serial_send.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2025 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */


#ifdef __unix__
#include <unistd.h>
#endif

case OP_SERIAL_SEND: {
 /* Pops data (string), fd (int); returns bytes sent (int) */
 Value datav = pop_value(vm);
 Value fdv = pop_value(vm);
 int sent = -1;
#ifdef __unix__
 if (fdv.type != VAL_INT || datav.type != VAL_STRING) {
 fprintf(stderr, "Runtime type error: serial_send expects (int fd, string data)\n");
 } else {
 int fd = (int)fdv.i;
 const char *buf = datav.s ? datav.s : "";
 size_t len = strlen(buf);
 ssize_t n = write(fd, buf, len);
 if (n >= 0) sent = (int)n;
 }
#endif
 free_value(datav);
 free_value(fdv);
 push_value(vm, make_int(sent));
 break;
}