diff options
Diffstat (limited to 'release/src/router/busybox/more.c')
| -rw-r--r-- | release/src/router/busybox/more.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/release/src/router/busybox/more.c b/release/src/router/busybox/more.c new file mode 100644 index 00000000..780cddf6 --- /dev/null +++ b/release/src/router/busybox/more.c @@ -0,0 +1,217 @@ +/* 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. + * + * Termios corrects by Vladimir Oleynik <vodz@usa.net> + * + * 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 <unistd.h> +#include <sys/ioctl.h> +#include "busybox.h" + +static FILE *cin; + +#ifdef BB_FEATURE_USE_TERMIOS +#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; + +static void set_tty_to_initial_mode(void) +{ + setTermSettings(fileno(cin), &initial_settings); +} + +static void gotsig(int sig) +{ + 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, input = 0; + int please_display_more_prompt = -1; + 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++; + + + /* not use inputing from terminal if usage: more > outfile */ + if(isatty(fileno(stdout))) { + cin = fopen(CURRENT_TTY, "r"); + if (!cin) + cin = xfopen(CONSOLE_DEV, "r"); + please_display_more_prompt = 0; +#ifdef BB_FEATURE_USE_TERMIOS + getTermSettings(fileno(cin), &initial_settings); + new_settings = initial_settings; + new_settings.c_lflag &= ~ICANON; + new_settings.c_lflag &= ~ECHO; +#ifndef linux + /* Hmm, in linux c_cc[] not parsed if set ~ICANON */ + new_settings.c_cc[VMIN] = 1; + new_settings.c_cc[VTIME] = 0; +#endif + setTermSettings(fileno(cin), &new_settings); + atexit(set_tty_to_initial_mode); + (void) signal(SIGINT, gotsig); + (void) signal(SIGQUIT, gotsig); + (void) signal(SIGTERM, gotsig); +#endif + } + + do { + if (argc == 0) { + file = stdin; + } else + file = wfopen(*argv, "r"); + if(file==0) + goto loop; + + fstat(fileno(file), &st); + + if(please_display_more_prompt>0) + please_display_more_prompt = 0; + +#if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS + 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 + len=0; + lines = 0; + page_height = terminal_height; + while ((c = getc(file)) != EOF) { + + if (please_display_more_prompt>0) { + len = printf("--More-- "); + if (file != stdin) { +#if _FILE_OFFSET_BITS == 64 + len += printf("(%d%% of %lld bytes)", + (int) (100 * ((double) ftell(file) / + (double) st.st_size)), (long long)st.st_size); +#else + len += printf("(%d%% of %ld bytes)", + (int) (100 * ((double) ftell(file) / + (double) st.st_size)), (long)st.st_size); +#endif + } + + fflush(stdout); + + /* + * We've just displayed the "--More--" prompt, so now we need + * to get input from the user. + */ + input = getc(cin); +#ifndef BB_FEATURE_USE_TERMIOS + printf("\033[A"); /* up cursor */ +#endif + /* Erase the "More" message */ + putc('\r', stdout); + while (--len >= 0) + putc(' ', stdout); + putc('\r', stdout); + fflush(stdout); + len=0; + lines = 0; + page_height = terminal_height; + please_display_more_prompt = 0; + + 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') + if(please_display_more_prompt==0) + 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); + if (quot) { + if (rem) + page_height-=quot; + else + page_height-=(quot-1); + } + } + if (++lines >= page_height) { + if(please_display_more_prompt==0) + 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); +loop: + argv++; + } while (--argc > 0); + end: + return 0; +} |