mirror of
https://github.com/sheumann/hush.git
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function old new delta procps_scan 1265 1298 +33 aliascmd 278 283 +5 parse_file_cmd 116 120 +4 dname_enc 373 377 +4 setcmd 90 93 +3 execcmd 57 60 +3 count_lines 72 74 +2 process_command_subs 340 339 -1 test_main 409 407 -2 mknod_main 179 177 -2 handle_incoming_and_exit 2653 2651 -2 argstr 1312 1310 -2 shiftcmd 131 128 -3 exitcmd 46 43 -3 dotcmd 297 294 -3 breakcmd 86 83 -3 evalpipe 353 349 -4 evalcommand 1180 1176 -4 evalcmd 109 105 -4 send_tree 374 369 -5 mkfifo_main 82 77 -5 evalsubshell 152 147 -5 typecmd 75 69 -6 letcmd 61 55 -6 add_cmd 1190 1183 -7 main 891 883 -8 ash_main 1415 1407 -8 parse_stream 1377 1367 -10 alloc_procps_scan 55 - -55 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 7/21 up/down: 54/-148) Total: -94 bytes text data bss dec hex filename 797195 658 7428 805281 c49a1 busybox_old 797101 658 7428 805187 c4943 busybox_unstripped
206 lines
5.3 KiB
C
206 lines
5.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini more implementation for busybox
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*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Latest version blended together by Erik Andersen <andersen@codepoet.org>,
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* based on the original more implementation by Bruce, and code from the
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* Debian boot-floppies team.
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*
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* Termios corrects by Vladimir Oleynik <dzo@simtreas.ru>
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*
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* Licensed under GPLv2 or later, see file License in this tarball for details.
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*/
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#include "libbb.h"
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#if ENABLE_FEATURE_USE_TERMIOS
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#include <termios.h>
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#endif /* FEATURE_USE_TERMIOS */
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#if ENABLE_FEATURE_USE_TERMIOS
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struct globals {
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int cin_fileno;
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struct termios initial_settings;
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struct termios new_settings;
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};
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#define G (*(struct globals*)bb_common_bufsiz1)
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#define INIT_G() ((void)0)
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#define initial_settings (G.initial_settings)
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#define new_settings (G.new_settings )
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#define cin_fileno (G.cin_fileno )
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#define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
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#define getTermSettings(fd, argp) tcgetattr(fd, argp)
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static void gotsig(int sig ATTRIBUTE_UNUSED)
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{
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bb_putchar('\n');
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setTermSettings(cin_fileno, &initial_settings);
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exit(EXIT_FAILURE);
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}
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#else /* !FEATURE_USE_TERMIOS */
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#define INIT_G() ((void)0)
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#define setTermSettings(fd, argp) ((void)0)
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#endif /* FEATURE_USE_TERMIOS */
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#define CONVERTED_TAB_SIZE 8
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int more_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int more_main(int argc ATTRIBUTE_UNUSED, char **argv)
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{
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int c = c; /* for gcc */
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int lines;
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int input = 0;
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int spaces = 0;
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int please_display_more_prompt;
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struct stat st;
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FILE *file;
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FILE *cin;
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int len;
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int terminal_width;
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int terminal_height;
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INIT_G();
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argv++;
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/* Another popular pager, most, detects when stdout
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* is not a tty and turns into cat. This makes sense. */
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if (!isatty(STDOUT_FILENO))
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return bb_cat(argv);
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cin = fopen(CURRENT_TTY, "r");
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if (!cin)
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return bb_cat(argv);
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#if ENABLE_FEATURE_USE_TERMIOS
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cin_fileno = fileno(cin);
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getTermSettings(cin_fileno, &initial_settings);
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new_settings = initial_settings;
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new_settings.c_lflag &= ~ICANON;
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new_settings.c_lflag &= ~ECHO;
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new_settings.c_cc[VMIN] = 1;
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new_settings.c_cc[VTIME] = 0;
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setTermSettings(cin_fileno, &new_settings);
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bb_signals(0
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+ (1 << SIGINT)
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+ (1 << SIGQUIT)
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+ (1 << SIGTERM)
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, gotsig);
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#endif
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do {
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file = stdin;
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if (*argv) {
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file = fopen_or_warn(*argv, "r");
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if (!file)
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continue;
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}
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st.st_size = 0;
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fstat(fileno(file), &st);
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please_display_more_prompt = 0;
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/* never returns w, h <= 1 */
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get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
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terminal_height -= 1;
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len = 0;
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lines = 0;
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while (spaces || (c = getc(file)) != EOF) {
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int wrap;
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if (spaces)
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spaces--;
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loop_top:
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if (input != 'r' && please_display_more_prompt) {
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len = printf("--More-- ");
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if (st.st_size > 0) {
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len += printf("(%d%% of %"OFF_FMT"d bytes)",
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(int) (ftello(file)*100 / st.st_size),
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st.st_size);
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}
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fflush(stdout);
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/*
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* We've just displayed the "--More--" prompt, so now we need
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* to get input from the user.
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*/
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for (;;) {
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input = getc(cin);
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input = tolower(input);
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#if !ENABLE_FEATURE_USE_TERMIOS
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printf("\033[A"); /* up cursor */
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#endif
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/* Erase the last message */
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printf("\r%*s\r", len, "");
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/* Due to various multibyte escape
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* sequences, it's not ok to accept
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* any input as a command to scroll
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* the screen. We only allow known
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* commands, else we show help msg. */
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if (input == ' ' || input == '\n' || input == 'q' || input == 'r')
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break;
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len = printf("(Enter:next line Space:next page Q:quit R:show the rest)");
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}
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len = 0;
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lines = 0;
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please_display_more_prompt = 0;
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if (input == 'q')
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goto end;
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/* The user may have resized the terminal.
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* Re-read the dimensions. */
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#if ENABLE_FEATURE_USE_TERMIOS
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get_terminal_width_height(cin_fileno, &terminal_width, &terminal_height);
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terminal_height -= 1;
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#endif
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}
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/* Crudely convert tabs into spaces, which are
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* a bajillion times easier to deal with. */
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if (c == '\t') {
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spaces = CONVERTED_TAB_SIZE - 1;
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c = ' ';
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}
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/*
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* There are two input streams to worry about here:
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*
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* c : the character we are reading from the file being "mored"
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* input: a character received from the keyboard
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*
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* If we hit a newline in the _file_ stream, we want to test and
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* see if any characters have been hit in the _input_ stream. This
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* allows the user to quit while in the middle of a file.
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*/
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wrap = (++len > terminal_width);
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if (c == '\n' || wrap) {
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/* Then outputting this character
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* will move us to a new line. */
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if (++lines >= terminal_height || input == '\n')
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please_display_more_prompt = 1;
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len = 0;
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}
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if (c != '\n' && wrap) {
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/* Then outputting this will also put a character on
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* the beginning of that new line. Thus we first want to
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* display the prompt (if any), so we skip the putchar()
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* and go back to the top of the loop, without reading
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* a new character. */
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goto loop_top;
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}
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/* My small mind cannot fathom backspaces and UTF-8 */
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putchar(c);
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}
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fclose(file);
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fflush(stdout);
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} while (*argv && *++argv);
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end:
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setTermSettings(cin_fileno, &initial_settings);
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return 0;
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}
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