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server/telnet: simplify telnet_input function 

running complexity on this file tells that:
NOTE: proc telnet_input in file telnet_server.c line 576
	nesting depth reached level 8
==>	*seriously consider rewriting the procedure*.
Complexity Scores
Score | ln-ct | nc-lns| file-name(line): proc-name
  319     272     226   src/server/telnet_server.c(576): telnet_input
total nc-lns      226

so try to reduce the complexity score of telnet_input function

Change-Id: I64ecb0c54da83c27a343f2a1df99fc8f9484572a
Signed-off-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6440
Tested-by: jenkins
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Tarek BOCHKATI 2021-08-18 18:41:49 +01:00 committed by Oleksij Rempel
parent 9a9e9e2c66
commit 259e400276
1 changed files with 168 additions and 131 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

299
src/server/telnet_server.c
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@ -320,6 +320,32 @@ static void telnet_history_down(struct connection *connection)
telnet_history_go(connection, next_history);
}
static void telnet_history_add(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
/* save only non-blank not repeating lines in the history */
char *prev_line = t_con->history[(t_con->current_history > 0) ?
t_con->current_history - 1 : TELNET_LINE_HISTORY_SIZE-1];
if (*t_con->line && (!prev_line || strcmp(t_con->line, prev_line))) {
/* if the history slot is already taken, free it */
free(t_con->history[t_con->next_history]);
/* add line to history */
t_con->history[t_con->next_history] = strdup(t_con->line);
/* wrap history at TELNET_LINE_HISTORY_SIZE */
t_con->next_history = (t_con->next_history + 1) % TELNET_LINE_HISTORY_SIZE;
/* current history line starts at the new entry */
t_con->current_history = t_con->next_history;
free(t_con->history[t_con->current_history]);
t_con->history[t_con->current_history] = strdup("");
}
}
static int telnet_history_print(struct connection *connection)
{
struct telnet_connection *tc;
@ -423,6 +449,137 @@ static bool telnet_insert(struct connection *connection, const void *data, size_
return true;
}
static void telnet_delete_character(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
if (t_con->line_cursor == 0)
return;
if (t_con->line_cursor != t_con->line_size) {
size_t i;
telnet_write(connection, "\b", 1);
t_con->line_cursor--;
t_con->line_size--;
memmove(t_con->line + t_con->line_cursor,
t_con->line + t_con->line_cursor + 1,
t_con->line_size -
t_con->line_cursor);
telnet_write(connection,
t_con->line + t_con->line_cursor,
t_con->line_size -
t_con->line_cursor);
telnet_write(connection, " \b", 2);
for (i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
} else {
t_con->line_size--;
t_con->line_cursor--;
/* back space: move the 'printer' head one char
* back, overwrite with space, move back again */
telnet_write(connection, "\b \b", 3);
}
}
static void telnet_remove_character(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
if (t_con->line_cursor < t_con->line_size) {
size_t i;
t_con->line_size--;
/* remove char from line buffer */
memmove(t_con->line + t_con->line_cursor,
t_con->line + t_con->line_cursor + 1,
t_con->line_size - t_con->line_cursor);
/* print remainder of buffer */
telnet_write(connection, t_con->line + t_con->line_cursor,
t_con->line_size - t_con->line_cursor);
/* overwrite last char with whitespace */
telnet_write(connection, " \b", 2);
/* move back to cursor position*/
for (i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
}
}
static int telnet_exec_line(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
struct command_context *command_context = connection->cmd_ctx;
int retval;
telnet_write(connection, "\r\n\x00", 3);
if (strcmp(t_con->line, "history") == 0) {
retval = telnet_history_print(connection);
if (retval != ERROR_OK)
return retval;
return ERROR_OK;
}
telnet_history_add(connection);
t_con->line_size = 0;
/* to suppress prompt in log callback during command execution */
t_con->prompt_visible = false;
if (strcmp(t_con->line, "shutdown") == 0)
telnet_save_history(t_con);
retval = command_run_line(command_context, t_con->line);
t_con->line_cursor = 0;
t_con->prompt_visible = true;
if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
return ERROR_SERVER_REMOTE_CLOSED;
/* the prompt is always placed at the line beginning */
telnet_write(connection, "\r", 1);
retval = telnet_prompt(connection);
if (retval == ERROR_SERVER_REMOTE_CLOSED)
return ERROR_SERVER_REMOTE_CLOSED;
return ERROR_OK;
}
static void telnet_cut_line_to_end(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
/* FIXME: currently this function does not save to clipboard */
if (t_con->line_cursor < t_con->line_size) {
/* overwrite with space, until end of line, move back */
for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, " ", 1);
for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
t_con->line[t_con->line_cursor] = '\0';
t_con->line_size = t_con->line_cursor;
}
}
static void telnet_interrupt(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
/* print '^C' at line end, and display a new command prompt */
telnet_move_cursor(connection, t_con->line_size);
telnet_write(connection, "^C\n\r", 4);
t_con->line_cursor = 0;
t_con->line_size = 0;
telnet_prompt(connection);
}
static void telnet_auto_complete(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
@ -591,7 +748,6 @@ static int telnet_input(struct connection *connection)
unsigned char buffer[TELNET_BUFFER_SIZE];
unsigned char *buf_p;
struct telnet_connection *t_con = connection->priv;
struct command_context *command_context = connection->cmd_ctx;
bytes_read = connection_read(connection, buffer, TELNET_BUFFER_SIZE);
@ -630,108 +786,20 @@ static int telnet_input(struct connection *connection)
}
t_con->line[t_con->line_size] = 0;
telnet_write(connection, "\r\n\x00", 3);
if (strcmp(t_con->line, "history") == 0) {
retval = telnet_history_print(connection);
if (retval != ERROR_OK)
return retval;
continue;
}
/* save only non-blank not repeating lines in the history */
char *prev_line = t_con->history[(t_con->current_history > 0) ?
t_con->current_history - 1 : TELNET_LINE_HISTORY_SIZE-1];
if (*t_con->line && (!prev_line ||
strcmp(t_con->line, prev_line))) {
/* if the history slot is already taken, free it */
free(t_con->history[t_con->next_history]);
/* add line to history */
t_con->history[t_con->next_history] = strdup(t_con->line);
/* wrap history at TELNET_LINE_HISTORY_SIZE */
t_con->next_history = (t_con->next_history + 1) %
TELNET_LINE_HISTORY_SIZE;
/* current history line starts at the new entry */
t_con->current_history =
t_con->next_history;
free(t_con->history[t_con->current_history]);
t_con->history[t_con->current_history] = strdup("");
}
t_con->line_size = 0;
/* to suppress prompt in log callback during command execution */
t_con->prompt_visible = false;
if (strcmp(t_con->line, "shutdown") == 0)
telnet_save_history(t_con);
retval = command_run_line(command_context, t_con->line);
t_con->line_cursor = 0;
t_con->prompt_visible = true;
if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
return ERROR_SERVER_REMOTE_CLOSED;
/* the prompt is always * placed at the line beginning */
telnet_write(connection, "\r", 1);
retval = telnet_prompt(connection);
if (retval == ERROR_SERVER_REMOTE_CLOSED)
return ERROR_SERVER_REMOTE_CLOSED;
retval = telnet_exec_line(connection);
if (retval != ERROR_OK)
return retval;
} else if ((*buf_p == 0x7f) || (*buf_p == 0x8)) { /* delete character */
if (t_con->line_cursor > 0) {
if (t_con->line_cursor != t_con->line_size) {
size_t i;
telnet_write(connection, "\b", 1);
t_con->line_cursor--;
t_con->line_size--;
memmove(t_con->line + t_con->line_cursor,
t_con->line + t_con->line_cursor + 1,
t_con->line_size -
t_con->line_cursor);
telnet_write(connection,
t_con->line + t_con->line_cursor,
t_con->line_size -
t_con->line_cursor);
telnet_write(connection, " \b", 2);
for (i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
} else {
t_con->line_size--;
t_con->line_cursor--;
/* back space: move the 'printer' head one char
* back, overwrite with space, move back again */
telnet_write(connection, "\b \b", 3);
}
}
telnet_delete_character(connection);
} else if (*buf_p == 0x15) { /* clear line */
telnet_clear_line(connection, t_con);
} else if (*buf_p == CTRL('B')) { /* cursor left */
if (t_con->line_cursor > 0) {
telnet_write(connection, "\b", 1);
t_con->line_cursor--;
}
telnet_move_cursor(connection, t_con->line_cursor - 1);
t_con->state = TELNET_STATE_DATA;
} else if (*buf_p == CTRL('C')) { /* interrupt */
/* print '^C' at line end, and display a new command prompt */
telnet_move_cursor(connection, t_con->line_size);
telnet_write(connection, "^C\n\r", 4);
t_con->line_cursor = 0;
t_con->line_size = 0;
telnet_prompt(connection);
telnet_interrupt(connection);
} else if (*buf_p == CTRL('F')) { /* cursor right */
if (t_con->line_cursor < t_con->line_size)
telnet_write(connection, t_con->line + t_con->line_cursor++, 1);
telnet_move_cursor(connection, t_con->line_cursor + 1);
t_con->state = TELNET_STATE_DATA;
} else if (*buf_p == CTRL('P')) { /* cursor up */
telnet_history_up(connection);
@ -742,15 +810,7 @@ static int telnet_input(struct connection *connection)
} else if (*buf_p == CTRL('E')) { /* move the cursor to the end of the line */
telnet_move_cursor(connection, t_con->line_size);
} else if (*buf_p == CTRL('K')) { /* kill line to end */
if (t_con->line_cursor < t_con->line_size) {
/* overwrite with space, until end of line, move back */
for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, " ", 1);
for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
t_con->line[t_con->line_cursor] = '\0';
t_con->line_size = t_con->line_cursor;
}
telnet_cut_line_to_end(connection);
} else if (*buf_p == '\t') {
telnet_auto_complete(connection);
} else {
@ -788,15 +848,10 @@ static int telnet_input(struct connection *connection)
case TELNET_STATE_ESCAPE:
if (t_con->last_escape == '[') {
if (*buf_p == 'D') { /* cursor left */
if (t_con->line_cursor > 0) {
telnet_write(connection, "\b", 1);
t_con->line_cursor--;
}
telnet_move_cursor(connection, t_con->line_cursor - 1);
t_con->state = TELNET_STATE_DATA;
} else if (*buf_p == 'C') { /* cursor right */
if (t_con->line_cursor < t_con->line_size)
telnet_write(connection,
t_con->line + t_con->line_cursor++, 1);
telnet_move_cursor(connection, t_con->line_cursor + 1);
t_con->state = TELNET_STATE_DATA;
} else if (*buf_p == 'A') { /* cursor up */
telnet_history_up(connection);
@ -816,25 +871,7 @@ static int telnet_input(struct connection *connection)
} else if (t_con->last_escape == '3') {
/* Remove character */
if (*buf_p == '~') {
if (t_con->line_cursor < t_con->line_size) {
size_t i;
t_con->line_size--;
/* remove char from line buffer */
memmove(t_con->line + t_con->line_cursor,
t_con->line + t_con->line_cursor + 1,
t_con->line_size - t_con->line_cursor);
/* print remainder of buffer */
telnet_write(connection, t_con->line + t_con->line_cursor,
t_con->line_size - t_con->line_cursor);
/* overwrite last char with whitespace */
telnet_write(connection, " \b", 2);
/* move back to cursor position*/
for (i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
}
telnet_remove_character(connection);
t_con->state = TELNET_STATE_DATA;
} else
t_con->state = TELNET_STATE_DATA;