editstring.h File Reference

Editable strings. More...

Go to the source code of this file.

Data Structures
struct	edit_string
	An editable string. More...
Functions
	FILE_LICENCE (GPL2_OR_LATER)
int	edit_string (struct edit_string *string, int key) __nonnull
	Edit editable string.

---

Detailed Description

Editable strings.

Definition in file editstring.h.

---

Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

int edit_string	(	struct edit_string *	string,
		int	key
	)

Edit editable string.

Parameters:

	string	Editable string
	key	Key pressed by user

Return values:

key

Key returned to application, or zero

Handles keypresses and updates the content of the editable string. Basic line editing facilities (delete/insert/cursor) are supported. If edit_string() understands and uses the keypress it will return zero, otherwise it will return the original key.

This function does not update the display in any way.

The string's edit history will be updated to allow the caller to efficiently bring the display into sync with the string content.

Definition at line 137 of file editstring.c.

References backspace(), edit_string::buf, CTRL_A, CTRL_B, CTRL_D, CTRL_E, CTRL_F, CTRL_K, edit_string::cursor, delete_character(), insert_character(), KEY_BACKSPACE, KEY_DC, KEY_END, KEY_HOME, KEY_LEFT, KEY_RIGHT, kill_eol(), and strlen().

Referenced by edit_editbox(), and readline().

                                                        {
        int retval = 0;
        size_t len = strlen ( string->buf );

        /* Prepare edit history */
        string->last_cursor = string->cursor;
        string->mod_start = string->cursor;
        string->mod_end = string->cursor;

        /* Interpret key */
        if ( ( key >= 0x20 ) && ( key <= 0x7e ) ) {
                /* Printable character; insert at current position */
                insert_character ( string, key );
        } else switch ( key ) {
        case KEY_BACKSPACE:
                /* Backspace */
                backspace ( string );
                break;
        case KEY_DC:
        case CTRL_D:
                /* Delete character */
                delete_character ( string );
                break;
        case CTRL_K:
                /* Delete to end of line */
                kill_eol ( string );
                break;
        case KEY_HOME:
        case CTRL_A:
                /* Start of line */
                string->cursor = 0;
                break;
        case KEY_END:
        case CTRL_E:
                /* End of line */
                string->cursor = len;
                break;
        case KEY_LEFT:
        case CTRL_B:
                /* Cursor left */
                if ( string->cursor > 0 )
                        string->cursor--;
                break;
        case KEY_RIGHT:
        case CTRL_F:
                /* Cursor right */
                if ( string->cursor < len )
                        string->cursor++;
                break;
        default:
                retval = key;
                break;
        }

        return retval;
}