| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini more implementation for busybox |
| * |
| * |
| * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. |
| * |
| * Latest version blended together by Erik Andersen <andersen@lineo.com>, |
| * 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 |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <stdlib.h> |
| #include <sys/ioctl.h> |
| #include "busybox.h" |
| #define BB_DECLARE_EXTERN |
| #define bb_need_help |
| #include "messages.c" |
| |
| /* 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 |
| |
| static FILE *cin; |
| |
| static struct termios initial_settings, new_settings; |
| |
| static void gotsig(int sig) |
| { |
| setTermSettings(fileno(cin), &initial_settings); |
| putchar('\n'); |
| exit(EXIT_FAILURE); |
| } |
| #endif /* BB_FEATURE_USE_TERMIOS */ |
| |
| |
| static int terminal_width = 79; /* not 80 in case terminal has linefold bug */ |
| static int terminal_height = 24; |
| |
| |
| extern int more_main(int argc, char **argv) |
| { |
| int c, lines = 0, input = 0; |
| int please_display_more_prompt = 0; |
| struct stat st; |
| FILE *file; |
| int len, page_height; |
| |
| #if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS |
| struct winsize win = { 0, 0, 0, 0 }; |
| #endif |
| |
| argc--; |
| argv++; |
| |
| do { |
| if (argc == 0) { |
| file = stdin; |
| } else |
| file = xfopen(*argv, "r"); |
| |
| 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); |
| |
| #endif |
| len = 0; |
| page_height = terminal_height; |
| while ((c = getc(file)) != EOF) { |
| |
| if (please_display_more_prompt) { |
| lines = 0; |
| please_display_more_prompt = 0; |
| len = printf("--More-- "); |
| if (file != stdin) { |
| #if _FILE_OFFSET_BITS == 64 |
| len += printf("(%d%% of %lld bytes)", |
| #else |
| len += printf("(%d%% of %ld bytes)", |
| #endif |
| (int) (100 * |
| ((double) ftell(file) / |
| (double) st.st_size)), |
| st.st_size); |
| } |
| len += printf("%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); |
| #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 |
| len=0; |
| page_height = terminal_height; |
| } |
| |
| /* |
| * 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') { |
| 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; |
| } |
| /* Adjust the terminal height for any overlap, so that |
| * no lines get lost off the top. */ |
| if (len) { |
| div_t result = div( len, terminal_width); |
| if (result.quot) { |
| if (result.rem) |
| page_height-=result.quot; |
| else |
| page_height-=(result.quot-1); |
| } |
| } |
| 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); |
| len++; |
| } |
| fclose(file); |
| fflush(stdout); |
| |
| argv++; |
| } while (--argc > 0); |
| end: |
| #ifdef BB_FEATURE_USE_TERMIOS |
| gotsig(0); |
| #endif |
| return(TRUE); |
| } |