+/* vi: set sw=4 ts=4: */
/*
* Mini more implementation for busybox
*
- * Copyright (C) 1998 by Erik Andersen <andersee@debian.org>
+ * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * Latest version blended together by Erik Andersen <andersen@codepoet.org>,
+ * based on the original more implementation by Bruce, and code from the
+ * Debian boot-floppies team.
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Termios corrects by Vladimir Oleynik <dzo@simtreas.ru>
*
+ * Licensed under GPLv2 or later, see file License in this tarball for details.
*/
-#include "internal.h"
-#include <stdio.h>
-#include <signal.h>
+#include "libbb.h"
+
+/* Support for FEATURE_USE_TERMIOS */
-const char more_usage[] = "[file ...]";
+struct globals {
+ int cin_fileno;
+ struct termios initial_settings;
+ struct termios new_settings;
+} FIX_ALIASING;
+#define G (*(struct globals*)bb_common_bufsiz1)
+#define INIT_G() ((void)0)
+#define initial_settings (G.initial_settings)
+#define new_settings (G.new_settings )
+#define cin_fileno (G.cin_fileno )
-//#define ERASE_STUFF
+#define setTermSettings(fd, argp) do { \
+ if (ENABLE_FEATURE_USE_TERMIOS) tcsetattr(fd, TCSANOW, argp); \
+ } while(0)
+#define getTermSettings(fd, argp) tcgetattr(fd, argp)
-extern int more_main(int argc, char **argv)
+static void gotsig(int sig UNUSED_PARAM)
{
- int c, lines=0;
- int next_page=0, rows = 24;
-#ifdef ERASE_STUFF
- int cols=79;
-#endif
- struct stat st;
- FILE *file = stdin;
-
- if ( strcmp(*argv,"--help")==0 || strcmp(*argv,"-h")==0 ) {
- fprintf(stderr, "Usage: %s %s", *argv, more_usage);
- return(FALSE);
- }
- argc--;
- argv++;
-
- while (argc-- > 0) {
- file = fopen(*argv, "r");
- if (file == NULL) {
- perror("Can't open file");
- return(FALSE);
- }
- fstat(fileno(file), &st);
- fprintf(stderr, "hi\n");
-
- while ((c = getc(file)) != EOF) {
- if ( next_page ) {
- int len=0;
- next_page = 0;
- lines=0;
- len = fprintf(stdout, "--More-- (%d%% of %ld bytes)",
- (int) (100*( (double) ftell(file) / (double) st.st_size )),
- st.st_size);
- fflush(stdout);
- getc( stdin);
-#ifdef ERASE_STUFF
- /* Try to erase the "More" message */
- while(len-- > 0)
- putc('\b', stdout);
- while(len++ < cols)
- putc(' ', stdout);
- while(len-- > 0)
- putc('\b', stdout);
- fflush(stdout);
-#endif
- }
- if ( c == '\n' && ++lines == (rows + 1) )
- next_page = 1;
- putc(c, stdout);
- }
- fclose(file);
- fflush(stdout);
+ bb_putchar('\n');
+ setTermSettings(cin_fileno, &initial_settings);
+ exit(EXIT_FAILURE);
+}
+
+#define CONVERTED_TAB_SIZE 8
+
+int more_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int more_main(int argc UNUSED_PARAM, char **argv)
+{
+ int c = c; /* for gcc */
+ int lines;
+ int input = 0;
+ int spaces = 0;
+ int please_display_more_prompt;
+ struct stat st;
+ FILE *file;
+ FILE *cin;
+ int len;
+ unsigned terminal_width;
+ unsigned terminal_height;
+
+ INIT_G();
- argc--;
argv++;
- }
- return(TRUE);
-}
+ /* Another popular pager, most, detects when stdout
+ * is not a tty and turns into cat. This makes sense. */
+ if (!isatty(STDOUT_FILENO))
+ return bb_cat(argv);
+ cin = fopen_for_read(CURRENT_TTY);
+ if (!cin)
+ return bb_cat(argv);
+ if (ENABLE_FEATURE_USE_TERMIOS) {
+ cin_fileno = fileno(cin);
+ getTermSettings(cin_fileno, &initial_settings);
+ new_settings = initial_settings;
+ new_settings.c_lflag &= ~ICANON;
+ new_settings.c_lflag &= ~ECHO;
+ new_settings.c_cc[VMIN] = 1;
+ new_settings.c_cc[VTIME] = 0;
+ setTermSettings(cin_fileno, &new_settings);
+ bb_signals(0
+ + (1 << SIGINT)
+ + (1 << SIGQUIT)
+ + (1 << SIGTERM)
+ , gotsig);
+ }
+
+ do {
+ file = stdin;
+ if (*argv) {
+ file = fopen_or_warn(*argv, "r");
+ if (!file)
+ continue;
+ }
+ st.st_size = 0;
+ fstat(fileno(file), &st);
+
+ please_display_more_prompt = 0;
+ /* never returns w, h <= 1 */
+ get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
+ terminal_height -= 1;
+
+ len = 0;
+ lines = 0;
+ while (spaces || (c = getc(file)) != EOF) {
+ int wrap;
+ if (spaces)
+ spaces--;
+ loop_top:
+ if (input != 'r' && please_display_more_prompt) {
+ len = printf("--More-- ");
+ if (st.st_size > 0) {
+ len += printf("(%u%% of %"OFF_FMT"u bytes)",
+ (int) (ftello(file)*100 / st.st_size),
+ st.st_size);
+ }
+ fflush_all();
+
+ /*
+ * We've just displayed the "--More--" prompt, so now we need
+ * to get input from the user.
+ */
+ for (;;) {
+ input = getc(cin);
+ input = tolower(input);
+ if (!ENABLE_FEATURE_USE_TERMIOS)
+ printf("\033[A"); /* cursor up */
+ /* Erase the last message */
+ printf("\r%*s\r", len, "");
+ /* Due to various multibyte escape
+ * sequences, it's not ok to accept
+ * any input as a command to scroll
+ * the screen. We only allow known
+ * commands, else we show help msg. */
+ if (input == ' ' || input == '\n' || input == 'q' || input == 'r')
+ break;
+ len = printf("(Enter:next line Space:next page Q:quit R:show the rest)");
+ }
+ len = 0;
+ lines = 0;
+ please_display_more_prompt = 0;
+
+ if (input == 'q')
+ goto end;
+
+ /* The user may have resized the terminal.
+ * Re-read the dimensions. */
+ if (ENABLE_FEATURE_USE_TERMIOS) {
+ get_terminal_width_height(cin_fileno, &terminal_width, &terminal_height);
+ terminal_height -= 1;
+ }
+ }
+
+ /* Crudely convert tabs into spaces, which are
+ * a bajillion times easier to deal with. */
+ if (c == '\t') {
+ spaces = CONVERTED_TAB_SIZE - 1;
+ c = ' ';
+ }
+
+ /*
+ * There are two input streams to worry about here:
+ *
+ * c : the character we are reading from the file being "mored"
+ * input: a character received from the keyboard
+ *
+ * If we hit a newline in the _file_ stream, we want to test and
+ * see if any characters have been hit in the _input_ stream. This
+ * allows the user to quit while in the middle of a file.
+ */
+ wrap = (++len > terminal_width);
+ if (c == '\n' || wrap) {
+ /* Then outputting this character
+ * will move us to a new line. */
+ if (++lines >= terminal_height || input == '\n')
+ please_display_more_prompt = 1;
+ len = 0;
+ }
+ if (c != '\n' && wrap) {
+ /* Then outputting this will also put a character on
+ * the beginning of that new line. Thus we first want to
+ * display the prompt (if any), so we skip the putchar()
+ * and go back to the top of the loop, without reading
+ * a new character. */
+ goto loop_top;
+ }
+ /* My small mind cannot fathom backspaces and UTF-8 */
+ putchar(c);
+ }
+ fclose(file);
+ fflush_all();
+ } while (*argv && *++argv);
+ end:
+ setTermSettings(cin_fileno, &initial_settings);
+ return 0;
+}
projects / oweals / busybox.git / blobdiff