// Wrapper used by diag_printf()
static void
_mon_write_char(char c, void **param)
{
if (c == '\n') {
mon_write_char('\r');
}
mon_write_char(c);
}
static void
zm_flush(void)
{
#ifdef REDBOOT
char *p = zm_out_start;
while (*p) mon_write_char(*p++);
#endif
zm_out = zm_out_start;
}
//
// Read a line of input from the user
// Return:
// _GETS_OK: 'n' valid characters received
// _GETS_GDB: '$' (GDB lead-in)
// _GETS_TIMEOUT: No input before timeout
// _GETS_CTRLC: ^C typed
//
// if CYGNUM_REDBOOT_CMD_LINE_EDITING != 0
// Command line history support
// ^P - Select previous line from history
// ^N - Select next line from history
// ^A - Move insertion [cursor] to start of line
// ^E - Move cursor to end of line
// ^B - Move cursor back [previous character]
// ^F - Move cursor forward [next character]
// "standard" arrow keys work as well
// left ^[[D == ^B
// right ^[[C == ^F
// up ^[[A == ^P
// down ^[[B == ^N
// home ^[[H/^[1~ == ^A
// end ^[[F/^[OF == ^E
// del ^[3~ == ^D
//
int
_rb_gets_preloaded(char *buf, int buflen, int timeout)
{
char *ip = buf; // Insertion point
char *eol = buf; // End of line
char c;
bool res = false;
static char last_ch = '\0';
int _timeout;
#if CYGNUM_REDBOOT_CMD_LINE_EDITING != 0
int _index = _cl_index; // Last saved line
char *xp;
#ifdef CYGSEM_REDBOOT_CMD_LINE_ANSI_SEQUENCES
int ansi_state = 0; // Used to drive ANSI parser
char ansi_char = '\0';
#endif
#endif
// Display current buffer data
while (*eol) {
mon_write_char(*eol++);
}
ip = eol;
while (true) {
#ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
if (getc_script(&c))
do_idle(false);
else
#endif
if ((timeout > 0) && (eol == buf)) {
#define MIN_TIMEOUT 50
_timeout = timeout > MIN_TIMEOUT ? MIN_TIMEOUT : timeout;
mon_set_read_char_timeout(_timeout);
while (timeout > 0) {
res = mon_read_char_with_timeout(&c);
if (res) {
// Got a character
do_idle(false);
break;
}
timeout -= _timeout;
}
if (res == false) {
do_idle(true);
return _GETS_TIMEOUT; // Input timed out
}
} else {
mon_read_char(&c);
}
*eol = '\0';
#define CTRL(c) ((c)&0x1F)
#ifdef CYGSEM_REDBOOT_CMD_LINE_ANSI_SEQUENCES
// Special handling of ANSI keyboard sequences (arrows, etc)
if (c == '\x1B') {
// Leadin for ANSI keyboard sequence
ansi_state = 1;
continue;
}
switch (ansi_state) {
case 0:
// No ANSI sequence in progress
break;
case 1:
// ESC seen, look for '['
if (c == '[') {
ansi_state = 2;
} else if (c == 'O') {
ansi_state = 4;
} else {
// Handle bad sequences?
ansi_state = 0;
}
continue;
case 2:
// ESC+[ seen, process key
ansi_state = 0;
switch (c) {
case 'A':
c = CTRL('P');
break;
case 'B':
c = CTRL('N');
break;
case 'C':
c = CTRL('F');
break;
case 'D':
c = CTRL('B');
break;
case 'F':
c = CTRL('E');
break;
case 'H':
c = CTRL('A');
break;
case '1':
ansi_char = CTRL('A');
ansi_state = 3;
continue;
case '3':
ansi_char = CTRL('D');
ansi_state = 3;
continue;
default:
// Handle bad sequences?
continue;
}
break;
case 3:
// Sequences like ^[[1~ == ^H
ansi_state = 0;
if (c == '~') {
c = ansi_char;
} else {
// Handle bad sequences?
continue;
}
break;
case 4:
// Sequences like ^[OF == ^E
ansi_state = 0;
if (c == 'F') {
c = CTRL('E');
} else {
// Handle bad sequences?
continue;
}
break;
}
#endif
switch (c) {
#if CYGNUM_REDBOOT_CMD_LINE_EDITING != 0
case CTRL('P'):
// Fetch the previous line into the buffer
if (_index >= 0) {
// Erase the previous line [crude]
while (ip != buf) {
mon_write_char('\b');
mon_write_char(' ');
mon_write_char('\b');
ip--;
}
strcpy(buf, _cl_lines[_index]);
while (*ip) {
mon_write_char(*ip++);
}
eol = ip;
// Move to previous line
_index--;
if (_index < 0) {
_index = _cl_max_index;
}
} else {
mon_write_char(0x07); // Audible bell on most devices
}
break;
case CTRL('N'):
// Fetch the next line into the buffer
if (_index >= 0) {
if (++_index > _cl_max_index) _index = 0;
// Erase the previous line [crude]
while (ip != buf) {
mon_write_char('\b');
mon_write_char(' ');
mon_write_char('\b');
ip--;
}
strcpy(buf, _cl_lines[_index]);
while (*ip) {
mon_write_char(*ip++);
}
eol = ip;
} else {
mon_write_char(0x07); // Audible bell on most devices
}
break;
case CTRL('B'):
// Move insertion point backwards
if (ip != buf) {
mon_write_char('\b');
ip--;
}
break;
case CTRL('F'):
// Move insertion point forwards
if (ip != eol) {
mon_write_char(*ip++);
}
break;
case CTRL('E'):
// Move insertion point to end of line
while (ip != eol) {
mon_write_char(*ip++);
}
break;
case CTRL('A'):
// Move insertion point to beginning of line
if (ip != buf) {
xp = ip;
while (xp-- != buf) {
mon_write_char('\b');
}
}
ip = buf;
break;
case CTRL('K'):
// Kill to the end of line
if (ip != eol) {
xp = ip;
while (xp++ != eol) {
mon_write_char(' ');
}
while (--xp != ip) {
mon_write_char('\b');
}
eol = ip;
}
break;
case CTRL('D'):
// Erase the character under the cursor
if (ip != eol) {
xp = ip;
eol--;
while (xp != eol) {
*xp = *(xp+1);
mon_write_char(*xp++);
}
mon_write_char(' '); // Erases last character
mon_write_char('\b');
while (xp-- != ip) {
mon_write_char('\b');
}
}
break;
#endif // CYGNUM_REDBOOT_CMD_LINE_EDITING
case CTRL('C'): // ^C
// Abort current input
diag_printf("^C\n");
*buf = '\0'; // Nothing useful in buffer
return _GETS_CTRLC;
case '\n':
case '\r':
// If previous character was the "other" end-of-line, ignore this one
if (((c == '\n') && (last_ch == '\r')) ||
((c == '\r') && (last_ch == '\n'))) {
c = '\0';
break;
}
// End of line
if (console_echo) {
mon_write_char('\r');
mon_write_char('\n');
}
last_ch = c;
#if CYGNUM_REDBOOT_CMD_LINE_EDITING != 0
if (cmd_history) {
// History handling - only when enabled
#ifdef CYGBLD_REDBOOT_CMD_LINE_HISTORY
expand_history(buf);
#endif
if (*buf != '\0') {
if (++_cl_index == _CL_NUM_LINES) {
_cl_index = 0;
}
if (_cl_index > _cl_max_index) _cl_max_index = _cl_index;
strcpy(_cl_lines[_cl_index], buf);
_cl_real_index++;
}
}
#endif
return _GETS_OK;
case '\b':
case 0x7F: // DEL
if (ip != buf) {
#if CYGNUM_REDBOOT_CMD_LINE_EDITING != 0
if (ip != eol) {
ip--;
mon_write_char('\b');
xp = ip;
while (xp != (eol-1)) {
*xp = *(xp+1);
mon_write_char(*xp++);
}
mon_write_char(' '); // Erases last character
mon_write_char('\b');
while (xp-- != ip) {
mon_write_char('\b');
}
} else {
if (console_echo) {
mon_write_char('\b');
mon_write_char(' ');
mon_write_char('\b');
}
ip--;
}
eol--;
#else
if (console_echo) {
mon_write_char('\b');
mon_write_char(' ');
mon_write_char('\b');
}
ip--;
eol--;
#endif
}
break;
#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
case '+': // fall through
case '$':
if (ip == buf || last_ch != '\\')
{
// Give up and try GDB protocol
ungetDebugChar(c); // Push back character so stubs will see it
return _GETS_GDB;
}
if (last_ch == '\\') {
#if CYGNUM_REDBOOT_CMD_LINE_EDITING != 0
if (ip == eol) {
// Just save \$ as $
eol = --ip;
} else {
mon_write_char('\b');
*--ip = c;
mon_write_char(c);
break;
}
#else
ip--; // Save \$ as $
#endif
}
// else fall through
#endif
default:
#if CYGNUM_REDBOOT_CMD_LINE_EDITING != 0
// If the insertion point is not at the end of line, make space for it
if (ip != eol) {
xp = eol;
*++eol = '\0';
while (xp != ip) {
*xp = *(xp-1);
xp--;
}
}
#endif
if (console_echo) {
mon_write_char((unsigned char)c);
}
if (ip == eol) {
// Advance both pointers
*ip++ = c;
eol = ip;
#if CYGNUM_REDBOOT_CMD_LINE_EDITING != 0
} else {
// Just insert the character
*ip++ = c;
xp = ip;
while (xp != eol) {
mon_write_char(*xp++);
}
while (xp-- != ip) {
mon_write_char('\b');
}
#endif
}
}
last_ch = c;
if (ip == buf + buflen - 1) { // Buffer full
*ip = '\0';
return buflen;
}
}
}