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#include "headers.h"
#define INITIALCHUNKSIZE 10
typedef struct Entry {
void *p;
long freechain;
} Entry;
struct SmbIdMap {
Entry *array;
ulong entries;
long freeindex;
};
SmbIdMap *
smbidmapnew(void)
{
SmbIdMap *m;
m = smbemallocz(sizeof(SmbIdMap), 1);
m->freeindex = -1;
return m;
}
void
smbidmapremovebyid(SmbIdMap *m, long id)
{
if (m == nil)
return;
assert(id > 0);
id--;
assert(id >= 0 && id < m->entries);
assert(m->array[id].freechain == -2);
m->array[id].freechain = m->freeindex;
m->freeindex = id;
}
void
smbidmapremove(SmbIdMap *m, void *thing)
{
long id;
if (m == nil)
return;
id = *(long *)thing;
smbidmapremovebyid(m, id);
}
void
smbidmapremoveif(SmbIdMap *m, int (*f)(void *p, void *arg), void *arg)
{
int i;
if (m == nil)
return;
for (i = 0; i < m->entries; i++)
if (m->array[i].freechain == -2 && (*f)(m->array[i].p, arg))
smbidmapremovebyid(m, i + 1);
}
static void
grow(SmbIdMap *m)
{
long x;
long oldentries = m->entries;
if (m->entries == 0)
m->entries = INITIALCHUNKSIZE;
else
m->entries *= 2;
smberealloc(&m->array, sizeof(Entry) * m->entries);
for (x = m->entries - 1; x >= oldentries; x--) {
m->array[x].freechain = m->freeindex;
m->freeindex = x;
}
}
long
smbidmapadd(SmbIdMap *m, void *p)
{
long i;
if (m->freeindex < 0)
grow(m);
i = m->freeindex;
m->freeindex = m->array[i].freechain;
m->array[i].freechain = -2;
m->array[i].p = p;
*(long *)p = i + 1;
return i + 1;
}
void *
smbidmapfind(SmbIdMap *m, long id)
{
if (m == nil)
return nil;
if (id <= 0)
return nil;
id--;
if (id < 0 || id > m->entries || m->array[id].freechain != -2)
return nil;
return m->array[id].p;
}
void
smbidmapfree(SmbIdMap **mp, SMBIDMAPAPPLYFN *freefn, void *magic)
{
SmbIdMap *m = *mp;
if (m) {
long i;
if (freefn) {
for (i = 0; i < m->entries; i++)
if (m->array[i].freechain == -2)
(*freefn)(magic, m->array[i].p);
}
free(m->array);
free(m);
*mp = nil;
}
}
void
smbidmapapply(SmbIdMap *m, SMBIDMAPAPPLYFN *applyfn, void *magic)
{
if (m) {
long i;
for (i = 0; i < m->entries; i++)
if (m->array[i].freechain == -2)
(*applyfn)(magic, m->array[i].p);
}
}
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