/*
this function displays the current
history entry
*/
void _el_display_history()
{
int line_len;
int h_len;
_el_set_cursor(-rl_point);
if ((!(_el_hs.entries)) || (!_el_mb2w
(_el_hs.entries[_el_hs.offset]->line, &_el_wide))) {
return;
}
h_len = (int)wcslen(_el_wide);
line_len = (int)wcslen(_el_line_buffer);
if (h_len > (_EL_BUF_LEN - 1)) {
h_len = _EL_BUF_LEN - 1;
_el_wide[_EL_BUF_LEN - 1] = '\0';
}
wcscpy_s(_el_line_buffer, _el_line_buffer_size, _el_wide);
wcscpy_s(_el_print, _el_line_buffer_size, _el_wide);
wcscpy_s(_el_line_buffer, _el_line_buffer_size, _el_wide);
rl_point = (int)h_len;
if (h_len < line_len) {
_el_add_char(_el_print, _T(' '), line_len - h_len);
}
_el_print_string(_el_print);
_el_set_cursor(h_len);
}
/*
this function copies the "filename" string to "name"
if filename is a NULL pointer, %APPDATA%\.history
is copied to "name"
*/
int _el_find_history_file(const char *filename, wchar_t **name)
{
wchar_t *appdata = NULL;
size_t n;
if (!filename) {
_wgetenv_s(&n, NULL, 0, _T("APPDATA"));
if (n) {
if ((appdata = malloc((n + 1) * sizeof(wchar_t)))) {
_wgetenv_s(&n, appdata, n, _T("APPDATA"));
}
else {
n = 0;
}
}
if (n) {
n = (wcslen(appdata) + _EL_ENV_BUF_LEN);
if (!(*name = malloc(n * sizeof(wchar_t)))) {
return -1;
}
swprintf_s(*name, n, _T("%s\\"), appdata);
}
wcscat_s(*name, n, _T(".history"));
}
else {
if (!_el_mb2w((char *)filename, name)) {
return -1;
}
}
if (appdata) {
free(appdata);
}
return 0;
}
/*
main readline function
*/
char *readline(const char *prompt)
{
wchar_t buf[_EL_CONSOLE_BUF_LEN];
char **array = NULL;
char *ret_string = NULL;
int start = 0;
int end = 0;
int compl_pos = -1;
int n = 0;
int index = 0;
int len = 0;
int line_len = 0;
int old_width = 0;
int width = 0;
UINT32 ctrl = 0;
UINT32 special = 0;
COORD coord;
DWORD count = 0;
INPUT_RECORD irBuffer;
CONSOLE_SCREEN_BUFFER_INFO sbInfo;
static int piped_input_finished = FALSE;
if (piped_input_finished) {
return NULL;
}
_el_ctrl_c_pressed = FALSE;
_el_line_buffer = NULL;
_el_temp_print = NULL;
_el_next_compl = NULL;
rl_line_buffer = NULL;
_el_file_name = NULL;
_el_dir_name = NULL;
_el_old_arg = NULL;
_el_wide = NULL;
_el_text = NULL;
_el_text_mb = NULL;
_el_compl_array = NULL;
_el_completer_word_break_characters = NULL;
rl_point = 0;
rl_attempted_completion_over = 0;
_el_compl_index = 0;
_el_n_compl = 0;
_el_h_in = NULL;
_el_h_out = NULL;
wcscpy_s(_el_basic_file_break_characters,
_EL_MAX_FILE_BREAK_CHARACTERS, _EL_BASIC_FILE_BREAK_CHARACTERS);
memset(&coord, 0, sizeof(COORD));
memset(buf, 0, _EL_CONSOLE_BUF_LEN * sizeof(wchar_t));
memset(&irBuffer, 0, sizeof(INPUT_RECORD));
/*
allocate buffers
*/
_el_line_buffer_size = _EL_BUF_LEN + 1;
_el_line_buffer = (wchar_t *)malloc(_el_line_buffer_size * sizeof(wchar_t));
if (!_el_mb2w((char *)rl_basic_word_break_characters,
&_el_basic_word_break_characters)) {
_el_clean_exit();
return NULL;
}
if (rl_completer_word_break_characters) {
if (!_el_mb2w((char *)rl_completer_word_break_characters,
&_el_completer_word_break_characters)) {
_el_clean_exit();
return NULL;
}
}
if (!(_el_line_buffer)) {
_el_clean_exit();
return NULL;
}
memset(_el_line_buffer, 0, _el_line_buffer_size * sizeof(wchar_t));
rl_attempted_completion_over = 0;
_el_print = (wchar_t *)malloc(_el_line_buffer_size * sizeof(wchar_t));
if (!(_el_print)) {
_el_clean_exit();
return NULL;
}
memset(_el_print, 0, _el_line_buffer_size * sizeof(wchar_t));
rl_prompt = _strdup(prompt);
if (!(rl_prompt)) {
_el_clean_exit();
return NULL;
}
if (!_el_mb2w((char *)prompt, &_el_prompt)) {
_el_clean_exit();
return NULL;
}
_el_prompt_len = (int)wcslen(_el_prompt);
/*
get I/O handles for current console
*/
_el_h_in = GetStdHandle(STD_INPUT_HANDLE);
_el_h_out = GetStdHandle(STD_OUTPUT_HANDLE);
if ((!(_el_h_in)) || (!(_el_h_out))) {
_el_clean_exit();
return NULL;
}
/*
set console modes
*/
_el_prev_in_cm_saved = GetConsoleMode(_el_h_in, &_el_prev_in_cm);
_el_prev_out_cm_saved = GetConsoleMode(_el_h_out, &_el_prev_out_cm);
SetConsoleMode(_el_h_in, ENABLE_PROCESSED_INPUT
| ENABLE_EXTENDED_FLAGS | ENABLE_INSERT_MODE
| ENABLE_QUICK_EDIT_MODE);
SetConsoleMode(_el_h_out, ENABLE_PROCESSED_OUTPUT);
SetConsoleCtrlHandler((PHANDLER_ROUTINE)
_el_signal_handler, TRUE);
rl_point = 0;
while ((buf[0] != VK_RETURN)
&& (!_el_ctrl_c_pressed) && _el_line_buffer) {
/*
get screen buffer info from the current console
*/
if (!GetConsoleScreenBufferInfo(_el_h_out, &sbInfo)) {
_el_clean_exit();
return NULL;
}
_el_temp_print_size = sbInfo.dwSize.X + 1;
if (!(_el_temp_print = realloc(_el_temp_print,
_el_temp_print_size * sizeof(wchar_t)))) {
_el_clean_exit();
return NULL;
}
_el_temp_print[0] = _T('\0');
/*
compute the current visible console width
*/
width = sbInfo.srWindow.Right - sbInfo.srWindow.Left + 1;
/*
if the user has changed the window size
update the view
*/
if (old_width != width) {
line_len = (int)wcslen(_el_line_buffer);
sbInfo.dwCursorPosition.X = 0;
if (old_width) {
n = (_el_prompt_len + line_len - 1) / old_width;
sbInfo.dwCursorPosition.Y -= n;
coord.Y = sbInfo.dwCursorPosition.Y;
}
if (!SetConsoleCursorPosition(_el_h_out,
sbInfo.dwCursorPosition)) {
_el_clean_exit();
return NULL;
}
if (_el_print_string(_el_prompt)) {
_el_clean_exit();
return NULL;
}
if (_el_set_cursor(_el_prompt_len)) {
_el_clean_exit();
return NULL;
}
if (_el_print_string(_el_line_buffer)) {
_el_clean_exit();
return NULL;
}
if (_el_set_cursor(line_len)) {
_el_clean_exit();
return NULL;
}
if (old_width && (old_width < width)) {
coord.X = 0;
coord.Y += (_el_prompt_len + line_len - 1) / width + 1;
FillConsoleOutputCharacter(_el_h_out, _T(' '),
sbInfo.dwSize.X * (n + 2), coord, &count);
}
}
old_width = width;
/*
wait for console events
*/
if (!PeekConsoleInput(_el_h_in, &irBuffer, 1, &count)) {
/* Check we're possibly piped from another program. */
BOOL ret;
char *pos, buf[8192];
DWORD to_read = sizeof(buf);
/* Can't guarantee Unicode here, we don't control the data passed through the pipe. */
pos = buf;
memset(pos, 0, sizeof(buf));
do {
ret = ReadFile(_el_h_in, pos, to_read, &count, 0);
pos += count;
to_read -= count;
} while (ret && to_read > 0);
if (pos == buf) {
_el_clean_exit();
return NULL;
} else if (to_read > 0) {
/* Tried to fill the buf, but there's nothing anymore. Force finish. */
piped_input_finished = TRUE;
}
buf[pos - buf] = '\0';
ret_string = _strdup(buf);
_el_clean_exit();
return ret_string;
}
if (count) {
if ((irBuffer.EventType == KEY_EVENT) && irBuffer.Event.KeyEvent.bKeyDown) {
/*
the user pressed a key
*/
ctrl = (irBuffer.Event.KeyEvent.dwControlKeyState
& (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED));
if (irBuffer.Event.KeyEvent.uChar.UnicodeChar == _T('\n')) {
if (!ReadConsoleInput(_el_h_in, &irBuffer, 1, &count)) {
_el_clean_exit();
return NULL;
}
buf[0] = VK_RETURN;
continue;
}
if (irBuffer.Event.KeyEvent.uChar.UnicodeChar == _T('\0')) {
/*
if it is a special key, just remove it from the buffer
*/
if (!ReadConsoleInput(_el_h_in, &irBuffer, 1, &count)) {
_el_clean_exit();
return NULL;
}
special = irBuffer.Event.KeyEvent.wVirtualKeyCode;
/*
parse the special key
*/
switch (special) {
/*
arrow left, arrow right
HOME and END keys
*/
case VK_LEFT:
case VK_RIGHT:
case VK_HOME:
case VK_END:
if (_el_move_cursor(special, ctrl)) {
_el_clean_exit();
return NULL;
}
break;
/*
arrow up: display previous history element (if any)
after recording the current command line
*/
case VK_UP:
if (_el_display_prev_hist()) {
_el_clean_exit();
return NULL;
}
break;
/*
page up: display the first history element (if any)
after recording the current command line
*/
case VK_PRIOR:
if (_el_display_first_hist()) {
_el_clean_exit();
return NULL;
}
break;
/*
arrow down: display next history element (if any)
after recording the current command line
*/
case VK_DOWN:
if (_el_display_next_hist()) {
_el_clean_exit();
return NULL;
}
break;
case VK_NEXT:
/*
page down: display last history element (if any)
after recording the current command line
*/
if (_el_display_last_hist()) {
_el_clean_exit();
return NULL;
}
break;
/*
delete char
*/
case VK_DELETE:
if (rl_point != wcslen(_el_line_buffer)) {
if (_el_delete_char(VK_DELETE, 1)) {
_el_clean_exit();
return NULL;
}
_el_compl_index = 0;
compl_pos = -1;
}
break;
}
}
else {
/*
if it is a normal key, remove it from the buffer
*/
memset(buf, 0, _EL_CONSOLE_BUF_LEN * sizeof(wchar_t));
if (!ReadConsole(_el_h_in, buf, 1, &count, NULL)) {
_el_clean_exit();
return NULL;
}
/*
then parse it
*/
switch (buf[0]) {
/*
backspace
*/
case VK_BACK:
if (rl_point) {
_el_compl_index = 0;
compl_pos = -1;
if (_el_delete_char(VK_BACK, 1)) {
_el_clean_exit();
return NULL;
}
}
break;
/*
TAB: do completion
*/
case VK_TAB:
if ((!array) || (rl_point != compl_pos)) {
_el_free_array(array);
index = 0;
if (_el_text) {
free(_el_text);
_el_text = NULL;
}
if (!(_el_text = _el_get_compl_text(&start, &end))) {
_el_clean_exit();
return NULL;
}
if (_el_old_arg) {
_el_old_arg[0] = _T('\0');
}
if (!_el_w2mb(_el_text, &_el_text_mb)) {
_el_clean_exit();
return NULL;
}
if (!_el_w2mb(_el_line_buffer, &rl_line_buffer)) {
_el_clean_exit();
return NULL;
}
array = (rl_attempted_completion_function
? rl_attempted_completion_function(_el_text_mb, start, end)
: rl_completion_matches(_el_text_mb, (rl_completion_entry_function
? rl_completion_entry_function : rl_filename_completion_function)));
if (!array) {
_el_clean_exit();
return NULL;
}
}
if (!array[index]) {
index = 0;
}
if (array[index]) {
if (!_el_mb2w(array[index], &_el_next_compl)) {
_el_clean_exit();
return NULL;
}
len = 0;
if (_el_old_arg) {
len = (int)wcslen(_el_old_arg);
#if 0
fwprintf(stderr, _T("VK_TAB) _el_old_arg = '%s', len = %d\n"), _el_old_arg, len);
fflush(stderr);
#endif
}
if (!len) {
len = (int)wcslen(_el_text);
}
if (len) {
if (_el_delete_char(VK_BACK, len)) {
_el_clean_exit();
return NULL;
}
}
len = (int)wcslen(_el_next_compl);
if (!(_el_old_arg = realloc(_el_old_arg,
(len + 1) * sizeof(wchar_t)))) {
return NULL;
}
_el_old_arg[len] = _T('\0');
memcpy(_el_old_arg, _el_next_compl, len * sizeof(wchar_t));
line_len = (int)wcslen(_el_line_buffer);
if (_el_insert_char(_el_next_compl, len)) {
_el_clean_exit();
return NULL;
}
free(_el_next_compl);
_el_next_compl = NULL;
compl_pos = ((rl_point && (!wcschr(_el_completer_word_break_characters
? _el_completer_word_break_characters : _el_basic_word_break_characters,
_el_line_buffer[rl_point - 1]))) ? rl_point : -1);
++index;
}
break;
/*
ENTER: move the cursor to end of line,
then return to the caller program
*/
case VK_RETURN:
if (_el_set_cursor((int)wcslen(_el_line_buffer) - rl_point)) {
_el_clean_exit();
return NULL;
}
break;
/*
delete word
*/
case 0x17: /* CTRL + W */
if (ctrl) {
if (!rl_point) {
break;
}
n = 1;
while (((rl_point - n) > 0)
&& (iswspace(_el_line_buffer[rl_point - n]))) {
++n;
}
while ((rl_point - n)
&& (!iswspace(_el_line_buffer[rl_point - n]))) {
++n;
}
if (rl_point - n) {
--n;
}
_el_compl_index = 0;
compl_pos = -1;
if (_el_delete_char(VK_BACK, n)) {
_el_clean_exit();
return NULL;
}
break;
}
/*
delete until end of line
*/
case 0x0B: /* CTRL + K */
if (ctrl) {
line_len = (int)wcslen(_el_line_buffer);
if (rl_point < line_len) {
_el_compl_index = 0;
compl_pos = -1;
if (_el_delete_char(VK_DELETE, line_len - rl_point)) {
_el_clean_exit();
return NULL;
}
}
break;
}
/*
beginning-of-line
*/
case 0x01: /* CTRL + A */
if (_el_move_cursor(VK_HOME, 0)) {
_el_clean_exit();
return NULL;
}
break;
/*
end-of-line
*/
case 0x05: /* CTRL + E */
if (_el_move_cursor(VK_END, 0)) {
_el_clean_exit();
return NULL;
}
break;
/*
forward-char
*/
case 0x06: /* CTRL + F */
if (_el_move_cursor(VK_RIGHT, 0)) {
_el_clean_exit();
return NULL;
}
break;
/*
backward-char
*/
case 0x02: /* CTRL + B */
if (_el_move_cursor(VK_LEFT, 0)) {
_el_clean_exit();
return NULL;
}
break;
/*
previous-line
*/
case 0x10: /* CTRL + P */
if (_el_display_prev_hist()) {
_el_clean_exit();
return NULL;
}
break;
/*
next-line
*/
case 0x0E: /* CTRL + N */
if (_el_display_next_hist()) {
_el_clean_exit();
return NULL;
}
break;
/*
delete char
*/
case 0x04: /* CTRL + D */
if (rl_point != wcslen(_el_line_buffer)) {
if (_el_delete_char(VK_DELETE, 1)) {
_el_clean_exit();
return NULL;
}
_el_compl_index = 0;
compl_pos = -1;
}
break;
/*
if it is a printable character, print it
NOTE: I have later commented out the
iswprint() check since for instance it
prevents the euro sign from being printed
*/
default:
/*if (iswprint(buf[0])) {*/
_el_compl_index = 0;
compl_pos = -1;
if (_el_insert_char(buf, 1)) {
_el_clean_exit();
return NULL;
}
/*}*/
}
}
}
/*
if it was not a keyboard event, just remove it from buffer
*/
else if (!ReadConsoleInput(_el_h_in, &irBuffer, 1, &count)) {
_el_clean_exit();
return NULL;
}
}
else {
/*
wait for console input
*/
WaitForSingleObject(_el_h_in, INFINITE);
}
}
printf("\n");
history_set_pos(history_length());
/*
if CTRL+C has been pressed, return an empty string
*/
if (_el_line_buffer) {
if (_el_ctrl_c_pressed) {
n = (int)wcslen(_el_line_buffer) - rl_point;
if (n) {
_el_set_cursor(n);
}
_el_line_buffer[0] = _T('\0');
}
_el_w2mb(_el_line_buffer, &rl_line_buffer);
ret_string = _strdup(rl_line_buffer);
}
_el_clean_exit();
return ret_string;
}