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29 * view.c -- a silly little viewer program
31 * written by Eric S. Raymond <esr@snark.thyrsus.com> December 1994
32 * to test the scrolling code in ncurses.
34 * modified by Thomas Dickey <dickey@clark.net> July 1995 to demonstrate
35 * the use of 'resizeterm()', and May 2000 to illustrate wide-character
38 * Takes a filename argument. It's a simple file-viewer with various
39 * scroll-up and scroll-down commands.
41 * n -- scroll one line forward
42 * p -- scroll one line back
44 * Either command accepts a numeric prefix interpreted as a repeat count.
45 * Thus, typing `5n' should scroll forward 5 lines in the file.
47 * The way you can tell this is working OK is that, in the trace file,
48 * there should be one scroll operation plus a small number of line
49 * updates, as opposed to a whole-page update. This means the physical
50 * scroll operation worked, and the refresh() code only had to do a
53 * $Id: view.c,v 1.94 2013/09/28 21:58:42 tom Exp $
56 #include <test.priv.h>
57 #include <widechars.h>
61 #undef CTRL /* conflict on AIX 5.2 with <sys/ioctl.h> */
66 #if !defined(__MINGW32__)
71 #if !defined(sun) || !HAVE_TERMIOS_H
73 # include <sys/ioctl.h>
79 /* This is needed to compile 'struct winsize' */
81 #include <sys/stream.h>
86 #define CTRL(x) ((x) & 0x1f)
88 static void finish(int sig) GCC_NORETURN;
89 static void show_all(const char *tag);
91 #if defined(SIGWINCH) && defined(TIOCGWINSZ) && HAVE_RESIZE_TERM
98 static void adjust(int sig);
99 static int interrupted;
100 static bool waiting = FALSE;
103 static int shift = 0;
104 static bool try_color = FALSE;
107 static NCURSES_CH_T **vec_lines;
108 static NCURSES_CH_T **lptr;
109 static int num_lines;
111 static void usage(void) GCC_NORETURN;
116 static const char *msg[] =
118 "Usage: view [options] file"
121 ," -c use color if terminal supports it"
122 ," -i ignore INT, QUIT, TERM signals"
123 ," -n NUM specify maximum number of lines (default 1000)"
124 #if defined(KEY_RESIZE)
125 ," -r use old-style sigwinch handler rather than KEY_RESIZE"
127 ," -s start in single-step mode, waiting for input"
129 ," -t trace screen updates"
130 ," -T NUM specify trace mask"
134 for (n = 0; n < SIZEOF(msg); n++)
135 fprintf(stderr, "%s\n", msg[n]);
136 ExitProgram(EXIT_FAILURE);
140 ch_len(NCURSES_CH_T * src)
143 #if USE_WIDEC_SUPPORT
147 #if USE_WIDEC_SUPPORT
149 TEST_CCHAR(src, count, {
165 * Allocate a string into an array of chtype's. If UTF-8 mode is
166 * active, translate the string accordingly.
168 static NCURSES_CH_T *
171 unsigned len = (unsigned) strlen(src);
172 NCURSES_CH_T *dst = typeMalloc(NCURSES_CH_T, len + 1);
174 #if USE_WIDEC_SUPPORT
175 wchar_t wstr[CCHARW_MAX + 1];
183 #endif /* USE_WIDEC_SUPPORT */
185 #if USE_WIDEC_SUPPORT
188 for (j = k = 0; j < len; j++) {
189 #if USE_WIDEC_SUPPORT
190 rc = (size_t) check_mbytes(wch, src + j, len - j, state);
191 if (rc == (size_t) -1 || rc == (size_t) -2)
194 if ((width = wcwidth(wch)) < 0)
196 if ((width > 0 && l > 0) || l == CCHARW_MAX) {
199 if (setcchar(dst + k, wstr, 0, 0, NULL) != OK)
203 if (width == 0 && l == 0)
207 dst[k++] = (chtype) UChar(src[j]);
210 #if USE_WIDEC_SUPPORT
213 if (setcchar(dst + k, wstr, 0, 0, NULL) == OK)
217 setcchar(dst + k, wstr, 0, 0, NULL);
225 main(int argc, char *argv[])
232 NCURSES_CH_T **olptr;
235 bool got_number = FALSE;
236 bool single_step = FALSE;
238 bool nonposix_resize = FALSE;
240 const char *my_label = "Input";
242 setlocale(LC_ALL, "");
244 #ifndef NCURSES_VERSION
246 * We know ncurses will catch SIGINT if we don't establish our own handler.
247 * Other versions of curses may/may not catch it.
249 (void) signal(SIGINT, finish); /* arrange interrupts to terminate */
252 while ((i = getopt(argc, argv, "cin:rstT:")) != -1) {
261 if ((MAXLINES = atoi(optarg)) < 1 ||
267 nonposix_resize = TRUE;
277 int tvalue = (int) strtol(optarg, &next, 0);
278 if (tvalue < 0 || (next != 0 && *next != 0))
280 trace((unsigned) tvalue);
291 if (optind + 1 != argc)
294 if ((vec_lines = typeCalloc(NCURSES_CH_T *, (size_t) MAXLINES + 2)) == 0)
297 assert(vec_lines != 0);
299 fname = argv[optind];
300 if ((fp = fopen(fname, "r")) == 0) {
302 ExitProgram(EXIT_FAILURE);
306 (void) signal(SIGWINCH, adjust); /* arrange interrupts to resize */
309 Trace(("slurp the file"));
310 for (lptr = &vec_lines[0]; (lptr - vec_lines) < MAXLINES; lptr++) {
311 char temp[BUFSIZ], *s, *d;
314 if (fgets(buf, sizeof(buf), fp) == 0)
317 #if USE_WIDEC_SUPPORT
318 if (lptr == vec_lines) {
319 if (!memcmp("", buf, 3)) {
324 } while ((*d++ = *s++) != '\0');
329 /* convert tabs and nonprinting chars so that shift will work properly */
330 for (s = buf, d = temp, col = 0; (*d = *s) != '\0'; s++) {
340 } else if (*d == '\t') {
342 while ((d - temp) != col)
345 #if USE_WIDEC_SUPPORT
348 if (isprint(UChar(*d))) {
352 sprintf(d, "\\%03o", UChar(*s));
354 col = (int) (d - temp);
358 *lptr = ch_dup(temp);
361 num_lines = (int) (lptr - vec_lines);
363 (void) initscr(); /* initialize the curses library */
364 keypad(stdscr, TRUE); /* enable keyboard mapping */
365 (void) nonl(); /* tell curses not to do NL->CR/NL on output */
366 (void) cbreak(); /* take input chars one at a time, no wait for \n */
367 (void) noecho(); /* don't echo input */
369 nodelay(stdscr, TRUE);
370 idlok(stdscr, TRUE); /* allow use of insert/delete line */
375 init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
376 bkgd((chtype) COLOR_PAIR(my_pair));
393 my_label = "interrupt";
401 if ((c < 127) && isdigit(c)) {
403 MvPrintw(0, 0, "Count: ");
407 value = 10 * value + (c - '0');
412 if (got_number && value) {
419 my_label = keyname(c);
424 for (i = 0; i < n; i++)
425 if ((lptr - vec_lines) < (num_lines - LINES + 1))
429 scrl((int) (lptr - olptr));
435 for (i = 0; i < n; i++)
436 if (lptr > vec_lines)
440 scrl((int) (lptr - olptr));
450 if (num_lines > LINES)
451 lptr = vec_lines + num_lines - LINES + 1;
475 case KEY_RESIZE: /* ignore this; ncurses will repaint */
480 halfdelay(my_delay = n);
482 nodelay(stdscr, FALSE);
487 nodelay(stdscr, TRUE);
501 if (c >= KEY_MIN || (c > 0 && !isdigit(c))) {
507 finish(0); /* we're done */
515 if (vec_lines != 0) {
517 for (n = 0; n < num_lines; ++n) {
523 ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
528 * This uses functions that are "unsafe", but it seems to work on SunOS.
529 * Usually: the "unsafe" refers to the functions that POSIX lists which may be
530 * called from a signal handler. Those do not include buffered I/O, which is
531 * used for instance in wrefresh(). To be really portable, you should use the
532 * KEY_RESIZE return (which relies on ncurses' sigwinch handler).
534 * The 'wrefresh(curscr)' is needed to force the refresh to start from the top
535 * of the screen -- some xterms mangle the bitmap while resizing.
540 if (waiting || sig == 0) {
543 if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
544 resize_term(size.ws_row, size.ws_col);
546 show_all(sig ? "SIGWINCH" : "interrupt");
552 (void) signal(SIGWINCH, adjust); /* some systems need this */
554 #endif /* CAN_RESIZE */
557 show_all(const char *tag)
565 sprintf(temp, "%.20s (%3dx%3d) col %d ", tag, LINES, COLS, shift);
566 i = (int) strlen(temp);
567 if ((i + 7) < (int) sizeof(temp)) {
568 sprintf(temp + i, "view %.*s",
569 (int) (sizeof(temp) - 7 - (size_t) i),
574 sprintf(temp, "view %.*s", (int) sizeof(temp) - 7, fname);
577 printw("%.*s", COLS, temp);
579 this_time = time((time_t *) 0);
580 strncpy(temp, ctime(&this_time), (size_t) 30);
581 if ((i = (int) strlen(temp)) != 0) {
583 if (move(0, COLS - i - 2) != ERR)
587 scrollok(stdscr, FALSE); /* prevent screen from moving */
588 for (i = 1; i < LINES; i++) {
590 printw("%3ld:", (long) (lptr + i - vec_lines));
592 if ((s = lptr[i - 1]) != 0) {
595 #if USE_WIDEC_SUPPORT
596 add_wchstr(s + shift);
601 #if defined(NCURSES_VERSION) || defined(HAVE_WCHGAT)
603 wchgat(stdscr, -1, A_NORMAL, my_pair, NULL);
607 setscrreg(1, LINES - 1);
608 scrollok(stdscr, TRUE);