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// Copyright 2016 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <emscripten/emscripten.h>
void create_file()
{
FILE *file = fopen("hello_file.txt", "wb");
assert(file);
const char *data = "Hello world";
const char *data2 = "da";
const char *data3 = "ta!";
fwrite(data, 1, strlen(data), file);
fseek(file, 8, SEEK_SET);
fwrite(data3, 1, strlen(data3), file);
fseek(file, 6, SEEK_SET);
fwrite(data2, 1, strlen(data2), file);
fclose(file);
}
void read_file()
{
FILE *file = fopen("hello_file.txt", "rb");
char buffer[128] = {};
size_t read = fread(buffer, 1, sizeof(buffer), file);
printf("read %u bytes. Result: %s\n", (unsigned int)read, buffer);
assert(read == strlen("Hello data!"));
assert(!strcmp(buffer, "Hello data!"));
}
int main()
{
create_file();
read_file();
return 0;
}
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