mirror of
https://github.com/sheumann/hush.git
synced 2024-08-17 00:29:03 +00:00
206 lines
5.4 KiB
C
206 lines
5.4 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini more implementation for busybox
|
|
*
|
|
* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
|
|
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
|
*
|
|
* 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.
|
|
*
|
|
* Termios corrects by Vladimir Oleynik <dzo@simtreas.ru>
|
|
*
|
|
* Licensed under GPLv2 or later, see file License in this tarball for details.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
#if ENABLE_FEATURE_USE_TERMIOS
|
|
#include <termios.h>
|
|
#endif /* FEATURE_USE_TERMIOS */
|
|
|
|
|
|
#if ENABLE_FEATURE_USE_TERMIOS
|
|
|
|
struct globals {
|
|
int cin_fileno;
|
|
struct termios initial_settings;
|
|
struct termios new_settings;
|
|
};
|
|
#define G (*(struct globals*)bb_common_bufsiz1)
|
|
//#define G (*ptr_to_globals)
|
|
#define INIT_G() ((void)0)
|
|
//#define INIT_G() PTR_TO_GLOBALS = xzalloc(sizeof(G))
|
|
#define initial_settings (G.initial_settings)
|
|
#define new_settings (G.new_settings )
|
|
#define cin_fileno (G.cin_fileno )
|
|
|
|
#define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
|
|
#define getTermSettings(fd, argp) tcgetattr(fd, argp)
|
|
|
|
static void gotsig(int sig)
|
|
{
|
|
bb_putchar('\n');
|
|
setTermSettings(cin_fileno, &initial_settings);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
#else /* !FEATURE_USE_TERMIOS */
|
|
#define INIT_G() ((void)0)
|
|
#define setTermSettings(fd, argp) ((void)0)
|
|
#endif /* FEATURE_USE_TERMIOS */
|
|
|
|
#define CONVERTED_TAB_SIZE 8
|
|
|
|
int more_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int more_main(int argc, char **argv)
|
|
{
|
|
int c = c; /* for gcc */
|
|
int lines;
|
|
int input = 0;
|
|
int spaces = 0;
|
|
int please_display_more_prompt;
|
|
struct stat st;
|
|
FILE *file;
|
|
FILE *cin;
|
|
int len;
|
|
int terminal_width;
|
|
int terminal_height;
|
|
|
|
INIT_G();
|
|
|
|
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;
|
|
new_settings.c_cc[VMIN] = 1;
|
|
new_settings.c_cc[VTIME] = 0;
|
|
setTermSettings(cin_fileno, &new_settings);
|
|
signal(SIGINT, gotsig);
|
|
signal(SIGQUIT, gotsig);
|
|
signal(SIGTERM, gotsig);
|
|
#endif
|
|
|
|
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 (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.
|
|
*/
|
|
for (;;) {
|
|
input = getc(cin);
|
|
input = tolower(input);
|
|
#if !ENABLE_FEATURE_USE_TERMIOS
|
|
printf("\033[A"); /* up cursor */
|
|
#endif
|
|
/* 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;
|
|
#endif
|
|
}
|
|
|
|
/* Crudely convert tabs into spaces, which are
|
|
* a bajillion times easier to deal with. */
|
|
if (c == '\t') {
|
|
spaces = CONVERTED_TAB_SIZE - 1;
|
|
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
|
|
*
|
|
* 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.
|
|
*/
|
|
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 (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);
|
|
}
|
|
fclose(file);
|
|
fflush(stdout);
|
|
} while (*argv && *++argv);
|
|
end:
|
|
setTermSettings(cin_fileno, &initial_settings);
|
|
return 0;
|
|
}
|