+/* 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.
*/
-
-/* Turning this off makes things a bit smaller (and less pretty) */
-#define BB_MORE_TERM
-
+#include "busybox.h"
-#include "internal.h"
-#include <stdio.h>
-#include <signal.h>
+#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);
+static struct termios initial_settings, new_settings;
-const char more_usage[] = "[file ...]";
-
-
-#ifdef BB_MORE_TERM
- #include <termios.h>
- #include <signal.h>
- #include <sys/ioctl.h>
+static void set_tty_to_initial_mode(void)
+{
+ setTermSettings(cin_fileno, &initial_settings);
+}
- FILE *cin;
- struct termios initial_settings, new_settings;
+static void gotsig(int sig)
+{
+ putchar('\n');
+ exit(EXIT_FAILURE);
+}
+#endif /* FEATURE_USE_TERMIOS */
- void gotsig(int sig) {
- tcsetattr(fileno(cin), TCSANOW, &initial_settings);
- exit( TRUE);
- }
-#endif
-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 next_page=0, rows = 24;
-#ifdef BB_MORE_TERM
- int cols=79;
- struct winsize win;
-#endif
- struct stat st;
- FILE *file = stdin;
-
- if ( strcmp(*argv,"--help")==0 || strcmp(*argv,"-h")==0 ) {
- usage (more_usage);
- }
- argc--;
- argv++;
-
- while (argc-- > 0) {
- file = fopen(*argv, "r");
- if (file == NULL) {
- perror("Can't open file");
- exit(FALSE);
- }
- fstat(fileno(file), &st);
- fprintf(stderr, "hi\n");
-
-#ifdef BB_MORE_TERM
- cin = fopen("/dev/tty", "r");
- tcgetattr(fileno(cin),&initial_settings);
+ 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;
+
+ 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;
- tcsetattr(fileno(cin), TCSANOW, &new_settings);
-
- (void) signal(SIGINT, gotsig);
-
- ioctl(STDOUT_FILENO, TIOCGWINSZ, &win);
- if (win.ws_row > 4) rows = win.ws_row - 2;
- if (win.ws_col > 0) cols = win.ws_col - 1;
-
-
+ 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
- while ((c = getc(file)) != EOF) {
- if ( next_page ) {
- int len=0;
- next_page = 0;
- lines=0;
- len = fprintf(stdout, "--More-- (%d%% of %ld bytes)%s",
- (int) (100*( (double) ftell(file) / (double) st.st_size )),
- st.st_size,
-#ifdef BB_MORE_TERM
- ""
-#else
- "\n"
+ please_display_more_prompt = 2;
+
+ 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 &= ~1;
+ /* never returns w, h <= 1 */
+ get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
+ terminal_width -= 1;
+ terminal_height -= 1;
+
+ len = 0;
+ lines = 0;
+ page_height = terminal_height;
+ while ((c = getc(file)) != EOF) {
+
+ 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);
+ }
+ fflush(stdout);
+
+ /*
+ * We've just displayed the "--More--" prompt, so now we need
+ * to get input from the user.
+ */
+ input = getc(cin);
+#if !ENABLE_FEATURE_USE_TERMIOS
+ printf("\033[A"); /* up cursor */
#endif
- );
-
+ /* Erase the "More" message */
+ 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"
+ * 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.
+ */
+ if (c == '\n') {
+ /* 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 >= page_height) {
+ please_display_more_prompt |= 1;
+ }
+ len = 0;
+ }
+ /*
+ * 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);
- input = getc( stdin);
-
-#ifdef BB_MORE_TERM
- /* 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 (input=='q')
- goto end;
- if (input==' ' && c == '\n' )
- next_page = 1;
- if ( c == '\n' && ++lines == (rows + 1) )
- next_page = 1;
- putc(c, stdout);
- }
- fclose(file);
- fflush(stdout);
-
- argc--;
- argv++;
- }
-end:
-#ifdef BB_MORE_TERM
- gotsig(0);
-#endif
- exit(TRUE);
+ } while (*argv && *++argv);
+ end:
+ return 0;
}
-
projects / oweals / busybox.git / blobdiff