test/padview.c - third_party/ncurses - Git at Google

 /****************************************************************************
  * Copyright 2019-2021,2022 Thomas E. Dickey                                *
  * Copyright 2017 Free Software Foundation, Inc.                            *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
  * "Software"), to deal in the Software without restriction, including      *
  * 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.                   *
  *                                                                          *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  *                                                                          *
  * Except as contained in this notice, the name(s) of the above copyright   *
  * holders shall not be used in advertising or otherwise to promote the     *
  * sale, use or other dealings in this Software without prior written       *
  * authorization.                                                           *
  ****************************************************************************/
 /*
  * clone of view.c, using pads
  *
  * $Id: padview.c,v 1.22 2022/12/04 00:40:11 tom Exp $
  */

 #include <test.priv.h>
 #include <widechars.h>
 #include <popup_msg.h>

 #include <sys/stat.h>
 #include <time.h>

 #if HAVE_NEWPAD

 static GCC_NORETURN void finish(int sig);

 #define my_pair 1

 static WINDOW *global_pad;
 static int shift = 0;
 static bool try_color = FALSE;

 static char *fname;
 static int num_lines;

 #if USE_WIDEC_SUPPORT
 static bool n_option = FALSE;
 #endif

 static void
 failed(const char *msg)
 {
     endwin();
     fprintf(stderr, "%s\n", msg);
     ExitProgram(EXIT_FAILURE);
 }

 static void
 finish(int sig)
 {
     endwin();
     if (global_pad != NULL)
 	delwin(global_pad);
     ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
 }

 static void
 show_all(const char *tag, WINDOW *my_pad, int my_row)
 {
     int i;
     int digits;
     char temp[BUFSIZ];
     time_t this_time;

     for (digits = 1, i = num_lines; i > 0; i /= 10) {
 	++digits;
     }

     wattrset(stdscr, COLOR_PAIR(my_pair));
     clear();

     _nc_SPRINTF(temp, _nc_SLIMIT(sizeof(temp))
 		"view %.*s", (int) strlen(tag), tag);
     i = (int) strlen(temp);
     _nc_SPRINTF(temp + i, _nc_SLIMIT(sizeof(temp) - (size_t) i)
 		" %.*s", (int) sizeof(temp) - i - 2, fname);
     mvprintw(0, 0, "%.*s", COLS, temp);
     this_time = time((time_t *) 0);
     _nc_STRNCPY(temp, ctime(&this_time), (size_t) 30);
     if ((i = (int) strlen(temp)) != 0) {
 	temp[--i] = 0;
 	mvprintw(0, COLS - i - 2, "  %s", temp);
     }

     for (i = 1; i < LINES; i++) {
 	int actual = my_row + i;
 	if (actual > num_lines) {
 	    break;
 	}
 	mvprintw(i, 0, "%*d:", digits, actual);
     }
     wnoutrefresh(stdscr);
     pnoutrefresh(my_pad, my_row, shift, 1, digits + 1, LINES - 1, COLS - 1);
     doupdate();
 }

 static WINDOW *
 read_file(const char *filename)
 {
     FILE *fp;
     int pass;
     int k;
     int height, width;
     size_t j;
     size_t len;
     struct stat sb;
     char *my_blob;
     char **my_vec = 0;
     WINDOW *my_pad;

     if (stat(filename, &sb) != 0
 	|| (sb.st_mode & S_IFMT) != S_IFREG) {
 	failed("input is not a file");
     }

     if (sb.st_size == 0) {
 	failed("input is empty");
     }

     if ((fp = fopen(filename, "r")) == 0) {
 	failed("cannot open input-file");
     }

     if ((my_blob = malloc((size_t) sb.st_size + 1)) == 0) {
 	failed("cannot allocate memory for input-file");
     }

     len = fread(my_blob, sizeof(char), (size_t) sb.st_size, fp);
     fclose(fp);

     if (len > (size_t) sb.st_size)
 	len = (size_t) sb.st_size;
     my_blob[len] = '\0';

     for (pass = 0; pass < 2; ++pass) {
 	char *base = my_blob;
 	k = 0;
 	for (j = 0; j < len; ++j) {
 	    if (my_blob[j] == '\n') {
 		if (pass) {
 		    my_vec[k] = base;
 		    my_blob[j] = '\0';
 		}
 		base = my_blob + j + 1;
 		++k;
 	    }
 	}
 	if (base != (my_blob + j)) {
 	    if (pass)
 		my_vec[k] = base;
 	    ++k;
 	}
 	num_lines = k;
 	if (pass == 0) {
 	    if (((my_vec = typeCalloc(char *, (size_t) k + 2)) == 0)) {
 		failed("cannot allocate line-vector #1");
 	    }
 	} else {
 	    if (my_vec[0] == NULL)
 		my_vec[0] = my_blob;
 	}
     }

 #if USE_WIDEC_SUPPORT
     if (!memcmp("\357\273\277", my_blob, 3)) {
 	char *s = my_blob + 3;
 	char *d = my_blob;
 	Trace(("trim BOM"));
 	do {
 	} while ((*d++ = *s++) != '\0');
     }
 #endif

     height = num_lines;
     width = (int) strlen(my_vec[0]);
     for (k = 1; my_vec[k]; ++k) {
 	int check = (int) (my_vec[k] - my_vec[k - 1]);
 	if (width < check)
 	    width = check;
     }
     width = (width + 1) * 5;
     my_pad = newpad(height, width);
     if (my_pad == 0)
 	failed("cannot allocate pad workspace");
     if (try_color) {
 	wattrset(my_pad, COLOR_PAIR(my_pair));
 	wbkgd(my_pad, (chtype) (' ' | COLOR_PAIR(my_pair)));
     }

     /*
      * Use the curses library for rendering, including tab-conversion.
      */
     Trace(("slurp the file"));
     for (k = 0; my_vec[k]; ++k) {
 	char *s;
 #if USE_WIDEC_SUPPORT
 	char *last = my_vec[k] + (int) strlen(my_vec[k]);
 	wchar_t wch[2];
 	size_t rc;
 #ifndef state_unused
 	mbstate_t state;
 #endif
 #endif /* USE_WIDEC_SUPPORT */

 	wmove(my_pad, k, 0);
 #if USE_WIDEC_SUPPORT
 	wch[1] = 0;
 	reset_mbytes(state);
 #endif
 	for (s = my_vec[k]; *s != '\0'; ++s) {
 #if USE_WIDEC_SUPPORT
 	    if (!n_option) {
 		rc = (size_t) check_mbytes(wch[0], s, (size_t) (last - s), state);
 		if ((long) rc == -1 || (long) rc == -2) {
 		    break;
 		}
 		s += rc - 1;
 		waddwstr(my_pad, wch);
 	    } else
 #endif
 		waddch(my_pad, *s & 0xff);
 	}
     }

     free(my_vec);
     free(my_blob);

     return my_pad;
 }

 static void
 usage(int ok)
 {
     static const char *msg[] =
     {
 	"Usage: view [options] file"
 	,""
 	,USAGE_COMMON
 	,"Options:"
 	," -c       use color if terminal supports it"
 	," -i       ignore INT, QUIT, TERM signals"
 #if USE_WIDEC_SUPPORT
 	," -n       use waddch (bytes) rather then wadd_wch (wide-chars)"
 #endif
 	," -s       start in single-step mode, waiting for input"
 #ifdef TRACE
 	," -t       trace screen updates"
 	," -T NUM   specify trace mask"
 #endif
     };
     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[])
 {
     static const char *help[] =
     {
 	"Commands:",
 	"  q,^Q,ESC       - quit this program",
 	"",
 	"  p,<Up>         - scroll the viewport up by one row",
 	"  n,<Down>       - scroll the viewport down by one row",
 	"  l,<Left>       - scroll the viewport left by one column",
 	"  r,<Right>      - scroll the viewport right by one column",
 	"  <,>            - scroll the viewport left/right by 8 columns",
 	"",
 	"  h,<Home>       - scroll the viewport to top of file",
 	"  ^F,<PageDn>    - scroll to the next page",
 	"  ^B,<PageUp>    - scroll to the previous page",
 	"  e,<End>        - scroll the viewport to end of file",
 	"",
 	"  ^L             - repaint using redrawwin()",
 	"",
 	"  0 through 9    - enter digits for count",
 	"  s              - use entered count for halfdelay() parameter",
 	"                 - if no entered count, stop nodelay()",
 	"  <space>        - begin nodelay()",
 	0
     };

     int ch;
     int i;
     int my_delay = 0;
     WINDOW *my_pad;
     int my_row = 0;
     int value = 0;
     bool done = FALSE;
     bool got_number = FALSE;
     bool ignore_sigs = FALSE;
     bool single_step = FALSE;
     const char *my_label = "Input";

     setlocale(LC_ALL, "");

     while ((ch = getopt(argc, argv, OPTS_COMMON "cinstT:")) != -1) {
 	switch (ch) {
 	case 'c':
 	    try_color = TRUE;
 	    break;
 	case 'i':
 	    ignore_sigs = TRUE;
 	    break;
 #if USE_WIDEC_SUPPORT
 	case 'n':
 	    n_option = TRUE;
 	    break;
 #endif
 	case 's':
 	    single_step = TRUE;
 	    break;
 #ifdef TRACE
 	case 'T':
 	    {
 		char *next = 0;
 		int tvalue = (int) strtol(optarg, &next, 0);
 		if (tvalue < 0 || (next != 0 && *next != 0))
 		    usage(FALSE);
 		curses_trace((unsigned) tvalue);
 	    }
 	    break;
 	case 't':
 	    curses_trace(TRACE_CALLS);
 	    break;
 #endif
 	case OPTS_VERSION:
 	    show_version(argv);
 	    ExitProgram(EXIT_SUCCESS);
 	default:
 	    usage(ch == OPTS_USAGE);
 	    /* NOTREACHED */
 	}
     }
     if (optind + 1 != argc)
 	usage(FALSE);

     InitAndCatch(initscr(), ignore_sigs ? SIG_IGN : finish);
     keypad(stdscr, TRUE);	/* enable keyboard mapping */
     (void) nonl();		/* tell curses not to do NL->CR/NL on output */
     (void) cbreak();		/* take input chars one at a time, no wait for \n */
     (void) noecho();		/* don't echo input */
     if (!single_step)
 	nodelay(stdscr, TRUE);
     idlok(stdscr, TRUE);	/* allow use of insert/delete line */

     if (try_color) {
 	if (has_colors()) {
 	    start_color();
 	    init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
 	    bkgd((chtype) (' ' | COLOR_PAIR(my_pair)));
 	} else {
 	    try_color = FALSE;
 	}
     }

     /*
      * Do this after starting color, otherwise the pad's background will be
      * uncolored after the ncurses 6.1.20181208 fixes.
      */
     global_pad =
 	my_pad = read_file(fname = argv[optind]);

     my_row = 0;
     while (!done) {
 	int n, c;

 	if (!got_number)
 	    show_all(my_label, my_pad, my_row);

 	for (;;) {
 	    c = getch();
 	    if ((c < 127) && isdigit(c)) {
 		if (!got_number) {
 		    MvPrintw(0, 0, "Count: ");
 		    clrtoeol();
 		}
 		addch(UChar(c));
 		value = 10 * value + (c - '0');
 		got_number = TRUE;
 	    } else
 		break;
 	}
 	if (got_number && value) {
 	    n = value;
 	} else {
 	    n = 1;
 	}

 	if (c != ERR)
 	    my_label = keyname(c);
 	switch (c) {
 	case KEY_DOWN:
 	case 'n':
 	    for (i = 0; i < n; i++)
 		if (my_row < (num_lines - LINES + 1))
 		    my_row++;
 		else
 		    break;
 	    break;

 	case KEY_UP:
 	case 'p':
 	    for (i = 0; i < n; i++)
 		if (my_row > 0)
 		    my_row--;
 		else
 		    break;
 	    break;

 	case 'h':
 	    /* FALLTHRU */
 	case KEY_HOME:
 	    my_row = 0;
 	    break;

 	case '<':
 	    if ((shift -= 8) < 0)
 		shift = 0;
 	    break;
 	case '>':
 	    shift += 8;
 	    break;

 	case 'e':
 	    /* FALLTHRU */
 	case KEY_END:
 	    if (num_lines > LINES)
 		my_row = (num_lines - LINES + 1);
 	    else
 		my_row = (num_lines - 2);
 	    break;

 	case CTRL('F'):
 	    /* FALLTHRU */
 	case KEY_NPAGE:
 	    for (i = 0; i < n; i++) {
 		if (my_row < (num_lines - 5))
 		    my_row += (LINES - 1);
 		else
 		    my_row = (num_lines - 2);
 	    }
 	    break;

 	case CTRL('B'):
 	    /* FALLTHRU */
 	case KEY_PPAGE:
 	    for (i = 0; i < n; i++) {
 		if (my_row >= LINES)
 		    my_row -= (LINES - 1);
 		else
 		    my_row = 0;
 	    }
 	    break;

 	case 'r':
 	case KEY_RIGHT:
 	    shift += n;
 	    break;

 	case 'l':
 	case KEY_LEFT:
 	    shift -= n;
 	    if (shift < 0) {
 		shift = 0;
 		beep();
 	    }
 	    break;

 	case 'q':
 	case QUIT:
 	case ESCAPE:
 	    done = TRUE;
 	    break;

 #ifdef KEY_RESIZE
 	case KEY_RESIZE:	/* ignore this; ncurses will repaint */
 	    break;
 #endif
 	case 's':
 #if HAVE_HALFDELAY
 	    if (got_number) {
 		halfdelay(my_delay = n);
 	    } else {
 		nodelay(stdscr, FALSE);
 		my_delay = -1;
 	    }
 #else
 	    nodelay(stdscr, FALSE);
 	    my_delay = -1;
 #endif
 	    break;
 	case ' ':
 	    nodelay(stdscr, TRUE);
 	    my_delay = 0;
 	    break;
 	case CTRL('L'):
 	    redrawwin(stdscr);
 	    break;
 	case ERR:
 	    if (!my_delay)
 		napms(50);
 	    break;
 	case HELP_KEY_1:
 	    popup_msg(stdscr, help);
 	    break;
 	default:
 	    beep();
 	    break;
 	}
 	if (c >= KEY_MIN || (c > 0 && !isdigit(c))) {
 	    got_number = FALSE;
 	    value = 0;
 	}
     }

     finish(0);			/* we're done */
 }
 #else
 int
 main(void)
 {
     printf("This program requires the curses pad functions\n");
     ExitProgram(EXIT_FAILURE);
 }
 #endif
	/****************************************************************************
	* Copyright 2019-2021,2022 Thomas E. Dickey *
	* Copyright 2017 Free Software Foundation, Inc. *
	* *
	* Permission is hereby granted, free of charge, to any person obtaining a *
	* copy of this software and associated documentation files (the *
	* "Software"), to deal in the Software without restriction, including *
	* 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. *
	* *
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
	* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
	* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
	* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
	* *
	* Except as contained in this notice, the name(s) of the above copyright *
	* holders shall not be used in advertising or otherwise to promote the *
	* sale, use or other dealings in this Software without prior written *
	* authorization. *
	****************************************************************************/
	/*
	* clone of view.c, using pads
	*
	* $Id: padview.c,v 1.22 2022/12/04 00:40:11 tom Exp $
	*/

	#include <test.priv.h>
	#include <widechars.h>
	#include <popup_msg.h>

	#include <sys/stat.h>
	#include <time.h>

	#if HAVE_NEWPAD

	static GCC_NORETURN void finish(int sig);

	#define my_pair 1

	static WINDOW *global_pad;
	static int shift = 0;
	static bool try_color = FALSE;

	static char *fname;
	static int num_lines;

	#if USE_WIDEC_SUPPORT
	static bool n_option = FALSE;
	#endif

	static void
	failed(const char *msg)
	{
	endwin();
	fprintf(stderr, "%s\n", msg);
	ExitProgram(EXIT_FAILURE);
	}

	static void
	finish(int sig)
	{
	endwin();
	if (global_pad != NULL)
	delwin(global_pad);
	ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
	}

	static void
	show_all(const char tag, WINDOW my_pad, int my_row)
	{
	int i;
	int digits;
	char temp[BUFSIZ];
	time_t this_time;

	for (digits = 1, i = num_lines; i > 0; i /= 10) {
	++digits;
	}

	wattrset(stdscr, COLOR_PAIR(my_pair));
	clear();

	_nc_SPRINTF(temp, _nc_SLIMIT(sizeof(temp))
	"view %.*s", (int) strlen(tag), tag);
	i = (int) strlen(temp);
	_nc_SPRINTF(temp + i, _nc_SLIMIT(sizeof(temp) - (size_t) i)
	" %.*s", (int) sizeof(temp) - i - 2, fname);
	mvprintw(0, 0, "%.*s", COLS, temp);
	this_time = time((time_t *) 0);
	_nc_STRNCPY(temp, ctime(&this_time), (size_t) 30);
	if ((i = (int) strlen(temp)) != 0) {
	temp[--i] = 0;
	mvprintw(0, COLS - i - 2, " %s", temp);
	}

	for (i = 1; i < LINES; i++) {
	int actual = my_row + i;
	if (actual > num_lines) {
	break;
	}
	mvprintw(i, 0, "%*d:", digits, actual);
	}
	wnoutrefresh(stdscr);
	pnoutrefresh(my_pad, my_row, shift, 1, digits + 1, LINES - 1, COLS - 1);
	doupdate();
	}

	static WINDOW *
	read_file(const char *filename)
	{
	FILE *fp;
	int pass;
	int k;
	int height, width;
	size_t j;
	size_t len;
	struct stat sb;
	char *my_blob;
	char **my_vec = 0;
	WINDOW *my_pad;

	if (stat(filename, &sb) != 0
	\|\| (sb.st_mode & S_IFMT) != S_IFREG) {
	failed("input is not a file");
	}

	if (sb.st_size == 0) {
	failed("input is empty");
	}

	if ((fp = fopen(filename, "r")) == 0) {
	failed("cannot open input-file");
	}

	if ((my_blob = malloc((size_t) sb.st_size + 1)) == 0) {
	failed("cannot allocate memory for input-file");
	}

	len = fread(my_blob, sizeof(char), (size_t) sb.st_size, fp);
	fclose(fp);

	if (len > (size_t) sb.st_size)
	len = (size_t) sb.st_size;
	my_blob[len] = '\0';

	for (pass = 0; pass < 2; ++pass) {
	char *base = my_blob;
	k = 0;
	for (j = 0; j < len; ++j) {
	if (my_blob[j] == '\n') {
	if (pass) {
	my_vec[k] = base;
	my_blob[j] = '\0';
	}
	base = my_blob + j + 1;
	++k;
	}
	}
	if (base != (my_blob + j)) {
	if (pass)
	my_vec[k] = base;
	++k;
	}
	num_lines = k;
	if (pass == 0) {
	if (((my_vec = typeCalloc(char *, (size_t) k + 2)) == 0)) {
	failed("cannot allocate line-vector #1");
	}
	} else {
	if (my_vec[0] == NULL)
	my_vec[0] = my_blob;
	}
	}

	#if USE_WIDEC_SUPPORT
	if (!memcmp("\357\273\277", my_blob, 3)) {
	char *s = my_blob + 3;
	char *d = my_blob;
	Trace(("trim BOM"));
	do {
	} while ((d++ = s++) != '\0');
	}
	#endif

	height = num_lines;
	width = (int) strlen(my_vec[0]);
	for (k = 1; my_vec[k]; ++k) {
	int check = (int) (my_vec[k] - my_vec[k - 1]);
	if (width < check)
	width = check;
	}
	width = (width + 1) * 5;
	my_pad = newpad(height, width);
	if (my_pad == 0)
	failed("cannot allocate pad workspace");
	if (try_color) {
	wattrset(my_pad, COLOR_PAIR(my_pair));
	wbkgd(my_pad, (chtype) (' ' \| COLOR_PAIR(my_pair)));
	}

	/*
	* Use the curses library for rendering, including tab-conversion.
	*/
	Trace(("slurp the file"));
	for (k = 0; my_vec[k]; ++k) {
	char *s;
	#if USE_WIDEC_SUPPORT
	char *last = my_vec[k] + (int) strlen(my_vec[k]);
	wchar_t wch[2];
	size_t rc;
	#ifndef state_unused
	mbstate_t state;
	#endif
	#endif /* USE_WIDEC_SUPPORT */

	wmove(my_pad, k, 0);
	#if USE_WIDEC_SUPPORT
	wch[1] = 0;
	reset_mbytes(state);
	#endif
	for (s = my_vec[k]; *s != '\0'; ++s) {
	#if USE_WIDEC_SUPPORT
	if (!n_option) {
	rc = (size_t) check_mbytes(wch[0], s, (size_t) (last - s), state);
	if ((long) rc == -1 \|\| (long) rc == -2) {
	break;
	}
	s += rc - 1;
	waddwstr(my_pad, wch);
	} else
	#endif
	waddch(my_pad, *s & 0xff);
	}
	}

	free(my_vec);
	free(my_blob);

	return my_pad;
	}

	static void
	usage(int ok)
	{
	static const char *msg[] =
	{
	"Usage: view [options] file"
	,""
	,USAGE_COMMON
	,"Options:"
	," -c use color if terminal supports it"
	," -i ignore INT, QUIT, TERM signals"
	#if USE_WIDEC_SUPPORT
	," -n use waddch (bytes) rather then wadd_wch (wide-chars)"
	#endif
	," -s start in single-step mode, waiting for input"
	#ifdef TRACE
	," -t trace screen updates"
	," -T NUM specify trace mask"
	#endif
	};
	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[])
	{
	static const char *help[] =
	{
	"Commands:",
	" q,^Q,ESC - quit this program",
	"",
	" p,<Up> - scroll the viewport up by one row",
	" n,<Down> - scroll the viewport down by one row",
	" l,<Left> - scroll the viewport left by one column",
	" r,<Right> - scroll the viewport right by one column",
	" <,> - scroll the viewport left/right by 8 columns",
	"",
	" h,<Home> - scroll the viewport to top of file",
	" ^F,<PageDn> - scroll to the next page",
	" ^B,<PageUp> - scroll to the previous page",
	" e,<End> - scroll the viewport to end of file",
	"",
	" ^L - repaint using redrawwin()",
	"",
	" 0 through 9 - enter digits for count",
	" s - use entered count for halfdelay() parameter",
	" - if no entered count, stop nodelay()",
	" <space> - begin nodelay()",
	0
	};

	int ch;
	int i;
	int my_delay = 0;
	WINDOW *my_pad;
	int my_row = 0;
	int value = 0;
	bool done = FALSE;
	bool got_number = FALSE;
	bool ignore_sigs = FALSE;
	bool single_step = FALSE;
	const char *my_label = "Input";

	setlocale(LC_ALL, "");

	while ((ch = getopt(argc, argv, OPTS_COMMON "cinstT:")) != -1) {
	switch (ch) {
	case 'c':
	try_color = TRUE;
	break;
	case 'i':
	ignore_sigs = TRUE;
	break;
	#if USE_WIDEC_SUPPORT
	case 'n':
	n_option = TRUE;
	break;
	#endif
	case 's':
	single_step = TRUE;
	break;
	#ifdef TRACE
	case 'T':
	{
	char *next = 0;
	int tvalue = (int) strtol(optarg, &next, 0);
	if (tvalue < 0 \|\| (next != 0 && *next != 0))
	usage(FALSE);
	curses_trace((unsigned) tvalue);
	}
	break;
	case 't':
	curses_trace(TRACE_CALLS);
	break;
	#endif
	case OPTS_VERSION:
	show_version(argv);
	ExitProgram(EXIT_SUCCESS);
	default:
	usage(ch == OPTS_USAGE);
	/* NOTREACHED */
	}
	}
	if (optind + 1 != argc)
	usage(FALSE);

	InitAndCatch(initscr(), ignore_sigs ? SIG_IGN : finish);
	keypad(stdscr, TRUE); /* enable keyboard mapping */
	(void) nonl(); /* tell curses not to do NL->CR/NL on output */
	(void) cbreak(); /* take input chars one at a time, no wait for \n */
	(void) noecho(); /* don't echo input */
	if (!single_step)
	nodelay(stdscr, TRUE);
	idlok(stdscr, TRUE); /* allow use of insert/delete line */

	if (try_color) {
	if (has_colors()) {
	start_color();
	init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
	bkgd((chtype) (' ' \| COLOR_PAIR(my_pair)));
	} else {
	try_color = FALSE;
	}
	}

	/*
	* Do this after starting color, otherwise the pad's background will be
	* uncolored after the ncurses 6.1.20181208 fixes.
	*/
	global_pad =
	my_pad = read_file(fname = argv[optind]);

	my_row = 0;
	while (!done) {
	int n, c;

	if (!got_number)
	show_all(my_label, my_pad, my_row);

	for (;;) {
	c = getch();
	if ((c < 127) && isdigit(c)) {
	if (!got_number) {
	MvPrintw(0, 0, "Count: ");
	clrtoeol();
	}
	addch(UChar(c));
	value = 10 * value + (c - '0');
	got_number = TRUE;
	} else
	break;
	}
	if (got_number && value) {
	n = value;
	} else {
	n = 1;
	}

	if (c != ERR)
	my_label = keyname(c);
	switch (c) {
	case KEY_DOWN:
	case 'n':
	for (i = 0; i < n; i++)
	if (my_row < (num_lines - LINES + 1))
	my_row++;
	else
	break;
	break;

	case KEY_UP:
	case 'p':
	for (i = 0; i < n; i++)
	if (my_row > 0)
	my_row--;
	else
	break;
	break;

	case 'h':
	/* FALLTHRU */
	case KEY_HOME:
	my_row = 0;
	break;

	case '<':
	if ((shift -= 8) < 0)
	shift = 0;
	break;
	case '>':
	shift += 8;
	break;

	case 'e':
	/* FALLTHRU */
	case KEY_END:
	if (num_lines > LINES)
	my_row = (num_lines - LINES + 1);
	else
	my_row = (num_lines - 2);
	break;

	case CTRL('F'):
	/* FALLTHRU */
	case KEY_NPAGE:
	for (i = 0; i < n; i++) {
	if (my_row < (num_lines - 5))
	my_row += (LINES - 1);
	else
	my_row = (num_lines - 2);
	}
	break;

	case CTRL('B'):
	/* FALLTHRU */
	case KEY_PPAGE:
	for (i = 0; i < n; i++) {
	if (my_row >= LINES)
	my_row -= (LINES - 1);
	else
	my_row = 0;
	}
	break;

	case 'r':
	case KEY_RIGHT:
	shift += n;
	break;

	case 'l':
	case KEY_LEFT:
	shift -= n;
	if (shift < 0) {
	shift = 0;
	beep();
	}
	break;

	case 'q':
	case QUIT:
	case ESCAPE:
	done = TRUE;
	break;

	#ifdef KEY_RESIZE
	case KEY_RESIZE: /* ignore this; ncurses will repaint */
	break;
	#endif
	case 's':
	#if HAVE_HALFDELAY
	if (got_number) {
	halfdelay(my_delay = n);
	} else {
	nodelay(stdscr, FALSE);
	my_delay = -1;
	}
	#else
	nodelay(stdscr, FALSE);
	my_delay = -1;
	#endif
	break;
	case ' ':
	nodelay(stdscr, TRUE);
	my_delay = 0;
	break;
	case CTRL('L'):
	redrawwin(stdscr);
	break;
	case ERR:
	if (!my_delay)
	napms(50);
	break;
	case HELP_KEY_1:
	popup_msg(stdscr, help);
	break;
	default:
	beep();
	break;
	}
	if (c >= KEY_MIN \|\| (c > 0 && !isdigit(c))) {
	got_number = FALSE;
	value = 0;
	}
	}

	finish(0); /* we're done */
	}
	#else
	int
	main(void)
	{
	printf("This program requires the curses pad functions\n");
	ExitProgram(EXIT_FAILURE);
	}
	#endif