/*
* Usage and known bugs:
- * Terminal key codes are not extensive, and more will probably
- * need to be added. This version was created on Debian GNU/Linux 2.x.
+ * Terminal key codes are not extensive, more needs to be added.
+ * This version was created on Debian GNU/Linux 2.x.
* Delete, Backspace, Home, End, and the arrow keys were tested
* to work in an Xterm and console. Ctrl-A also works as Home.
* Ctrl-E also works as End.
*
+ * The following readline-like commands are not implemented:
+ * ESC-b -- Move back one word
+ * ESC-f -- Move forward one word
+ * ESC-d -- Delete forward one word
+ * CTL-t -- Transpose two characters
+ *
* lineedit does not know that the terminal escape sequences do not
* take up space on the screen. The redisplay code assumes, unless
* told otherwise, that each character in the prompt is a printable
#if ENABLE_FEATURE_ASSUME_UNICODE
# define BB_NUL L'\0'
# define CHAR_T wchar_t
-# define BB_isspace(c) iswspace(c)
-# define BB_isalnum(c) iswalnum(c)
-# define BB_ispunct(c) iswpunct(c)
-# define BB_isprint(c) iswprint(c)
-/* this catches bugs */
+static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
+static bool BB_isalnum(CHAR_T c) { return ((unsigned)c < 256 && isalnum(c)); }
+static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
# undef isspace
# undef isalnum
# undef ispunct
# define BB_isspace(c) isspace(c)
# define BB_isalnum(c) isalnum(c)
# define BB_ispunct(c) ispunct(c)
-# if ENABLE_LOCALE_SUPPORT
-# define BB_isprint(c) isprint(c)
-# else
-# define BB_isprint(c) ((c) >= ' ' && (c) != ((unsigned char)'\233'))
-# endif
#endif
unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
unsigned cursor;
- unsigned command_len;
- /* *int* maxsize: we want x in "if (x > S.maxsize)"
+ int command_len; /* must be signed */
+ /* signed maxsize: we want x in "if (x > S.maxsize)"
* to _not_ be promoted to unsigned */
int maxsize;
CHAR_T *command_ps;
smallint newdelflag; /* whether delbuf should be reused yet */
CHAR_T delbuf[DELBUFSIZ]; /* a place to store deleted characters */
#endif
+#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
+ smallint sent_ESC_br6n;
+#endif
/* Formerly these were big buffers on stack: */
#if ENABLE_FEATURE_TAB_COMPLETION
static void put_prompt(void)
{
+ unsigned w;
+
out1str(cmdedit_prompt);
- if (ENABLE_FEATURE_EDITING_ASK_TERMINAL) {
- /* Ask terminal where is the cursor now.
- * lineedit_read_key handles response and corrects
- * our idea of current cursor position.
- * Testcase: run "echo -n long_line_long_line_long_line",
- * then type in a long, wrapping command and try to
- * delete it using backspace key.
- * Note: we print it _after_ prompt, because
- * prompt may contain CR. Example: PS1='\[\r\n\]\w '
- */
- out1str("\033" "[6n");
- }
+ fflush_all();
cursor = 0;
- {
- unsigned w = cmdedit_termw; /* volatile var */
- cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
- cmdedit_x = cmdedit_prmt_len % w;
- }
+ w = cmdedit_termw; /* read volatile var once */
+ cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
+ cmdedit_x = cmdedit_prmt_len % w;
}
/* draw prompt, editor line, and clear tail */
#endif /* MAX_HISTORY */
+#if ENABLE_FEATURE_EDITING_VI
/*
- * This function is used to grab a character buffer
- * from the input file descriptor and allows you to
- * a string with full command editing (sort of like
- * a mini readline).
- *
- * The following standard commands are not implemented:
- * ESC-b -- Move back one word
- * ESC-f -- Move forward one word
- * ESC-d -- Delete back one word
- * ESC-h -- Delete forward one word
- * CTL-t -- Transpose two characters
- *
- * Minimalist vi-style command line editing available if configured.
* vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
*/
-
-#if ENABLE_FEATURE_EDITING_VI
static void
vi_Word_motion(int eat)
{
}
#endif
+/* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
+static void ctrl_left(void)
+{
+ CHAR_T *command = command_ps;
+
+ while (1) {
+ CHAR_T c;
+
+ input_backward(1);
+ if (cursor == 0)
+ break;
+ c = command[cursor];
+ if (c != ' ' && !BB_ispunct(c)) {
+ /* we reached a "word" delimited by spaces/punct.
+ * go to its beginning */
+ while (1) {
+ c = command[cursor - 1];
+ if (c == ' ' || BB_ispunct(c))
+ break;
+ input_backward(1);
+ if (cursor == 0)
+ break;
+ }
+ break;
+ }
+ }
+}
+static void ctrl_right(void)
+{
+ CHAR_T *command = command_ps;
+
+ while (1) {
+ CHAR_T c;
+
+ c = command[cursor];
+ if (c == BB_NUL)
+ break;
+ if (c != ' ' && !BB_ispunct(c)) {
+ /* we reached a "word" delimited by spaces/punct.
+ * go to its end + 1 */
+ while (1) {
+ input_forward();
+ c = command[cursor];
+ if (c == BB_NUL || c == ' ' || BB_ispunct(c))
+ break;
+ }
+ break;
+ }
+ input_forward();
+ }
+}
+
/*
* read_line_input and its helpers
*/
+#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
+static void ask_terminal(void)
+{
+ /* Ask terminal where is the cursor now.
+ * lineedit_read_key handles response and corrects
+ * our idea of current cursor position.
+ * Testcase: run "echo -n long_line_long_line_long_line",
+ * then type in a long, wrapping command and try to
+ * delete it using backspace key.
+ * Note: we print it _after_ prompt, because
+ * prompt may contain CR. Example: PS1='\[\r\n\]\w '
+ */
+ /* Problem: if there is buffered input on stdin,
+ * the response will be delivered later,
+ * possibly to an unsuspecting application.
+ * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
+ * Result:
+ * ~/srcdevel/bbox/fix/busybox.t4 #
+ * ~/srcdevel/bbox/fix/busybox.t4 #
+ * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 # <-- garbage
+ * ~/srcdevel/bbox/fix/busybox.t4 #
+ *
+ * Checking for input with poll only makes the race narrower,
+ * I still can trigger it. Strace:
+ *
+ * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
+ * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout) <-- no input exists
+ * write(1, "\33[6n", 4) = 4 <-- send the ESC sequence, quick!
+ * poll([{fd=0, events=POLLIN}], 1, 4294967295) = 1 ([{fd=0, revents=POLLIN}])
+ * read(0, "\n", 1) = 1 <-- oh crap, user's input got in first
+ */
+ struct pollfd pfd;
+
+ pfd.fd = STDIN_FILENO;
+ pfd.events = POLLIN;
+ if (safe_poll(&pfd, 1, 0) == 0) {
+ S.sent_ESC_br6n = 1;
+ out1str("\033" "[6n");
+ fflush_all(); /* make terminal see it ASAP! */
+ }
+}
+#else
+#define ask_terminal() ((void)0)
+#endif
+
#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
static void parse_and_put_prompt(const char *prmt_ptr)
{
int new_y = (cursor + cmdedit_prmt_len) / w;
/* redraw */
redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
- fflush(stdout);
+ fflush_all();
}
}
pfd.fd = STDIN_FILENO;
pfd.events = POLLIN;
do {
+#if ENABLE_FEATURE_EDITING_ASK_TERMINAL || ENABLE_FEATURE_ASSUME_UNICODE
poll_again:
+#endif
if (read_key_buffer[0] == 0) {
/* Wait for input. Can't just call read_key,
* it returns at once if stdin
}
/* Note: read_key sets errno to 0 on success: */
ic = read_key(STDIN_FILENO, read_key_buffer);
- if (ENABLE_FEATURE_EDITING_ASK_TERMINAL
- && (int32_t)ic == KEYCODE_CURSOR_POS
+
+#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
+ if ((int32_t)ic == KEYCODE_CURSOR_POS
+ && S.sent_ESC_br6n
) {
- int col = ((ic >> 32) & 0x7fff) - 1;
- if (col > cmdedit_prmt_len) {
- cmdedit_x += (col - cmdedit_prmt_len);
- while (cmdedit_x >= cmdedit_termw) {
- cmdedit_x -= cmdedit_termw;
- cmdedit_y++;
+ S.sent_ESC_br6n = 0;
+ if (cursor == 0) { /* otherwise it may be bogus */
+ int col = ((ic >> 32) & 0x7fff) - 1;
+ if (col > cmdedit_prmt_len) {
+ cmdedit_x += (col - cmdedit_prmt_len);
+ while (cmdedit_x >= cmdedit_termw) {
+ cmdedit_x -= cmdedit_termw;
+ cmdedit_y++;
+ }
}
}
goto poll_again;
}
+#endif
#if ENABLE_FEATURE_ASSUME_UNICODE
{
) {
/* Happens when e.g. stty -echo was run before */
parse_and_put_prompt(prompt);
- fflush(stdout);
+ /* fflush_all(); - done by parse_and_put_prompt */
if (fgets(command, maxsize, stdin) == NULL)
len = -1; /* EOF or error */
else
bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
#endif
- /* Print out the command prompt */
+ /* Print out the command prompt, optionally ask where cursor is */
parse_and_put_prompt(prompt);
+ ask_terminal();
read_key_buffer[0] = 0;
while (1) {
VI_CMDMODE_BIT = 0x40000000,
/* 0x80000000 bit flags KEYCODE_xxx */
};
- int32_t ic;
+ int32_t ic, ic_raw;
- fflush(NULL);
- ic = lineedit_read_key(read_key_buffer);
+ fflush_all();
+ ic = ic_raw = lineedit_read_key(read_key_buffer);
#if ENABLE_FEATURE_EDITING_VI
newdelflag = 1;
/* Control-b -- Move back one character */
input_backward(1);
break;
- case CTRL('C'):
- vi_case(CTRL('C')|VI_CMDMODE_BIT:)
- /* Control-c -- stop gathering input */
- goto_new_line();
- command_len = 0;
- break_out = -1; /* "do not append '\n'" */
- break;
- case CTRL('D'):
- /* Control-d -- Delete one character, or exit
- * if the len=0 and no chars to delete */
- if (command_len == 0) {
- errno = 0;
-#if ENABLE_FEATURE_EDITING_VI
- prepare_to_die:
-#endif
- /* to control stopped jobs */
- break_out = command_len = -1;
- break;
- }
- input_delete(0);
- break;
case CTRL('E'):
vi_case('$'|VI_CMDMODE_BIT:)
/* Control-e -- End of line */
/* fall through */
case 'd'|VI_CMDMODE_BIT: {
int nc, sc;
- int prev_ic;
-
- sc = cursor;
- prev_ic = ic;
ic = lineedit_read_key(read_key_buffer);
if (errno) /* error */
goto prepare_to_die;
-
- if ((ic | VI_CMDMODE_BIT) == prev_ic) {
- /* "cc", "dd" */
+ if (ic == ic_raw) { /* "cc", "dd" */
input_backward(cursor);
goto clear_to_eol;
break;
}
+
+ sc = cursor;
switch (ic) {
case 'w':
case 'W':
put();
break;
case 'r'|VI_CMDMODE_BIT:
+//FIXME: unicode case?
ic = lineedit_read_key(read_key_buffer);
if (errno) /* error */
goto prepare_to_die;
case KEYCODE_LEFT:
input_backward(1);
break;
+ case KEYCODE_CTRL_LEFT:
+ ctrl_left();
+ break;
+ case KEYCODE_CTRL_RIGHT:
+ ctrl_right();
+ break;
case KEYCODE_DELETE:
input_delete(0);
break;
break;
default:
+ if (initial_settings.c_cc[VINTR] != 0
+ && ic_raw == initial_settings.c_cc[VINTR]
+ ) {
+ /* Ctrl-C (usually) - stop gathering input */
+ goto_new_line();
+ command_len = 0;
+ break_out = -1; /* "do not append '\n'" */
+ break;
+ }
+ if (initial_settings.c_cc[VEOF] != 0
+ && ic_raw == initial_settings.c_cc[VEOF]
+ ) {
+ /* Ctrl-D (usually) - delete one character,
+ * or exit if len=0 and no chars to delete */
+ if (command_len == 0) {
+ errno = 0;
+#if ENABLE_FEATURE_EDITING_VI
+ prepare_to_die:
+#endif
+ break_out = command_len = -1;
+ break;
+ }
+ input_delete(0);
+ break;
+ }
// /* Control-V -- force insert of next char */
// if (c == CTRL('V')) {
// if (safe_read(STDIN_FILENO, &c, 1) < 1)
|| (ENABLE_FEATURE_ASSUME_UNICODE && ic >= VI_CMDMODE_BIT)
) {
/* If VI_CMDMODE_BIT is set, ic is >= 256
- * and command mode ignores unexpected chars.
+ * and vi mode ignores unexpected chars.
* Otherwise, we are here if ic is a
* control char or an unhandled ESC sequence,
* which is also ignored.
input_backward(cursor - sc);
}
break;
- } /* switch (input_key) */
+ } /* switch (ic) */
if (break_out)
break;
#if ENABLE_FEATURE_TAB_COMPLETION
- ic &= ~VI_CMDMODE_BIT;
- if (ic != '\t')
+ if (ic_raw != '\t')
lastWasTab = FALSE;
#endif
} /* while (1) */
+#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
+ if (S.sent_ESC_br6n) {
+ /* "sleep 1; busybox ash" + hold [Enter] to trigger.
+ * We sent "ESC [ 6 n", but got '\n' first, and
+ * KEYCODE_CURSOR_POS response is now buffered from terminal.
+ * It's bad already and not much can be done with it
+ * (it _will_ be visible for the next process to read stdin),
+ * but without this delay it even shows up on the screen
+ * as garbage because we restore echo settings with tcsetattr
+ * before it comes in. UGLY!
+ */
+ usleep(20*1000);
+ }
+#endif
+
/* Stop bug catching using "command_must_not_be_used" trick */
#undef command
#if ENABLE_FEATURE_ASSUME_UNICODE
- command_len = save_string(command, maxsize - 1);
+ command[0] = '\0';
+ if (command_len > 0)
+ command_len = save_string(command, maxsize - 1);
free(command_ps);
#endif
tcsetattr_stdin_TCSANOW(&initial_settings);
/* restore SIGWINCH handler */
signal(SIGWINCH, previous_SIGWINCH_handler);
- fflush(stdout);
+ fflush_all();
len = command_len;
DEINIT_S();
int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
{
fputs(prompt, stdout);
- fflush(stdout);
+ fflush_all();
fgets(command, maxsize, stdin);
return strlen(command);
}
projects / oweals / busybox.git / blobdiff