+/* 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 source tree.
*/
+//config:config MORE
+//config: bool "more (6.7 kb)"
+//config: default y
+//config: help
+//config: more is a simple utility which allows you to read text one screen
+//config: sized page at a time. If you want to read text that is larger than
+//config: the screen, and you are using anything faster than a 300 baud modem,
+//config: you will probably find this utility very helpful. If you don't have
+//config: any need to reading text files, you can leave this disabled.
+
+//applet:IF_MORE(APPLET(more, BB_DIR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_MORE) += more.o
+
+//usage:#define more_trivial_usage
+//usage: "[FILE]..."
+//usage:#define more_full_usage "\n\n"
+//usage: "View FILE (or stdin) one screenful at a time"
+//usage:
+//usage:#define more_example_usage
+//usage: "$ dmesg | more\n"
+
+#include "libbb.h"
+#include "common_bufsiz.h"
+
+struct globals {
+ int tty_fileno;
+ unsigned terminal_width;
+ unsigned terminal_height;
+ struct termios initial_settings;
+} FIX_ALIASING;
+#define G (*(struct globals*)bb_common_bufsiz1)
+#define INIT_G() do { setup_common_bufsiz(); } while (0)
+
+static void get_wh(void)
+{
+ /* never returns w, h <= 1 */
+ get_terminal_width_height(G.tty_fileno, &G.terminal_width, &G.terminal_height);
+ G.terminal_height -= 1;
+}
+static void tcsetattr_tty_TCSANOW(struct termios *settings)
+{
+ tcsetattr(G.tty_fileno, TCSANOW, settings);
+}
-/* Turning this off makes things a bit smaller (and less pretty) */
-#define BB_MORE_TERM
-
-
-
-#include "internal.h"
-#include <stdio.h>
-#include <fcntl.h>
-#include <signal.h>
-
-
-static const char more_usage[] = "[file ...]";
-
-
-/* ED: sparc termios is broken: revert back to old termio handling. */
-#ifdef BB_MORE_TERM
-
-
-#if defined (__sparc__)
-# define USE_OLD_TERMIO
-# include <termio.h>
-# include <sys/ioctl.h>
-# define termios termio
-# define stty(fd,argp) ioctl(fd,TCSETAF,argp)
-#else
-# include <termios.h>
-# define stty(fd,argp) tcsetattr(fd,TCSANOW,argp)
-#endif
-
- FILE *cin;
- struct termios initial_settings, new_settings;
+static void gotsig(int sig UNUSED_PARAM)
+{
+ /* bb_putchar_stderr doesn't use stdio buffering,
+ * therefore it is safe in signal handler */
+ bb_putchar_stderr('\n');
+ tcsetattr_tty_TCSANOW(&G.initial_settings);
+ _exit(EXIT_FAILURE);
+}
- void gotsig(int sig) {
- stty(fileno(cin), &initial_settings);
- exit( TRUE);
- }
-#endif
+#define CONVERTED_TAB_SIZE 8
-extern int more_main(int argc, char **argv)
+int more_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int more_main(int argc UNUSED_PARAM, char **argv)
{
- int c, lines=0, input=0;
- int next_page=0;
- struct stat st;
- FILE *file;
-
- if ( strcmp(*argv,"--help")==0 || strcmp(*argv,"-h")==0 ) {
- usage (more_usage);
- }
- argc--;
- argv++;
-
- while (argc >= 0) {
- if (argc==0) {
- file = stdin;
- }
- else
- file = fopen(*argv, "r");
-
- if (file == NULL) {
- perror(*argv);
- exit(FALSE);
- }
- fstat(fileno(file), &st);
-
-#ifdef BB_MORE_TERM
- cin = fopen("/dev/tty", "r");
- if (!cin)
- cin = fopen("/dev/console", "r");
-#ifdef USE_OLD_TERMIO
- ioctl(fileno(cin),TCGETA,&initial_settings);
-#else
- tcgetattr(fileno(cin),&initial_settings);
-#endif
- new_settings = initial_settings;
- new_settings.c_lflag &= ~ICANON;
- new_settings.c_lflag &= ~ECHO;
- stty(fileno(cin), &new_settings);
-
- (void) signal(SIGINT, gotsig);
-
-#endif
- while ((c = getc(file)) != EOF) {
- if ( next_page ) {
- int len=0;
- next_page = 0;
- lines=0;
- len = fprintf(stdout, "--More-- ");
- if (file != stdin) {
- len += fprintf(stdout, "(%d%% of %ld bytes)",
- (int) (100*( (double) ftell(file) / (double) st.st_size )),
- st.st_size);
+ int c = c; /* for compiler */
+ int input = 0;
+ int spaces = 0;
+ int please_display_more_prompt;
+ FILE *tty;
+
+ INIT_G();
+
+ /* Parse options */
+ /* Accepted but ignored: */
+ /* -d Display help instead of ringing bell */
+ /* -f Count logical lines (IOW: long lines are not folded) */
+ /* -l Do not pause after any line containing a ^L (form feed) */
+ /* -s Squeeze blank lines into one */
+ /* -u Suppress underlining */
+ getopt32(argv, "dflsu");
+ argv += optind;
+
+ /* 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);
+ tty = fopen_for_read(CURRENT_TTY);
+ if (!tty)
+ return bb_cat(argv);
+
+ G.tty_fileno = fileno(tty);
+
+ /* Turn on unbuffered input; turn off echoing */
+ set_termios_to_raw(G.tty_fileno, &G.initial_settings, 0);
+ bb_signals(BB_FATAL_SIGS, gotsig);
+
+ do {
+ struct stat st;
+ FILE *file;
+ int len;
+ int lines;
+
+ file = stdin;
+ if (*argv) {
+ file = fopen_or_warn(*argv, "r");
+ if (!file)
+ continue;
}
- len += fprintf(stdout, "%s",
-#ifdef BB_MORE_TERM
- ""
-#else
- "\n"
-#endif
- );
-
- fflush(stdout);
- input = getc( cin);
-
-#ifdef BB_MORE_TERM
- /* Erase the "More" message */
- while(len-- > 0)
- putc('\b', stdout);
- while(len++ < 79)
- putc(' ', stdout);
- while(len-- > 0)
- putc('\b', stdout);
- fflush(stdout);
-#endif
-
- }
- if (input=='q')
- goto end;
- if (input==' ' && c == '\n' )
- next_page = 1;
- if ( c == '\n' && ++lines == 24 )
- next_page = 1;
- putc(c, stdout);
- }
- fclose(file);
- fflush(stdout);
-
- argc--;
- argv++;
- }
-end:
-#ifdef BB_MORE_TERM
- gotsig(0);
-#endif
- exit(TRUE);
+ st.st_size = 0;
+ fstat(fileno(file), &st);
+
+ get_wh();
+
+ please_display_more_prompt = 0;
+ len = 0;
+ lines = 0;
+ for (;;) {
+ int wrap;
+
+ if (spaces)
+ spaces--;
+ else {
+ c = getc(file);
+ if (c == EOF) break;
+ }
+ loop_top:
+ if (input != 'r' && please_display_more_prompt) {
+ len = printf("--More-- ");
+ if (st.st_size != 0) {
+ uoff_t d = (uoff_t)st.st_size / 100;
+ if (d == 0)
+ d = 1;
+ len += printf("(%u%% of %"OFF_FMT"u bytes)",
+ (int) ((uoff_t)ftello(file) / d),
+ st.st_size);
+ }
+
+ /*
+ * We've just displayed the "--More--" prompt, so now we need
+ * to get input from the user.
+ */
+ for (;;) {
+ fflush_all();
+ input = getc(tty);
+ input = tolower(input);
+ /* Erase the last message */
+ printf("\r%*s\r", len, "");
+
+ if (input == 'q')
+ goto end;
+ /* 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 == '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;
+
+ /* The user may have resized the terminal.
+ * Re-read the dimensions. */
+ get_wh();
+ }
+
+ /* Crudely convert tabs into spaces, which are
+ * a bajillion times easier to deal with. */
+ if (c == '\t') {
+ spaces = ((unsigned)~len) % CONVERTED_TAB_SIZE;
+ 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 > G.terminal_width);
+ if (c == '\n' || wrap) {
+ /* Then outputting this character
+ * will move us to a new line. */
+ if (++lines >= G.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);
+ die_if_ferror_stdout(); /* if tty was destroyed (closed xterm, etc) */
+ }
+ fclose(file);
+ fflush_all();
+ } while (*argv && *++argv);
+ end:
+ tcsetattr_tty_TCSANOW(&G.initial_settings);
+ return 0;
}
-
projects / oweals / busybox.git / blobdiff