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*: use _exit() in sighandlers; showkey: do not use exit-thru-sighandler

Browse Source 
While at it, make ESC sequences more readable; and removed check for
isatty(stdin) in reset. Code shrink:

   text    data     bss     dec     hex filename
 884771     936   17216  902923   dc70b busybox_old
 884723     936   17216  902875   dc6db busybox_unstripped

Signed-off-by: Marek Polacek <mmpolacek@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Marek Polacek 2010-10-28 21:34:56 +02:00 committed by Denys Vlasenko
parent 02788ac7e2
commit 7b18107384
8 changed files with 78 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
console-tools/reset.c
View File

@ -8,11 +8,13 @@
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
/* BTW, which "standard" package has this utility? It doesn't seem
* to be ncurses, coreutils, console-tools... then what? */
#include "libbb.h"
#define ESC "\033"
#if ENABLE_STTY
int stty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
#endif
@ -26,15 +28,15 @@ int reset_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
/* no options, no getopt */
if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
if (/*isatty(STDIN_FILENO) &&*/ isatty(STDOUT_FILENO)) {
/* See 'man 4 console_codes' for details:
* "ESC c" -- Reset
* "ESC ( K" -- Select user mapping
* "ESC [ J" -- Erase to the end of screen
* "ESC [ 0 m" -- Reset all display attributes
* "ESC [ J" -- Erase to the end of screen
* "ESC [ ? 25 h" -- Make cursor visible
*/
printf("\033c\033(K\033[J\033[0m\033[?25h");
printf(ESC"c" ESC"(K" ESC"[0m" ESC"[J" ESC"[?25h");
/* http://bugs.busybox.net/view.php?id=1414:
* people want it to reset echo etc: */
#if ENABLE_STTY

2
console-tools/resize.c
View File

@ -17,7 +17,7 @@ static void
onintr(int sig UNUSED_PARAM)
{
tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
exit(EXIT_FAILURE);
_exit(EXIT_FAILURE);
}
int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;

73
console-tools/showkey.c
View File

@ -10,27 +10,7 @@
#include "libbb.h"
#include <linux/kd.h>
// set raw tty mode
// also used by microcom
// libbb candidates?
static void xget1(struct termios *t, struct termios *oldt)
{
tcgetattr(STDIN_FILENO, oldt);
*t = *oldt;
cfmakeraw(t);
}
static void xset1(struct termios *tio)
{
int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, tio);
if (ret) {
bb_perror_msg("can't tcsetattr for stdin");
}
}
/*
* GLOBALS
*/
struct globals {
int kbmode;
struct termios tio, tio0;
@ -44,13 +24,22 @@ struct globals {
} while (0)
static void signal_handler(int signo)
// set raw tty mode
// also used by microcom
// libbb candidates?
static void xget1(struct termios *t, struct termios *oldt)
{
// restore keyboard and console settings
xset1(&tio0);
xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
// alarmed? -> exit 0
exit(SIGALRM == signo);
tcgetattr(STDIN_FILENO, oldt);
*t = *oldt;
cfmakeraw(t);
}
static void xset1(struct termios *t)
{
int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, t);
if (ret) {
bb_perror_msg("can't tcsetattr for stdin");
}
}
int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
@ -62,20 +51,21 @@ int showkey_main(int argc UNUSED_PARAM, char **argv)
OPT_s = (1<<2), // display only the raw scan-codes
};
INIT_G();
// FIXME: aks are all mutually exclusive
getopt32(argv, "aks");
INIT_G();
// get keyboard settings
xioctl(STDIN_FILENO, KDGKBMODE, &kbmode);
printf("kb mode was %s\n\nPress any keys. Program terminates %s\n\n",
kbmode == K_RAW ? "RAW" :
(kbmode == K_XLATE ? "XLATE" :
(kbmode == K_MEDIUMRAW ? "MEDIUMRAW" :
(kbmode == K_UNICODE ? "UNICODE" : "?UNKNOWN?")))
, (option_mask32 & OPT_a) ? "when CTRL+D pressed" : "10s after last keypress"
(kbmode == K_UNICODE ? "UNICODE" : "UNKNOWN")))
, (option_mask32 & OPT_a) ? "on EOF (ctrl-D)" : "10s after last keypress"
);
// prepare for raw mode
xget1(&tio, &tio0);
// put stdin in raw mode
@ -83,34 +73,37 @@ int showkey_main(int argc UNUSED_PARAM, char **argv)
if (option_mask32 & OPT_a) {
unsigned char c;
// just read stdin char by char
while (1 == safe_read(STDIN_FILENO, &c, 1)) {
while (1 == read(STDIN_FILENO, &c, 1)) {
printf("%3u 0%03o 0x%02x\r\n", c, c, c);
if (04 /*CTRL-D*/ == c)
break;
}
} else {
// we should exit on any signal
bb_signals(BB_FATAL_SIGS, signal_handler);
// set raw keyboard mode
xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));
// we should exit on any signal; signals should interrupt read
bb_signals_recursive_norestart(BB_FATAL_SIGS, record_signo);
// read and show scancodes
while (1) {
while (!bb_got_signal) {
char buf[18];
int i, n;
// setup 10s watchdog
alarm(10);
// read scancodes
n = read(STDIN_FILENO, buf, sizeof(buf));
i = 0;
while (i < n) {
char c = buf[i];
// show raw scancodes ordered? ->
if (option_mask32 & OPT_s) {
// show raw scancodes
printf("0x%02x ", buf[i++]);
// show interpreted scancodes (default) ? ->
} else {
// show interpreted scancodes (default)
char c = buf[i];
int kc;
if (i+2 < n
&& (c & 0x7f) == 0
@ -130,9 +123,9 @@ int showkey_main(int argc UNUSED_PARAM, char **argv)
}
}
// cleanup
signal_handler(SIGALRM);
// restore keyboard and console settings
xset1(&tio0);
xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
// should never be here!
return EXIT_SUCCESS;
}

20
libbb/lineedit.c
View File

@ -94,8 +94,10 @@ static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
#endif
#define SEQ_CLEAR_TILL_END_OF_SCREEN "\033[J"
//#define SEQ_CLEAR_TILL_END_OF_LINE "\033[K"
#define ESC "\033"
#define SEQ_CLEAR_TILL_END_OF_SCREEN ESC"[J"
//#define SEQ_CLEAR_TILL_END_OF_LINE ESC"[K"
enum {
@ -446,7 +448,7 @@ static void input_backward(unsigned num)
} while (--num);
return;
}
printf("\033[%uD", num);
printf(ESC"[%uD", num);
return;
}
@ -471,7 +473,7 @@ static void input_backward(unsigned num)
*/
unsigned sv_cursor;
/* go to 1st column; go up to first line */
printf("\r" "\033[%uA", cmdedit_y);
printf("\r" ESC"[%uA", cmdedit_y);
cmdedit_y = 0;
sv_cursor = cursor;
put_prompt(); /* sets cursor to 0 */
@ -488,12 +490,12 @@ static void input_backward(unsigned num)
cmdedit_x = (width * cmdedit_y - num) % width;
cmdedit_y -= lines_up;
/* go to 1st column; go up */
printf("\r" "\033[%uA", lines_up);
printf("\r" ESC"[%uA", lines_up);
/* go to correct column.
* xterm, konsole, Linux VT interpret 0 as 1 below! wow.
* need to *make sure* we skip it if cmdedit_x == 0 */
if (cmdedit_x)
printf("\033[%uC", cmdedit_x);
printf(ESC"[%uC", cmdedit_x);
}
}
@ -501,7 +503,7 @@ static void input_backward(unsigned num)
static void redraw(int y, int back_cursor)
{
if (y > 0) /* up y lines */
printf("\033[%uA", y);
printf(ESC"[%uA", y);
bb_putchar('\r');
put_prompt();
put_till_end_and_adv_cursor();
@ -1626,7 +1628,7 @@ static void ask_terminal(void)
pfd.events = POLLIN;
if (safe_poll(&pfd, 1, 0) == 0) {
S.sent_ESC_br6n = 1;
fputs("\033" "[6n", stdout);
fputs(ESC"[6n", stdout);
fflush_all(); /* make terminal see it ASAP! */
}
}
@ -2074,7 +2076,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
case CTRL('L'):
vi_case(CTRL('L')|VI_CMDMODE_BIT:)
/* Control-l -- clear screen */
printf("\033[H"); /* cursor to top,left */
printf(ESC"[H"); /* cursor to top,left */
redraw(0, command_len - cursor);
break;
#if MAX_HISTORY > 0

13
miscutils/conspy.c
View File

@ -43,6 +43,9 @@
#include "libbb.h"
#include <sys/kd.h>
#define ESC "\033"
struct screen_info {
unsigned char lines, cols, cursor_x, cursor_y;
};
@ -70,7 +73,7 @@ struct globals {
unsigned col;
unsigned line;
smallint curoff; // unknown:0 cursor on:-1 cursor off:1
char attrbuf[sizeof("\033[0;1;5;30;40m")];
char attrbuf[sizeof(ESC"[0;1;5;30;40m")];
// remote console
struct screen_info remote;
// saved local tty terminfo
@ -101,7 +104,7 @@ enum {
static void clrscr(void)
{
// Home, clear till end of screen
fputs("\033[1;1H" "\033[J", stdout);
fputs(ESC"[1;1H" ESC"[J", stdout);
G.col = G.line = 0;
}
@ -109,7 +112,7 @@ static void set_cursor(int state)
{
if (G.curoff != state) {
G.curoff = state;
fputs("\033[?25", stdout);
fputs(ESC"[?25", stdout);
bb_putchar("h?l"[1 + state]);
}
}
@ -119,7 +122,7 @@ static void gotoxy(int col, int line)
if (G.col != col || G.line != line) {
G.col = col;
G.line = line;
printf("\033[%u;%uH", line + 1, col + 1);
printf(ESC"[%u;%uH", line + 1, col + 1);
}
}
@ -132,7 +135,7 @@ static void cleanup(int code)
}
// Reset attributes
if (!BW)
fputs("\033[0m", stdout);
fputs(ESC"[0m", stdout);
bb_putchar('\n');
if (code > 1)
kill_myself_with_sig(code);

14
miscutils/less.c
View File

@ -28,13 +28,15 @@
#include "xregex.h"
#endif
#define ESC "\033"
/* The escape codes for highlighted and normal text */
#define HIGHLIGHT "\033[7m"
#define NORMAL "\033[0m"
#define HIGHLIGHT ESC"[7m"
#define NORMAL ESC"[0m"
/* The escape code to home and clear to the end of screen */
#define CLEAR "\033[H\033[J"
#define CLEAR ESC"[H\033[J"
/* The escape code to clear to the end of line */
#define CLEAR_2_EOL "\033[K"
#define CLEAR_2_EOL ESC"[K"
enum {
/* Absolute max of lines eaten */
@ -165,12 +167,12 @@ static void set_tty_cooked(void)
top-left corner of the console */
static void move_cursor(int line, int row)
{
printf("\033[%u;%uH", line, row);
printf(ESC"[%u;%uH", line, row);
}
static void clear_line(void)
{
printf("\033[%u;0H" CLEAR_2_EOL, max_displayed_line + 2);
printf(ESC"[%u;0H" CLEAR_2_EOL, max_displayed_line + 2);
}
static void print_hilite(const char *str)

2
miscutils/watchdog.c
View File

@ -24,7 +24,7 @@ static void watchdog_shutdown(int sig UNUSED_PARAM)
write(3, &V, 1); /* Magic, see watchdog-api.txt in kernel */
if (ENABLE_FEATURE_CLEAN_UP)
close(3);
exit(EXIT_SUCCESS);
_exit(EXIT_SUCCESS);
}
int watchdog_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;

14
util-linux/more.c
View File

@ -29,16 +29,20 @@ struct globals {
#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 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)
{
bb_putchar('\n');
/* 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);
_exit(EXIT_FAILURE);
}
#define CONVERTED_TAB_SIZE 8