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getstrex.cpp
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getstrex.cpp
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#define _XOPEN_SOURCE_EXTENDED 1
#define PDC_NCMOUSE
#if defined( VT) || defined( XCURSES) || defined( _WIN32) || defined( __WATCOMC__)
#define PDC_FORCE_UTF8
#include <curses.h>
#else
#define NCURSES_WIDECHAR 1
#define HAVE_NCURSESW
#if defined( __cplusplus)
#if defined(__has_include)
#if __has_include( <ncursesw/cursesw.h>)
#include <ncursesw/cursesw.h>
#elif __has_include( <cursesw.h>)
#include <cursesw.h>
#else
#include <curses.h>
#endif
#else
#include <curses.h>
#endif
#else
#include <curses.h>
#endif
#endif
#include <wchar.h>
#include <assert.h>
#ifdef _WIN32
#include <stdbool.h>
#include <stdlib.h>
#else
#include <unistd.h>
#endif
#include <string.h>
#ifdef __cplusplus
extern "C" {
#endif /* #ifdef __cplusplus */
int wgetnstr_ex(WINDOW *win, char *str, int *loc, int maxlen, const int size);
int wgetn_wstr_ex(WINDOW *win, wint_t *wstr, int *loc, const int maxlen, const int size);
int getnstr_ex( char *str, int *loc, int maxlen, const int size);
int getn_wstr_ex( wint_t *wstr, int *loc, const int maxlen, const int size);
#ifdef __cplusplus
}
#endif /* #ifdef __cplusplus */
#define MAXLINE 255
#define _ECHAR 0x08 /* Erase char (^H) */
#define _DWCHAR 0x17 /* Delete Word char (^W) */
#define _DLCHAR 0x15 /* Delete Line char (^U) */
#define _ESCAPE 0x1B
#define _TAB 0x09
#ifdef __WATCOMC__
int wget_wch(WINDOW *win, wint_t *wch)
{
const int key = wgetch( win);
if (key == ERR)
return ERR;
*wch = (wint_t)key;
return( key >= KEY_MIN && key < KEY_MAX) ? KEY_CODE_YES : OK;
}
#endif
/* At least for the nonce, the cursor will be 'normal' in overwrite mode
and 'very visible' in insert mode. */
#ifdef __PDCURSESMOD__
#define _HAVE_OPAQUE_SCREEN_FUNCS
#endif
#ifdef NCURSES_VERSION_PATCH
#if NCURSES_VERSION_PATCH >= 20230812
#define _HAVE_OPAQUE_SCREEN_FUNCS
#endif
#endif
#define CURSOR_INSERT 2
#define CURSOR_OVERWRITE 1
/* "Extended" wgetn_wstr(), for both ncurses and PDCurses. You can
supply an initial string, location within that string, and the maximum
number of columns to be consumed on-screen (the text will be clipped
suitably to keep the cursor visible). You can switch to insert mode and
use the cursor keys to move backward/forward within the text and
reposition the cursor using the mouse.
Other differences :
-- 'maxlen' includes the trailing '\0' character, unlike wgetn_wstr().
-- If Escape is hit, or any function key, or the mouse is clicked
outside the text area, that key is returned. The calling routine
can then handle that key/click and re-start this function if desired.
-- Unfortunately, there's no way to tell if echo() or cbreak() have
been called without getting into Curses internals. So these are only
restored in PDCursesMod.
-- Currently in wide-char form only. That's the only one I actually use.
To do : return when Shift-Tab, etc. are hit; fullwidth/combining characters;
perhaps allow text to be marked by click-drag. */
static bool _insert_mode = FALSE;
int wgetn_wstr_ex(WINDOW *win, wint_t *wstr, int *loc, const int maxlen, const int size)
{
int i, x, y, offset = 0, initial_cursor_state;
int rval = -1;
#ifdef _HAVE_OPAQUE_SCREEN_FUNCS
const int oldcbreak = is_cbreak( ); /* remember states */
const int oldecho = is_echo( );
#endif
const bool oldnodelay = is_nodelay( win);
assert( win);
assert( wstr);
if (!win || !wstr)
return ERR;
x = getcurx( win);
y = getcury( win);
initial_cursor_state = curs_set( _insert_mode ? CURSOR_INSERT : CURSOR_OVERWRITE);
noecho( ); /* we do echo ourselves */
cbreak(); /* ensure each key is returned immediately */
nodelay( win, FALSE) ; /* don't return -1 */
while( rval < 0)
{
int len = 0, wget_wch_rval;
wint_t ch;
move( y, x);
while( len < maxlen && wstr[len])
len++;
assert( len != maxlen);
if( len == maxlen)
{
rval = -1;
break;
}
if( *loc < offset)
offset = *loc;
else if( offset < *loc - size + 1)
offset = *loc + 1 - size;
for( i = 0; i < size; i++)
waddch( win, (i + offset >= len) ? (chtype)' ' : (chtype)wstr[i + offset]);
move( y, x + *loc - offset);
wrefresh(win);
wget_wch_rval = wget_wch( win, &ch);
if( wget_wch_rval == OK && (ch == _ECHAR || ch == 127 || ch == KEY_BACKSPACE))
{
wget_wch_rval = KEY_CODE_YES;
ch = KEY_BACKSPACE;
}
if( wget_wch_rval == KEY_CODE_YES)
switch( ch)
{
case KEY_DC: /* delete char */
if( wstr[*loc])
for( i = *loc + 1; i <= len; i++)
wstr[i - 1] = wstr[i];
break;
case KEY_BACKSPACE: /* CTRL-H -- Delete character */
if( *loc)
{
for( i = *loc; i <= len; i++)
wstr[i - 1] = wstr[i];
(*loc)--;
}
break;
case KEY_LEFT:
if( *loc)
(*loc)--;
break;
case KEY_RIGHT:
if( wstr[*loc])
(*loc)++;
break;
case KEY_IC:
_insert_mode = !_insert_mode;
curs_set( _insert_mode ? CURSOR_INSERT : CURSOR_OVERWRITE);
break;
case KEY_HOME:
*loc = 0;
break;
case KEY_END:
*loc = len;
break;
case KEY_ENTER:
#ifdef PADENTER
case PADENTER:
#endif
rval = 0;
break;
case KEY_MOUSE:
{
MEVENT mouse_event;
#ifdef __PDCURSES__
nc_getmouse( &mouse_event);
#else
getmouse( &mouse_event); /* sneak a peek at where the */
ungetmouse( &mouse_event); /* click occurred */
wget_wch( win, &ch);
#endif
if( (mouse_event.bstate & BUTTON1_CLICKED) && mouse_event.y == y
&& mouse_event.x >= x && mouse_event.x < x + size)
{
*loc = offset + mouse_event.x - x;
if( *loc > len)
*loc = len;
}
else
rval = ch;
}
break;
default:
rval = ch;
break;
}
if( wget_wch_rval == OK)
switch( ch)
{
case _DLCHAR: /* CTRL-U -- Delete line */
*loc = 0;
wstr[0] = '\0';
break;
case _DWCHAR: /* CTRL-W -- Delete word */
{
int i = 0;
while( *loc && wstr[*loc - 1] == ' ')
(*loc)--; /* back up over spaces, if any */
while( *loc && wstr[*loc - 1] != ' ')
(*loc)--; /* back up to start of actual word */
while( *loc && wstr[*loc - 1] == ' ')
{
(*loc)--; /* back up over preceding spaces, if any */
i++;
}
while( *loc + i < len && wstr[*loc + i] != ' ')
i++; /* count characters in the word */
len -= i;
memmove( wstr + *loc, wstr + *loc + i,
(len + 1 - *loc) * sizeof( wint_t));
}
break;
case '\n':
case '\r':
rval = 0;
break;
case _ESCAPE:
case _TAB:
rval = ch;
break;
default:
if( ch >= ' ')
{
if( (!_insert_mode && *loc < maxlen - 1)
|| (_insert_mode && len < maxlen - 1))
{
if( *loc == len) /* at end of line */
wstr[len + 1] = 0;
else if( _insert_mode)
{
for( i = len; i >= *loc; i--)
wstr[i + 1] = wstr[i];
}
wstr[*loc] = ch;
(*loc)++;
}
else
beep( );
}
break;
}
}
#ifdef _HAVE_OPAQUE_SCREEN_FUNCS
oldcbreak ? cbreak( ) : nocbreak( ); /* restore states */
oldecho ? echo( ) : noecho( );
#endif
if( oldnodelay)
nodelay( win, TRUE);
curs_set( initial_cursor_state);
return rval;
}
int wgetnstr_ex(WINDOW *win, char *str, int *loc, int maxlen, const int size)
{
wchar_t wstr[MAXLINE + 1];
const wchar_t *wptr = wstr;
const char *strptr = str;
mbstate_t ps;
int rval;
if (maxlen < 0 || maxlen > MAXLINE)
maxlen = MAXLINE;
memset( &ps, 0, sizeof( ps));
if( mbsrtowcs( wstr, &strptr, maxlen, &ps) == (size_t)-1)
return( -1);
rval = wgetn_wstr_ex(win, (wint_t *)wstr, loc, maxlen, size);
memset( &ps, 0, sizeof( ps));
if( wcsrtombs(str, &wptr, maxlen, &ps) == (size_t)-1)
return( -1);
return( rval);
}
int getnstr_ex( char *str, int *loc, int maxlen, const int size)
{
return( wgetnstr_ex( stdscr, str, loc, maxlen, size));
}
int getn_wstr_ex( wint_t *wstr, int *loc, const int maxlen, const int size)
{
return( wgetn_wstr_ex( stdscr, wstr, loc, maxlen, size));
}