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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 1.70 2008/11/16 00:19:59 juergen Exp $
56 #include <test.priv.h>
60 #undef CTRL /* conflict on AIX 5.2 with <sys/ioctl.h> */
65 #if !defined(__MINGW32__)
70 #if !defined(sun) || !HAVE_TERMIOS_H
72 # include <sys/ioctl.h>
78 /* This is needed to compile 'struct winsize' */
80 #include <sys/stream.h>
85 #if HAVE_MBTOWC && HAVE_MBLEN
86 #define reset_mbytes(state) mblen(NULL, 0), mbtowc(NULL, NULL, 0)
87 #define count_mbytes(buffer,length,state) mblen(buffer,length)
88 #define check_mbytes(wch,buffer,length,state) \
89 (int) mbtowc(&wch, buffer, length)
91 #elif HAVE_MBRTOWC && HAVE_MBRLEN
92 #define reset_mbytes(state) init_mb(state)
93 #define count_mbytes(buffer,length,state) mbrlen(buffer,length,&state)
94 #define check_mbytes(wch,buffer,length,state) \
95 (int) mbrtowc(&wch, buffer, length, &state)
99 #endif /* USE_WIDEC_SUPPORT */
101 static RETSIGTYPE finish(int sig) GCC_NORETURN;
102 static void show_all(const char *tag);
104 #if defined(SIGWINCH) && defined(TIOCGWINSZ) && HAVE_RESIZE_TERM
111 static RETSIGTYPE adjust(int sig);
112 static int interrupted;
115 static bool waiting = FALSE;
116 static int shift = 0;
117 static bool try_color = FALSE;
120 static NCURSES_CH_T **vec_lines;
121 static NCURSES_CH_T **lptr;
122 static int num_lines;
127 static const char *msg[] =
129 "Usage: view [options] file"
132 ," -c use color if terminal supports it"
133 ," -i ignore INT, QUIT, TERM signals"
134 ," -n NUM specify maximum number of lines (default 1000)"
135 #if defined(KEY_RESIZE)
136 ," -r use old-style sigwinch handler rather than KEY_RESIZE"
139 ," -t trace screen updates"
140 ," -T NUM specify trace mask"
144 for (n = 0; n < SIZEOF(msg); n++)
145 fprintf(stderr, "%s\n", msg[n]);
146 ExitProgram(EXIT_FAILURE);
150 ch_len(NCURSES_CH_T * src)
153 #if USE_WIDEC_SUPPORT
156 #if USE_WIDEC_SUPPORT
157 while (getcchar(src++, NULL, NULL, NULL, NULL) > 0)
167 * Allocate a string into an array of chtype's. If UTF-8 mode is
168 * active, translate the string accordingly.
170 static NCURSES_CH_T *
173 unsigned len = strlen(src);
174 NCURSES_CH_T *dst = typeMalloc(NCURSES_CH_T, len + 1);
176 #if USE_WIDEC_SUPPORT
177 wchar_t wstr[CCHARW_MAX + 1];
185 #endif /* USE_WIDEC_SUPPORT */
187 #if USE_WIDEC_SUPPORT
190 for (j = k = 0; j < len; j++) {
191 #if USE_WIDEC_SUPPORT
192 rc = check_mbytes(wch, src + j, len - j, state);
193 if (rc == (size_t) -1 || rc == (size_t) -2)
196 if ((width = wcwidth(wch)) < 0)
198 if ((width > 0 && l > 0) || l == CCHARW_MAX) {
201 if (setcchar(dst + k, wstr, 0, 0, NULL) != OK)
205 if (width == 0 && l == 0)
212 #if USE_WIDEC_SUPPORT
215 if (setcchar(dst + k, wstr, 0, 0, NULL) == OK)
219 setcchar(dst + k, wstr, 0, 0, NULL);
227 main(int argc, char *argv[])
234 NCURSES_CH_T **olptr;
237 bool got_number = FALSE;
239 bool nonposix_resize = FALSE;
241 const char *my_label = "Input";
243 setlocale(LC_ALL, "");
245 #ifndef NCURSES_VERSION
247 * We know ncurses will catch SIGINT if we don't establish our own handler.
248 * Other versions of curses may/may not catch it.
250 (void) signal(SIGINT, finish); /* arrange interrupts to terminate */
253 while ((i = getopt(argc, argv, "cin:rtT:")) != -1) {
262 if ((MAXLINES = atoi(optarg)) < 1 ||
268 nonposix_resize = TRUE;
273 trace((unsigned) atoi(optarg));
283 if (optind + 1 != argc)
286 if ((vec_lines = typeMalloc(NCURSES_CH_T *, MAXLINES + 2)) == 0)
289 fname = argv[optind];
290 if ((fp = fopen(fname, "r")) == 0) {
292 ExitProgram(EXIT_FAILURE);
296 (void) signal(SIGWINCH, adjust); /* arrange interrupts to resize */
300 for (lptr = &vec_lines[0]; (lptr - vec_lines) < MAXLINES; lptr++) {
301 char temp[BUFSIZ], *s, *d;
304 if (fgets(buf, sizeof(buf), fp) == 0)
307 /* convert tabs so that shift will work properly */
308 for (s = buf, d = temp, col = 0; (*d = *s) != '\0'; s++) {
312 } else if (*d == '\t') {
314 while ((d - temp) != col)
317 #if USE_WIDEC_SUPPORT
320 if (isprint(UChar(*d))) {
324 sprintf(d, "\\%03o", UChar(*s));
330 *lptr = ch_dup(temp);
333 num_lines = lptr - vec_lines;
335 (void) initscr(); /* initialize the curses library */
336 keypad(stdscr, TRUE); /* enable keyboard mapping */
337 (void) nonl(); /* tell curses not to do NL->CR/NL on output */
338 (void) cbreak(); /* take input chars one at a time, no wait for \n */
339 (void) noecho(); /* don't echo input */
340 nodelay(stdscr, TRUE);
341 idlok(stdscr, TRUE); /* allow use of insert/delete line */
346 init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
347 bkgd(COLOR_PAIR(my_pair));
365 my_label = "interrupt";
371 if ((c < 127) && isdigit(c)) {
373 mvprintw(0, 0, "Count: ");
377 value = 10 * value + (c - '0');
382 if (got_number && value) {
389 my_label = keyname(c);
394 for (i = 0; i < n; i++)
395 if ((lptr - vec_lines) < (num_lines - LINES + 1))
405 for (i = 0; i < n; i++)
406 if (lptr > vec_lines)
420 if (num_lines > LINES)
421 lptr = vec_lines + num_lines - LINES + 1;
445 case KEY_RESIZE: /* ignore this; ncurses will repaint */
450 halfdelay(my_delay = n);
452 nodelay(stdscr, FALSE);
457 nodelay(stdscr, TRUE);
468 if (c >= KEY_MIN || (c > 0 && !isdigit(c))) {
474 finish(0); /* we're done */
482 if (vec_lines != 0) {
484 for (n = 0; n < num_lines; ++n) {
490 ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
495 * This uses functions that are "unsafe", but it seems to work on SunOS and
496 * Linux. Usually: the "unsafe" refers to the functions that POSIX lists
497 * which may be called from a signal handler. Those do not include buffered
498 * I/O, which is used for instance in wrefresh(). To be really portable, you
499 * should use the KEY_RESIZE return (which relies on ncurses' sigwinch
502 * The 'wrefresh(curscr)' is needed to force the refresh to start from the top
503 * of the screen -- some xterms mangle the bitmap while resizing.
508 if (waiting || sig == 0) {
511 if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
512 resize_term(size.ws_row, size.ws_col);
513 wrefresh(curscr); /* Linux needs this */
514 show_all(sig ? "SIGWINCH" : "interrupt");
520 (void) signal(SIGWINCH, adjust); /* some systems need this */
522 #endif /* CAN_RESIZE */
525 show_all(const char *tag)
533 sprintf(temp, "%.20s (%3dx%3d) col %d ", tag, LINES, COLS, shift);
535 if ((i + 7) < (int) sizeof(temp))
536 sprintf(temp + i, "view %.*s", (int) (sizeof(temp) - 7 - i), fname);
539 sprintf(temp, "view %.*s", (int) sizeof(temp) - 7, fname);
542 printw("%.*s", COLS, temp);
544 this_time = time((time_t *) 0);
545 strcpy(temp, ctime(&this_time));
546 if ((i = strlen(temp)) != 0) {
548 if (move(0, COLS - i - 2) != ERR)
552 scrollok(stdscr, FALSE); /* prevent screen from moving */
553 for (i = 1; i < LINES; i++) {
555 printw("%3ld:", (long) (lptr + i - vec_lines));
557 if ((s = lptr[i - 1]) != 0) {
560 #if USE_WIDEC_SUPPORT
561 add_wchstr(s + shift);
566 #if defined(NCURSES_VERSION) || defined(HAVE_WCHGAT)
568 wchgat(stdscr, -1, A_NORMAL, my_pair, NULL);
572 setscrreg(1, LINES - 1);
573 scrollok(stdscr, TRUE);