| /**************************************************************************** |
| * Copyright 2019,2020 Thomas E. Dickey * |
| * Copyright 1998-2016,2017 Free Software Foundation, Inc. * |
| * * |
| * Permission is hereby granted, free of charge, to any person obtaining a * |
| * copy of this software and associated documentation files (the * |
| * "Software"), to deal in the Software without restriction, including * |
| * without limitation the rights to use, copy, modify, merge, publish, * |
| * distribute, distribute with modifications, sublicense, and/or sell * |
| * copies of the Software, and to permit persons to whom the Software is * |
| * furnished to do so, subject to the following conditions: * |
| * * |
| * The above copyright notice and this permission notice shall be included * |
| * in all copies or substantial portions of the Software. * |
| * * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * |
| * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * |
| * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * |
| * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * |
| * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * |
| * * |
| * Except as contained in this notice, the name(s) of the above copyright * |
| * holders shall not be used in advertising or otherwise to promote the * |
| * sale, use or other dealings in this Software without prior written * |
| * authorization. * |
| ****************************************************************************/ |
| /* |
| * 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. This program intentionally does not use pads, to allow testing |
| * with less-capable implementations of curses. |
| * |
| * 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: view.c,v 1.138 2020/02/02 23:34:34 tom Exp $ |
| */ |
| |
| #include <test.priv.h> |
| #include <widechars.h> |
| #include <popup_msg.h> |
| |
| #include <sys/stat.h> |
| #include <time.h> |
| |
| static void finish(int sig) GCC_NORETURN; |
| |
| #define my_pair 1 |
| |
| static int shift = 0; |
| static bool try_color = FALSE; |
| |
| static char *fname; |
| static NCURSES_CH_T **vec_lines; |
| static NCURSES_CH_T **lptr; |
| static int num_lines; |
| |
| #if USE_WIDEC_SUPPORT |
| static bool n_option = FALSE; |
| #endif |
| |
| static void usage(void) GCC_NORETURN; |
| |
| static void |
| failed(const char *msg) |
| { |
| endwin(); |
| fprintf(stderr, "%s\n", msg); |
| ExitProgram(EXIT_FAILURE); |
| } |
| |
| static int |
| ch_len(NCURSES_CH_T *src) |
| { |
| int result = 0; |
| #if USE_WIDEC_SUPPORT |
| int count; |
| #endif |
| |
| #if USE_WIDEC_SUPPORT |
| for (;;) { |
| TEST_CCHAR(src, count, { |
| int len = wcwidth(test_wch[0]); |
| result += (len > 0) ? len : 1; |
| ++src; |
| } |
| , { |
| break; |
| }) |
| } |
| #else |
| while (*src++) |
| result++; |
| #endif |
| return result; |
| } |
| |
| static void |
| finish(int sig) |
| { |
| endwin(); |
| #if NO_LEAKS |
| if (vec_lines != 0) { |
| int n; |
| for (n = 0; n < num_lines; ++n) { |
| free(vec_lines[n]); |
| } |
| free(vec_lines); |
| } |
| #endif |
| ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
| } |
| |
| static void |
| show_all(const char *tag) |
| { |
| int i; |
| int digits; |
| char temp[BUFSIZ]; |
| NCURSES_CH_T *s; |
| time_t this_time; |
| |
| for (digits = 1, i = num_lines; i > 0; i /= 10) { |
| ++digits; |
| } |
| |
| _nc_SPRINTF(temp, _nc_SLIMIT(sizeof(temp)) |
| "view %.*s", (int) strlen(tag), tag); |
| i = (int) strlen(temp); |
| _nc_SPRINTF(temp + i, _nc_SLIMIT(sizeof(temp) - (size_t) i) |
| " %.*s", (int) sizeof(temp) - i - 2, fname); |
| move(0, 0); |
| printw("%.*s", COLS, temp); |
| clrtoeol(); |
| this_time = time((time_t *) 0); |
| _nc_STRNCPY(temp, ctime(&this_time), (size_t) 30); |
| if ((i = (int) 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++) { |
| int len; |
| int actual = (int) (lptr + i - vec_lines); |
| if (actual > num_lines) { |
| if (i < LINES - 1) { |
| int y, x; |
| getyx(stdscr, y, x); |
| move(i, 0); |
| clrtobot(); |
| move(y, x); |
| } |
| break; |
| } |
| move(i, 0); |
| printw("%*d:", digits, actual); |
| clrtoeol(); |
| if ((s = lptr[i - 1]) == 0) { |
| continue; |
| } |
| len = ch_len(s); |
| if (len > shift) { |
| #if USE_WIDEC_SUPPORT |
| /* |
| * An index into an array of cchar_t's is not necessarily the same |
| * as the column-offset. A pad would do this directly. Here we |
| * must translate (or compute a table of offsets). |
| */ |
| { |
| int j; |
| int width = 1, count; |
| for (j = actual = 0; j < shift; ++j) { |
| TEST_CCHAR(s + j, count, { |
| width = wcwidth(test_wch[0]); |
| } |
| , { |
| width = 1; |
| }); |
| actual += width; |
| if (actual > shift) { |
| break; |
| } else if (actual == shift) { |
| ++j; |
| break; |
| } |
| } |
| if (actual < len) { |
| if (actual > shift) |
| addch('<'); |
| add_wchstr(s + j + (actual > shift)); |
| } |
| } |
| #else |
| addchstr(s + shift); |
| #endif |
| } |
| #if defined(NCURSES_VERSION) || defined(HAVE_WCHGAT) |
| if (try_color) |
| wchgat(stdscr, -1, WA_NORMAL, my_pair, NULL); |
| #endif |
| } |
| setscrreg(1, LINES - 1); |
| scrollok(stdscr, TRUE); |
| refresh(); |
| } |
| |
| static void |
| read_file(const char *filename) |
| { |
| FILE *fp; |
| int pass; |
| int k; |
| int width; |
| size_t j; |
| size_t len; |
| struct stat sb; |
| char *my_blob; |
| char **my_vec = 0; |
| WINDOW *my_win; |
| |
| if (stat(filename, &sb) != 0 |
| || (sb.st_mode & S_IFMT) != S_IFREG) { |
| failed("input is not a file"); |
| } |
| |
| if (sb.st_size == 0) { |
| failed("input is empty"); |
| } |
| |
| if ((fp = fopen(filename, "r")) == 0) { |
| failed("cannot open input-file"); |
| } |
| |
| if ((my_blob = malloc((size_t) sb.st_size + 1)) == 0) { |
| failed("cannot allocate memory for input-file"); |
| } |
| |
| len = fread(my_blob, sizeof(char), (size_t) sb.st_size, fp); |
| my_blob[sb.st_size] = '\0'; |
| fclose(fp); |
| |
| for (pass = 0; pass < 2; ++pass) { |
| char *base = my_blob; |
| k = 0; |
| for (j = 0; j < len; ++j) { |
| if (my_blob[j] == '\n') { |
| if (pass) { |
| my_vec[k] = base; |
| my_blob[j] = '\0'; |
| } |
| base = my_blob + j + 1; |
| ++k; |
| } |
| } |
| num_lines = k; |
| if (base != (my_blob + j)) |
| ++num_lines; |
| if (!pass && |
| ((my_vec = typeCalloc(char *, (size_t) k + 2)) == 0)) { |
| failed("cannot allocate line-vector #1"); |
| } |
| } |
| |
| #if USE_WIDEC_SUPPORT |
| if (!memcmp("\357\273\277", my_blob, 3)) { |
| char *s = my_blob + 3; |
| char *d = my_blob; |
| Trace(("trim BOM")); |
| do { |
| } while ((*d++ = *s++) != '\0'); |
| } |
| #endif |
| |
| width = (int) strlen(my_vec[0]); |
| for (k = 1; my_vec[k]; ++k) { |
| int check = (int) (my_vec[k] - my_vec[k - 1]); |
| if (width < check) |
| width = check; |
| } |
| width = (width + 1) * 5; |
| my_win = newwin(2, width, 0, 0); |
| if (my_win == 0) { |
| failed("cannot allocate temporary window"); |
| } |
| |
| if ((vec_lines = typeCalloc(NCURSES_CH_T *, (size_t) num_lines + 2)) == 0) { |
| failed("cannot allocate line-vector #2"); |
| } |
| |
| /* |
| * Use the curses library for rendering, including tab-conversion. This |
| * will not make the resulting array's indices correspond to column for |
| * lines containing double-width cells because the "in_wch" functions will |
| * ignore the skipped cells. Use pads for that sort of thing. |
| */ |
| Trace(("slurp the file")); |
| for (k = 0; my_vec[k]; ++k) { |
| char *s; |
| int y, x; |
| #if USE_WIDEC_SUPPORT |
| char *last = my_vec[k] + (int) strlen(my_vec[k]); |
| wchar_t wch[2]; |
| size_t rc; |
| #ifndef state_unused |
| mbstate_t state; |
| #endif |
| #endif /* USE_WIDEC_SUPPORT */ |
| |
| werase(my_win); |
| wmove(my_win, 0, 0); |
| #if USE_WIDEC_SUPPORT |
| wch[1] = 0; |
| reset_mbytes(state); |
| #endif |
| for (s = my_vec[k]; *s != '\0'; ++s) { |
| #if USE_WIDEC_SUPPORT |
| if (!n_option) { |
| rc = (size_t) check_mbytes(wch[0], s, (size_t) (last - s), state); |
| if ((long) rc == -1 || (long) rc == -2) { |
| break; |
| } |
| s += rc - 1; |
| waddwstr(my_win, wch); |
| } else |
| #endif |
| waddch(my_win, *s & 0xff); |
| } |
| getyx(my_win, y, x); |
| if (y) |
| x = width - 1; |
| wmove(my_win, 0, 0); |
| /* "x + 1" works with standard curses; some implementations are buggy */ |
| if ((vec_lines[k] = typeCalloc(NCURSES_CH_T, x + width + 1)) == 0) { |
| failed("cannot allocate line-vector #3"); |
| } |
| #if USE_WIDEC_SUPPORT |
| win_wchnstr(my_win, vec_lines[k], x); |
| #else |
| winchnstr(my_win, vec_lines[k], x); |
| #endif |
| } |
| |
| delwin(my_win); |
| free(my_vec); |
| free(my_blob); |
| } |
| |
| 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" |
| #if USE_WIDEC_SUPPORT |
| ," -n use waddch (bytes) rather then wadd_wch (wide-chars)" |
| #endif |
| ," -s start in single-step mode, waiting for input" |
| #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); |
| } |
| |
| int |
| main(int argc, char *argv[]) |
| { |
| static const char *help[] = |
| { |
| "Commands:", |
| " q,^Q,ESC - quit this program", |
| "", |
| " p,<Up> - scroll the viewport up by one row", |
| " n,<Down> - scroll the viewport down by one row", |
| " l,<Left> - scroll the viewport left by one column", |
| " r,<Right> - scroll the viewport right by one column", |
| " <,> - scroll the viewport left/right by 8 columns", |
| "", |
| " h,<Home> - scroll the viewport to top of file", |
| " ^F,<PageDn> - scroll to the next page", |
| " ^B,<PageUp> - scroll to the previous page", |
| " e,<End> - scroll the viewport to end of file", |
| "", |
| " ^L - repaint using redrawwin()", |
| "", |
| " 0 through 9 - enter digits for count", |
| " s - use entered count for halfdelay() parameter", |
| " - if no entered count, stop nodelay()", |
| " <space> - begin nodelay()", |
| 0 |
| }; |
| |
| int i; |
| int my_delay = 0; |
| NCURSES_CH_T **olptr; |
| int value = 0; |
| bool done = FALSE; |
| bool got_number = FALSE; |
| bool ignore_sigs = FALSE; |
| bool single_step = FALSE; |
| const char *my_label = "Input"; |
| |
| setlocale(LC_ALL, ""); |
| |
| while ((i = getopt(argc, argv, "cinstT:")) != -1) { |
| switch (i) { |
| case 'c': |
| try_color = TRUE; |
| break; |
| case 'i': |
| ignore_sigs = TRUE; |
| break; |
| #if USE_WIDEC_SUPPORT |
| case 'n': |
| n_option = TRUE; |
| break; |
| #endif |
| case 's': |
| single_step = TRUE; |
| break; |
| #ifdef TRACE |
| case 'T': |
| { |
| char *next = 0; |
| int tvalue = (int) strtol(optarg, &next, 0); |
| if (tvalue < 0 || (next != 0 && *next != 0)) |
| usage(); |
| curses_trace((unsigned) tvalue); |
| } |
| break; |
| case 't': |
| curses_trace(TRACE_CALLS); |
| break; |
| #endif |
| default: |
| usage(); |
| } |
| } |
| if (optind + 1 != argc) |
| usage(); |
| |
| InitAndCatch(initscr(), ignore_sigs ? SIG_IGN : finish); |
| 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 */ |
| if (!single_step) |
| nodelay(stdscr, TRUE); |
| idlok(stdscr, TRUE); /* allow use of insert/delete line */ |
| |
| read_file(fname = argv[optind]); |
| |
| if (try_color) { |
| if (has_colors()) { |
| start_color(); |
| init_pair(my_pair, COLOR_WHITE, COLOR_BLUE); |
| bkgd((chtype) COLOR_PAIR(my_pair)); |
| } else { |
| try_color = FALSE; |
| } |
| } |
| |
| lptr = vec_lines; |
| while (!done) { |
| int n, c; |
| |
| if (!got_number) |
| show_all(my_label); |
| |
| for (;;) { |
| c = getch(); |
| if ((c < 127) && isdigit(c)) { |
| if (!got_number) { |
| MvPrintw(0, 0, "Count: "); |
| clrtoeol(); |
| } |
| addch(UChar(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 - 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 */ |
| } |