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extmod/uos_dupterm: Update uos.dupterm() and helper funcs to have index.

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The uos.dupterm() signature and behaviour is updated to reflect the latest
enhancements in the docs.  It has minor backwards incompatibility in that
it no longer accepts zero arguments.

The dupterm_rx helper function is moved from esp8266 to extmod and
generalised to support multiple dupterm slots.

A port can specify multiple slots by defining the MICROPY_PY_OS_DUPTERM
config macro to an integer, being the number of slots it wants to have;
0 means to disable the dupterm feature altogether.

The unix and esp8266 ports are updated to work with the new interface and
are otherwise unchanged with respect to functionality.
This commit is contained in:
Damien George
2017-10-13 20:01:57 +11:00
parent e39fcda8eb
commit 37282f8fc1
8 changed files with 97 additions and 75 deletions
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17
ports/unix/unix_mphal.c
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@@ -108,11 +108,11 @@ void mp_hal_stdio_mode_orig(void) {
#endif
#if MICROPY_PY_OS_DUPTERM
static int call_dupterm_read(void) {
static int call_dupterm_read(size_t idx) {
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
mp_obj_t read_m[3];
mp_load_method(MP_STATE_PORT(term_obj), MP_QSTR_read, read_m);
mp_load_method(MP_STATE_VM(dupterm_objs[idx]), MP_QSTR_read, read_m);
read_m[2] = MP_OBJ_NEW_SMALL_INT(1);
mp_obj_t res = mp_call_method_n_kw(1, 0, read_m);
if (res == mp_const_none) {
@@ -122,18 +122,18 @@ static int call_dupterm_read(void) {
mp_get_buffer_raise(res, &bufinfo, MP_BUFFER_READ);
if (bufinfo.len == 0) {
mp_printf(&mp_plat_print, "dupterm: EOF received, deactivating\n");
MP_STATE_PORT(term_obj) = NULL;
MP_STATE_VM(dupterm_objs[idx]) = MP_OBJ_NULL;
return -1;
}
nlr_pop();
return *(byte*)bufinfo.buf;
} else {
// Temporarily disable dupterm to avoid infinite recursion
mp_obj_t save_term = MP_STATE_PORT(term_obj);
MP_STATE_PORT(term_obj) = NULL;
mp_obj_t save_term = MP_STATE_VM(dupterm_objs[idx]);
MP_STATE_VM(dupterm_objs[idx]) = NULL;
mp_printf(&mp_plat_print, "dupterm: ");
mp_obj_print_exception(&mp_plat_print, nlr.ret_val);
MP_STATE_PORT(term_obj) = save_term;
MP_STATE_VM(dupterm_objs[idx]) = save_term;
}
return -1;
@@ -143,10 +143,11 @@ static int call_dupterm_read(void) {
int mp_hal_stdin_rx_chr(void) {
unsigned char c;
#if MICROPY_PY_OS_DUPTERM
if (MP_STATE_PORT(term_obj) != MP_OBJ_NULL) {
// TODO only support dupterm one slot at the moment
if (MP_STATE_VM(dupterm_objs[0]) != MP_OBJ_NULL) {
int c;
do {
c = call_dupterm_read();
c = call_dupterm_read(0);
} while (c == -2);
if (c == -1) {
goto main_term;