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git://xwords.git.sourceforge.net/gitroot/xwords/xwords
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79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/* -*- compile-command: "cd ../wasm && make -j3 MEMDEBUG=TRUE install"; -*- */
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/*
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* Copyright 2021 by Eric House (xwords@eehouse.org). All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <emscripten.h>
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#include <string.h>
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#include <stdlib.h>
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#include "wasmasm.h"
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#include "comtypes.h"
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EM_JS(void, _get_stored_value, (const char* key,
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StringProc proc, void* closure), {
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var result = null;
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var jsKey = UTF8ToString(key);
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var val = localStorage.getItem(jsKey);
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ccallString(proc, closure, val);
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});
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EM_JS(void, set_stored_value, (const char* key, const char* val), {
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var jsKey = UTF8ToString(key);
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var jsVal = UTF8ToString(val);
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var jsString = localStorage.setItem(jsKey, jsVal);
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});
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EM_JS(void, remove_stored_value, (const char* key), {
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var jsKey = UTF8ToString(key);
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var jsString = localStorage.removeItem(jsKey);
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});
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EM_JS(bool, have_stored_value, (const char* key), {
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let jsKey = UTF8ToString(key);
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let jsVal = localStorage.getItem(jsKey);
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let result = null !== jsVal;
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return result;
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});
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typedef struct _ValState {
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void* ptr;
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size_t** len;
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bool success;
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} ValState;
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static void
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onGotVal(void* closure, const char* val)
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{
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if ( !!val ) {
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ValState* vs = (ValState*)closure;
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size_t slen = 1 + strlen(val);
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if ( !!vs->ptr && slen <= **vs->len ) {
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memcpy( vs->ptr, val, slen );
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vs->success = true;
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}
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**vs->len = slen;
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}
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}
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bool
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get_stored_value( const char* key, char out[], size_t* len )
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{
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ValState state = { .ptr = out, .len = &len, .success = false, };
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_get_stored_value( key, onGotVal, &state );
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return state.success;
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}
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