X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;ds=inline;f=util-linux%2Fmore.c;h=35957139711f20b89b3c5b793b66f5ccc9a1af0f;hb=70f4320b40b7af83525cebabab2bc437a22c41d2;hp=c4c74fe4adb176b5c0564dc683b2be62776b2979;hpb=ed3ef50c233ffb1b50ea0e7382a8e60b86491009;p=oweals%2Fbusybox.git diff --git a/util-linux/more.c b/util-linux/more.c index c4c74fe4a..359571397 100644 --- a/util-linux/more.c +++ b/util-linux/more.c @@ -2,204 +2,211 @@ /* * Mini more implementation for busybox * - * * Copyright (C) 1995, 1996 by Bruce Perens . + * Copyright (C) 1999-2004 by Erik Andersen * - * Latest version blended together by Erik Andersen , - * based on the original more implementation by Bruce, and code from the + * Latest version blended together by Erik Andersen , + * 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 * + * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ -#include "busybox.h" -#include -#include -#include -#include -#include -#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 -# define termios termio -# define setTermSettings(fd,argp) ioctl(fd,TCSETAF,argp) -# define getTermSettings(fd,argp) ioctl(fd,TCGETA,argp) -# else -# include -# 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) +//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" + +/* Support for FEATURE_USE_TERMIOS */ + +struct globals { + int cin_fileno; + struct termios initial_settings; + struct termios new_settings; +} FIX_ALIASING; +#define G (*(struct globals*)bb_common_bufsiz1) +#define INIT_G() ((void)0) +#define initial_settings (G.initial_settings) +#define new_settings (G.new_settings ) +#define cin_fileno (G.cin_fileno ) + +#define setTermSettings(fd, argp) \ +do { \ + if (ENABLE_FEATURE_USE_TERMIOS) \ + tcsetattr(fd, TCSANOW, argp); \ +} while (0) +#define getTermSettings(fd, argp) tcgetattr(fd, argp) + +static void gotsig(int sig UNUSED_PARAM) { - setTermSettings(fileno(cin), &initial_settings); - putchar('\n'); - exit(EXIT_FAILURE); + /* bb_putchar_stderr doesn't use stdio buffering, + * therefore it is safe in signal handler */ + bb_putchar_stderr('\n'); + setTermSettings(cin_fileno, &initial_settings); + _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; +#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 please_display_more_prompt = 0; + int c = c; /* for compiler */ + int lines; + int input = 0; + int spaces = 0; + int please_display_more_prompt; struct stat st; FILE *file; + FILE *cin; + int len; + unsigned terminal_width; + unsigned terminal_height; -#if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS - struct winsize win = { 0, 0, 0, 0 }; -#endif + INIT_G(); - 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); + /* 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_for_read(CURRENT_TTY); + 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 | ECHO); 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 - while ((c = getc(file)) != EOF) { - if (please_display_more_prompt) { - int len = 0; + setTermSettings(cin_fileno, &new_settings); + bb_signals(0 + + (1 << SIGINT) + + (1 << SIGQUIT) + + (1 << SIGTERM) + , gotsig); + } - please_display_more_prompt = 0; - lines = 0; + 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 = 0; + /* never returns w, h <= 1 */ + get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height); + terminal_height -= 1; + + len = 0; + lines = 0; + while (spaces || (c = getc(file)) != EOF) { + int wrap; + if (spaces) + spaces--; + loop_top: + if (input != 'r' && please_display_more_prompt) { 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); + 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); } - len += printf("%s", -#ifdef BB_FEATURE_USE_TERMIOS - "" -#else - "\n" -#endif - ); - - fflush(stdout); + fflush_all(); /* * 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 + for (;;) { + input = getc(cin); + input = tolower(input); + if (!ENABLE_FEATURE_USE_TERMIOS) + printf("\033[A"); /* cursor up */ + /* Erase the last message */ + printf("\r%*s\r", len, ""); + + /* 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 == 'q' || 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; + + if (input == 'q') + goto end; + + /* The user may have resized the terminal. + * Re-read the dimensions. */ + if (ENABLE_FEATURE_USE_TERMIOS) { + get_terminal_width_height(cin_fileno, &terminal_width, &terminal_height); + terminal_height -= 1; + } + } + /* 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 + * 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; - } - if (++lines == terminal_height) + wrap = (++len > terminal_width); + if (c == '\n' || wrap) { + /* Then outputting this character + * will move us to a new line. */ + if (++lines >= terminal_height || input == '\n') 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); + 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(stdout); - - argv++; - } while (--argc > 0); - end: -#ifdef BB_FEATURE_USE_TERMIOS - gotsig(0); -#endif - return(TRUE); + fflush_all(); + } while (*argv && *++argv); + end: + setTermSettings(cin_fileno, &initial_settings); + return 0; }