/* re_addc():
* Draw c, expanding tabs, control chars etc.
*/
static void
re_addc(EditLine *el, wint_t c)
{
switch (ct_chr_class(c)) {
case CHTYPE_TAB: /* expand the tab */
for (;;) {
re_putc(el, ' ', 1);
if ((el->el_refresh.r_cursor.h & 07) == 0)
break; /* go until tab stop */
}
break;
case CHTYPE_NL: {
int oldv = el->el_refresh.r_cursor.v;
re_putc(el, '\0', 0); /* assure end of line */
if (oldv == el->el_refresh.r_cursor.v) /* XXX */
re_nextline(el);
break;
}
case CHTYPE_PRINT:
re_putc(el, c, 1);
break;
default: {
wchar_t visbuf[VISUAL_WIDTH_MAX];
ssize_t i, n =
ct_visual_char(visbuf, VISUAL_WIDTH_MAX, c);
for (i = 0; n-- > 0; ++i)
re_putc(el, visbuf[i], 1);
break;
}
}
}
libedit_private ssize_t
ct_visual_char(wchar_t *dst, size_t len, wchar_t c)
{
int t = ct_chr_class(c);
switch (t) {
case CHTYPE_TAB:
case CHTYPE_NL:
case CHTYPE_ASCIICTL:
if (len < 2)
return -1; /* insufficient space */
*dst++ = '^';
if (c == '\177')
*dst = '?'; /* DEL -> ^? */
else
*dst = c | 0100; /* uncontrolify it */
return 2;
case CHTYPE_PRINT:
if (len < 1)
return -1; /* insufficient space */
*dst = c;
return 1;
case CHTYPE_NONPRINT:
/* we only use single-width glyphs for display,
* so this is right */
if ((ssize_t)len < ct_visual_width(c))
return -1; /* insufficient space */
*dst++ = '\\';
*dst++ = 'U';
*dst++ = '+';
#define tohexdigit(v) "0123456789ABCDEF"[v]
if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
*dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf);
*dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf);
*dst++ = tohexdigit(((unsigned int) c >> 8) & 0xf);
*dst++ = tohexdigit(((unsigned int) c >> 4) & 0xf);
*dst = tohexdigit(((unsigned int) c ) & 0xf);
return c > 0xffff ? 8 : 7;
/*FALLTHROUGH*/
/* these two should be handled outside this function */
default: /* we should never hit the default */
return 0;
}
}
libedit_private int
ct_visual_width(wchar_t c)
{
int t = ct_chr_class(c);
switch (t) {
case CHTYPE_ASCIICTL:
return 2; /* ^@ ^? etc. */
case CHTYPE_TAB:
return 1; /* Hmm, this really need to be handled outside! */
case CHTYPE_NL:
return 0; /* Should this be 1 instead? */
case CHTYPE_PRINT:
return wcwidth(c);
case CHTYPE_NONPRINT:
if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
return 8; /* \U+12345 */
else
return 7; /* \U+1234 */
default:
return 0; /* should not happen */
}
}
