/*
* Mini more implementation for busybox
*
- *
* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
- * Latest version blended together by Erik Andersen <andersen@lineo.com>,
- * based on the original more implementation by Bruce, and code from the
+ * 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 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.
- *
- * 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 <fcntl.h>
-#include <signal.h>
-#include <sys/ioctl.h>
-#define BB_DECLARE_EXTERN
-#define bb_need_help
-#include "messages.c"
-
-static const char more_usage[] = "more [FILE ...]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nMore is a filter for viewing FILE one screenful at a time.\n"
-#endif
- ;
-
-/* ED: sparc termios is broken: revert back to old termio handling. */
-#ifdef BB_FEATURE_USE_TERMIOS
-
-#if #cpu(sparc)
-# include <termio.h>
-# define termios termio
-# define setTermSettings(fd,argp) ioctl(fd,TCSETAF,argp)
-# define getTermSettings(fd,argp) ioctl(fd,TCGETA,argp)
-#else
-# include <termios.h>
-# define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
-# define getTermSettings(fd,argp) tcgetattr(fd, argp);
-#endif
+#include "busybox.h"
-FILE *cin;
-struct termios initial_settings, new_settings;
+#if ENABLE_FEATURE_USE_TERMIOS
+static int cin_fileno;
+#include <termios.h>
+#define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
+#define getTermSettings(fd, argp) tcgetattr(fd, argp);
-void gotsig(int sig)
+static struct termios initial_settings, new_settings;
+
+static void set_tty_to_initial_mode(void)
{
- setTermSettings(fileno(cin), &initial_settings);
- fprintf(stdout, "\n");
- exit(TRUE);
+ setTermSettings(cin_fileno, &initial_settings);
}
-#endif
-
-
-
-#define TERMINAL_WIDTH 79 /* not 80 in case terminal has linefold bug */
-#define TERMINAL_HEIGHT 24
-
-
-#if defined BB_FEATURE_AUTOWIDTH
-#ifdef BB_FEATURE_USE_TERMIOS
-static int terminal_width = TERMINAL_WIDTH;
-#endif
-static int terminal_height = TERMINAL_HEIGHT;
-#else
-#define terminal_width TERMINAL_WIDTH
-#define terminal_height TERMINAL_HEIGHT
-#endif
+static void gotsig(int sig)
+{
+ putchar('\n');
+ exit(EXIT_FAILURE);
+}
+#endif /* FEATURE_USE_TERMIOS */
-extern int more_main(int argc, char **argv)
+int more_main(int argc, char **argv);
+int more_main(int argc, char **argv)
{
- int c, lines = 0, input = 0;
+ int c, lines, input = 0;
int please_display_more_prompt = 0;
struct stat st;
FILE *file;
+ FILE *cin;
+ int len, page_height;
+ int terminal_width;
+ int terminal_height;
-#if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
- struct winsize win = { 0, 0 };
-#endif
-
- argc--;
argv++;
+ /* 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(CURRENT_TTY, "r");
+ 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);
+ atexit(set_tty_to_initial_mode);
+ signal(SIGINT, gotsig);
+ signal(SIGQUIT, gotsig);
+ signal(SIGTERM, gotsig);
+#endif
+ please_display_more_prompt = 2;
- if (argc > 0
- && (strcmp(*argv, dash_dash_help) == 0 || strcmp(*argv, "-h") == 0)) {
- usage(more_usage);
- }
do {
- if (argc == 0) {
- file = stdin;
- } else
- file = fopen(*argv, "r");
-
- if (file == NULL) {
- perror(*argv);
- exit(FALSE);
+ file = stdin;
+ if (*argv) {
+ file = fopen_or_warn(*argv, "r");
+ if (!file)
+ continue;
}
+ st.st_size = 0;
fstat(fileno(file), &st);
-#ifdef BB_FEATURE_USE_TERMIOS
- cin = fopen("/dev/tty", "r");
- if (!cin)
- cin = fopen("/dev/console", "r");
- getTermSettings(fileno(cin), &initial_settings);
- new_settings = initial_settings;
- new_settings.c_cc[VMIN] = 1;
- new_settings.c_cc[VTIME] = 0;
- new_settings.c_lflag &= ~ICANON;
- new_settings.c_lflag &= ~ECHO;
- setTermSettings(fileno(cin), &new_settings);
-
-#ifdef BB_FEATURE_AUTOWIDTH
- ioctl(fileno(stdout), TIOCGWINSZ, &win);
- if (win.ws_row > 4)
- terminal_height = win.ws_row - 2;
- if (win.ws_col > 0)
- terminal_width = win.ws_col - 1;
-#endif
-
- (void) signal(SIGINT, gotsig);
- (void) signal(SIGQUIT, gotsig);
- (void) signal(SIGTERM, gotsig);
+ please_display_more_prompt &= ~1;
+ /* never returns w, h <= 1 */
+ get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
+ terminal_width -= 1;
+ terminal_height -= 1;
-#endif
+ len = 0;
+ lines = 0;
+ page_height = terminal_height;
while ((c = getc(file)) != EOF) {
- if (please_display_more_prompt) {
- int len = 0;
- please_display_more_prompt = 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);
+ if ((please_display_more_prompt & 3) == 3) {
+ len = printf("--More-- ");
+ if (/*file != stdin &&*/ st.st_size > 0) {
+ len += printf("(%d%% of %"OFF_FMT"d bytes)",
+ (int) (ftello(file)*100 / st.st_size),
+ st.st_size);
}
- len += fprintf(stdout, "%s",
-#ifdef BB_FEATURE_USE_TERMIOS
- ""
-#else
- "\n"
-#endif
- );
-
fflush(stdout);
/*
* We've just displayed the "--More--" prompt, so now we need
* to get input from the user.
*/
-#ifdef BB_FEATURE_USE_TERMIOS
input = getc(cin);
-#else
- input = getc(stdin);
+#if !ENABLE_FEATURE_USE_TERMIOS
+ printf("\033[A"); /* up cursor */
#endif
-
-#ifdef BB_FEATURE_USE_TERMIOS
/* Erase the "More" message */
- while (--len >= 0)
- putc('\b', stdout);
- while (++len <= terminal_width)
- putc(' ', stdout);
- while (--len >= 0)
- putc('\b', stdout);
- fflush(stdout);
-#endif
+ printf("\r%*s\r", len, "");
+ len = 0;
+ lines = 0;
+ /* Bottom line on page will become top line
+ * after one page forward. Thus -1: */
+ page_height = terminal_height - 1;
+ please_display_more_prompt &= ~1;
+ if (input == 'q')
+ goto end;
}
- /*
+ /*
* There are two input streams to worry about here:
*
- * c : the character we are reading from the file being "mored"
+ * 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
* allows the user to quit while in the middle of a file.
*/
if (c == '\n') {
- switch (input) {
- case 'q':
- goto end;
- case '\n':
- /* increment by just one line if we are at
- * the end of this line*/
- please_display_more_prompt = 1;
- break;
+ /* increment by just one line if we are at
+ * the end of this line */
+ if (input == '\n')
+ please_display_more_prompt |= 1;
+ /* Adjust the terminal height for any overlap, so that
+ * no lines get lost off the top. */
+ if (len >= terminal_width) {
+ int quot, rem;
+ quot = len / terminal_width;
+ rem = len - (quot * terminal_width);
+ page_height -= (quot - 1);
+ if (rem)
+ page_height--;
}
- if (++lines == terminal_height)
- please_display_more_prompt = 1;
+ if (++lines >= page_height) {
+ please_display_more_prompt |= 1;
+ }
+ len = 0;
}
- /* If any key other than a return is hit, scroll by one page */
+ /*
+ * If we just read a newline from the file being 'mored' and any
+ * key other than a return is hit, scroll by one page
+ */
putc(c, stdout);
+ /* My small mind cannot fathom tabs, backspaces,
+ * and UTF-8 */
+ len++;
}
fclose(file);
fflush(stdout);
-
- argv++;
- } while (--argc > 0);
- end:
-#ifdef BB_FEATURE_USE_TERMIOS
- gotsig(0);
-#endif
- exit(TRUE);
+ } while (*argv && *++argv);
+ end:
+ return 0;
}
projects / oweals / busybox.git / blobdiff