FAR struct nxterm_state_s *
nxterm_register(NXTERM handle, FAR struct nxterm_window_s *wndo,
FAR const struct nxterm_operations_s *ops, int minor)
{
FAR struct nxterm_state_s *priv;
FAR const struct nx_font_s *fontset;
char devname[NX_DEVNAME_SIZE];
NXHANDLE hfont;
int ret;
DEBUGASSERT(handle && wndo && ops && (unsigned)minor < 256);
/* Allocate the driver structure */
priv = (FAR struct nxterm_state_s *)kmm_zalloc(sizeof(struct nxterm_state_s));
if (!priv)
{
gerr("ERROR: Failed to allocate the NX driver structure\n");
return NULL;
}
/* Initialize the driver structure */
priv->ops = ops;
priv->handle = handle;
priv->minor = minor;
memcpy(&priv->wndo, wndo, sizeof(struct nxterm_window_s));
nxsem_init(&priv->exclsem, 0, 1);
#ifdef CONFIG_DEBUG_FEATURES
priv->holder = NO_HOLDER;
#endif
#ifdef CONFIG_NXTERM_NXKBDIN
/* The waitsem semaphore is used for signaling and, hence, should not have
* priority inheritance enabled.
*/
nxsem_init(&priv->waitsem, 0, 0);
nxsem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
#endif
/* Connect to the font cache for the configured font characteristics */
priv->fcache = nxf_cache_connect(wndo->fontid, wndo->fcolor[0],
wndo->wcolor[0], CONFIG_NXTERM_BPP,
CONFIG_NXTERM_CACHESIZE);
if (priv->fcache == NULL)
{
gerr("ERROR: Failed to connect to font cache for font ID %d: %d\n",
wndo->fontid, errno);
goto errout;
}
/* Get the handle of the font managed by the font cache */
hfont = nxf_cache_getfonthandle(priv->fcache);
if (hfont == NULL)
{
gerr("ERROR: Failed to get handlr for font ID %d: %d\n",
wndo->fontid, errno);
goto errout;
}
/* Get information about the font set being used and save this in the
* state structure
*/
fontset = nxf_getfontset(hfont);
priv->fheight = fontset->mxheight;
priv->fwidth = fontset->mxwidth;
priv->spwidth = fontset->spwidth;
/* Set up the text cache */
priv->maxchars = CONFIG_NXTERM_MXCHARS;
/* Set the initial display position */
nxterm_home(priv);
/* Show the cursor */
priv->cursor.code = CONFIG_NXTERM_CURSORCHAR;
nxterm_showcursor(priv);
/* Register the driver */
snprintf(devname, NX_DEVNAME_SIZE, NX_DEVNAME_FORMAT, minor);
ret = register_driver(devname, &g_nxterm_drvrops, 0666, priv);
if (ret < 0)
{
gerr("ERROR: Failed to register %s\n", devname);
}
return (NXTERM)priv;
errout:
kmm_free(priv);
return NULL;
}
static ssize_t nxterm_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct nxterm_state_s *priv;
enum nxterm_vt100state_e state;
ssize_t remaining;
char ch;
int ret;
/* Recover our private state structure */
DEBUGASSERT(filep && filep->f_priv);
priv = (FAR struct nxterm_state_s *)filep->f_priv;
/* Get exclusive access */
ret = nxterm_semwait(priv);
if (ret < 0)
{
return ret;
}
/* Hide the cursor while we update the display */
nxterm_hidecursor(priv);
/* Loop writing each character to the display */
for (remaining = (ssize_t)buflen; remaining > 0; remaining--)
{
/* Get the next character from the user buffer */
ch = *buffer++;
/* Check if this character is part of a VT100 escape sequence */
do
{
/* Is the character part of a VT100 escape sequnce? */
state = nxterm_vt100(priv, ch);
switch (state)
{
/* Character is not part of a VT100 escape sequence (and no
* characters are buffer.
*/
default:
case VT100_NOT_CONSUMED:
{
/* We can output the character to the window */
nxterm_putc(priv, (uint8_t)ch);
}
break;
/* The full VT100 escape sequence was processed (and the new
* character was consumed)
*/
case VT100_PROCESSED:
/* Character was consumed as part of the VT100 escape processing
* (but the escape sequence is still incomplete.
*/
case VT100_CONSUMED:
{
/* Do nothing... the VT100 logic owns the character */
}
break;
/* Invalid/unsupported character in escape sequence */
case VT100_ABORT:
{
int i;
/* Add the first unhandled character to the window */
nxterm_putc(priv, (uint8_t)priv->seq[0]);
/* Move all buffer characters down one */
for (i = 1; i < priv->nseq; i++)
{
priv->seq[i-1] = priv->seq[i];
}
priv->nseq--;
/* Then loop again and check if what remains is part of a
* VT100 escape sequence. We could speed this up by
* checking if priv->seq[0] == ASCII_ESC.
*/
}
break;
}
}
while (state == VT100_ABORT);
}
/* Show the cursor at its new position */
nxterm_showcursor(priv);
nxterm_sempost(priv);
return (ssize_t)buflen;
}
