
+		pkgconf_path_relocate(cleanpath, sizeof cleanpath);
+
+		return strdup(cleanpath);
+	}
+
+	return strdup(buf);
+}
+
+/*
+ * !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);
+}
+
+/*
+ * !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
+ */
+void
+pkgconf_tuple_free(pkgconf_list_t *list)
+{
+	pkgconf_node_t *node, *next;
+
+	PKGCONF_FOREACH_LIST_ENTRY_SAFE(list->head, next, node)
+		pkgconf_tuple_free_entry(node->data, list);
+
+	pkgconf_list_zero(list);
+}