test/test_unget_wch.c

/****************************************************************************
 * Copyright 2022 Thomas E. Dickey                                          *
 *                                                                          *
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/*
 * $Id: test_unget_wch.c,v 1.4 2022/12/10 23:31:31 tom Exp $
 *
 * Demonstrate the unget_wch and unget functions.
 */

#include <test.priv.h>

#if USE_WIDEC_SUPPORT && HAVE_UNGET_WCH
static void
usage(int ok)
{
    static const char *msg[] =
    {
	"Usage: test_unget_wch [options]"
	,""
	,USAGE_COMMON
    };
    size_t n;

    for (n = 0; n < SIZEOF(msg); n++)
	fprintf(stderr, "%s\n", msg[n]);

    ExitProgram(ok ? EXIT_SUCCESS : EXIT_FAILURE);
}
/* *INDENT-OFF* */
VERSION_COMMON()
/* *INDENT-ON* */

int
main(int argc, char *argv[])
{
    int step = 0;
    int ch;

    while ((ch = getopt(argc, argv, OPTS_COMMON)) != -1) {
	switch (ch) {
	case OPTS_VERSION:
	    show_version(argv);
	    ExitProgram(EXIT_SUCCESS);
	default:
	    usage(ch == OPTS_USAGE);
	    /* NOTREACHED */
	}
    }
    if (optind < argc)
	usage(FALSE);

    setlocale(LC_ALL, "");
    initscr();
    keypad(stdscr, TRUE);
    cbreak();
    noecho();
    scrollok(stdscr, TRUE);

    for (;;) {
	wint_t widechar;
	int rc = get_wch(&widechar);
	if (rc == KEY_CODE_YES) {
	    printw("KEY[%d] %s\n", ++step, keyname((int) widechar));
	    ungetch((int) widechar);
	    printw("...[%d] %s\n", step, keyname(getch()));
	} else if (widechar == QUIT || widechar == ESCAPE) {
	    break;
	} else {
	    printw("CHR[%d] %s\n", ++step, key_name((wchar_t) widechar));
	    unget_wch((wchar_t) widechar);
	    rc = get_wch(&widechar);
	    printw("%s[%d] %s\n",
		   ((rc == KEY_CODE_YES)
		    ? "???"
		    : "..."),
		   step, key_name((wchar_t) widechar));
	}
    }

    endwin();

    ExitProgram(EXIT_SUCCESS);
}

#else
int
main(void)
{
    printf("This program requires the wide-ncurses library\n");
    ExitProgram(EXIT_FAILURE);
}
#endif