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/* This file is part of the Project Athena Zephyr Notification System.
* It is one of the source files comprising zwgc, the Zephyr WindowGram
* client.
*
* Created by: Marc Horowitz <marc@athena.mit.edu>
*
* $Source$
* $Author$
*
* Copyright (c) 1989 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#if (!defined(lint) && !defined(SABER))
static char rcsid_xrevstack_c[] = "$Header$";
#endif
#include <zephyr/mit-copyright.h>
#include "X_gram.h"
#include "zwgc.h"
#include <stdio.h>
x_gram *bottom_gram=NULL;
static x_gram *top_gram=NULL;
#ifdef DEBUG
void print_gram_list(str)
char *str;
{
x_gram *gram;
char buf[80];
if (zwgc_debug) {
printf("----- From function %s: Top of tree\n",str);
if (top_gram)
if (top_gram->above)
printf("Tree munged: something above top_gram\n");
for (gram=top_gram;gram;gram=gram->below) {
strncpy(buf,gram->text,63);
buf[63]='\0';
printf("wid %lx txt: %s\n",(long) gram->w,buf);
}
if (bottom_gram)
if (bottom_gram->below)
printf("Tree munged: something below bottom_gram\n");
printf("----- Bottom of tree\n");
}
}
#endif
void pull_to_top(gram)
x_gram *gram;
{
if (gram==top_gram) {
/* already here */
return;
} else if (top_gram==NULL) {
/* no grams at all. Make gram both top and bottom */
top_gram=gram;
bottom_gram=gram;
} else if (gram==bottom_gram) {
/* bottom gram is special case */
bottom_gram=bottom_gram->above;
bottom_gram->below=NULL;
top_gram->above=gram;
gram->below=top_gram;
top_gram=gram;
} else {
/* normal case of a gram in the middle */
gram->above->below=gram->below;
gram->below->above=gram->above;
top_gram->above=gram;
gram->below=top_gram;
gram->above=NULL;
top_gram=gram;
}
#ifdef DEBUG
print_gram_list("pull_to_top");
#endif
}
void push_to_bottom(gram)
x_gram *gram;
{
if (gram==bottom_gram) {
/* already here */
return;
} else if (bottom_gram==NULL) {
/* no grams at all. Make gram both top and bottom */
gram->above=NULL;
gram->below=NULL;
top_gram=gram;
bottom_gram=gram;
} else if (gram==top_gram) {
/* top gram is special case */
top_gram=top_gram->below;
top_gram->above=NULL;
bottom_gram->below=gram;
gram->above=bottom_gram;
bottom_gram=gram;
} else {
/* normal case of a gram in the middle */
gram->above->below=gram->below;
gram->below->above=gram->above;
bottom_gram->below=gram;
gram->above=bottom_gram;
gram->below=NULL;
bottom_gram=gram;
}
#ifdef DEBUG
print_gram_list("push_to_bottom");
#endif
}
void unlink_gram(gram)
x_gram *gram;
{
if (top_gram==bottom_gram) {
/* the only gram in the stack */
top_gram=NULL;
bottom_gram=NULL;
} else if (gram==top_gram) {
top_gram=gram->below;
top_gram->above=NULL;
} else if (gram==bottom_gram) {
bottom_gram=gram->above;
bottom_gram->below=NULL;
} else {
gram->above->below=gram->below;
gram->below->above=gram->above;
}
#ifdef DEBUG
print_gram_list("unlink_gram");
#endif
}
#ifdef notdef
void add_to_top(gram)
x_gram *gram;
{
if (top_gram==NULL) {
gram->above=NULL;
gram->below=NULL;
top_gram=gram;
bottom_gram=gram;
} else {
top_gram->above=gram;
gram->above=NULL;
gram->below=top_gram;
top_gram=gram;
}
#ifdef DEBUG
print_gram_list("add_to_top");
#endif
}
#endif
void add_to_bottom(gram)
x_gram *gram;
{
if (bottom_gram==NULL) {
gram->above=NULL;
gram->below=NULL;
top_gram=gram;
bottom_gram=gram;
} else {
bottom_gram->below=gram;
gram->above=bottom_gram;
gram->below=NULL;
bottom_gram=gram;
}
#ifdef DEBUG
print_gram_list("add_to_bottom");
#endif
}
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