Source code in the wren programming language

/* record_sound.wren */

class C {
    foreign static getInput(maxSize)

    foreign static arecord(args)

    foreign static aplay(name)
}

var name = ""
while (name == "") {
    System.write("Enter output file name (without extension) : ")
    name = C.getInput(80)
}
name = name + ".wav"

var rate = 0
while (!rate || !rate.isInteger || rate < 2000 || rate > 192000) {
    System.write("Enter sampling rate in Hz (2000 to 192000) : ")
    rate = Num.fromString(C.getInput(6))
}
var rateS = rate.toString

var dur = 0
while (!dur || dur < 5 || dur > 30) {
    System.write("Enter duration in seconds (5 to 30)        : ")
    dur = Num.fromString(C.getInput(5))
}
var durS = dur.toString

System.print("\nOK, start speaking now...")
// Default arguments: -c 1, -t wav. Note only signed 16 bit format supported.
var args = ["-r", rateS, "-f", "S16_LE", "-d", durS, name]
C.arecord(args.join(" "))

System.print("\n'%(name)' created on disk and will now be played back...")
C.aplay(name)
System.print("\nPlay-back completed.")

#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
#include "wren.h"

void C_getInput(WrenVM* vm) {
    int maxSize = (int)wrenGetSlotDouble(vm, 1) + 2;
    char input[maxSize];
    fgets(input, maxSize, stdin);
    __fpurge(stdin);
    input[strcspn(input, "\n")] = 0;
    wrenSetSlotString(vm, 0, (const char*)input);
}

void C_arecord(WrenVM* vm) {
    const char *args = wrenGetSlotString(vm, 1);
    char command[strlen(args) + 8];
    strcpy(command, "arecord ");
    strcat(command, args);
    system(command);
}

void C_aplay(WrenVM* vm) {
    const char *name = wrenGetSlotString(vm, 1);
    char command[strlen(name) + 6];
    strcpy(command, "aplay ");
    strcat(command, name);
    system(command);
}

WrenForeignMethodFn bindForeignMethod(
    WrenVM* vm,
    const char* module,
    const char* className,
    bool isStatic,
    const char* signature) {
    if (strcmp(module, "main") == 0) {
        if (strcmp(className, "C") == 0) {
            if (isStatic && strcmp(signature, "getInput(_)") == 0) return C_getInput;
            if (isStatic && strcmp(signature, "arecord(_)") == 0)  return C_arecord;
            if (isStatic && strcmp(signature, "aplay(_)") == 0)    return C_aplay;
        }
    }
    return NULL;
}

static void writeFn(WrenVM* vm, const char* text) {
    printf("%s", text);
}

void errorFn(WrenVM* vm, WrenErrorType errorType, const char* module, const int line, const char* msg) {
    switch (errorType) {
        case WREN_ERROR_COMPILE:
            printf("[%s line %d] [Error] %s\n", module, line, msg);
            break;
        case WREN_ERROR_STACK_TRACE:
            printf("[%s line %d] in %s\n", module, line, msg);
            break;
        case WREN_ERROR_RUNTIME:
            printf("[Runtime Error] %s\n", msg);
            break;
    }
}

char *readFile(const char *fileName) {
    FILE *f = fopen(fileName, "r");
    fseek(f, 0, SEEK_END);
    long fsize = ftell(f);
    rewind(f);
    char *script = malloc(fsize + 1);
    fread(script, 1, fsize, f);
    fclose(f);
    script[fsize] = 0;
    return script;
}

int main(int argc, char **argv) {
    WrenConfiguration config;
    wrenInitConfiguration(&config);
    config.writeFn = &writeFn;
    config.errorFn = &errorFn;
    config.bindForeignMethodFn = &bindForeignMethod;
    WrenVM* vm = wrenNewVM(&config);
    const char* module = "main";
    const char* fileName = "record_sound.wren";
    char *script = readFile(fileName);
    WrenInterpretResult result = wrenInterpret(vm, module, script);
    switch (result) {
        case WREN_RESULT_COMPILE_ERROR:
            printf("Compile Error!\n");
            break;
        case WREN_RESULT_RUNTIME_ERROR:
            printf("Runtime Error!\n");
            break;
        case WREN_RESULT_SUCCESS:
            break;
    }
    wrenFreeVM(vm);
    free(script);
    return 0;
}