hush/util-linux/more.c
Denis Vlasenko 68404f13d4 *: add -Wunused-parameter; fix resulting breakage
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
2008-03-17 09:00:54 +00:00

206 lines
5.3 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 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) tcsetattr(fd, TCSANOW, argp)
#define getTermSettings(fd, argp) tcgetattr(fd, argp)
static void gotsig(int sig ATTRIBUTE_UNUSED)
{
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 ATTRIBUTE_UNUSED, 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);
bb_signals(0
+ (1 << SIGINT)
+ (1 << SIGQUIT)
+ (1 << 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;
}