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/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
*/
#include "sieve-common.h"
#include "sieve-code.h"
#include "sieve-extensions.h"
#include "sieve-commands.h"
#include "sieve-validator.h"
#include "sieve-generator.h"
#include "sieve-interpreter.h"
#include "sieve-binary.h"
#include "sieve-dump.h"
#include "ext-mime-common.h"
#include <ctype.h>
/* break
*
* Syntax:
* break [":name" <name: string>]
*
*/
static bool cmd_break_registered
(struct sieve_validator *valdtr, const struct sieve_extension *ext,
struct sieve_command_registration *cmd_reg);
static bool cmd_break_pre_validate
(struct sieve_validator *valdtr, struct sieve_command *cmd);
static bool cmd_break_validate
(struct sieve_validator *valdtr, struct sieve_command *cmd);
static bool cmd_break_generate
(const struct sieve_codegen_env *cgenv,
struct sieve_command *ctx);
const struct sieve_command_def cmd_break = {
.identifier = "break",
.type = SCT_COMMAND,
.positional_args = 0,
.subtests = 0,
.block_allowed = FALSE,
.block_required = FALSE,
.registered = cmd_break_registered,
.pre_validate = cmd_break_pre_validate,
.validate = cmd_break_validate,
.generate = cmd_break_generate,
};
/*
* Tagged arguments
*/
/* Forward declarations */
static bool cmd_break_validate_name_tag
(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
struct sieve_command *cmd);
/* Argument objects */
static const struct sieve_argument_def break_name_tag = {
.identifier = "name",
.validate = cmd_break_validate_name_tag
};
/*
* Break operation
*/
static bool cmd_break_operation_dump
(const struct sieve_dumptime_env *denv, sieve_size_t *address);
static int cmd_break_operation_execute
(const struct sieve_runtime_env *renv, sieve_size_t *address);
const struct sieve_operation_def break_operation = {
.mnemonic = "BREAK",
.ext_def = &foreverypart_extension,
.code = EXT_FOREVERYPART_OPERATION_BREAK,
.dump = cmd_break_operation_dump,
.execute = cmd_break_operation_execute
};
/*
* Validation data
*/
struct cmd_break_data {
struct sieve_ast_argument *name;
struct sieve_command *loop_cmd;
};
/*
* Tag validation
*/
static bool cmd_break_validate_name_tag
(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
struct sieve_command *cmd)
{
struct cmd_break_data *data =
(struct cmd_break_data *)cmd->data;
struct sieve_ast_argument *tag = *arg;
/* Detach the tag itself */
*arg = sieve_ast_arguments_detach(*arg, 1);
/* Check syntax:
* :name <string>
*/
if ( !sieve_validate_tag_parameter
(valdtr, cmd, tag, *arg, NULL, 0, SAAT_STRING, TRUE) )
return FALSE;
data->name = *arg;
/* Skip parameter */
*arg = sieve_ast_argument_next(*arg);
return TRUE;
}
/*
* Command registration
*/
static bool cmd_break_registered
(struct sieve_validator *valdtr, const struct sieve_extension *ext,
struct sieve_command_registration *cmd_reg)
{
sieve_validator_register_tag
(valdtr, cmd_reg, ext, &break_name_tag, 0);
return TRUE;
}
/*
* Command validation
*/
static bool cmd_break_pre_validate
(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *cmd)
{
struct cmd_break_data *data;
pool_t pool = sieve_command_pool(cmd);
data = p_new(pool, struct cmd_break_data, 1);
cmd->data = data;
return TRUE;
}
static bool cmd_break_validate
(struct sieve_validator *valdtr, struct sieve_command *cmd)
{
struct cmd_break_data *data =
(struct cmd_break_data *)cmd->data;
struct sieve_ast_node *node = cmd->ast_node;
const char *name = ( data->name == NULL ?
NULL : sieve_ast_argument_strc(data->name) );
i_assert(node != NULL);
while ( node != NULL && node->command != NULL ) {
if ( sieve_command_is(node->command, cmd_foreverypart) ) {
struct ext_foreverypart_loop *loop =
(struct ext_foreverypart_loop *)node->command->data;
if ( name == NULL ||
(name != NULL && loop->name != NULL &&
strcmp(name, loop->name) == 0) ) {
data->loop_cmd = node->command;
break;
}
}
node = sieve_ast_node_parent(node);
}
if ( data->loop_cmd == NULL ) {
if ( name == NULL ) {
sieve_command_validate_error(valdtr, cmd,
"the break command is not placed inside "
"a foreverypart loop");
} else {
sieve_command_validate_error(valdtr, cmd,
"the break command is not placed inside "
"a foreverypart loop named `%s'",
name);
}
return FALSE;
}
sieve_command_exit_block_unconditionally(cmd);
return TRUE;
}
/*
* Code generation
*/
static bool cmd_break_generate
(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
{
struct cmd_break_data *data =
(struct cmd_break_data *)cmd->data;
struct ext_foreverypart_loop *loop;
i_assert( data->loop_cmd != NULL );
loop = (struct ext_foreverypart_loop *)data->loop_cmd->data;
sieve_operation_emit(cgenv->sblock, cmd->ext, &break_operation);
sieve_jumplist_add(loop->exit_jumps,
sieve_binary_emit_offset(cgenv->sblock, 0));
return TRUE;
}
/*
* Code dump
*/
static bool cmd_break_operation_dump
(const struct sieve_dumptime_env *denv, sieve_size_t *address)
{
unsigned int pc = *address;
sieve_offset_t offset;
sieve_code_dumpf(denv, "BREAK");
sieve_code_descend(denv);
if ( !sieve_binary_read_offset(denv->sblock, address, &offset) )
return FALSE;
sieve_code_dumpf(denv, "END: %d [%08x]", offset, pc + offset);
return TRUE;
}
/*
* Code execution
*/
static int cmd_break_operation_execute
(const struct sieve_runtime_env *renv, sieve_size_t *address)
{
struct sieve_interpreter_loop *loop;
unsigned int pc = *address;
sieve_offset_t offset;
sieve_size_t loop_end;
/*
* Read operands
*/
if ( !sieve_binary_read_offset(renv->sblock, address, &offset) )
{
sieve_runtime_trace_error(renv, "invalid loop end offset");
return SIEVE_EXEC_BIN_CORRUPT;
}
loop_end = pc + offset;
/*
* Perform operation
*/
sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS, "break command");
sieve_runtime_trace_descend(renv);
loop = sieve_interpreter_loop_get
(renv->interp, loop_end, &foreverypart_extension);
if ( loop == NULL ) {
sieve_runtime_trace_error(renv, "no matching loop found");
return SIEVE_EXEC_BIN_CORRUPT;
}
sieve_interpreter_loop_break(renv->interp, loop);
return SIEVE_EXEC_OK;
}
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