1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299
|
/*
* linklist.c - linked lists
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 1992-1997 Paul Falstad
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Paul Falstad or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Paul Falstad and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Paul Falstad and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Paul Falstad and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
#include "zsh.mdh"
#include "linklist.pro"
/* Get an empty linked list header */
/**/
mod_export LinkList
newlinklist(void)
{
LinkList list;
list = (LinkList) zhalloc(sizeof *list);
list->first = NULL;
list->last = (LinkNode) list;
return list;
}
/**/
mod_export LinkList
znewlinklist(void)
{
LinkList list;
list = (LinkList) zalloc(sizeof *list);
list->first = NULL;
list->last = (LinkNode) list;
return list;
}
/* Insert a node in a linked list after a given node */
/**/
mod_export LinkNode
insertlinknode(LinkList list, LinkNode node, void *dat)
{
LinkNode tmp, new;
tmp = node->next;
node->next = new = (LinkNode) zhalloc(sizeof *tmp);
new->last = node;
new->dat = dat;
new->next = tmp;
if (tmp)
tmp->last = new;
else
list->last = new;
return new;
}
/**/
mod_export LinkNode
zinsertlinknode(LinkList list, LinkNode node, void *dat)
{
LinkNode tmp, new;
tmp = node->next;
node->next = new = (LinkNode) zalloc(sizeof *tmp);
new->last = node;
new->dat = dat;
new->next = tmp;
if (tmp)
tmp->last = new;
else
list->last = new;
return new;
}
/* Insert an already-existing node into a linked list after a given node */
/**/
mod_export LinkNode
uinsertlinknode(LinkList list, LinkNode node, LinkNode new)
{
LinkNode tmp = node->next;
node->next = new;
new->last = node;
new->next = tmp;
if (tmp)
tmp->last = new;
else
list->last = new;
return new;
}
/* Insert a list in another list */
/**/
mod_export void
insertlinklist(LinkList l, LinkNode where, LinkList x)
{
LinkNode nx;
nx = where->next;
if (!l->first)
return;
where->next = l->first;
l->last->next = nx;
l->first->last = where;
if (nx)
nx->last = l->last;
else
x->last = l->last;
}
/* Get top node in a linked list */
/**/
mod_export void *
getlinknode(LinkList list)
{
void *dat;
LinkNode node;
if (!(node = list->first))
return NULL;
dat = node->dat;
list->first = node->next;
if (node->next)
node->next->last = (LinkNode) list;
else
list->last = (LinkNode) list;
zfree(node, sizeof(struct linknode));
return dat;
}
/* Get top node in a linked list without freeing */
/**/
mod_export void *
ugetnode(LinkList list)
{
void *dat;
LinkNode node;
if (!(node = list->first))
return NULL;
dat = node->dat;
list->first = node->next;
if (node->next)
node->next->last = (LinkNode) list;
else
list->last = (LinkNode) list;
return dat;
}
/* Remove a node from a linked list */
/**/
mod_export void *
remnode(LinkList list, LinkNode nd)
{
void *dat;
nd->last->next = nd->next;
if (nd->next)
nd->next->last = nd->last;
else
list->last = nd->last;
dat = nd->dat;
zfree(nd, sizeof(struct linknode));
return dat;
}
/* Remove a node from a linked list without freeing */
/**/
mod_export void *
uremnode(LinkList list, LinkNode nd)
{
void *dat;
nd->last->next = nd->next;
if (nd->next)
nd->next->last = nd->last;
else
list->last = nd->last;
dat = nd->dat;
return dat;
}
/* Free a linked list */
/**/
mod_export void
freelinklist(LinkList list, FreeFunc freefunc)
{
LinkNode node, next;
for (node = list->first; node; node = next) {
next = node->next;
if (freefunc)
freefunc(node->dat);
zfree(node, sizeof(struct linknode));
}
zfree(list, sizeof(struct linklist));
}
/* Count the number of nodes in a linked list */
/**/
mod_export int
countlinknodes(LinkList list)
{
LinkNode nd;
int ct = 0;
for (nd = firstnode(list); nd; incnode(nd), ct++);
return ct;
}
/**/
mod_export void
rolllist(LinkList l, LinkNode nd)
{
l->last->next = l->first;
l->first->last = l->last;
l->first = nd;
l->last = nd->last;
nd->last = (LinkNode) l;
l->last->next = 0;
}
/**/
mod_export LinkList
newsizedlist(int size)
{
LinkList list;
LinkNode node;
list = (LinkList) zhalloc(sizeof(struct linklist) +
(size * sizeof(struct linknode)));
list->first = (LinkNode) (list + 1);
for (node = list->first; size; size--, node++) {
node->last = node - 1;
node->next = node + 1;
}
list->last = node - 1;
list->first->last = (LinkNode) list;
node[-1].next = NULL;
return list;
}
/**/
mod_export int
listcontains(LinkList list, void *dat)
{
LinkNode node;
for (node = firstnode(list); node; incnode(node))
if (getdata(node) == dat)
return 1;
return 0;
}
/**/
mod_export LinkNode
linknodebydatum(LinkList list, void *dat)
{
LinkNode node;
for (node = firstnode(list); node; incnode(node))
if (getdata(node) == dat)
return node;
return NULL;
}
|