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authorDenys Vlasenko <vda.linux@googlemail.com>2009-05-15 01:27:53 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2009-05-15 01:27:53 (GMT)
commitc15f40c3e7bfeae1b616c53a574308c2df707b3d (patch)
tree402bed67555916e3ff3c6a08ccc6e994372d4524
parent1b0a93edb93a93c30d7fbb35571f109ddf8a67a2 (diff)
downloadbusybox-c15f40c3e7bfeae1b616c53a574308c2df707b3d.tar.gz
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lineedit: use read_key to recognize ESC sequence.
This fixes several vi mode bugs and prepares for further fixes. function old new delta read_line_input 3287 5511 +2224 remember_in_history - 499 +499 lineedit_read_key - 70 +70 read_key 321 332 +11 input_tab 2823 - -2823 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 2/0 up/down: 2804/-2823) Total: -19 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--include/libbb.h24
-rw-r--r--libbb/lineedit.c309
-rw-r--r--libbb/read_key.c1
3 files changed, 158 insertions, 176 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 3a94a00..128aa92 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1198,23 +1198,23 @@ unsigned long long bb_makedev(unsigned int major, unsigned int minor) FAST_FUNC;
#if ENABLE_FEATURE_EDITING
/* It's NOT just ENABLEd or disabled. It's a number: */
-#ifdef CONFIG_FEATURE_EDITING_HISTORY
-# define MAX_HISTORY (CONFIG_FEATURE_EDITING_HISTORY + 0)
-#else
-# define MAX_HISTORY 0
-#endif
+# ifdef CONFIG_FEATURE_EDITING_HISTORY
+# define MAX_HISTORY (CONFIG_FEATURE_EDITING_HISTORY + 0)
+# else
+# define MAX_HISTORY 0
+# endif
typedef struct line_input_t {
int flags;
const char *path_lookup;
-#if MAX_HISTORY
+# if MAX_HISTORY
int cnt_history;
int cur_history;
-#if ENABLE_FEATURE_EDITING_SAVEHISTORY
+# if ENABLE_FEATURE_EDITING_SAVEHISTORY
unsigned cnt_history_in_file;
const char *hist_file;
-#endif
+# endif
char *history[MAX_HISTORY + 1];
-#endif
+# endif
} line_input_t;
enum {
DO_HISTORY = 1 * (MAX_HISTORY > 0),
@@ -1241,12 +1241,12 @@ int read_line_input(const char* prompt, char* command, int maxsize) FAST_FUNC;
#ifndef COMM_LEN
-#ifdef TASK_COMM_LEN
+# ifdef TASK_COMM_LEN
enum { COMM_LEN = TASK_COMM_LEN };
-#else
+# else
/* synchronize with sizeof(task_struct.comm) in /usr/include/linux/sched.h */
enum { COMM_LEN = 16 };
-#endif
+# endif
#endif
typedef struct procps_status_t {
DIR *dir;
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index e0ab732..ccf3e0d 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -1430,6 +1430,22 @@ static void win_changed(int nsig)
signal(SIGWINCH, win_changed); /* rearm ourself */
}
+static int lineedit_read_key(smalluint *read_key_bufsize, char *read_key_buffer)
+{
+ int ic;
+ struct pollfd pfd;
+ pfd.fd = STDIN_FILENO;
+ pfd.events = POLLIN;
+ do {
+ /* Wait for input. Can't just call read_key, it will return
+ * at once if stdin is in non-blocking mode. */
+ safe_poll(&pfd, 1, -1);
+ /* note: read_key sets errno to 0 on success: */
+ ic = read_key(STDIN_FILENO, read_key_bufsize, read_key_buffer);
+ } while (errno == EAGAIN);
+ return ic;
+}
+
/*
* The emacs and vi modes share much of the code in the big
* command loop. Commands entered when in vi's command mode (aka
@@ -1438,7 +1454,7 @@ static void win_changed(int nsig)
* big switch a bit, but keeps all the code in one place.
*/
-#define vbit 0x100
+#define VI_CMDMODE_BIT 0x100
/* leave out the "vi-mode"-only case labels if vi editing isn't
* configured. */
@@ -1459,15 +1475,15 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
#if ENABLE_FEATURE_TAB_COMPLETION
smallint lastWasTab = FALSE;
#endif
- unsigned ic;
- unsigned char c;
+ int ic;
smallint break_out = 0;
#if ENABLE_FEATURE_EDITING_VI
smallint vi_cmdmode = 0;
- smalluint prevc;
#endif
struct termios initial_settings;
struct termios new_settings;
+ smalluint read_key_bufsize;
+ char read_key_buffer[KEYCODE_BUFFER_SIZE];
INIT_S();
@@ -1545,42 +1561,40 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
while (1) {
fflush(NULL);
-
- if (nonblock_safe_read(STDIN_FILENO, &c, 1) < 1) {
- /* if we can't read input then exit */
- goto prepare_to_die;
- }
-
- ic = c;
+ ic = lineedit_read_key(&read_key_bufsize, read_key_buffer);
#if ENABLE_FEATURE_EDITING_VI
newdelflag = 1;
- if (vi_cmdmode)
- ic |= vbit;
+ if (vi_cmdmode) {
+ /* btw, since KEYCODE_xxx are all < 0, this doesn't
+ * change ic if it contains one of them: */
+ ic |= VI_CMDMODE_BIT;
+ }
#endif
+
switch (ic) {
case '\n':
case '\r':
- vi_case('\n'|vbit:)
- vi_case('\r'|vbit:)
+ vi_case('\n'|VI_CMDMODE_BIT:)
+ vi_case('\r'|VI_CMDMODE_BIT:)
/* Enter */
goto_new_line();
break_out = 1;
break;
case CTRL('A'):
- vi_case('0'|vbit:)
+ vi_case('0'|VI_CMDMODE_BIT:)
/* Control-a -- Beginning of line */
input_backward(cursor);
break;
case CTRL('B'):
- vi_case('h'|vbit:)
- vi_case('\b'|vbit:)
- vi_case('\x7f'|vbit:) /* DEL */
+ vi_case('h'|VI_CMDMODE_BIT:)
+ vi_case('\b'|VI_CMDMODE_BIT:)
+ vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
/* Control-b -- Move back one character */
input_backward(1);
break;
case CTRL('C'):
- vi_case(CTRL('C')|vbit:)
+ vi_case(CTRL('C')|VI_CMDMODE_BIT:)
/* Control-c -- stop gathering input */
goto_new_line();
command_len = 0;
@@ -1598,31 +1612,27 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
}
input_delete(0);
break;
-
case CTRL('E'):
- vi_case('$'|vbit:)
+ vi_case('$'|VI_CMDMODE_BIT:)
/* Control-e -- End of line */
input_end();
break;
case CTRL('F'):
- vi_case('l'|vbit:)
- vi_case(' '|vbit:)
+ vi_case('l'|VI_CMDMODE_BIT:)
+ vi_case(' '|VI_CMDMODE_BIT:)
/* Control-f -- Move forward one character */
input_forward();
break;
-
case '\b':
case '\x7f': /* DEL */
/* Control-h and DEL */
input_backspace();
break;
-
#if ENABLE_FEATURE_TAB_COMPLETION
case '\t':
input_tab(&lastWasTab);
break;
#endif
-
case CTRL('K'):
/* Control-k -- clear to end of line */
command[cursor] = 0;
@@ -1630,31 +1640,29 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
printf("\033[J");
break;
case CTRL('L'):
- vi_case(CTRL('L')|vbit:)
+ vi_case(CTRL('L')|VI_CMDMODE_BIT:)
/* Control-l -- clear screen */
printf("\033[H");
redraw(0, command_len - cursor);
break;
-
#if MAX_HISTORY > 0
case CTRL('N'):
- vi_case(CTRL('N')|vbit:)
- vi_case('j'|vbit:)
+ vi_case(CTRL('N')|VI_CMDMODE_BIT:)
+ vi_case('j'|VI_CMDMODE_BIT:)
/* Control-n -- Get next command in history */
if (get_next_history())
goto rewrite_line;
break;
case CTRL('P'):
- vi_case(CTRL('P')|vbit:)
- vi_case('k'|vbit:)
+ vi_case(CTRL('P')|VI_CMDMODE_BIT:)
+ vi_case('k'|VI_CMDMODE_BIT:)
/* Control-p -- Get previous command from history */
if (get_previous_history())
goto rewrite_line;
break;
#endif
-
case CTRL('U'):
- vi_case(CTRL('U')|vbit:)
+ vi_case(CTRL('U')|VI_CMDMODE_BIT:)
/* Control-U -- Clear line before cursor */
if (cursor) {
overlapping_strcpy(command, command + cursor);
@@ -1663,7 +1671,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
}
break;
case CTRL('W'):
- vi_case(CTRL('W')|vbit:)
+ vi_case(CTRL('W')|VI_CMDMODE_BIT:)
/* Control-W -- Remove the last word */
while (cursor > 0 && isspace(command[cursor-1]))
input_backspace();
@@ -1672,75 +1680,80 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
break;
#if ENABLE_FEATURE_EDITING_VI
- case 'i'|vbit:
+ case 'i'|VI_CMDMODE_BIT:
vi_cmdmode = 0;
break;
- case 'I'|vbit:
+ case 'I'|VI_CMDMODE_BIT:
input_backward(cursor);
vi_cmdmode = 0;
break;
- case 'a'|vbit:
+ case 'a'|VI_CMDMODE_BIT:
input_forward();
vi_cmdmode = 0;
break;
- case 'A'|vbit:
+ case 'A'|VI_CMDMODE_BIT:
input_end();
vi_cmdmode = 0;
break;
- case 'x'|vbit:
+ case 'x'|VI_CMDMODE_BIT:
input_delete(1);
break;
- case 'X'|vbit:
+ case 'X'|VI_CMDMODE_BIT:
if (cursor > 0) {
input_backward(1);
input_delete(1);
}
break;
- case 'W'|vbit:
+ case 'W'|VI_CMDMODE_BIT:
vi_Word_motion(command, 1);
break;
- case 'w'|vbit:
+ case 'w'|VI_CMDMODE_BIT:
vi_word_motion(command, 1);
break;
- case 'E'|vbit:
+ case 'E'|VI_CMDMODE_BIT:
vi_End_motion(command);
break;
- case 'e'|vbit:
+ case 'e'|VI_CMDMODE_BIT:
vi_end_motion(command);
break;
- case 'B'|vbit:
+ case 'B'|VI_CMDMODE_BIT:
vi_Back_motion(command);
break;
- case 'b'|vbit:
+ case 'b'|VI_CMDMODE_BIT:
vi_back_motion(command);
break;
- case 'C'|vbit:
+ case 'C'|VI_CMDMODE_BIT:
vi_cmdmode = 0;
/* fall through */
- case 'D'|vbit:
+ case 'D'|VI_CMDMODE_BIT:
goto clear_to_eol;
- case 'c'|vbit:
+ case 'c'|VI_CMDMODE_BIT:
vi_cmdmode = 0;
/* fall through */
- case 'd'|vbit: {
+ case 'd'|VI_CMDMODE_BIT: {
int nc, sc;
+ int prev_ic;
+
sc = cursor;
- prevc = ic;
- if (safe_read(STDIN_FILENO, &c, 1) < 1)
+ prev_ic = ic;
+
+ ic = lineedit_read_key(&read_key_bufsize, read_key_buffer);
+ if (errno) /* error */
goto prepare_to_die;
- if (c == (prevc & 0xff)) {
+
+ if ((ic | VI_CMDMODE_BIT) == prev_ic) {
/* "cc", "dd" */
input_backward(cursor);
goto clear_to_eol;
break;
}
- switch (c) {
+ switch (ic) {
case 'w':
case 'W':
case 'e':
case 'E':
- switch (c) {
+ switch (ic) {
case 'w': /* "dw", "cw" */
vi_word_motion(command, vi_cmdmode);
break;
@@ -1763,7 +1776,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
break;
case 'b': /* "db", "cb" */
case 'B': /* implemented as B */
- if (c == 'b')
+ if (ic == 'b')
vi_back_motion(command);
else
vi_Back_motion(command);
@@ -1774,143 +1787,109 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
input_delete(1);
break;
case '$': /* "d$", "c$" */
- clear_to_eol:
+ clear_to_eol:
while (cursor < command_len)
input_delete(1);
break;
}
break;
}
- case 'p'|vbit:
+ case 'p'|VI_CMDMODE_BIT:
input_forward();
/* fallthrough */
- case 'P'|vbit:
+ case 'P'|VI_CMDMODE_BIT:
put();
break;
- case 'r'|vbit:
- if (safe_read(STDIN_FILENO, &c, 1) < 1)
+ case 'r'|VI_CMDMODE_BIT:
+ ic = lineedit_read_key(&read_key_bufsize, read_key_buffer);
+ if (errno) /* error */
goto prepare_to_die;
- if (c == 0)
+ if (ic < ' ' || ic > 255) {
beep();
- else {
- *(command + cursor) = c;
- bb_putchar(c);
+ } else {
+ command[cursor] = ic;
+ bb_putchar(ic);
bb_putchar('\b');
}
break;
-#endif /* FEATURE_COMMAND_EDITING_VI */
-
case '\x1b': /* ESC */
-
-#if ENABLE_FEATURE_EDITING_VI
if (state->flags & VI_MODE) {
- /* ESC: insert mode --> command mode */
+ /* insert mode --> command mode */
vi_cmdmode = 1;
input_backward(1);
- break;
- }
-#endif
- /* escape sequence follows */
- if (safe_read(STDIN_FILENO, &c, 1) < 1)
- goto prepare_to_die;
- /* different vt100 emulations */
- if (c == '[' || c == 'O') {
- vi_case('['|vbit:)
- vi_case('O'|vbit:)
- if (safe_read(STDIN_FILENO, &c, 1) < 1)
- goto prepare_to_die;
- }
- if (c >= '1' && c <= '9') {
- unsigned char dummy;
-
- if (safe_read(STDIN_FILENO, &dummy, 1) < 1)
- goto prepare_to_die;
- if (dummy != '~')
- c = '\0';
}
+ break;
+#endif /* FEATURE_COMMAND_EDITING_VI */
- switch (c) {
-#if ENABLE_FEATURE_TAB_COMPLETION
- case '\t': /* Alt-Tab */
- input_tab(&lastWasTab);
- break;
-#endif
#if MAX_HISTORY > 0
- case 'A':
- /* Up Arrow -- Get previous command from history */
- if (get_previous_history())
- goto rewrite_line;
- beep();
+ case KEYCODE_UP:
+ if (get_previous_history())
+ goto rewrite_line;
+ beep();
+ break;
+ case KEYCODE_DOWN:
+ if (!get_next_history())
break;
- case 'B':
- /* Down Arrow -- Get next command in history */
- if (!get_next_history())
- break;
rewrite_line:
- /* Rewrite the line with the selected history item */
- /* change command */
- command_len = strlen(strcpy(command, state->history[state->cur_history] ? : ""));
- /* redraw and go to eol (bol, in vi */
- redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
- break;
+ /* Rewrite the line with the selected history item */
+ /* change command */
+ command_len = strlen(strcpy(command, state->history[state->cur_history] ? : ""));
+ /* redraw and go to eol (bol, in vi) */
+ redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
+ break;
#endif
- case 'C':
- /* Right Arrow -- Move forward one character */
- input_forward();
- break;
- case 'D':
- /* Left Arrow -- Move back one character */
- input_backward(1);
- break;
- case '3':
- /* Delete */
- input_delete(0);
- break;
- case '1': // vt100? linux vt? or what?
- case '7': // vt100? linux vt? or what?
- case 'H': /* xterm's <Home> */
- input_backward(cursor);
- break;
- case '4': // vt100? linux vt? or what?
- case '8': // vt100? linux vt? or what?
- case 'F': /* xterm's <End> */
- input_end();
- break;
- default:
- c = '\0';
- beep();
- }
+ case KEYCODE_RIGHT:
+ input_forward();
+ break;
+ case KEYCODE_LEFT:
+ input_backward(1);
+ break;
+ case KEYCODE_DELETE:
+ input_delete(0);
+ break;
+ case KEYCODE_HOME:
+ input_backward(cursor);
+ break;
+ case KEYCODE_END:
+ input_end();
break;
- default: /* If it's regular input, do the normal thing */
-
- /* Control-V -- force insert of next char */
- if (c == CTRL('V')) {
- if (safe_read(STDIN_FILENO, &c, 1) < 1)
- goto prepare_to_die;
- if (c == 0) {
- beep();
- break;
- }
- }
-
-#if ENABLE_FEATURE_EDITING_VI
- if (vi_cmdmode) /* Don't self-insert */
+ default:
+// /* Control-V -- force insert of next char */
+// if (c == CTRL('V')) {
+// if (safe_read(STDIN_FILENO, &c, 1) < 1)
+// goto prepare_to_die;
+// if (c == 0) {
+// beep();
+// break;
+// }
+// }
+ if (ic < ' ' || ic > 255) {
+ /* If VI_CMDMODE_BIT is set, ic is >= 256
+ * and command mode ignores unexpected chars.
+ * Otherwise, we are here if ic is a
+ * control char or an unhandled ESC sequence,
+ * which is also ignored.
+ */
break;
-#endif
- if ((int)command_len >= (maxsize - 2)) /* Need to leave space for enter */
+ }
+ if ((int)command_len >= (maxsize - 2)) {
+ /* Not enough space for the char and EOL */
break;
+ }
command_len++;
- if (cursor == (command_len - 1)) { /* Append if at the end of the line */
- command[cursor] = c;
- command[cursor+1] = '\0';
+ if (cursor == (command_len - 1)) {
+ /* We are at the end, append */
+ command[cursor] = ic;
+ command[cursor + 1] = '\0';
cmdedit_set_out_char(' ');
- } else { /* Insert otherwise */
+ } else {
+ /* In the middle, insert */
int sc = cursor;
memmove(command + sc + 1, command + sc, command_len - sc);
- command[sc] = c;
+ command[sc] = ic;
sc++;
/* rewrite from cursor */
input_end();
@@ -1918,15 +1897,17 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
input_backward(cursor - sc);
}
break;
- }
- if (break_out) /* Enter is the command terminator, no more input. */
+ } /* switch (input_key) */
+
+ if (break_out)
break;
#if ENABLE_FEATURE_TAB_COMPLETION
- if (c != '\t')
+ ic &= ~VI_CMDMODE_BIT;
+ if (ic != '\t')
lastWasTab = FALSE;
#endif
- }
+ } /* while (1) */
if (command_len > 0)
remember_in_history(command);
diff --git a/libbb/read_key.c b/libbb/read_key.c
index 0f36d20..fd100b0 100644
--- a/libbb/read_key.c
+++ b/libbb/read_key.c
@@ -66,6 +66,7 @@ int FAST_FUNC read_key(int fd, smalluint *nbuffered, char *buffer)
0
};
+ errno = 0;
n = 0;
if (nbuffered)
n = *nbuffered;