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diff --git a/ncurses-5.3/test/view.c b/ncurses-5.3/test/view.c
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+/*
+ * view.c -- a silly little viewer program
+ *
+ * written by Eric S. Raymond <esr@snark.thyrsus.com> December 1994
+ * to test the scrolling code in ncurses.
+ *
+ * modified by Thomas Dickey <dickey@clark.net> July 1995 to demonstrate
+ * the use of 'resizeterm()', and May 2000 to illustrate wide-character
+ * handling.
+ *
+ * Takes a filename argument. It's a simple file-viewer with various
+ * scroll-up and scroll-down commands.
+ *
+ * n -- scroll one line forward
+ * p -- scroll one line back
+ *
+ * Either command accepts a numeric prefix interpreted as a repeat count.
+ * Thus, typing `5n' should scroll forward 5 lines in the file.
+ *
+ * The way you can tell this is working OK is that, in the trace file,
+ * there should be one scroll operation plus a small number of line
+ * updates, as opposed to a whole-page update. This means the physical
+ * scroll operation worked, and the refresh() code only had to do a
+ * partial repaint.
+ *
+ * $Id$
+ */
+
+#include <ctype.h>
+#include <time.h>
+
+#include <test.priv.h>
+
+#if HAVE_TERMIOS_H
+# include <termios.h>
+#else
+# include <sgtty.h>
+#endif
+
+#if !defined(sun) || !HAVE_TERMIOS_H
+# if HAVE_SYS_IOCTL_H
+# include <sys/ioctl.h>
+# endif
+#endif
+
+#define my_pair 1
+
+/* This is needed to compile 'struct winsize' */
+#if NEED_PTEM_H
+#include <sys/stream.h>
+#include <sys/ptem.h>
+#endif
+
+static RETSIGTYPE finish(int sig) GCC_NORETURN;
+static void show_all(const char *tag);
+
+#if defined(SIGWINCH) && defined(TIOCGWINSZ) && HAVE_RESIZETERM
+#define CAN_RESIZE 1
+#else
+#define CAN_RESIZE 0
+#endif
+
+#if CAN_RESIZE
+static RETSIGTYPE adjust(int sig);
+static int interrupted;
+#endif
+
+static bool waiting = FALSE;
+static int shift = 0;
+static bool try_color = FALSE;
+
+static char *fname;
+static NCURSES_CH_T **my_lines;
+static NCURSES_CH_T **lptr;
+
+static void
+usage(void)
+{
+ static const char *msg[] =
+ {
+ "Usage: view [options] file"
+ ,""
+ ,"Options:"
+ ," -c use color if terminal supports it"
+ ," -i ignore INT, QUIT, TERM signals"
+ ," -n NUM specify maximum number of lines (default 1000)"
+#if defined(KEY_RESIZE)
+ ," -r use old-style sigwinch handler rather than KEY_RESIZE"
+#endif
+#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(EXIT_FAILURE);
+}
+
+static int
+ch_len(NCURSES_CH_T * src)
+{
+ int result = 0;
+#if USE_WIDEC_SUPPORT
+#endif
+
+#if USE_WIDEC_SUPPORT
+ while (getcchar(src++, NULL, NULL, NULL, NULL) > 0)
+ result++;
+#else
+ while (*src++)
+ result++;
+#endif
+ return result;
+}
+
+/*
+ * Allocate a string into an array of chtype's. If UTF-8 mode is
+ * active, translate the string accordingly.
+ */
+static NCURSES_CH_T *
+ch_dup(char *src)
+{
+ unsigned len = strlen(src);
+ NCURSES_CH_T *dst = typeMalloc(NCURSES_CH_T, len + 1);
+ unsigned j, k;
+#if USE_WIDEC_SUPPORT
+ wchar_t wstr[CCHARW_MAX + 1];
+ wchar_t wch;
+ int l = 0;
+ mbstate_t state;
+ size_t rc;
+ int width;
+#endif
+
+#if USE_WIDEC_SUPPORT
+ memset(&state, 0, sizeof(state));
+#endif
+ for (j = k = 0; j < len; j++) {
+#if USE_WIDEC_SUPPORT
+ rc = mbrtowc(&wch, src + j, len - j, &state);
+ if (rc == (size_t) -1 || rc == (size_t) -2)
+ break;
+ j += rc - 1;
+ if ((width = wcwidth(wch)) < 0)
+ break;
+ if ((width > 0 && l > 0) || l == CCHARW_MAX) {
+ wstr[l] = L'\0';
+ l = 0;
+ if (setcchar(dst + k, wstr, 0, 0, NULL) != OK)
+ break;
+ ++k;
+ }
+ if (width == 0 && l == 0)
+ wstr[l++] = L' ';
+ wstr[l++] = wch;
+#else
+ dst[k++] = src[j];
+#endif
+ }
+#if USE_WIDEC_SUPPORT
+ if (l > 0) {
+ wstr[l] = L'\0';
+ if (setcchar(dst + k, wstr, 0, 0, NULL) == OK)
+ ++k;
+ }
+ setcchar(dst + k, L"", 0, 0, NULL);
+#else
+ dst[k] = 0;
+#endif
+ return dst;
+}
+
+int
+main(int argc, char *argv[])
+{
+ int MAXLINES = 1000;
+ FILE *fp;
+ char buf[BUFSIZ];
+ int i;
+ int my_delay = 0;
+ NCURSES_CH_T **olptr;
+ int length = 0;
+ int value = 0;
+ bool done = FALSE;
+ bool got_number = FALSE;
+#if CAN_RESIZE
+ bool nonposix_resize = FALSE;
+#endif
+ const char *my_label = "Input";
+
+ setlocale(LC_ALL, "");
+
+#ifndef NCURSES_VERSION
+ /*
+ * We know ncurses will catch SIGINT if we don't establish our own handler.
+ * Other versions of curses may/may not catch it.
+ */
+ (void) signal(SIGINT, finish); /* arrange interrupts to terminate */
+#endif
+
+ while ((i = getopt(argc, argv, "cin:rtT:")) != EOF) {
+ switch (i) {
+ case 'c':
+ try_color = TRUE;
+ break;
+ case 'i':
+ signal(SIGINT, SIG_IGN);
+ signal(SIGQUIT, SIG_IGN);
+ signal(SIGTERM, SIG_IGN);
+ break;
+ case 'n':
+ if ((MAXLINES = atoi(optarg)) < 1)
+ usage();
+ break;
+#if CAN_RESIZE
+ case 'r':
+ nonposix_resize = TRUE;
+ break;
+#endif
+#ifdef TRACE
+ case 'T':
+ trace(atoi(optarg));
+ break;
+ case 't':
+ trace(TRACE_CALLS);
+ break;
+#endif
+ default:
+ usage();
+ }
+ }
+ if (optind + 1 != argc)
+ usage();
+
+ if ((my_lines = typeMalloc(NCURSES_CH_T *, MAXLINES + 2)) == 0)
+ usage();
+
+ fname = argv[optind];
+ if ((fp = fopen(fname, "r")) == 0) {
+ perror(fname);
+ ExitProgram(EXIT_FAILURE);
+ }
+#if CAN_RESIZE
+ if (nonposix_resize)
+ (void) signal(SIGWINCH, adjust); /* arrange interrupts to resize */
+#endif
+
+ /* slurp the file */
+ for (lptr = &my_lines[0]; (lptr - my_lines) < MAXLINES; lptr++) {
+ char temp[BUFSIZ], *s, *d;
+ int col;
+
+ if (fgets(buf, sizeof(buf), fp) == 0)
+ break;
+
+ /* convert tabs so that shift will work properly */
+ for (s = buf, d = temp, col = 0; (*d = *s) != '\0'; s++) {
+ if (*d == '\n') {
+ *d = '\0';
+ break;
+ } else if (*d == '\t') {
+ col = (col | 7) + 1;
+ while ((d - temp) != col)
+ *d++ = ' ';
+ } else
+#if USE_WIDEC_SUPPORT
+ col++, d++;
+#else
+ if (isprint(UChar(*d))) {
+ col++;
+ d++;
+ } else {
+ sprintf(d, "\\%03o", UChar(*s));
+ d += strlen(d);
+ col = (d - temp);
+ }
+#endif
+ }
+ *lptr = ch_dup(temp);
+ }
+ (void) fclose(fp);
+ length = lptr - my_lines;
+
+ (void) initscr(); /* initialize the curses library */
+ 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 */
+ 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(COLOR_PAIR(my_pair));
+ } else {
+ try_color = FALSE;
+ }
+ }
+
+ lptr = my_lines;
+ while (!done) {
+ int n, c;
+
+ if (!got_number)
+ show_all(my_label);
+
+ n = 0;
+ for (;;) {
+#if CAN_RESIZE
+ if (interrupted) {
+ adjust(0);
+ my_label = "interrupt";
+ }
+#endif
+ waiting = TRUE;
+ c = getch();
+ waiting = FALSE;
+ if ((c < 127) && isdigit(c)) {
+ if (!got_number) {
+ mvprintw(0, 0, "Count: ");
+ clrtoeol();
+ }
+ addch(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':
+ olptr = lptr;
+ for (i = 0; i < n; i++)
+ if ((lptr - my_lines) < (length - LINES + 1))
+ lptr++;
+ else
+ break;
+ wscrl(stdscr, lptr - olptr);
+ break;
+
+ case KEY_UP:
+ case 'p':
+ olptr = lptr;
+ for (i = 0; i < n; i++)
+ if (lptr > my_lines)
+ lptr--;
+ else
+ break;
+ wscrl(stdscr, lptr - olptr);
+ break;
+
+ case 'h':
+ case KEY_HOME:
+ lptr = my_lines;
+ break;
+
+ case 'e':
+ case KEY_END:
+ if (length > LINES)
+ lptr = my_lines + length - LINES + 1;
+ else
+ lptr = my_lines;
+ 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':
+ done = TRUE;
+ break;
+
+#ifdef KEY_RESIZE
+ case KEY_RESIZE: /* ignore this; ncurses will repaint */
+ break;
+#endif
+ case 's':
+ if (got_number) {
+ halfdelay(my_delay = n);
+ } else {
+ nodelay(stdscr, FALSE);
+ my_delay = -1;
+ }
+ break;
+ case ' ':
+ nodelay(stdscr, TRUE);
+ my_delay = 0;
+ break;
+ case ERR:
+ if (!my_delay)
+ napms(50);
+ break;
+ default:
+ beep();
+ break;
+ }
+ if (c >= KEY_MIN || (c > 0 && !isdigit(c))) {
+ got_number = FALSE;
+ value = 0;
+ }
+ }
+
+ finish(0); /* we're done */
+}
+
+static RETSIGTYPE
+finish(int sig)
+{
+ endwin();
+ ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
+}
+
+#if CAN_RESIZE
+/*
+ * This uses functions that are "unsafe", but it seems to work on SunOS and
+ * Linux. Usually: the "unsafe" refers to the functions that POSIX lists
+ * which may be called from a signal handler. Those do not include buffered
+ * I/O, which is used for instance in wrefresh(). To be really portable, you
+ * should use the KEY_RESIZE return (which relies on ncurses' sigwinch
+ * handler).
+ *
+ * The 'wrefresh(curscr)' is needed to force the refresh to start from the top
+ * of the screen -- some xterms mangle the bitmap while resizing.
+ */
+static RETSIGTYPE
+adjust(int sig)
+{
+ if (waiting || sig == 0) {
+ struct winsize size;
+
+ if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
+ resize_term(size.ws_row, size.ws_col);
+ wrefresh(curscr); /* Linux needs this */
+ show_all(sig ? "SIGWINCH" : "interrupt");
+ }
+ interrupted = FALSE;
+ } else {
+ interrupted = TRUE;
+ }
+ (void) signal(SIGWINCH, adjust); /* some systems need this */
+}
+#endif /* CAN_RESIZE */
+
+static void
+show_all(const char *tag)
+{
+ int i;
+ char temp[BUFSIZ];
+ NCURSES_CH_T *s;
+ time_t this_time;
+
+#if CAN_RESIZE
+ sprintf(temp, "%s (%3dx%3d) col %d ", tag, LINES, COLS, shift);
+ i = strlen(temp);
+ sprintf(temp + i, "view %.*s", (int) (sizeof(temp) - 7 - i), fname);
+#else
+ sprintf(temp, "view %.*s", (int) sizeof(temp) - 7, fname);
+#endif
+ move(0, 0);
+ printw("%.*s", COLS, temp);
+ clrtoeol();
+ this_time = time((time_t *) 0);
+ strcpy(temp, ctime(&this_time));
+ if ((i = strlen(temp)) != 0) {
+ temp[--i] = 0;
+ if (move(0, COLS - i - 2) != ERR)
+ printw(" %s", temp);
+ }
+
+ scrollok(stdscr, FALSE); /* prevent screen from moving */
+ for (i = 1; i < LINES; i++) {
+ move(i, 0);
+ printw("%3ld:", (long) (lptr + i - my_lines));
+ clrtoeol();
+ if ((s = lptr[i - 1]) != 0) {
+ int len = ch_len(s);
+ if (len > shift)
+#if USE_WIDEC_SUPPORT
+ add_wchstr(s + shift);
+#else
+ addchstr(s + shift);
+#endif
+ if (try_color)
+ wchgat(stdscr, -1, A_NORMAL, my_pair, NULL);
+ }
+ }
+ setscrreg(1, LINES - 1);
+ scrollok(stdscr, TRUE);
+ refresh();
+}
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