Aegisub/vendor/csri/lib/list.c

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/*****************************************************************************
* asa: portable digital subtitle renderer
*****************************************************************************
* Copyright (C) 2007 David Lamparter
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
****************************************************************************/
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "csrilib.h"
struct csri_wrap_rend *wraprends = NULL;
struct csri_wrap_rend *csrilib_rend_lookup(csri_rend *rend)
{
struct csri_wrap_rend *wrap = wraprends;
for (; wrap; wrap = wrap->next)
if (wrap->rend == rend)
return wrap;
return NULL;
}
#define INSTHASHSZ 256
#define HASH(x) (((intptr_t)(x) & 0xff00) >> 8)
static struct csri_wrap_inst *wrapinsts[INSTHASHSZ];
struct csri_wrap_inst *csrilib_inst_lookup(csri_inst *inst)
{
struct csri_wrap_inst *ent = wrapinsts[HASH(inst)];
while (ent && ent->inst != inst)
ent = ent->next;
return ent;
}
csri_inst *csrilib_inst_initadd(struct csri_wrap_rend *wrend,
csri_inst *inst)
{
struct csri_wrap_inst *winst = (struct csri_wrap_inst *)
malloc(sizeof(struct csri_wrap_inst)),
**pnext;
if (!winst) {
wrend->close(inst);
return NULL;
}
winst->wrend = wrend;
winst->inst = inst;
winst->close = wrend->close;
winst->request_fmt = wrend->request_fmt;
winst->render = wrend->render;
winst->next = NULL;
pnext = &wrapinsts[HASH(inst)];
while (*pnext)
pnext = &(*pnext)->next;
*pnext = winst;
return inst;
}
void csrilib_inst_remove(struct csri_wrap_inst *winst)
{
struct csri_wrap_inst **pnext = &wrapinsts[HASH(winst->inst)];
while (*pnext && *pnext != winst)
pnext = &(*pnext)->next;
if (!*pnext)
return;
*pnext = (*pnext)->next;
free(winst);
}
void csrilib_rend_initadd(struct csri_wrap_rend *wrend)
{
wrend->next = wraprends;
wraprends = wrend;
}
static int initialized = 0;
csri_rend *csri_renderer_default()
{
if (!initialized) {
csrilib_os_init();
initialized = 1;
}
if (!wraprends)
return NULL;
return wraprends->rend;
}
csri_rend *csri_renderer_next(csri_rend *prev)
{
struct csri_wrap_rend *wrend = csrilib_rend_lookup(prev);
if (!wrend || !wrend->next)
return NULL;
return wrend->next->rend;
}
csri_rend *csri_renderer_byname(const char *name, const char *specific)
{
struct csri_wrap_rend *wrend;
if (!initialized) {
csrilib_os_init();
initialized = 1;
}
if (!name)
return NULL;
for (wrend = wraprends; wrend; wrend = wrend->next) {
if (strcmp(wrend->info->name, name))
continue;
if (specific && strcmp(wrend->info->specific, specific))
continue;
return wrend->rend;
}
return NULL;
}
csri_rend *csri_renderer_byext(unsigned n_ext, csri_ext_id *ext)
{
struct csri_wrap_rend *wrend;
unsigned i;
if (!initialized) {
csrilib_os_init();
initialized = 1;
}
for (wrend = wraprends; wrend; wrend = wrend->next) {
for (i = 0; i < n_ext; i++) {
if (!wrend->query_ext(wrend->rend, ext[i]))
break;
}
if (i == n_ext)
return wrend->rend;
}
return NULL;
}