/* Delete the char in front of the cursor, optionally saving it
* for later putback */
static void input_delete(int save)
{
int j = cursor;
if (j == command_len)
return;
#if ENABLE_FEATURE_EDITING_VI
if (save) {
if (newdelflag) {
if (!delbuf)
delbuf = malloc(DELBUFSIZ);
/* safe if malloc fails */
delp = delbuf;
newdelflag = 0;
}
if (delbuf && (delp - delbuf < DELBUFSIZ))
*delp++ = command_ps[j];
}
#endif
strcpy(command_ps + j, command_ps + j + 1);
command_len--;
input_end(); /* rewrite new line */
cmdedit_set_out_char(' '); /* erase char */
input_backward(cursor - j); /* back to old pos cursor */
}
/* Move forward one character */
static void input_forward(void)
{
if (cursor < command_len)
cmdedit_set_out_char(command_ps[cursor + 1]);
}
/* Move to end of line (by printing all chars till the end) */
static void input_end(void)
{
while (cursor < command_len)
cmdedit_set_out_char(' ');
}
/* Returns:
* -1 on read errors or EOF, or on bare Ctrl-D.
* 0 on ctrl-C,
* >0 length of input string, including terminating '\n'
*/
int read_line_input(const char* prompt, char* command, int maxsize, line_input_t *st)
{
int lastWasTab = FALSE;
unsigned int ic;
unsigned char c;
smallint break_out = 0;
#if ENABLE_FEATURE_EDITING_VI
smallint vi_cmdmode = 0;
smalluint prevc;
#endif
if (maxsize > MAX_LINELEN)
maxsize = MAX_LINELEN;
/* With null flags, no other fields are ever used */
state = st ? st : (line_input_t*) &const_int_0;
#if ENABLE_FEATURE_EDITING_SAVEHISTORY
if ((state->flags & SAVE_HISTORY) && state->hist_file)
load_history(state->hist_file);
#endif
/* prepare before init handlers */
cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */
command_len = 0;
command_ps = command;
command[0] = '\0';
getTermSettings(0, (void *) &initial_settings);
memcpy(&new_settings, &initial_settings, sizeof(new_settings));
new_settings.c_lflag &= ~ICANON; /* unbuffered input */
/* Turn off echoing and CTRL-C, so we can trap it */
new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
/* Hmm, in linux c_cc[] is not parsed if ICANON is off */
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VTIME] = 0;
/* Turn off CTRL-C, so we can trap it */
#ifndef _POSIX_VDISABLE
#define _POSIX_VDISABLE '\0'
#endif
new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
setTermSettings(0, (void *) &new_settings);
/* Now initialize things */
previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
win_changed(0); /* do initial resizing */
#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
{
struct passwd *entry;
entry = getpwuid(geteuid());
if (entry) {
/* If we enter read_line_input for the Nth time,
* they may be already allocated! Need to free. */
free(user_buf);
if (home_pwd_buf != null_str)
free(home_pwd_buf);
user_buf = xstrdup(entry->pw_name);
home_pwd_buf = xstrdup(entry->pw_dir);
/* They are not freed on exit (too small to bother) */
}
}
#endif
/* Print out the command prompt */
parse_prompt(prompt);
while (1) {
fflush(stdout);
if (safe_read(0, &c, 1) < 1) {
/* if we can't read input then exit */
goto prepare_to_die;
}
ic = c;
#if ENABLE_FEATURE_EDITING_VI
newdelflag = 1;
if (vi_cmdmode)
ic |= vbit;
#endif
switch (ic) {
case '\n':
case '\r':
vi_case('\n'|vbit:)
vi_case('\r'|vbit:)
/* Enter */
goto_new_line();
break_out = 1;
break;
#if ENABLE_FEATURE_EDITING_FANCY_KEYS
case CTRL('A'):
vi_case('0'|vbit:)
/* 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 */
/* Control-b -- Move back one character */
input_backward(1);
break;
#endif
case CTRL('C'):
vi_case(CTRL('C')|vbit:)
/* 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;
prepare_to_die:
/* to control stopped jobs */
break_out = command_len = -1;
break;
}
input_delete(0);
break;
#if ENABLE_FEATURE_EDITING_FANCY_KEYS
case CTRL('E'):
vi_case('$'|vbit:)
/* Control-e -- End of line */
input_end();
break;
case CTRL('F'):
vi_case('l'|vbit:)
vi_case(' '|vbit:)
/* Control-f -- Move forward one character */
input_forward();
break;
#endif
case '\b':
case '\x7f': /* DEL */
/* Control-h and DEL */
input_backspace();
break;
case '\t':
input_tab(&lastWasTab);
break;
#if ENABLE_FEATURE_EDITING_FANCY_KEYS
case CTRL('K'):
/* Control-k -- clear to end of line */
command[cursor] = 0;
command_len = cursor;
printf("\033[J");
break;
case CTRL('L'):
vi_case(CTRL('L')|vbit:)
/* Control-l -- clear screen */
printf("\033[H");
redraw(0, command_len - cursor);
break;
#endif
#if MAX_HISTORY > 0
case CTRL('N'):
vi_case(CTRL('N')|vbit:)
vi_case('j'|vbit:)
/* 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:)
/* Control-p -- Get previous command from history */
if ((state->flags & DO_HISTORY) && state->cur_history > 0) {
get_previous_history();
goto rewrite_line;
}
beep();
break;
#endif
#if ENABLE_FEATURE_EDITING_FANCY_KEYS
case CTRL('U'):
vi_case(CTRL('U')|vbit:)
/* Control-U -- Clear line before cursor */
if (cursor) {
strcpy(command, command + cursor);
command_len -= cursor;
redraw(cmdedit_y, command_len);
}
break;
#endif
case CTRL('W'):
vi_case(CTRL('W')|vbit:)
/* Control-W -- Remove the last word */
while (cursor > 0 && isspace(command[cursor-1]))
input_backspace();
while (cursor > 0 && !isspace(command[cursor-1]))
input_backspace();
break;
#if ENABLE_FEATURE_EDITING_VI
case 'i'|vbit:
vi_cmdmode = 0;
break;
case 'I'|vbit:
input_backward(cursor);
vi_cmdmode = 0;
break;
case 'a'|vbit:
input_forward();
vi_cmdmode = 0;
break;
case 'A'|vbit:
input_end();
vi_cmdmode = 0;
break;
case 'x'|vbit:
input_delete(1);
break;
case 'X'|vbit:
if (cursor > 0) {
input_backward(1);
input_delete(1);
}
break;
case 'W'|vbit:
vi_Word_motion(command, 1);
break;
case 'w'|vbit:
vi_word_motion(command, 1);
break;
case 'E'|vbit:
vi_End_motion(command);
break;
case 'e'|vbit:
vi_end_motion(command);
break;
case 'B'|vbit:
vi_Back_motion(command);
break;
case 'b'|vbit:
vi_back_motion(command);
break;
case 'C'|vbit:
vi_cmdmode = 0;
/* fall through */
case 'D'|vbit:
goto clear_to_eol;
case 'c'|vbit:
vi_cmdmode = 0;
/* fall through */
case 'd'|vbit: {
int nc, sc;
sc = cursor;
prevc = ic;
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
if (c == (prevc & 0xff)) {
/* "cc", "dd" */
input_backward(cursor);
goto clear_to_eol;
break;
}
switch (c) {
case 'w':
case 'W':
case 'e':
case 'E':
switch (c) {
case 'w': /* "dw", "cw" */
vi_word_motion(command, vi_cmdmode);
break;
case 'W': /* 'dW', 'cW' */
vi_Word_motion(command, vi_cmdmode);
break;
case 'e': /* 'de', 'ce' */
vi_end_motion(command);
input_forward();
break;
case 'E': /* 'dE', 'cE' */
vi_End_motion(command);
input_forward();
break;
}
nc = cursor;
input_backward(cursor - sc);
while (nc-- > cursor)
input_delete(1);
break;
case 'b': /* "db", "cb" */
case 'B': /* implemented as B */
if (c == 'b')
vi_back_motion(command);
else
vi_Back_motion(command);
while (sc-- > cursor)
input_delete(1);
break;
case ' ': /* "d ", "c " */
input_delete(1);
break;
case '$': /* "d$", "c$" */
clear_to_eol:
while (cursor < command_len)
input_delete(1);
break;
}
break;
}
case 'p'|vbit:
input_forward();
/* fallthrough */
case 'P'|vbit:
put();
break;
case 'r'|vbit:
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
if (c == 0)
beep();
else {
*(command + cursor) = c;
putchar(c);
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 */
vi_cmdmode = 1;
input_backward(1);
break;
}
#endif
/* escape sequence follows */
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
/* different vt100 emulations */
if (c == '[' || c == 'O') {
vi_case('['|vbit:)
vi_case('O'|vbit:)
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
}
if (c >= '1' && c <= '9') {
unsigned char dummy;
if (safe_read(0, &dummy, 1) < 1)
goto prepare_to_die;
if (dummy != '~')
c = '\0';
}
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 ((state->flags & DO_HISTORY) && state->cur_history > 0) {
get_previous_history();
goto rewrite_line;
}
beep();
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;
#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();
}
break;
default: /* If it's regular input, do the normal thing */
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
/* Control-V -- Add non-printable symbol */
if (c == CTRL('V')) {
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
if (c == 0) {
beep();
break;
}
} else
#endif
#if ENABLE_FEATURE_EDITING_VI
if (vi_cmdmode) /* Don't self-insert */
break;
#endif
if (!Isprint(c)) /* Skip non-printable characters */
break;
if (command_len >= (maxsize - 2)) /* Need to leave space for enter */
break;
command_len++;
if (cursor == (command_len - 1)) { /* Append if at the end of the line */
command[cursor] = c;
command[cursor+1] = '\0';
cmdedit_set_out_char(' ');
} else { /* Insert otherwise */
int sc = cursor;
memmove(command + sc + 1, command + sc, command_len - sc);
command[sc] = c;
sc++;
/* rewrite from cursor */
input_end();
/* to prev x pos + 1 */
input_backward(cursor - sc);
}
break;
}
if (break_out) /* Enter is the command terminator, no more input. */
break;
if (c != '\t')
lastWasTab = FALSE;
}
/* Move to end line. Bonus: rewrite line from cursor */
static void input_end(void)
{
while (cursor < len)
cmdedit_set_out_char(0);
}
int cmdedit_read_input(char *prompt, char command[BUFSIZ])
{
int break_out = 0;
int lastWasTab = FALSE;
unsigned char c;
unsigned int ic;
#if ENABLE_FEATURE_COMMAND_EDITING_VI
unsigned int prevc;
int vi_cmdmode = 0;
#endif
/* prepare before init handlers */
cmdedit_y = 0; /* quasireal y, not true work if line > xt*yt */
len = 0;
command_ps = command;
getTermSettings(0, (void *) &initial_settings);
memcpy(&new_settings, &initial_settings, sizeof(struct termios));
new_settings.c_lflag &= ~ICANON; /* unbuffered input */
/* Turn off echoing and CTRL-C, so we can trap it */
new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
/* Hmm, in linux c_cc[] not parsed if set ~ICANON */
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VTIME] = 0;
/* Turn off CTRL-C, so we can trap it */
# ifndef _POSIX_VDISABLE
# define _POSIX_VDISABLE '\0'
# endif
new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
command[0] = 0;
setTermSettings(0, (void *) &new_settings);
handlers_sets |= SET_RESET_TERM;
/* Now initialize things */
cmdedit_init();
/* Print out the command prompt */
parse_prompt(prompt);
while (1) {
fflush(stdout); /* buffered out to fast */
if (safe_read(0, &c, 1) < 1)
/* if we can't read input then exit */
goto prepare_to_die;
ic = c;
#if ENABLE_FEATURE_COMMAND_EDITING_VI
newdelflag = 1;
if (vi_cmdmode)
ic |= vbit;
#endif
switch (ic) {
case '\n':
case '\r':
vi_case( case '\n'|vbit: )
vi_case( case '\r'|vbit: )
/* Enter */
goto_new_line();
break_out = 1;
break;
case CNTRL('A'):
vi_case( case '0'|vbit: )
/* Control-a -- Beginning of line */
input_backward(cursor);
break;
case CNTRL('B'):
vi_case( case 'h'|vbit: )
vi_case( case '\b'|vbit: )
vi_case( case DEL|vbit: )
/* Control-b -- Move back one character */
input_backward(1);
break;
case CNTRL('C'):
vi_case( case CNTRL('C')|vbit: )
/* Control-c -- stop gathering input */
goto_new_line();
#if !ENABLE_ASH
command[0] = 0;
len = 0;
lastWasTab = FALSE;
put_prompt();
#else
len = 0;
break_out = -1; /* to control traps */
#endif
break;
case CNTRL('D'):
/* Control-d -- Delete one character, or exit
* if the len=0 and no chars to delete */
if (len == 0) {
errno = 0;
prepare_to_die:
#if !ENABLE_ASH
printf("exit");
goto_new_line();
/* cmdedit_reset_term() called in atexit */
exit(EXIT_SUCCESS);
#else
/* to control stopped jobs */
len = break_out = -1;
break;
#endif
} else {
input_delete(0);
}
break;
case CNTRL('E'):
vi_case( case '$'|vbit: )
/* Control-e -- End of line */
input_end();
break;
case CNTRL('F'):
vi_case( case 'l'|vbit: )
vi_case( case ' '|vbit: )
/* Control-f -- Move forward one character */
input_forward();
break;
case '\b':
case DEL:
/* Control-h and DEL */
input_backspace();
break;
case '\t':
#if ENABLE_FEATURE_COMMAND_TAB_COMPLETION
input_tab(&lastWasTab);
#endif
break;
case CNTRL('K'):
/* Control-k -- clear to end of line */
command[cursor] = 0;
len = cursor;
printf("\033[J");
break;
case CNTRL('L'):
vi_case( case CNTRL('L')|vbit: )
/* Control-l -- clear screen */
printf("\033[H");
redraw(0, len - cursor);
break;
#if MAX_HISTORY > 0
case CNTRL('N'):
vi_case( case CNTRL('N')|vbit: )
vi_case( case 'j'|vbit: )
/* Control-n -- Get next command in history */
if (get_next_history())
goto rewrite_line;
break;
case CNTRL('P'):
vi_case( case CNTRL('P')|vbit: )
vi_case( case 'k'|vbit: )
/* Control-p -- Get previous command from history */
if (cur_history > 0) {
get_previous_history();
goto rewrite_line;
} else {
beep();
}
break;
#endif
case CNTRL('U'):
vi_case( case CNTRL('U')|vbit: )
/* Control-U -- Clear line before cursor */
if (cursor) {
strcpy(command, command + cursor);
redraw(cmdedit_y, len -= cursor);
}
break;
case CNTRL('W'):
vi_case( case CNTRL('W')|vbit: )
/* Control-W -- Remove the last word */
while (cursor > 0 && isspace(command[cursor-1]))
input_backspace();
while (cursor > 0 &&!isspace(command[cursor-1]))
input_backspace();
break;
#if ENABLE_FEATURE_COMMAND_EDITING_VI
case 'i'|vbit:
vi_cmdmode = 0;
break;
case 'I'|vbit:
input_backward(cursor);
vi_cmdmode = 0;
break;
case 'a'|vbit:
input_forward();
vi_cmdmode = 0;
break;
case 'A'|vbit:
input_end();
vi_cmdmode = 0;
break;
case 'x'|vbit:
input_delete(1);
break;
case 'X'|vbit:
if (cursor > 0) {
input_backward(1);
input_delete(1);
}
break;
case 'W'|vbit:
vi_Word_motion(command, 1);
break;
case 'w'|vbit:
vi_word_motion(command, 1);
break;
case 'E'|vbit:
vi_End_motion(command);
break;
case 'e'|vbit:
vi_end_motion(command);
break;
case 'B'|vbit:
vi_Back_motion(command);
break;
case 'b'|vbit:
vi_back_motion(command);
break;
case 'C'|vbit:
vi_cmdmode = 0;
/* fall through */
case 'D'|vbit:
goto clear_to_eol;
case 'c'|vbit:
vi_cmdmode = 0;
/* fall through */
case 'd'|vbit: {
int nc, sc;
sc = cursor;
prevc = ic;
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
if (c == (prevc & 0xff)) {
/* "cc", "dd" */
input_backward(cursor);
goto clear_to_eol;
break;
}
switch (c) {
case 'w':
case 'W':
case 'e':
case 'E':
switch (c) {
case 'w': /* "dw", "cw" */
vi_word_motion(command, vi_cmdmode);
break;
case 'W': /* 'dW', 'cW' */
vi_Word_motion(command, vi_cmdmode);
break;
case 'e': /* 'de', 'ce' */
vi_end_motion(command);
input_forward();
break;
case 'E': /* 'dE', 'cE' */
vi_End_motion(command);
input_forward();
break;
}
nc = cursor;
input_backward(cursor - sc);
while (nc-- > cursor)
input_delete(1);
break;
case 'b': /* "db", "cb" */
case 'B': /* implemented as B */
if (c == 'b')
vi_back_motion(command);
else
vi_Back_motion(command);
while (sc-- > cursor)
input_delete(1);
break;
case ' ': /* "d ", "c " */
input_delete(1);
break;
case '$': /* "d$", "c$" */
clear_to_eol:
while (cursor < len)
input_delete(1);
break;
}
break;
}
case 'p'|vbit:
input_forward();
/* fallthrough */
case 'P'|vbit:
put();
break;
case 'r'|vbit:
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
if (c == 0)
beep();
else {
*(command + cursor) = c;
putchar(c);
putchar('\b');
}
break;
#endif /* FEATURE_COMMAND_EDITING_VI */
case ESC:
#if ENABLE_FEATURE_COMMAND_EDITING_VI
if (vi_mode) {
/* ESC: insert mode --> command mode */
vi_cmdmode = 1;
input_backward(1);
break;
}
#endif
/* escape sequence follows */
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
/* different vt100 emulations */
if (c == '[' || c == 'O') {
vi_case( case '['|vbit: )
vi_case( case 'O'|vbit: )
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
}
if (c >= '1' && c <= '9') {
unsigned char dummy;
if (safe_read(0, &dummy, 1) < 1)
goto prepare_to_die;
if (dummy != '~')
c = 0;
}
switch (c) {
#if ENABLE_FEATURE_COMMAND_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 (cur_history > 0) {
get_previous_history();
goto rewrite_line;
} else {
beep();
}
break;
case 'B':
/* Down Arrow -- Get next command in history */
if (!get_next_history())
break;
/* Rewrite the line with the selected history item */
rewrite_line:
/* change command */
len = strlen(strcpy(command, history[cur_history]));
/* redraw and go to eol (bol, in vi */
#if ENABLE_FEATURE_COMMAND_EDITING_VI
redraw(cmdedit_y, vi_mode ? 9999:0);
#else
redraw(cmdedit_y, 0);
#endif
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':
case 'H':
/* <Home> */
input_backward(cursor);
break;
case '4':
case 'F':
/* <End> */
input_end();
break;
default:
c = 0;
beep();
}
break;
default: /* If it's regular input, do the normal thing */
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
/* Control-V -- Add non-printable symbol */
if (c == CNTRL('V')) {
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
if (c == 0) {
beep();
break;
}
} else
#endif
{
#if ENABLE_FEATURE_COMMAND_EDITING_VI
if (vi_cmdmode) /* don't self-insert */
break;
#endif
if (!Isprint(c)) /* Skip non-printable characters */
break;
}
if (len >= (BUFSIZ - 2)) /* Need to leave space for enter */
break;
len++;
if (cursor == (len - 1)) { /* Append if at the end of the line */
*(command + cursor) = c;
*(command + cursor + 1) = 0;
cmdedit_set_out_char(0);
} else { /* Insert otherwise */
int sc = cursor;
memmove(command + sc + 1, command + sc, len - sc);
*(command + sc) = c;
sc++;
/* rewrite from cursor */
input_end();
/* to prev x pos + 1 */
input_backward(cursor - sc);
}
break;
}
if (break_out) /* Enter is the command terminator, no more input. */
break;
if (c != '\t')
lastWasTab = FALSE;
}