wasm-micro-runtime/samples/basic/wasm-apps/testapp.c

/*
 * Copyright (C) 2019 Intel Corporation.  All rights reserved.
 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

int intToStr(int x, char* str, int str_len, int digit);
int get_pow(int x, int y);
int32_t calculate_native(int32_t n, int32_t func1, int32_t func2);

//
// Primitive parameters functions
//
float generate_float(int iteration, double seed1, float seed2)
{
    float ret;

    printf ("calling into WASM function: %s\n", __FUNCTION__);

    for (int i=0; i<iteration; i++){
        ret += 1.0f/seed1 + seed2;
    }

    return ret;
}

// Converts a floating-point/double number to a string.
// intToStr() is implemented outside wasm app
void float_to_string(float n, char* res, int res_size, int afterpoint)
{

    printf ("calling into WASM function: %s\n", __FUNCTION__);

    // Extract integer part
    int ipart = (int)n;

    // Extract floating part
    float fpart = n - (float)ipart;

    // convert integer part to string
    int i = intToStr(ipart, res, res_size, 0);

    // check for display option after point
    if (afterpoint != 0) {
        res[i] = '.'; // add dot

        // Get the value of fraction part upto given no.
        // of points after dot. The third parameter
        // is needed to handle cases like 233.007
        fpart = fpart * get_pow(10, afterpoint);

        intToStr((int)fpart, res + i + 1, sizeof(res + i + 1), afterpoint);
    }
}

int32_t mul7(int32_t n)
{
    printf ("calling into WASM function: %s,", __FUNCTION__);
    n = n * 7;
    printf ("    %s return %d \n", __FUNCTION__, n);
    return n;
}

int32_t mul5(int32_t n)
{
    printf ("calling into WASM function: %s,", __FUNCTION__);
    n = n * 5;
    printf ("    %s return %d \n", __FUNCTION__, n);
    return n;
}

int32_t calculate(int32_t n)
{
    printf ("calling into WASM function: %s\n", __FUNCTION__);
    int32_t (*f1)(int32_t) = &mul5;
    int32_t (*f2)(int32_t) = &mul7;
    return calculate_native(n, (uint32_t)f1, (uint32_t)f2);
}