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670 lines
15 KiB
C
670 lines
15 KiB
C
/****************************************************************************
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* Copyright 2019-2021,2022 Thomas E. Dickey *
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* Copyright 1998-2016,2017 Free Software Foundation, Inc. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the *
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* "Software"), to deal in the Software without restriction, including *
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* without limitation the rights to use, copy, modify, merge, publish, *
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* distribute, distribute with modifications, sublicense, and/or sell *
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* copies of the Software, and to permit persons to whom the Software is *
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* furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included *
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* in all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Except as contained in this notice, the name(s) of the above copyright *
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* holders shall not be used in advertising or otherwise to promote the *
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* sale, use or other dealings in this Software without prior written *
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* authorization. *
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****************************************************************************/
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/*
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* view.c -- a silly little viewer program
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*
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* written by Eric S. Raymond <esr@snark.thyrsus.com> December 1994
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* to test the scrolling code in ncurses.
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*
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* modified by Thomas Dickey <dickey@clark.net> July 1995 to demonstrate
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* the use of 'resizeterm()', and May 2000 to illustrate wide-character
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* handling. This program intentionally does not use pads, to allow testing
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* with less-capable implementations of curses.
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*
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* Takes a filename argument. It's a simple file-viewer with various
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* scroll-up and scroll-down commands.
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*
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* n -- scroll one line forward
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* p -- scroll one line back
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*
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* Either command accepts a numeric prefix interpreted as a repeat count.
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* Thus, typing `5n' should scroll forward 5 lines in the file.
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*
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* The way you can tell this is working OK is that, in the trace file,
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* there should be one scroll operation plus a small number of line
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* updates, as opposed to a whole-page update. This means the physical
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* scroll operation worked, and the refresh() code only had to do a
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* partial repaint.
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*
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* $Id: view.c,v 1.145 2022/12/04 00:40:11 tom Exp $
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*/
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#include <test.priv.h>
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#include <widechars.h>
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#include <popup_msg.h>
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#include <sys/stat.h>
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#include <time.h>
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static GCC_NORETURN void finish(int sig);
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#define my_pair 1
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static int shift = 0;
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static bool try_color = FALSE;
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static char *fname;
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static NCURSES_CH_T **vec_lines;
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static NCURSES_CH_T **lptr;
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static int num_lines;
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#if USE_WIDEC_SUPPORT
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static bool n_option = FALSE;
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#endif
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static GCC_NORETURN void
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failed(const char *msg)
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{
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endwin();
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fprintf(stderr, "%s\n", msg);
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ExitProgram(EXIT_FAILURE);
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}
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static int
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ch_len(NCURSES_CH_T *src)
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{
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int result = 0;
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#if USE_WIDEC_SUPPORT
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for (;;) {
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int count;
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TEST_CCHAR(src, count, {
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int len = wcwidth(test_wch[0]);
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result += (len > 0) ? len : 1;
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++src;
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}
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, {
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break;
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})
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}
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#else
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while (*src++)
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result++;
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#endif
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return result;
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}
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static void
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finish(int sig)
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{
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endwin();
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#if NO_LEAKS
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if (vec_lines != 0) {
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int n;
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for (n = 0; n < num_lines; ++n) {
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free(vec_lines[n]);
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}
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free(vec_lines);
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}
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#endif
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ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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static void
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show_all(const char *tag)
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{
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int i;
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int digits;
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char temp[BUFSIZ];
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time_t this_time;
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for (digits = 1, i = num_lines; i > 0; i /= 10) {
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++digits;
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}
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_nc_SPRINTF(temp, _nc_SLIMIT(sizeof(temp))
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"view %.*s", (int) strlen(tag), tag);
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i = (int) strlen(temp);
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_nc_SPRINTF(temp + i, _nc_SLIMIT(sizeof(temp) - (size_t) i)
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" %.*s", (int) sizeof(temp) - i - 2, fname);
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move(0, 0);
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printw("%.*s", COLS, temp);
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clrtoeol();
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this_time = time((time_t *) 0);
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_nc_STRNCPY(temp, ctime(&this_time), (size_t) 30);
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if ((i = (int) strlen(temp)) != 0) {
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temp[--i] = 0;
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if (move(0, COLS - i - 2) != ERR)
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printw(" %s", temp);
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}
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scrollok(stdscr, FALSE); /* prevent screen from moving */
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for (i = 1; i < LINES; i++) {
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NCURSES_CH_T *s;
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int len;
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int actual = (int) (lptr + i - vec_lines);
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if (actual > num_lines) {
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if (i < LINES - 1) {
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int y, x;
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getyx(stdscr, y, x);
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move(i, 0);
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clrtobot();
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move(y, x);
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}
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break;
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}
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move(i, 0);
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printw("%*d:", digits, actual);
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clrtoeol();
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if ((s = lptr[i - 1]) == 0) {
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continue;
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}
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len = ch_len(s);
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if (len > shift) {
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#if USE_WIDEC_SUPPORT
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/*
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* An index into an array of cchar_t's is not necessarily the same
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* as the column-offset. A pad would do this directly. Here we
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* must translate (or compute a table of offsets).
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*/
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{
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int j;
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int width = 1;
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for (j = actual = 0; j < shift; ++j) {
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int count;
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TEST_CCHAR(s + j, count, {
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width = wcwidth(test_wch[0]);
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}
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, {
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width = 1;
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});
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actual += width;
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if (actual > shift) {
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break;
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} else if (actual == shift) {
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++j;
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break;
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}
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}
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if (actual < len) {
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if (actual > shift)
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addch('<');
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add_wchstr(s + j + (actual > shift));
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}
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}
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#else
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addchstr(s + shift);
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#endif
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}
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#if defined(NCURSES_VERSION) || defined(HAVE_WCHGAT)
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if (try_color)
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wchgat(stdscr, -1, WA_NORMAL, my_pair, NULL);
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#endif
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}
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setscrreg(1, LINES - 1);
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scrollok(stdscr, TRUE);
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refresh();
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}
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static void
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read_file(const char *filename)
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{
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FILE *fp;
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int pass;
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int k;
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int width;
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size_t j;
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size_t len;
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struct stat sb;
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char *my_blob;
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char **my_vec = 0;
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WINDOW *my_win;
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if (stat(filename, &sb) != 0
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|| (sb.st_mode & S_IFMT) != S_IFREG) {
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failed("input is not a file");
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}
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if (sb.st_size == 0) {
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failed("input is empty");
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}
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if ((fp = fopen(filename, "r")) == 0) {
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failed("cannot open input-file");
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}
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if ((my_blob = malloc((size_t) sb.st_size + 1)) == 0) {
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failed("cannot allocate memory for input-file");
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}
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len = fread(my_blob, sizeof(char), (size_t) sb.st_size, fp);
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fclose(fp);
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if (len > (size_t) sb.st_size)
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len = (size_t) sb.st_size;
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my_blob[len] = '\0';
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for (pass = 0; pass < 2; ++pass) {
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char *base = my_blob;
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k = 0;
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for (j = 0; j < len; ++j) {
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if (my_blob[j] == '\n') {
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if (pass) {
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my_vec[k] = base;
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my_blob[j] = '\0';
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}
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base = my_blob + j + 1;
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++k;
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}
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}
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if (base != (my_blob + j)) {
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if (pass)
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my_vec[k] = base;
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++k;
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}
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num_lines = k;
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if (pass == 0) {
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if (((my_vec = typeCalloc(char *, (size_t) k + 2)) == 0)) {
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failed("cannot allocate line-vector #1");
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}
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} else {
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if (my_vec[0] == NULL)
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my_vec[0] = my_blob;
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}
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}
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#if USE_WIDEC_SUPPORT
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if (!memcmp("\357\273\277", my_blob, 3)) {
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char *s = my_blob + 3;
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char *d = my_blob;
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Trace(("trim BOM"));
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do {
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} while ((*d++ = *s++) != '\0');
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}
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#endif
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width = (int) strlen(my_vec[0]);
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for (k = 1; my_vec[k]; ++k) {
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int check = (int) (my_vec[k] - my_vec[k - 1]);
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if (width < check)
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width = check;
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}
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width = (width + 1) * 5;
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my_win = newwin(2, width, 0, 0);
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if (my_win == 0) {
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failed("cannot allocate temporary window");
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}
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if ((vec_lines = typeCalloc(NCURSES_CH_T *, (size_t) num_lines + 2)) == 0) {
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failed("cannot allocate line-vector #2");
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}
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/*
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* Use the curses library for rendering, including tab-conversion. This
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* will not make the resulting array's indices correspond to column for
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* lines containing double-width cells because the "in_wch" functions will
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* ignore the skipped cells. Use pads for that sort of thing.
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*/
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Trace(("slurp the file"));
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for (k = 0; my_vec[k]; ++k) {
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char *s;
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int y, x;
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#if USE_WIDEC_SUPPORT
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char *last = my_vec[k] + (int) strlen(my_vec[k]);
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wchar_t wch[2];
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size_t rc;
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#ifndef state_unused
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mbstate_t state;
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#endif
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#endif /* USE_WIDEC_SUPPORT */
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werase(my_win);
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wmove(my_win, 0, 0);
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#if USE_WIDEC_SUPPORT
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wch[1] = 0;
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reset_mbytes(state);
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#endif
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for (s = my_vec[k]; *s != '\0'; ++s) {
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#if USE_WIDEC_SUPPORT
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if (!n_option) {
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rc = (size_t) check_mbytes(wch[0], s, (size_t) (last - s), state);
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if ((long) rc == -1 || (long) rc == -2) {
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break;
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}
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s += rc - 1;
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waddwstr(my_win, wch);
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} else
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#endif
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waddch(my_win, *s & 0xff);
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}
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getyx(my_win, y, x);
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if (y)
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x = width - 1;
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wmove(my_win, 0, 0);
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/* "x + 1" works with standard curses; some implementations are buggy */
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if ((vec_lines[k] = typeCalloc(NCURSES_CH_T, x + width + 1)) == 0) {
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failed("cannot allocate line-vector #3");
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}
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#if USE_WIDEC_SUPPORT
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win_wchnstr(my_win, vec_lines[k], x);
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#else
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winchnstr(my_win, vec_lines[k], x);
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#endif
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}
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delwin(my_win);
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free(my_vec);
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free(my_blob);
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}
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static GCC_NORETURN void
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usage(int ok)
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{
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static const char *msg[] =
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{
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"Usage: view [options] file"
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,""
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,USAGE_COMMON
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,"Options:"
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," -c use color if terminal supports it"
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," -i ignore INT, QUIT, TERM signals"
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#if USE_WIDEC_SUPPORT
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," -n use waddch (bytes) rather then wadd_wch (wide-chars)"
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#endif
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," -s start in single-step mode, waiting for input"
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#ifdef TRACE
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," -t trace screen updates"
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," -T NUM specify trace mask"
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#endif
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};
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size_t n;
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for (n = 0; n < SIZEOF(msg); n++)
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fprintf(stderr, "%s\n", msg[n]);
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ExitProgram(ok ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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/* *INDENT-OFF* */
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VERSION_COMMON()
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/* *INDENT-ON* */
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int
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main(int argc, char *argv[])
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{
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static const char *help[] =
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{
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"Commands:",
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" q,^Q,ESC - quit this program",
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"",
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" p,<Up> - scroll the viewport up by one row",
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" n,<Down> - scroll the viewport down by one row",
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" l,<Left> - scroll the viewport left by one column",
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" r,<Right> - scroll the viewport right by one column",
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" <,> - scroll the viewport left/right by 8 columns",
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"",
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" h,<Home> - scroll the viewport to top of file",
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" ^F,<PageDn> - scroll to the next page",
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" ^B,<PageUp> - scroll to the previous page",
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" e,<End> - scroll the viewport to end of file",
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"",
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" ^L - repaint using redrawwin()",
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"",
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" 0 through 9 - enter digits for count",
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" s - use entered count for halfdelay() parameter",
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" - if no entered count, stop nodelay()",
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" <space> - begin nodelay()",
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0
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};
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int ch;
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int i;
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int my_delay = 0;
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NCURSES_CH_T **olptr;
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int value = 0;
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bool done = FALSE;
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bool got_number = FALSE;
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bool ignore_sigs = FALSE;
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bool single_step = FALSE;
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const char *my_label = "Input";
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setlocale(LC_ALL, "");
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while ((ch = getopt(argc, argv, OPTS_COMMON "cinstT:")) != -1) {
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switch (ch) {
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case 'c':
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try_color = TRUE;
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break;
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case 'i':
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ignore_sigs = TRUE;
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break;
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#if USE_WIDEC_SUPPORT
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case 'n':
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n_option = TRUE;
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break;
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#endif
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case 's':
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single_step = TRUE;
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break;
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#ifdef TRACE
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case 'T':
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{
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char *next = 0;
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int tvalue = (int) strtol(optarg, &next, 0);
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if (tvalue < 0 || (next != 0 && *next != 0))
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usage(FALSE);
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curses_trace((unsigned) tvalue);
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}
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break;
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case 't':
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curses_trace(TRACE_CALLS);
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break;
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#endif
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case OPTS_VERSION:
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show_version(argv);
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ExitProgram(EXIT_SUCCESS);
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default:
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usage(ch == OPTS_USAGE);
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/* NOTREACHED */
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}
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}
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if (optind + 1 != argc)
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usage(FALSE);
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InitAndCatch(initscr(), ignore_sigs ? SIG_IGN : finish);
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keypad(stdscr, TRUE); /* enable keyboard mapping */
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(void) nonl(); /* tell curses not to do NL->CR/NL on output */
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(void) cbreak(); /* take input chars one at a time, no wait for \n */
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(void) noecho(); /* don't echo input */
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if (!single_step)
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nodelay(stdscr, TRUE);
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idlok(stdscr, TRUE); /* allow use of insert/delete line */
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read_file(fname = argv[optind]);
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if (try_color) {
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if (has_colors()) {
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start_color();
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init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
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bkgd((chtype) COLOR_PAIR(my_pair));
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} else {
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try_color = FALSE;
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}
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}
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lptr = vec_lines;
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while (!done) {
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int n, c;
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if (!got_number)
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show_all(my_label);
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for (;;) {
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c = getch();
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if ((c < 127) && isdigit(c)) {
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if (!got_number) {
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MvPrintw(0, 0, "Count: ");
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clrtoeol();
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}
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addch(UChar(c));
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value = 10 * value + (c - '0');
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got_number = TRUE;
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} else
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break;
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}
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if (got_number && value) {
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n = value;
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} else {
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n = 1;
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}
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if (c != ERR)
|
|
my_label = keyname(c);
|
|
switch (c) {
|
|
case KEY_DOWN:
|
|
case 'n':
|
|
olptr = lptr;
|
|
for (i = 0; i < n; i++)
|
|
if ((lptr - vec_lines) < (num_lines - LINES + 1))
|
|
lptr++;
|
|
else
|
|
break;
|
|
scrl((int) (lptr - olptr));
|
|
break;
|
|
|
|
case KEY_UP:
|
|
case 'p':
|
|
olptr = lptr;
|
|
for (i = 0; i < n; i++)
|
|
if (lptr > vec_lines)
|
|
lptr--;
|
|
else
|
|
break;
|
|
scrl((int) (lptr - olptr));
|
|
break;
|
|
|
|
case 'h':
|
|
/* FALLTHRU */
|
|
case KEY_HOME:
|
|
lptr = vec_lines;
|
|
break;
|
|
|
|
case '<':
|
|
if ((shift -= 8) < 0)
|
|
shift = 0;
|
|
break;
|
|
case '>':
|
|
shift += 8;
|
|
break;
|
|
|
|
case 'e':
|
|
/* FALLTHRU */
|
|
case KEY_END:
|
|
if (num_lines > LINES)
|
|
lptr = (vec_lines + num_lines - LINES + 1);
|
|
else
|
|
lptr = (vec_lines + (num_lines - 2));
|
|
break;
|
|
|
|
case CTRL('F'):
|
|
/* FALLTHRU */
|
|
case KEY_NPAGE:
|
|
for (i = 0; i < n; i++) {
|
|
if ((lptr - vec_lines) < (num_lines - 5))
|
|
lptr += (LINES - 1);
|
|
else
|
|
lptr = (vec_lines + num_lines - 2);
|
|
}
|
|
break;
|
|
|
|
case CTRL('B'):
|
|
/* FALLTHRU */
|
|
case KEY_PPAGE:
|
|
for (i = 0; i < n; i++) {
|
|
if ((lptr - vec_lines) >= LINES)
|
|
lptr -= (LINES - 1);
|
|
else
|
|
lptr = vec_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':
|
|
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 */
|
|
}
|