test/demo_altkeys.c

/****************************************************************************
 * Copyright 2018-2022,2023 Thomas E. Dickey                                *
 * Copyright 2005-2016,2017 Free Software Foundation, Inc.                  *
 *                                                                          *
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 * copy of this software and associated documentation files (the            *
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 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
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 ****************************************************************************/
/*
 * $Id: demo_altkeys.c,v 1.17 2023/02/25 18:08:02 tom Exp $
 *
 * Demonstrate the define_key() function.
 * Thomas Dickey - 2005/10/22
 */

#define NEED_TIME_H
#include <test.priv.h>

#if defined(NCURSES_VERSION) && NCURSES_EXT_FUNCS

#define MY_LOGFILE "demo_altkeys.log"
#define MY_KEYS (KEY_MAX + 1)

/*
 * Log the most recently-written line to our logfile
 */
static void
log_last_line(WINDOW *win)
{
    FILE *fp;

    if ((fp = fopen(MY_LOGFILE, "a")) != 0) {
	char temp[256];
	int y, x, n;
	int need = sizeof(temp) - 1;

	if (need > COLS)
	    need = COLS;
	getyx(win, y, x);
	wmove(win, y - 1, 0);
	n = winnstr(win, temp, need);
	while (n-- > 0) {
	    if (isspace(UChar(temp[n])))
		temp[n] = '\0';
	    else
		break;
	}
	wmove(win, y, x);
	fprintf(fp, "%s\n", temp);
	fclose(fp);
    }
}

static void
usage(int ok)
{
    static const char *msg[] =
    {
	"Usage: demo_altkeys [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 n;
    int ch;
    TimeType previous;

    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);

    unlink(MY_LOGFILE);

    setlocale(LC_ALL, "");
    if (newterm(0, stdout, stdin) == 0) {
	fprintf(stderr, "Cannot initialize terminal\n");
	ExitProgram(EXIT_FAILURE);
    }
    (void) cbreak();		/* take input chars one at a time, no wait for \n */
    (void) noecho();		/* don't echo input */

    scrollok(stdscr, TRUE);
    keypad(stdscr, TRUE);
    move(0, 0);

    /* we do the define_key() calls after keypad(), since the first call to
     * keypad() initializes the corresponding data.
     */
    for (n = 0; n < 255; ++n) {
	char temp[10];
	_nc_SPRINTF(temp, _nc_SLIMIT(sizeof(temp)) "\033%c", n);
	define_key(temp, n + MY_KEYS);
    }
    for (n = KEY_MIN; n < KEY_MAX; ++n) {
	char *value;
	if ((value = keybound(n, 0)) != 0) {
	    size_t need = strlen(value) + 2;
	    char *temp = typeMalloc(char, need);
	    _nc_SPRINTF(temp, _nc_SLIMIT(need) "\033%s", value);
	    define_key(temp, n + MY_KEYS);
	    free(temp);
	    free(value);
	}
    }

    GetClockTime(&previous);

    while ((ch = getch()) != ERR) {
	bool escaped = (ch >= MY_KEYS);
	const char *name = keyname(escaped ? (ch - MY_KEYS) : ch);
	TimeType current;

	GetClockTime(&current);
	printw("%6.03f ", ElapsedSeconds(&previous, &current));
	previous = current;
	printw("Keycode %d, name %s%s\n",
	       ch,
	       escaped ? "ESC-" : "",
	       name != 0 ? name : "<null>");
	log_last_line(stdscr);
	clrtoeol();
	if (ch == 'q')
	    break;
    }
    endwin();
    ExitProgram(EXIT_SUCCESS);
}
#else
int
main(void)
{
    printf("This program requires the ncurses library\n");
    ExitProgram(EXIT_FAILURE);
}
#endif