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- /*
- * tinyrl.c
- */
- /* make sure we can get fileno() */
- #undef __STRICT_ANSI__
- /* LIBC HEADERS */
- #include <assert.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <ctype.h>
- /* POSIX HEADERS */
- #include <unistd.h>
- #include "lub/string.h"
- #include "private.h"
- /*-------------------------------------------------------- */
- static void utf8_point_left(tinyrl_t * this)
- {
- if (this->utf8) {
- while (this->point &&
- (UTF8_10 == (this->line[this->point] & UTF8_MASK)))
- this->point--;
- }
- }
- /*-------------------------------------------------------- */
- static void utf8_point_right(tinyrl_t * this)
- {
- if (this->utf8) {
- while ((this->point < this->end) &&
- (UTF8_10 == (this->line[this->point] & UTF8_MASK)))
- this->point++;
- }
- }
- /*-------------------------------------------------------- */
- static unsigned utf8_nsyms(tinyrl_t * this, const char *str, unsigned num)
- {
- unsigned nsym = 0;
- unsigned i;
- if (!this->utf8)
- return num;
- for (i = 0; i < num; i++) {
- if ('\0' == str[i])
- break;
- if (UTF8_10 == (str[i] & UTF8_MASK))
- continue;
- nsym++;
- }
- return nsym;
- }
- /*----------------------------------------------------------------------- */
- static void tty_set_raw_mode(tinyrl_t * this)
- {
- struct termios new_termios;
- int fd = fileno(tinyrl_vt100__get_istream(this->term));
- int status;
- status = tcgetattr(fd, &this->default_termios);
- if (-1 != status) {
- status = tcgetattr(fd, &new_termios);
- assert(-1 != status);
- new_termios.c_iflag = 0;
- new_termios.c_oflag = OPOST | ONLCR;
- new_termios.c_lflag = 0;
- new_termios.c_cc[VMIN] = 1;
- new_termios.c_cc[VTIME] = 0;
- /* Do the mode switch */
- status = tcsetattr(fd, TCSAFLUSH, &new_termios);
- assert(-1 != status);
- }
- }
- /*----------------------------------------------------------------------- */
- static void tty_restore_mode(const tinyrl_t * this)
- {
- int fd = fileno(tinyrl_vt100__get_istream(this->term));
- /* Do the mode switch */
- (void)tcsetattr(fd, TCSAFLUSH, &this->default_termios);
- }
- /*----------------------------------------------------------------------- */
- /*
- This is called whenever a line is edited in any way.
- It signals that if we are currently viewing a history line we should transfer it
- to the current buffer
- */
- static void changed_line(tinyrl_t * this)
- {
- /* if the current line is not our buffer then make it so */
- if (this->line != this->buffer) {
- /* replace the current buffer with the new details */
- free(this->buffer);
- this->line = this->buffer = lub_string_dup(this->line);
- this->buffer_size = strlen(this->buffer);
- assert(this->line);
- }
- }
- /*----------------------------------------------------------------------- */
- static bool_t tinyrl_key_default(tinyrl_t * this, int key)
- {
- bool_t result = BOOL_FALSE;
- if (key > 31) {
- char tmp[2];
- tmp[0] = (key & 0xFF), tmp[1] = '\0';
- /* inject this text into the buffer */
- result = tinyrl_insert_text(this, tmp);
- } else {
- char tmp[10];
- sprintf(tmp, "~%d", key);
- /* inject control characters as ~N where N is the ASCII code */
- result = tinyrl_insert_text(this, tmp);
- }
- return result;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_interrupt(tinyrl_t * this, int key)
- {
- tinyrl_delete_text(this, 0, this->end);
- this->done = BOOL_TRUE;
- /* keep the compiler happy */
- key = key;
- return BOOL_TRUE;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_start_of_line(tinyrl_t * this, int key)
- {
- /* set the insertion point to the start of the line */
- this->point = 0;
- /* keep the compiler happy */
- key = key;
- return BOOL_TRUE;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_end_of_line(tinyrl_t * this, int key)
- {
- /* set the insertion point to the end of the line */
- this->point = this->end;
- /* keep the compiler happy */
- key = key;
- return BOOL_TRUE;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_kill(tinyrl_t * this, int key)
- {
- /* release any old kill string */
- lub_string_free(this->kill_string);
- /* store the killed string */
- this->kill_string = lub_string_dup(&this->buffer[this->point]);
- /* delete the text to the end of the line */
- tinyrl_delete_text(this, this->point, this->end);
- /* keep the compiler happy */
- key = key;
- return BOOL_TRUE;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_yank(tinyrl_t * this, int key)
- {
- bool_t result = BOOL_FALSE;
- if (this->kill_string) {
- /* insert the kill string at the current insertion point */
- result = tinyrl_insert_text(this, this->kill_string);
- }
- /* keep the compiler happy */
- key = key;
- return result;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_crlf(tinyrl_t * this, int key)
- {
- tinyrl_crlf(this);
- this->done = BOOL_TRUE;
- /* keep the compiler happy */
- key = key;
- return BOOL_TRUE;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_up(tinyrl_t * this, int key)
- {
- bool_t result = BOOL_FALSE;
- tinyrl_history_entry_t *entry = NULL;
- if (this->line == this->buffer) {
- /* go to the last history entry */
- entry = tinyrl_history_getlast(this->history, &this->hist_iter);
- } else {
- /* already traversing the history list so get previous */
- entry = tinyrl_history_getprevious(&this->hist_iter);
- }
- if (NULL != entry) {
- /* display the entry moving the insertion point
- * to the end of the line
- */
- this->line = tinyrl_history_entry__get_line(entry);
- this->point = this->end = strlen(this->line);
- result = BOOL_TRUE;
- }
- /* keep the compiler happy */
- key = key;
- return result;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_down(tinyrl_t * this, int key)
- {
- bool_t result = BOOL_FALSE;
- if (this->line != this->buffer) {
- /* we are not already at the bottom */
- /* the iterator will have been set up by the key_up() function */
- tinyrl_history_entry_t *entry =
- tinyrl_history_getnext(&this->hist_iter);
- if (NULL == entry) {
- /* nothing more in the history list */
- this->line = this->buffer;
- } else {
- this->line = tinyrl_history_entry__get_line(entry);
- }
- /* display the entry moving the insertion point
- * to the end of the line
- */
- this->point = this->end = strlen(this->line);
- result = BOOL_TRUE;
- }
- /* keep the compiler happy */
- key = key;
- return result;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_left(tinyrl_t * this, int key)
- {
- bool_t result = BOOL_FALSE;
- if (this->point > 0) {
- this->point--;
- utf8_point_left(this);
- result = BOOL_TRUE;
- }
- /* keep the compiler happy */
- key = key;
- return result;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_right(tinyrl_t * this, int key)
- {
- bool_t result = BOOL_FALSE;
- if (this->point < this->end) {
- this->point++;
- utf8_point_right(this);
- result = BOOL_TRUE;
- }
- /* keep the compiler happy */
- key = key;
- return result;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_backspace(tinyrl_t * this, int key)
- {
- bool_t result = BOOL_FALSE;
- if (this->point) {
- unsigned end = --this->point;
- utf8_point_left(this);
- tinyrl_delete_text(this, this->point, end);
- result = BOOL_TRUE;
- }
- /* keep the compiler happy */
- key = key;
- return result;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_delete(tinyrl_t * this, int key)
- {
- bool_t result = BOOL_FALSE;
- if (this->point < this->end) {
- unsigned end = this->point;
- utf8_point_left(this);
- tinyrl_delete_text(this, this->point, end);
- result = BOOL_TRUE;
- }
- /* keep the compiler happy */
- key = key;
- return result;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_clear_screen(tinyrl_t * this, int key)
- {
- tinyrl_vt100_clear_screen(this->term);
- tinyrl_vt100_cursor_home(this->term);
- tinyrl_reset_line_state(this);
- /* keep the compiler happy */
- key = key;
- this = this;
- return BOOL_TRUE;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_erase_line(tinyrl_t * this, int key)
- {
- tinyrl_delete_text(this, 0, this->point);
- this->point = 0;
- /* keep the compiler happy */
- key = key;
- this = this;
- return BOOL_TRUE;
- }/*-------------------------------------------------------- */
- static bool_t tinyrl_key_escape(tinyrl_t * this, int key)
- {
- bool_t result = BOOL_FALSE;
- switch (tinyrl_vt100_escape_decode(this->term)) {
- case tinyrl_vt100_CURSOR_UP:
- result = tinyrl_key_up(this, key);
- break;
- case tinyrl_vt100_CURSOR_DOWN:
- result = tinyrl_key_down(this, key);
- break;
- case tinyrl_vt100_CURSOR_LEFT:
- result = tinyrl_key_left(this, key);
- break;
- case tinyrl_vt100_CURSOR_RIGHT:
- result = tinyrl_key_right(this, key);
- break;
- case tinyrl_vt100_UNKNOWN:
- break;
- }
- return result;
- }
- /*-------------------------------------------------------- */
- static bool_t tinyrl_key_tab(tinyrl_t * this, int key)
- {
- bool_t result = BOOL_FALSE;
- tinyrl_match_e status = tinyrl_complete_with_extensions(this);
- switch (status) {
- case TINYRL_COMPLETED_MATCH:
- case TINYRL_MATCH:
- {
- /* everything is OK with the world... */
- result = tinyrl_insert_text(this, " ");
- break;
- }
- case TINYRL_NO_MATCH:
- case TINYRL_MATCH_WITH_EXTENSIONS:
- case TINYRL_AMBIGUOUS:
- case TINYRL_COMPLETED_AMBIGUOUS:
- {
- /* oops don't change the result and let the bell ring */
- break;
- }
- }
- /* keep the compiler happy */
- key = key;
- return result;
- }
- /*-------------------------------------------------------- */
- static void tinyrl_fini(tinyrl_t * this)
- {
- /* delete the history session */
- tinyrl_history_delete(this->history);
- /* delete the terminal session */
- tinyrl_vt100_delete(this->term);
- /* free up any dynamic strings */
- lub_string_free(this->buffer);
- this->buffer = NULL;
- lub_string_free(this->kill_string);
- this->kill_string = NULL;
- lub_string_free(this->last_buffer);
- this->last_buffer = NULL;
- }
- /*-------------------------------------------------------- */
- static void
- tinyrl_init(tinyrl_t * this,
- FILE * instream,
- FILE * outstream,
- unsigned stifle, tinyrl_completion_func_t * complete_fn)
- {
- int i;
- for (i = 0; i < NUM_HANDLERS; i++) {
- this->handlers[i] = tinyrl_key_default;
- }
- /* default handlers */
- this->handlers[KEY_CR] = tinyrl_key_crlf;
- this->handlers[KEY_LF] = tinyrl_key_crlf;
- this->handlers[KEY_ETX] = tinyrl_key_interrupt;
- this->handlers[KEY_DEL] = tinyrl_key_backspace;
- this->handlers[KEY_BS] = tinyrl_key_backspace;
- this->handlers[KEY_EOT] = tinyrl_key_delete;
- this->handlers[KEY_ESC] = tinyrl_key_escape;
- this->handlers[KEY_FF] = tinyrl_key_clear_screen;
- this->handlers[KEY_NAK] = tinyrl_key_erase_line;
- this->handlers[KEY_SOH] = tinyrl_key_start_of_line;
- this->handlers[KEY_ENQ] = tinyrl_key_end_of_line;
- this->handlers[KEY_VT] = tinyrl_key_kill;
- this->handlers[KEY_EM] = tinyrl_key_yank;
- this->handlers[KEY_HT] = tinyrl_key_tab;
- this->line = NULL;
- this->max_line_length = 0;
- this->prompt = NULL;
- this->prompt_size = 0;
- this->buffer = NULL;
- this->buffer_size = 0;
- this->done = BOOL_FALSE;
- this->completion_over = BOOL_FALSE;
- this->point = 0;
- this->end = 0;
- this->attempted_completion_function = complete_fn;
- this->state = 0;
- this->kill_string = NULL;
- this->echo_char = '\0';
- this->echo_enabled = BOOL_TRUE;
- if (instream)
- this->isatty =
- isatty(fileno(instream)) ? BOOL_TRUE : BOOL_FALSE;
- else
- this->isatty = BOOL_FALSE;
- this->last_buffer = NULL;
- this->last_point = 0;
- this->utf8 = BOOL_FALSE;
- /* create the vt100 terminal */
- this->term = tinyrl_vt100_new(instream, outstream);
- /* create the history */
- this->history = tinyrl_history_new(stifle);
- }
- /*-------------------------------------------------------- */
- int tinyrl_printf(const tinyrl_t * this, const char *fmt, ...)
- {
- va_list args;
- int len;
- va_start(args, fmt);
- len = tinyrl_vt100_vprintf(this->term, fmt, args);
- va_end(args);
- return len;
- }
- /*-------------------------------------------------------- */
- void tinyrl_delete(tinyrl_t * this)
- {
- assert(this);
- if (this) {
- /* let the object tidy itself up */
- tinyrl_fini(this);
- /* release the memory associate with this instance */
- free(this);
- }
- }
- /*-------------------------------------------------------- */
- /*#####################################
- * EXPORTED INTERFACE
- *##################################### */
- /*----------------------------------------------------------------------- */
- int tinyrl_getchar(const tinyrl_t * this)
- {
- return tinyrl_vt100_getchar(this->term);
- }
- /*----------------------------------------------------------------------- */
- static void tinyrl_internal_print(const tinyrl_t * this, const char *text)
- {
- if (BOOL_TRUE == this->echo_enabled) {
- /* simply echo the line */
- tinyrl_vt100_printf(this->term, "%s", text);
- } else {
- /* replace the line with echo char if defined */
- if (this->echo_char) {
- unsigned i = strlen(text);
- while (i--) {
- tinyrl_vt100_printf(this->term, "%c",
- this->echo_char);
- }
- }
- }
- }
- /*----------------------------------------------------------------------- */
- void tinyrl_redisplay(tinyrl_t * this)
- {
- int delta;
- unsigned line_len, last_line_len, count;
- line_len = strlen(this->line);
- last_line_len = (this->last_buffer ? strlen(this->last_buffer) : 0);
- do {
- if (this->last_buffer) {
- delta = (int)(line_len - last_line_len);
- if (delta > 0) {
- count = (unsigned)delta;
- /* is the current line simply an extension of the previous one? */
- if (0 ==
- strncmp(this->line, this->last_buffer,
- last_line_len)) {
- /* output the line accounting for the echo behaviour */
- tinyrl_internal_print(this,
- &this->
- line[line_len -
- count]);
- break;
- }
- } else if (delta < 0) {
- /* is the current line simply a deletion of some characters from the end? */
- if (0 ==
- strncmp(this->line, this->last_buffer,
- line_len)) {
- if (this->echo_enabled
- || this->echo_char) {
- int shift =
- (int)(this->last_point -
- this->point);
- /* just get the terminal to delete the characters */
- if (shift > 0) {
- count = utf8_nsyms(this,
- this->last_buffer + this->point,
- (unsigned)shift);
- /* we've moved the cursor backwards */
- tinyrl_vt100_cursor_back
- (this->term, count);
- } else if (shift < 0) {
- count = utf8_nsyms(this,
- this->last_buffer + this->last_point,
- (unsigned)-shift);
- /* we've moved the cursor forwards */
- tinyrl_vt100_cursor_forward
- (this->term, count);
- }
- /* now delete the characters */
- count = utf8_nsyms(this,
- this->last_buffer + line_len,
- (unsigned)-delta);
- tinyrl_vt100_erase(this->term,
- count);
- }
- break;
- }
- } else {
- /* are the lines are the same content? */
- if (0 == strcmp(this->line, this->last_buffer)) {
- if (this->echo_enabled
- || this->echo_char) {
- delta =
- (int)(this->point -
- this->last_point);
- if (delta > 0) {
- count = utf8_nsyms(this,
- this->line + this->last_point,
- (unsigned)delta);
- /* move the point forwards */
- tinyrl_vt100_cursor_forward
- (this->term, count);
- } else if (delta < 0) {
- count = utf8_nsyms(this,
- this->line + this->point,
- (unsigned)-delta);
- /* move the cursor backwards */
- tinyrl_vt100_cursor_back
- (this->term, count);
- }
- }
- /* done for now */
- break;
- }
- }
- } else {
- /* simply display the prompt and the line */
- tinyrl_vt100_printf(this->term, "%s", this->prompt);
- tinyrl_internal_print(this, this->line);
- if (this->point < line_len) {
- /* move the cursor to the insertion point */
- count = utf8_nsyms(this,
- this->line + this->point,
- line_len - this->point);
- tinyrl_vt100_cursor_back(this->term, count);
- }
- break;
- }
- /*
- * to have got this far we must have edited the middle of a line.
- */
- if (this->last_point) {
- /* move to just after the prompt of the line */
- count = utf8_nsyms(this, this->last_buffer, this->last_point);
- tinyrl_vt100_cursor_back(this->term, count);
- }
- /* erase the previous line */
- count = utf8_nsyms(this, this->last_buffer, last_line_len);
- tinyrl_vt100_erase(this->term, count);
- /* output the line accounting for the echo behaviour */
- tinyrl_internal_print(this, this->line);
- delta = (int)(line_len - this->point);
- if (delta) {
- /* move the cursor back to the insertion point */
- count = utf8_nsyms(this, this->line + this->point, delta);
- tinyrl_vt100_cursor_back(this->term, count);
- }
- } /*lint -e717 */ while (0) /*lint +e717 */
- ;
- /* update the display */
- (void)tinyrl_vt100_oflush(this->term);
- /* set up the last line buffer */
- lub_string_free(this->last_buffer);
- this->last_buffer = lub_string_dup(this->line);
- this->last_point = this->point;
- }
- /*----------------------------------------------------------------------- */
- tinyrl_t *tinyrl_new(FILE * instream,
- FILE * outstream,
- unsigned stifle, tinyrl_completion_func_t * complete_fn)
- {
- tinyrl_t *this = NULL;
- this = malloc(sizeof(tinyrl_t));
- if (NULL != this) {
- tinyrl_init(this, instream, outstream, stifle, complete_fn);
- }
- return this;
- }
- /*----------------------------------------------------------------------- */
- static char *internal_insertline(tinyrl_t * this, char *buffer)
- {
- char *p;
- char *s = buffer;
- /* strip any spurious '\r' or '\n' */
- p = strchr(buffer, '\r');
- if (NULL == p) {
- p = strchr(buffer, '\n');
- }
- if (NULL != p) {
- *p = '\0';
- }
- /* skip any whitespace at the beginning of the line */
- if (0 == this->point) {
- while (*s && isspace(*s)) {
- s++;
- }
- }
- if (*s) {
- /* append this string to the input buffer */
- (void)tinyrl_insert_text(this, s);
- /* echo the command to the output stream */
- tinyrl_redisplay(this);
- }
- return s;
- }
- /*----------------------------------------------------------------------- */
- static char *internal_readline(tinyrl_t * this,
- const char *prompt,
- void *context, const char *str)
- {
- FILE *istream = tinyrl_vt100__get_istream(this->term);
- int crlf = 1; /* Enable crlf if result is NULL */
- /* initialise for reading a line */
- this->done = BOOL_FALSE;
- this->point = 0;
- this->end = 0;
- this->buffer = lub_string_dup("");
- this->buffer_size = strlen(this->buffer);
- this->line = this->buffer;
- this->prompt = prompt;
- this->prompt_size = strlen(prompt);
- this->context = context;
- if ((BOOL_TRUE == this->isatty) && (!str)) {
- /* set the terminal into raw input mode */
- tty_set_raw_mode(this);
- tinyrl_reset_line_state(this);
- while (!this->done) {
- int key;
- /* update the display */
- tinyrl_redisplay(this);
- /* get a key */
- key = tinyrl_getchar(this);
- /* has the input stream terminated? */
- if (EOF != key) {
- /* call the handler for this key */
- if (BOOL_FALSE ==
- this->handlers[key] (this, key)) {
- /* an issue has occured */
- tinyrl_ding(this);
- }
- if (BOOL_TRUE == this->done) {
- /*
- * If the last character in the line (other than
- * the null) is a space remove it.
- */
- if (this->end
- && isspace(this->
- line[this->end - 1])) {
- tinyrl_delete_text(this,
- this->end -
- 1,
- this->end);
- }
- }
- } else {
- /* time to finish the session */
- this->done = BOOL_TRUE;
- this->line = NULL;
- }
- }
- /* restores the terminal mode */
- tty_restore_mode(this);
- } else {
- /* This is a non-interactive set of commands */
- char *s = 0, buffer[80];
- size_t len = sizeof(buffer);
- char *tmp = NULL;
- /* manually reset the line state without redisplaying */
- lub_string_free(this->last_buffer);
- this->last_buffer = NULL;
- if (str) {
- tmp = lub_string_dup(str);
- s = internal_insertline(this, tmp);
- } else {
- while ((sizeof(buffer) == len) &&
- (s = fgets(buffer, sizeof(buffer), istream))) {
- s = internal_insertline(this, buffer);
- len = strlen(buffer) + 1; /* account for the '\0' */
- }
- if (s == NULL
- || (this->line[0] == '\0' && feof(istream))) {
- /* time to finish the session */
- this->line = NULL;
- crlf = 0;
- }
- }
- /*
- * check against fgets returning null as either error or end of file.
- * This is a measure to stop potential task spin on encountering an
- * error from fgets.
- */
- if (this->line) {
- if (this->line[0] == '\0') {
- tinyrl_reset_line_state(this);
- } /* call the handler for the newline key */
- else if (BOOL_FALSE ==
- this->handlers[KEY_LF] (this, KEY_LF)) {
- /* an issue has occured */
- tinyrl_ding(this);
- this->line = NULL;
- }
- }
- if (str)
- lub_string_free(tmp);
- }
- /*
- * duplicate the string for return to the client
- * we have to duplicate as we may be referencing a
- * history entry or our internal buffer
- */
- {
- char *result = this->line ? lub_string_dup(this->line) : NULL;
- /* free our internal buffer */
- free(this->buffer);
- this->buffer = NULL;
- if (crlf && ((NULL == result) || ('\0' == *result))) {
- /* make sure we're not left on a prompt line */
- tinyrl_crlf(this);
- }
- return result;
- }
- }
- /*----------------------------------------------------------------------- */
- char *tinyrl_readline(tinyrl_t * this, const char *prompt, void *context)
- {
- return internal_readline(this, prompt, context, NULL);
- }
- /*----------------------------------------------------------------------- */
- char *tinyrl_forceline(tinyrl_t * this,
- const char *prompt, void *context, const char *line)
- {
- return internal_readline(this, prompt, context, line);
- }
- /*----------------------------------------------------------------------- */
- /*
- * Ensure that buffer has enough space to hold len characters,
- * possibly reallocating it if necessary. The function returns BOOL_TRUE
- * if the line is successfully extended, BOOL_FALSE if not.
- */
- bool_t tinyrl_extend_line_buffer(tinyrl_t * this, unsigned len)
- {
- bool_t result = BOOL_TRUE;
- if (this->buffer_size < len) {
- char *new_buffer;
- size_t new_len = len;
- /*
- * What we do depends on whether we are limited by
- * memory or a user imposed limit.
- */
- if (this->max_line_length == 0) {
- if (new_len < this->buffer_size + 10) {
- /* make sure we don't realloc too often */
- new_len = this->buffer_size + 10;
- }
- /* leave space for terminator */
- new_buffer = realloc(this->buffer, new_len + 1);
- if (NULL == new_buffer) {
- tinyrl_ding(this);
- result = BOOL_FALSE;
- } else {
- this->buffer_size = new_len;
- this->line = this->buffer = new_buffer;
- }
- } else {
- if (new_len < this->max_line_length) {
- /* Just reallocate once to the max size */
- new_buffer =
- realloc(this->buffer,
- this->max_line_length);
- if (NULL == new_buffer) {
- tinyrl_ding(this);
- result = BOOL_FALSE;
- } else {
- this->buffer_size =
- this->max_line_length - 1;
- this->line = this->buffer = new_buffer;
- }
- } else {
- tinyrl_ding(this);
- result = BOOL_FALSE;
- }
- }
- }
- return result;
- }
- /*----------------------------------------------------------------------- */
- /*
- * Insert text into the line at the current cursor position.
- */
- bool_t tinyrl_insert_text(tinyrl_t * this, const char *text)
- {
- unsigned delta = strlen(text);
- /*
- * If the client wants to change the line ensure that the line and buffer
- * references are in sync
- */
- changed_line(this);
- if ((delta + this->end) > (this->buffer_size)) {
- /* extend the current buffer */
- if (BOOL_FALSE ==
- tinyrl_extend_line_buffer(this, this->end + delta)) {
- return BOOL_FALSE;
- }
- }
- if (this->point < this->end) {
- /* move the current text to the right (including the terminator) */
- memmove(&this->buffer[this->point + delta],
- &this->buffer[this->point],
- (this->end - this->point) + 1);
- } else {
- /* terminate the string */
- this->buffer[this->end + delta] = '\0';
- }
- /* insert the new text */
- strncpy(&this->buffer[this->point], text, delta);
- /* now update the indexes */
- this->point += delta;
- this->end += delta;
- return BOOL_TRUE;
- }
- /*----------------------------------------------------------------------- */
- /*
- * A convenience function for displaying a list of strings in columnar
- * format on Readline's output stream. matches is the list of strings,
- * in argv format, such as a list of completion matches. len is the number
- * of strings in matches, and max is the length of the longest string in matches.
- * This function uses the setting of print-completions-horizontally to select
- * how the matches are displayed
- */
- void
- tinyrl_display_matches(const tinyrl_t * this,
- char *const *matches, unsigned len, size_t max)
- {
- unsigned r, c;
- unsigned width = tinyrl_vt100__get_width(this->term);
- unsigned cols = width / (max + 1); /* allow for a space between words */
- unsigned rows = len / cols + 1;
- assert(matches);
- if (matches) {
- len--, matches++; /* skip the subtitution string */
- /* print out a table of completions */
- for (r = 0; r < rows && len; r++) {
- for (c = 0; c < cols && len; c++) {
- const char *match = *matches++;
- len--;
- tinyrl_vt100_printf(this->term, "%-*s ", max,
- match);
- }
- tinyrl_crlf(this);
- }
- }
- }
- /*----------------------------------------------------------------------- */
- /*
- * Delete the text between start and end in the current line. (inclusive)
- * This adjusts the rl_point and rl_end indexes appropriately.
- */
- void tinyrl_delete_text(tinyrl_t * this, unsigned start, unsigned end)
- {
- unsigned delta;
- /*
- * If the client wants to change the line ensure that the line and buffer
- * references are in sync
- */
- changed_line(this);
- /* make sure we play it safe */
- if (start > end) {
- unsigned tmp = end;
- start = end;
- end = tmp;
- }
- if (end > this->end) {
- end = this->end;
- }
- delta = (end - start) + 1;
- /* move any text which is left */
- memmove(&this->buffer[start],
- &this->buffer[start + delta], this->end - end);
- /* now adjust the indexs */
- if (this->point >= start) {
- if (this->point > end) {
- /* move the insertion point back appropriately */
- this->point -= delta;
- } else {
- /* move the insertion point to the start */
- this->point = start;
- }
- }
- if (this->end > end) {
- this->end -= delta;
- } else {
- this->end = start;
- }
- /* put a terminator at the end of the buffer */
- this->buffer[this->end] = '\0';
- }
- /*----------------------------------------------------------------------- */
- bool_t tinyrl_bind_key(tinyrl_t * this, int key, tinyrl_key_func_t * fn)
- {
- bool_t result = BOOL_FALSE;
- if ((key >= 0) && (key < 256)) {
- /* set the key handling function */
- this->handlers[key] = fn;
- result = BOOL_TRUE;
- }
- return result;
- }
- /*-------------------------------------------------------- */
- /*
- * Returns an array of strings which is a list of completions for text.
- * If there are no completions, returns NULL. The first entry in the
- * returned array is the substitution for text. The remaining entries
- * are the possible completions. The array is terminated with a NULL pointer.
- *
- * entry_func is a function of two args, and returns a char *.
- * The first argument is text. The second is a state argument;
- * it is zero on the first call, and non-zero on subsequent calls.
- * entry_func returns a NULL pointer to the caller when there are no
- * more matches.
- */
- char **tinyrl_completion(tinyrl_t * this,
- const char *line,
- unsigned start,
- unsigned end, tinyrl_compentry_func_t * entry_func)
- {
- unsigned state = 0;
- size_t size = 1;
- unsigned offset = 1; /* need at least one entry for the substitution */
- char **matches = NULL;
- char *match;
- /* duplicate the string upto the insertion point */
- char *text = lub_string_dupn(line, end);
- /* now try and find possible completions */
- while ((match = entry_func(this, text, start, state++))) {
- if (size == offset) {
- /* resize the buffer if needed - the +1 is for the NULL terminator */
- size += 10;
- matches =
- realloc(matches, (sizeof(char *) * (size + 1)));
- }
- if (NULL == matches) {
- /* not much we can do... */
- break;
- }
- matches[offset] = match;
- /*
- * augment the substitute string with this entry
- */
- if (1 == offset) {
- /* let's be optimistic */
- matches[0] = lub_string_dup(match);
- } else {
- char *p = matches[0];
- size_t match_len = strlen(p);
- /* identify the common prefix */
- while ((tolower(*p) == tolower(*match)) && match_len--) {
- p++, match++;
- }
- /* terminate the prefix string */
- *p = '\0';
- }
- offset++;
- }
- /* be a good memory citizen */
- lub_string_free(text);
- if (matches) {
- matches[offset] = NULL;
- }
- return matches;
- }
- /*-------------------------------------------------------- */
- void tinyrl_delete_matches(char **this)
- {
- char **matches = this;
- while (*matches) {
- /* release the memory for each contained string */
- free(*matches++);
- }
- /* release the memory for the array */
- free(this);
- }
- /*-------------------------------------------------------- */
- void tinyrl_crlf(const tinyrl_t * this)
- {
- tinyrl_vt100_printf(this->term, "\n");
- }
- /*-------------------------------------------------------- */
- /*
- * Ring the terminal bell, obeying the setting of bell-style.
- */
- void tinyrl_ding(const tinyrl_t * this)
- {
- tinyrl_vt100_ding(this->term);
- }
- /*-------------------------------------------------------- */
- void tinyrl_reset_line_state(tinyrl_t * this)
- {
- /* start from scratch */
- lub_string_free(this->last_buffer);
- this->last_buffer = NULL;
- tinyrl_redisplay(this);
- }
- /*-------------------------------------------------------- */
- void tinyrl_replace_line(tinyrl_t * this, const char *text, int clear_undo)
- {
- size_t new_len = strlen(text);
- /* ignored for now */
- clear_undo = clear_undo;
- /* ensure there is sufficient space */
- if (BOOL_TRUE == tinyrl_extend_line_buffer(this, new_len)) {
- /* overwrite the current contents of the buffer */
- strcpy(this->buffer, text);
- /* set the insert point and end point */
- this->point = this->end = new_len;
- }
- tinyrl_redisplay(this);
- }
- /*-------------------------------------------------------- */
- static tinyrl_match_e
- tinyrl_do_complete(tinyrl_t * this, bool_t with_extensions)
- {
- tinyrl_match_e result = TINYRL_NO_MATCH;
- char **matches = NULL;
- unsigned start, end;
- bool_t completion = BOOL_FALSE;
- bool_t prefix = BOOL_FALSE;
- /* find the start and end of the current word */
- start = end = this->point;
- while (start && !isspace(this->line[start - 1])) {
- start--;
- }
- if (this->attempted_completion_function) {
- this->completion_over = BOOL_FALSE;
- this->completion_error_over = BOOL_FALSE;
- /* try and complete the current line buffer */
- matches = this->attempted_completion_function(this,
- this->line,
- start, end);
- }
- if ((NULL == matches)
- && (BOOL_FALSE == this->completion_over)) {
- /* insert default completion call here... */
- }
- if (matches) {
- /* identify and insert a common prefix if there is one */
- if (0 !=
- strncmp(matches[0], &this->line[start],
- strlen(matches[0]))) {
- /*
- * delete the original text not including
- * the current insertion point character
- */
- if (this->end != end) {
- end--;
- }
- tinyrl_delete_text(this, start, end);
- if (BOOL_FALSE == tinyrl_insert_text(this, matches[0])) {
- return TINYRL_NO_MATCH;
- }
- completion = BOOL_TRUE;
- }
- if (0 == lub_string_nocasecmp(matches[0], matches[1])) {
- /* this is just a prefix string */
- prefix = BOOL_TRUE;
- }
- /* is there more than one completion? */
- if (matches[2] != NULL) {
- char **tmp = matches;
- unsigned max, len;
- max = len = 0;
- while (*tmp) {
- size_t size = strlen(*tmp++);
- len++;
- if (size > max) {
- max = size;
- }
- }
- if (BOOL_TRUE == completion) {
- result = TINYRL_COMPLETED_AMBIGUOUS;
- } else if (BOOL_TRUE == prefix) {
- result = TINYRL_MATCH_WITH_EXTENSIONS;
- } else {
- result = TINYRL_AMBIGUOUS;
- }
- if ((BOOL_TRUE == with_extensions)
- || (BOOL_FALSE == prefix)) {
- /* Either we always want to show extensions or
- * we haven't been able to complete the current line
- * and there is just a prefix, so let the user see the options
- */
- tinyrl_crlf(this);
- tinyrl_display_matches(this, matches, len, max);
- tinyrl_reset_line_state(this);
- }
- } else {
- result =
- completion ? TINYRL_COMPLETED_MATCH : TINYRL_MATCH;
- }
- /* free the memory */
- tinyrl_delete_matches(matches);
- /* redisplay the line */
- tinyrl_redisplay(this);
- }
- return result;
- }
- /*-------------------------------------------------------- */
- tinyrl_match_e tinyrl_complete_with_extensions(tinyrl_t * this)
- {
- return tinyrl_do_complete(this, BOOL_TRUE);
- }
- /*-------------------------------------------------------- */
- tinyrl_match_e tinyrl_complete(tinyrl_t * this)
- {
- return tinyrl_do_complete(this, BOOL_FALSE);
- }
- /*-------------------------------------------------------- */
- void *tinyrl__get_context(const tinyrl_t * this)
- {
- return this->context;
- }
- /*--------------------------------------------------------- */
- const char *tinyrl__get_line(const tinyrl_t * this)
- {
- return this->line;
- }
- /*--------------------------------------------------------- */
- tinyrl_history_t *tinyrl__get_history(const tinyrl_t * this)
- {
- return this->history;
- }
- /*--------------------------------------------------------- */
- void tinyrl_completion_over(tinyrl_t * this)
- {
- this->completion_over = BOOL_TRUE;
- }
- /*--------------------------------------------------------- */
- void tinyrl_completion_error_over(tinyrl_t * this)
- {
- this->completion_error_over = BOOL_TRUE;
- }
- /*--------------------------------------------------------- */
- bool_t tinyrl_is_completion_error_over(const tinyrl_t * this)
- {
- return this->completion_error_over;
- }
- /*--------------------------------------------------------- */
- void tinyrl_done(tinyrl_t * this)
- {
- this->done = BOOL_TRUE;
- }
- /*--------------------------------------------------------- */
- void tinyrl_enable_echo(tinyrl_t * this)
- {
- this->echo_enabled = BOOL_TRUE;
- }
- /*--------------------------------------------------------- */
- void tinyrl_disable_echo(tinyrl_t * this, char echo_char)
- {
- this->echo_enabled = BOOL_FALSE;
- this->echo_char = echo_char;
- }
- /*--------------------------------------------------------- */
- void tinyrl__set_istream(tinyrl_t * this, FILE * istream)
- {
- tinyrl_vt100__set_istream(this->term, istream);
- this->isatty = isatty(fileno(istream)) ? BOOL_TRUE : BOOL_FALSE;
- }
- /*-------------------------------------------------------- */
- bool_t tinyrl__get_isatty(const tinyrl_t * this)
- {
- return this->isatty;
- }
- /*-------------------------------------------------------- */
- FILE *tinyrl__get_istream(const tinyrl_t * this)
- {
- return tinyrl_vt100__get_istream(this->term);
- }
- /*-------------------------------------------------------- */
- FILE *tinyrl__get_ostream(const tinyrl_t * this)
- {
- return tinyrl_vt100__get_ostream(this->term);
- }
- /*-------------------------------------------------------- */
- const char *tinyrl__get_prompt(const tinyrl_t * this)
- {
- return this->prompt;
- }
- /*-------------------------------------------------------- */
- bool_t tinyrl__get_utf8(const tinyrl_t * this)
- {
- return this->utf8;
- }
- /*-------------------------------------------------------- */
- void tinyrl__set_utf8(tinyrl_t * this, bool_t utf8)
- {
- this->utf8 = utf8;
- }
- /*-------------------------------------------------------- */
- bool_t tinyrl_is_quoting(const tinyrl_t * this)
- {
- bool_t result = BOOL_FALSE;
- /* count the quotes upto the current insertion point */
- unsigned i = 0;
- while (i < this->point) {
- if (this->line[i++] == '"') {
- result = result ? BOOL_FALSE : BOOL_TRUE;
- }
- }
- return result;
- }
- /*--------------------------------------------------------- */
- void tinyrl_limit_line_length(tinyrl_t * this, unsigned length)
- {
- this->max_line_length = length;
- }
- /*--------------------------------------------------------- */
|