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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 1.81 2010/11/14 01:06:02 tom 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) IGNORE_RC(mblen(NULL, 0)), IGNORE_RC(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
157 #if USE_WIDEC_SUPPORT
159 TEST_CCHAR(src, count, {
175 * Allocate a string into an array of chtype's. If UTF-8 mode is
176 * active, translate the string accordingly.
178 static NCURSES_CH_T *
181 unsigned len = (unsigned) strlen(src);
182 NCURSES_CH_T *dst = typeMalloc(NCURSES_CH_T, len + 1);
184 #if USE_WIDEC_SUPPORT
185 wchar_t wstr[CCHARW_MAX + 1];
193 #endif /* USE_WIDEC_SUPPORT */
195 #if USE_WIDEC_SUPPORT
198 for (j = k = 0; j < len; j++) {
199 #if USE_WIDEC_SUPPORT
200 rc = (size_t) check_mbytes(wch, src + j, len - j, state);
201 if (rc == (size_t) -1 || rc == (size_t) -2)
204 if ((width = wcwidth(wch)) < 0)
206 if ((width > 0 && l > 0) || l == CCHARW_MAX) {
209 if (setcchar(dst + k, wstr, 0, 0, NULL) != OK)
213 if (width == 0 && l == 0)
217 dst[k++] = (chtype) UChar(src[j]);
220 #if USE_WIDEC_SUPPORT
223 if (setcchar(dst + k, wstr, 0, 0, NULL) == OK)
227 setcchar(dst + k, wstr, 0, 0, NULL);
235 main(int argc, char *argv[])
242 NCURSES_CH_T **olptr;
245 bool got_number = FALSE;
247 bool nonposix_resize = FALSE;
249 const char *my_label = "Input";
251 setlocale(LC_ALL, "");
253 #ifndef NCURSES_VERSION
255 * We know ncurses will catch SIGINT if we don't establish our own handler.
256 * Other versions of curses may/may not catch it.
258 (void) signal(SIGINT, finish); /* arrange interrupts to terminate */
261 while ((i = getopt(argc, argv, "cin:rtT:")) != -1) {
270 if ((MAXLINES = atoi(optarg)) < 1 ||
276 nonposix_resize = TRUE;
281 trace((unsigned) atoi(optarg));
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 */
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 /* convert tabs so that shift will work properly */
318 for (s = buf, d = temp, col = 0; (*d = *s) != '\0'; s++) {
322 } else if (*d == '\t') {
324 while ((d - temp) != col)
327 #if USE_WIDEC_SUPPORT
330 if (isprint(UChar(*d))) {
334 sprintf(d, "\\%03o", UChar(*s));
336 col = (int) (d - temp);
340 *lptr = ch_dup(temp);
343 num_lines = (int) (lptr - vec_lines);
345 (void) initscr(); /* initialize the curses library */
346 keypad(stdscr, TRUE); /* enable keyboard mapping */
347 (void) nonl(); /* tell curses not to do NL->CR/NL on output */
348 (void) cbreak(); /* take input chars one at a time, no wait for \n */
349 (void) noecho(); /* don't echo input */
350 nodelay(stdscr, TRUE);
351 idlok(stdscr, TRUE); /* allow use of insert/delete line */
356 init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
357 bkgd(COLOR_PAIR(my_pair));
374 my_label = "interrupt";
380 if ((c < 127) && isdigit(c)) {
382 MvPrintw(0, 0, "Count: ");
386 value = 10 * value + (c - '0');
391 if (got_number && value) {
398 my_label = keyname(c);
403 for (i = 0; i < n; i++)
404 if ((lptr - vec_lines) < (num_lines - LINES + 1))
408 scrl((int) (lptr - olptr));
414 for (i = 0; i < n; i++)
415 if (lptr > vec_lines)
419 scrl((int) (lptr - olptr));
429 if (num_lines > LINES)
430 lptr = vec_lines + num_lines - LINES + 1;
454 case KEY_RESIZE: /* ignore this; ncurses will repaint */
459 halfdelay(my_delay = n);
461 nodelay(stdscr, FALSE);
466 nodelay(stdscr, TRUE);
477 if (c >= KEY_MIN || (c > 0 && !isdigit(c))) {
483 finish(0); /* we're done */
491 if (vec_lines != 0) {
493 for (n = 0; n < num_lines; ++n) {
499 ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
504 * This uses functions that are "unsafe", but it seems to work on SunOS.
505 * Usually: the "unsafe" refers to the functions that POSIX lists which may be
506 * called from a signal handler. Those do not include buffered I/O, which is
507 * used for instance in wrefresh(). To be really portable, you should use the
508 * KEY_RESIZE return (which relies on ncurses' sigwinch handler).
510 * The 'wrefresh(curscr)' is needed to force the refresh to start from the top
511 * of the screen -- some xterms mangle the bitmap while resizing.
516 if (waiting || sig == 0) {
519 if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
520 resize_term(size.ws_row, size.ws_col);
522 show_all(sig ? "SIGWINCH" : "interrupt");
528 (void) signal(SIGWINCH, adjust); /* some systems need this */
530 #endif /* CAN_RESIZE */
533 show_all(const char *tag)
541 sprintf(temp, "%.20s (%3dx%3d) col %d ", tag, LINES, COLS, shift);
542 i = (int) strlen(temp);
543 if ((i + 7) < (int) sizeof(temp)) {
544 sprintf(temp + i, "view %.*s",
545 (int) (sizeof(temp) - 7 - (size_t) i),
550 sprintf(temp, "view %.*s", (int) sizeof(temp) - 7, fname);
553 printw("%.*s", COLS, temp);
555 this_time = time((time_t *) 0);
556 strcpy(temp, ctime(&this_time));
557 if ((i = (int) strlen(temp)) != 0) {
559 if (move(0, COLS - i - 2) != ERR)
563 scrollok(stdscr, FALSE); /* prevent screen from moving */
564 for (i = 1; i < LINES; i++) {
566 printw("%3ld:", (long) (lptr + i - vec_lines));
568 if ((s = lptr[i - 1]) != 0) {
571 #if USE_WIDEC_SUPPORT
572 add_wchstr(s + shift);
577 #if defined(NCURSES_VERSION) || defined(HAVE_WCHGAT)
579 wchgat(stdscr, -1, A_NORMAL, my_pair, NULL);
583 setscrreg(1, LINES - 1);
584 scrollok(stdscr, TRUE);