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/*
Stack filter
Copyright (C) 2002 Robert Lipe, robertlipe@usa.net
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111 USA
*/
#include <stdio.h>
#include "defs.h"
#define MYNAME "Stack filter"
extern queue waypt_head;
static char *opt_push = NULL;
static char *opt_copy = NULL;
static char *opt_pop = NULL;
static char *opt_append = NULL;
static char *opt_discard = NULL;
static char *opt_replace = NULL;
static char *opt_swap = NULL;
static char *opt_depth = NULL;
static char *nowarn = NULL;
static int warnings_enabled = 1;
static int swapdepth = 0;
static
arglist_t stackfilt_args[] = {
{"push", &opt_push, "Push waypoint list onto stack", NULL,
ARGTYPE_BOOL},
{"copy", &opt_copy, "Copy waypoint list when pushing", NULL,
ARGTYPE_BOOL},
{"pop", &opt_pop, "Pop waypoint list from stack", NULL,
ARGTYPE_BOOL},
{"append", &opt_append, "Append list when popping", NULL,
ARGTYPE_BOOL},
{"discard", &opt_discard, "Discard top of stack when popping",
NULL, ARGTYPE_BOOL},
{"replace", &opt_replace, "Replace list with top of stack (default)",
NULL, ARGTYPE_BOOL},
{"swap", &opt_swap, "Swap waypoint list with <depth> item on stack",
NULL, ARGTYPE_BOOL},
{"depth", &opt_depth, "Item to use when swapping", NULL, ARGTYPE_INT},
{"nowarn", &nowarn, "Suppress cleanup warning", NULL,
ARGTYPE_INT | ARGTYPE_HIDDEN},
{0, 0, 0, 0, 0}
};
struct stack_elt {
queue waypts;
struct stack_elt *next;
} *stack = NULL;
void
stackfilt_process(void)
{
struct stack_elt *tmp_elt = NULL;
queue *elem = NULL;
queue *tmp = NULL;
queue tmp_queue;
waypoint *wpt_tmp;
if ( opt_push ) {
tmp_elt = (struct stack_elt *)xmalloc(sizeof(struct stack_elt));
QUEUE_MOVE(&(tmp_elt->waypts), &waypt_head);
tmp_elt->next = stack;
stack = tmp_elt;
if ( opt_copy ) {
QUEUE_FOR_EACH( &(stack->waypts), elem, tmp ) {
waypt_add( waypt_dupe((waypoint *)elem));
}
}
}
else if ( opt_pop ) {
tmp_elt = stack;
if ( !tmp_elt ) {
fatal( MYNAME ": stack empty\n");
}
if ( opt_append ) {
QUEUE_FOR_EACH( &(stack->waypts), elem, tmp ) {
waypt_add( (waypoint *)elem);
}
}
else if ( opt_discard ) {
waypt_flush( &(stack->waypts) );
}
else {
waypt_flush( &waypt_head );
QUEUE_MOVE(&(waypt_head), &(stack->waypts) );
}
stack = tmp_elt->next;
xfree( tmp_elt );
}
else if ( opt_swap ) {
tmp_elt = stack;
while ( swapdepth > 1 ) {
if ( !tmp_elt->next ) {
fatal (MYNAME ": swap with nonexistent element\n");
}
tmp_elt = tmp_elt->next;
swapdepth--;
}
QUEUE_MOVE(&tmp_queue, &(tmp_elt->waypts) );
QUEUE_MOVE(&(tmp_elt->waypts), &waypt_head );
QUEUE_MOVE(&waypt_head, &tmp_queue );
}
}
void
stackfilt_init(const char *args) {
int invalid = 0;
if ( nowarn ) {
warnings_enabled = 0;
}
if ( opt_depth ) {
swapdepth = atoi( opt_depth );
}
if ( opt_push ) {
if ( opt_pop || opt_append || opt_discard || opt_replace ||
opt_swap || opt_depth ) {
invalid = 1;
}
}
else if ( opt_pop ) {
if ( opt_push || opt_copy || opt_swap || opt_depth ) {
invalid = 1;
}
if ( !!opt_append + !!opt_discard + !!opt_replace > 1 ) {
invalid = 1;
}
}
else if ( opt_swap ) {
if ( opt_push || opt_copy || opt_pop || opt_append ||
opt_discard || opt_replace ) {
invalid = 1;
}
}
else {
invalid = 1;
}
if ( invalid ) {
fatal (MYNAME ": invalid combination of options\n");
}
}
void
stackfilt_deinit(void) {
swapdepth = 0;
}
void
stackfilt_exit( void ) {
struct stack_elt *tmp_elt = NULL;
if ( warnings_enabled && stack ) {
warning( MYNAME " Warning: leftover stack entries; "
"check command line for mistakes\n" );
}
while ( stack ) {
waypt_flush( &(stack->waypts) );
tmp_elt = stack;
stack = stack->next;
xfree(tmp_elt);
}
}
filter_vecs_t stackfilt_vecs = {
stackfilt_init,
stackfilt_process,
stackfilt_deinit,
stackfilt_exit,
stackfilt_args
};
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