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‎README.md

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Source code for the webvm.io webpage.
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Please use github.com/webvm/issues to signal any bug.
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This project depends on xterm.js (https://xtermjs.org/) and on its add-on xterm-addon-fit
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To update the xterm-related files do:
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```
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mkdir build
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cd build
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npm install --save xterm
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npm install --save xterm-addon-fit
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cd ../xterm
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cp ../build/node_modules/xterm/lib/xterm.js .
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cp ../build/node_modules/xterm/css/xterm.css .
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cp ../build/node_modules/xterm-addon-fit/lib/xterm-addon-fit.js .
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cd ..
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rm -r build
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```

‎assets/webvm.jpeg

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‎examples/c/Makefile

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SRCS = $(wildcard *.c)
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PROGS = $(patsubst %.c,%,$(SRCS))
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all: $(PROGS)
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%: %.c
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$(CC) $(CFLAGS) -o $@ $<
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clean:
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rm -f $(PROGS)
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.PHONY: all clean

‎examples/c/env.c

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#include <stdio.h>
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// Most of the C compilers support a third parameter to main which
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// store all envorinment variables
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int main(int argc, char *argv[], char * envp[])
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{
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int i;
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for (i = 0; envp[i] != NULL; i++)
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printf("\n%s", envp[i]);
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getchar();
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return 0;
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}

‎examples/c/helloworld.c

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#include <stdio.h>
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int main()
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{
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printf("Hello, World!\n");
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}

‎examples/c/link.c

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#include <unistd.h>
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int main()
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{
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link("env", "env3");
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return 0;
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}

‎examples/c/openat.c

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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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int main()
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{
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int ret = openat(AT_FDCWD, "/dev/tty", 0x88102, 0);
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printf("return value is %d and errno is %d\n", ret, errno);
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}
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‎examples/c/waitpid.c

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#include <sys/wait.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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int main()
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{
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int status;
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pid_t p = getpid();
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// waitpid takes a children's pid, not the current process one
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// if the pid is not a children of the current process, it returns -ECHILD
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pid_t res = waitpid(1001, &status, WNOHANG);
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printf("res is %d, p is %d and errno is %d\n", res, p, errno);
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}

‎examples/lua/fizzbuzz.lua

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#!/usr/bin/env luajit
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cfizz,cbuzz=0,0
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for i=1,20 do
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cfizz=cfizz+1
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cbuzz=cbuzz+1
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io.write(i .. ": ")
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if cfizz~=3 and cbuzz~=5 then
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io.write(i)
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else
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if cfizz==3 then
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io.write("Fizz")
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cfizz=0
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end
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if cbuzz==5 then
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io.write("Buzz")
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cbuzz=0
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end
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end
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io.write("\n")
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end

‎examples/lua/sorting.lua

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fruits = {"banana","orange","apple","grapes"}
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for k,v in ipairs(fruits) do
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print(k,v)
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end
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table.sort(fruits)
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print("sorted table")
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for k,v in ipairs(fruits) do
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print(k,v)
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end

‎examples/lua/symmetric_difference.lua

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A = { ["John"] = true, ["Bob"] = true, ["Mary"] = true, ["Elena"] = true }
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B = { ["Jim"] = true, ["Mary"] = true, ["John"] = true, ["Bob"] = true }
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A_B = {}
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for a in pairs(A) do
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if not B[a] then A_B[a] = true end
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end
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B_A = {}
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for b in pairs(B) do
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if not A[b] then B_A[b] = true end
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end
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for a_b in pairs(A_B) do
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print( a_b )
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end
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for b_a in pairs(B_A) do
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print( b_a )
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end

‎examples/nodejs/environment.js

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console.log("process.uptime = ", global.process.uptime());
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console.log("process.title = ", global.process.title);
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console.log("process version = ", global.process.version);
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console.log("process.platform = ", global.process.platform);
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console.log("process.cwd = ", global.process.cwd());
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console.log("process.uptime = ", global.process.uptime());

‎examples/nodejs/nbody.js

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const PI = Math.PI;
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const SOLAR_MASS = 4 * PI * PI;
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const DAYS_PER_YEAR = 365.24;
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function Body(x, y, z, vx, vy, vz, mass) {
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this.x = x;
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this.y = y;
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this.z = z;
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this.vx = vx;
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this.vy = vy;
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this.vz = vz;
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this.mass = mass;
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}
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function Jupiter() {
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return new Body(
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4.84143144246472090e+00,
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-1.16032004402742839e+00,
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-1.03622044471123109e-01,
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1.66007664274403694e-03 * DAYS_PER_YEAR,
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7.69901118419740425e-03 * DAYS_PER_YEAR,
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-6.90460016972063023e-05 * DAYS_PER_YEAR,
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9.54791938424326609e-04 * SOLAR_MASS
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);
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}
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function Saturn() {
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return new Body(
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8.34336671824457987e+00,
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4.12479856412430479e+00,
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-4.03523417114321381e-01,
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-2.76742510726862411e-03 * DAYS_PER_YEAR,
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4.99852801234917238e-03 * DAYS_PER_YEAR,
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2.30417297573763929e-05 * DAYS_PER_YEAR,
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2.85885980666130812e-04 * SOLAR_MASS
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);
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}
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function Uranus() {
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return new Body(
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1.28943695621391310e+01,
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-1.51111514016986312e+01,
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-2.23307578892655734e-01,
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2.96460137564761618e-03 * DAYS_PER_YEAR,
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2.37847173959480950e-03 * DAYS_PER_YEAR,
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-2.96589568540237556e-05 * DAYS_PER_YEAR,
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4.36624404335156298e-05 * SOLAR_MASS
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);
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}
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function Neptune() {
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return new Body(
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1.53796971148509165e+01,
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-2.59193146099879641e+01,
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1.79258772950371181e-01,
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2.68067772490389322e-03 * DAYS_PER_YEAR,
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1.62824170038242295e-03 * DAYS_PER_YEAR,
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-9.51592254519715870e-05 * DAYS_PER_YEAR,
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5.15138902046611451e-05 * SOLAR_MASS
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);
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}
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function Sun() {
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return new Body(0.0, 0.0, 0.0, 0.0, 0.0, 0.0, SOLAR_MASS);
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}
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const bodies = Array(Sun(), Jupiter(), Saturn(), Uranus(), Neptune());
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function offsetMomentum() {
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let px = 0;
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let py = 0;
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let pz = 0;
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const size = bodies.length;
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for (let i = 0; i < size; i++) {
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const body = bodies[i];
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const mass = body.mass;
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px += body.vx * mass;
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py += body.vy * mass;
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pz += body.vz * mass;
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}
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const body = bodies[0];
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body.vx = -px / SOLAR_MASS;
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body.vy = -py / SOLAR_MASS;
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body.vz = -pz / SOLAR_MASS;
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}
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function advance(dt) {
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const size = bodies.length;
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for (let i = 0; i < size; i++) {
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const bodyi = bodies[i];
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let vxi = bodyi.vx;
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let vyi = bodyi.vy;
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let vzi = bodyi.vz;
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for (let j = i + 1; j < size; j++) {
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const bodyj = bodies[j];
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const dx = bodyi.x - bodyj.x;
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const dy = bodyi.y - bodyj.y;
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const dz = bodyi.z - bodyj.z;
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const d2 = dx * dx + dy * dy + dz * dz;
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const mag = dt / (d2 * Math.sqrt(d2));
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const massj = bodyj.mass;
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vxi -= dx * massj * mag;
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vyi -= dy * massj * mag;
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vzi -= dz * massj * mag;
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const massi = bodyi.mass;
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bodyj.vx += dx * massi * mag;
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bodyj.vy += dy * massi * mag;
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bodyj.vz += dz * massi * mag;
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}
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bodyi.vx = vxi;
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bodyi.vy = vyi;
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bodyi.vz = vzi;
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}
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for (let i = 0; i < size; i++) {
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const body = bodies[i];
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body.x += dt * body.vx;
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body.y += dt * body.vy;
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body.z += dt * body.vz;
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}
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}
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function energy() {
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let e = 0;
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const size = bodies.length;
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for (let i = 0; i < size; i++) {
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const bodyi = bodies[i];
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e += 0.5 * bodyi.mass * ( bodyi.vx * bodyi.vx + bodyi.vy * bodyi.vy + bodyi.vz * bodyi.vz );
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for (let j = i + 1; j < size; j++) {
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const bodyj = bodies[j];
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const dx = bodyi.x - bodyj.x;
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const dy = bodyi.y - bodyj.y;
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const dz = bodyi.z - bodyj.z;
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const distance = Math.sqrt(dx * dx + dy * dy + dz * dz);
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e -= (bodyi.mass * bodyj.mass) / distance;
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}
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}
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return e;
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}
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const n = +50000000;
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offsetMomentum();
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console.log(energy().toFixed(9));
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const start = Date.now();
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for (let i = 0; i < n; i++) {
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advance(0.01);
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}
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const end = Date.now();
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console.log(energy().toFixed(9));
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console.log("elapsed:",end-start);

‎examples/nodejs/primes.js

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(function () {
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function isPrime(p) {
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const upper = Math.sqrt(p);
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for(let i = 2; i <= upper; i++) {
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if (p % i === 0 ) {
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return false;
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}
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}
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return true;
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}
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// Return n-th prime
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function prime(n) {
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if (n < 1) {
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throw Error("n too small: " + n);
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}
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let count = 0;
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let result = 1;
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while(count < n) {
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result++;
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if (isPrime(result)) {
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count++;
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}
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}
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return result;
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}
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console.log("your prime is ", prime(100000));
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}());

‎examples/nodejs/wasm.js

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(function (){
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let bytes = new Uint8Array([
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0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00,
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0x01, 0x07, 0x01, 0x60, 0x02, 0x7f, 0x7f, 0x01,
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0x7f, 0x03, 0x02, 0x01, 0x00, 0x07, 0x07, 0x01,
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0x03, 0x73, 0x75, 0x6d, 0x00, 0x00, 0x0a, 0x0a,
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0x01, 0x08, 0x00, 0x20, 0x00, 0x20, 0x01, 0x6a,
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0x0f, 0x0b
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]);
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console.log(bytes);
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let mod = new WebAssembly.Module(bytes);
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let instance = new WebAssembly.Instance(mod, {});
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console.log(instance.exports);
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return instance.exports.sum(2020, 1);
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}());

‎examples/python3/factorial.py

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def factorial():
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f, n = 1, 1
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while True: # First iteration:
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yield f # yield 1 to start with and then
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f, n = f * n, n+1 # f will now be 1, and n will be 2, ...
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for index, factorial_number in zip(range(51), factorial()):
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print('{i:3}!= {f:65}'.format(i=index, f=factorial_number))
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‎examples/python3/fibonacci.py

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def fib():
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a, b = 0, 1
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while True: # First iteration:
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yield a # yield 0 to start with and then
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a, b = b, a + b # a will now be 1, and b will also be 1, (0 + 1)
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for index, fibonacci_number in zip(range(100), fib()):
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print('{i:3}: {f:3}'.format(i=index, f=fibonacci_number))
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‎examples/python3/pi.py

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from decimal import Decimal, getcontext
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getcontext().prec=60
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summation = 0
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for k in range(50):
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summation = summation + 1/Decimal(16)**k * (
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Decimal(4)/(8*k+1)
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- Decimal(2)/(8*k+4)
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- Decimal(1)/(8*k+5)
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- Decimal(1)/(8*k+6)
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)
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print(summation)
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