tildefriends/deps/quickjs/examples/fib.c

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/*
* QuickJS: Example of C module
*
* Copyright (c) 2017-2018 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "../quickjs.h"
#define countof(x) (sizeof(x) / sizeof((x)[0]))
static int fib(int n)
{
if (n <= 0)
return 0;
else if (n == 1)
return 1;
else
return fib(n - 1) + fib(n - 2);
}
static JSValue js_fib(JSContext *ctx, JSValueConst this_val,
int argc, JSValueConst *argv)
{
int n, res;
if (JS_ToInt32(ctx, &n, argv[0]))
return JS_EXCEPTION;
res = fib(n);
return JS_NewInt32(ctx, res);
}
static const JSCFunctionListEntry js_fib_funcs[] = {
JS_CFUNC_DEF("fib", 1, js_fib ),
};
static int js_fib_init(JSContext *ctx, JSModuleDef *m)
{
return JS_SetModuleExportList(ctx, m, js_fib_funcs,
countof(js_fib_funcs));
}
#ifdef JS_SHARED_LIBRARY
#define JS_INIT_MODULE js_init_module
#else
#define JS_INIT_MODULE js_init_module_fib
#endif
JSModuleDef *JS_INIT_MODULE(JSContext *ctx, const char *module_name)
{
JSModuleDef *m;
m = JS_NewCModule(ctx, module_name, js_fib_init);
if (!m)
return NULL;
JS_AddModuleExportList(ctx, m, js_fib_funcs, countof(js_fib_funcs));
return m;
}