Test programs for Windows Console

console-dev.c

#include <stdio.h>
#include <locale.h>
#include <io.h>
#include <fcntl.h>
#include <windows.h>

BOOL is_stream_console(FILE *stream)
{
    DWORD mode;
    // GetConsoleMode requires GENERIC_READ access on the handle
    return !!GetConsoleMode((HANDLE)_get_osfhandle(_fileno(stream)), &mode);
}
BOOL is_stream_console_output(FILE *stream)
{
    DWORD written;
    return !!WriteConsoleW((HANDLE)_get_osfhandle(_fileno(stream)), NULL, 0, &written, NULL);
}

void print_stream_info(const char *name, FILE *stream)
{
    fprintf(stderr, "%s is %sa tty.\n", name, _isatty(_fileno(stdout)) ? "" : "not ");
    fprintf(stderr, "%s is %sa console.\n", name, is_stream_console(stdout) ? "" : "not ");
    fprintf(stderr, "%s is %sa console output.\n", name, is_stream_console_output(stdout) ? "" : "not ");
}

int main(int argc, char *argv[])
{
    _setmode(_fileno(stdout), _O_U8TEXT);
    print_stream_info("stdout", stdout);
    fputws(L"Caf\u00e9 au lait\n", stdout);
    fputws(L"\u732B\n", stdout);

    const char *names[] = {"CON", "CONOUT$"};
    const char *modes[] = {"w", "w+"};
    for (int i = 0; i < 2; ++i) {
        for (int j = 0; j < 2; ++j) {
            const char *name = names[i];
            const char *mode = modes[j];
            FILE *f = fopen(name, mode);
            if (f == NULL) {
                fprintf(stderr, "fopen(%s, %s) failed.\n", name, mode);
            } else {
                _setmode(_fileno(f), _O_U8TEXT);
                char stream_name[100];
                sprintf(stream_name, "fopen(%s, %s)", name, mode);
                print_stream_info(stream_name, f);
                fputws(L"Caf\u00e9 au lait\n", f);
                fputws(L"\u732B\n", f);
                fclose(f);
            }
        }
    }
}

console-unicode.c

#include <stdio.h>
#include <io.h>
#include <fcntl.h>

int main(int argc, char *argv[])
{
    _setmode(_fileno(stdout), _O_U8TEXT);
    fputws(L"Caf\u00e9 au lait\n", stdout);
    fputws(L"\u732B\n", stdout);
    //puts("Hello world!"); // puts() fails because stdout is Unicode mode.
}

console-utf8.c

#include <stdio.h>
#include <io.h>
#include <fcntl.h>
#include <windows.h>

int main(int argc, char *argv[])
{
    _setmode(_fileno(stdout), _O_BINARY);
    fprintf(stdout, "Console output code page is %d. (should be 65001)\n", GetConsoleOutputCP());
    fputs(u8"Caf\u00e9 au lait\n", stdout);
    fputs(u8"\u732B\n", stdout);
}

console-utf8t.c

#include <stdio.h>
#include <locale.h>
#include <io.h>
#include <fcntl.h>
#include <windows.h>

int main(int argc, char *argv[])
{
    setlocale(LC_CTYPE, "C"); // LC_CTYPE must be "C"
    _setmode(_fileno(stdout), _O_TEXT);
    fprintf(stdout, "Console output code page is %d. (should be 65001)\n", GetConsoleOutputCP());
    fputs(u8"Caf\u00e9 au lait\n", stdout);
    fputs(u8"\u732B\n", stdout);

    setvbuf(stdout, NULL, _IOFBF, 1024);
    fputws(L"Caf\xc3\xa9 au lait\n", stdout);
    fputws(L"\xe7\x8c\xab\n", stdout);
}