mirror of
https://github.com/0intro/wmii
synced 2024-11-23 22:29:45 +03:00
144 lines
2.1 KiB
C
144 lines
2.1 KiB
C
/* This file is derived from src/lib9p/intmap.c from plan9port */
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/* See LICENCE.p9p for terms of use */
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#include <stdlib.h>
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#include "ixp.h"
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#define USED(v) if(v){}else{}
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struct Intlist {
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unsigned long id;
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void* aux;
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Intlist* link;
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};
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static unsigned long
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hashid(Intmap *map, unsigned long id)
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{
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return id%map->nhash;
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}
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static void
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nop(void *v)
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{
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USED(v);
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}
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void
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initmap(Intmap *m, unsigned long nhash, void *hash)
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{
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m->nhash = nhash;
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m->hash = hash;
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}
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static Intlist**
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llookup(Intmap *map, unsigned long id)
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{
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Intlist **lf;
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for(lf=&map->hash[hashid(map, id)]; *lf; lf=&(*lf)->link)
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if((*lf)->id == id)
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break;
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return lf;
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}
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void
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freemap(Intmap *map, void (*destroy)(void*))
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{
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int i;
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Intlist *p, *nlink;
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if(destroy == nil)
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destroy = nop;
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for(i=0; i<map->nhash; i++){
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for(p=map->hash[i]; p; p=nlink){
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nlink = p->link;
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destroy(p->aux);
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free(p);
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}
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}
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}
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void
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execmap(Intmap *map, void (*run)(void*))
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{
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int i;
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Intlist *p, *nlink;
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for(i=0; i<map->nhash; i++){
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for(p=map->hash[i]; p; p=nlink){
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nlink = p->link;
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run(p->aux);
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}
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}
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}
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void*
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lookupkey(Intmap *map, unsigned long id)
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{
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Intlist *f;
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void *v;
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if((f = *llookup(map, id)))
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v = f->aux;
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else
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v = nil;
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return v;
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}
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void*
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insertkey(Intmap *map, unsigned long id, void *v)
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{
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Intlist *f;
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void *ov;
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unsigned long h;
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if((f = *llookup(map, id))){
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/* no decrement for ov because we're returning it */
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ov = f->aux;
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f->aux = v;
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}else{
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f = cext_emallocz(sizeof(*f));
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f->id = id;
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f->aux = v;
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h = hashid(map, id);
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f->link = map->hash[h];
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map->hash[h] = f;
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ov = nil;
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}
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return ov;
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}
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int
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caninsertkey(Intmap *map, unsigned long id, void *v)
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{
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Intlist *f;
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int rv;
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unsigned long h;
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if(*llookup(map, id))
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rv = 0;
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else{
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f = cext_emallocz(sizeof *f);
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f->id = id;
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f->aux = v;
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h = hashid(map, id);
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f->link = map->hash[h];
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map->hash[h] = f;
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rv = 1;
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}
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return rv;
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}
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void*
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deletekey(Intmap *map, unsigned long id)
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{
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Intlist **lf, *f;
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void *ov;
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if((f = *(lf = llookup(map, id)))){
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ov = f->aux;
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*lf = f->link;
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free(f);
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}else
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ov = nil;
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return ov;
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}
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