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BREAKING: Add Print::availableForWrite method (#7658)

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* Add Print::availableForWrite method

Adds an availableForWrite() method to the Print class, matching current
ArduinoCore-API commit 398e70f188e2b861c10d9ffe5e2bfcb6a4a4f489 .

Hook availableForWrite into the SDFS filesystem (other FSes don't have
this capability built-in).

Fixes #7650

* WiFiClient::availableForWrite proto matching Print

* Fix Netdump signedness warning

* Clean up Serial availableForWrite

This is evidently a breaking change due to the type difference.
Arduino's `availableForWrite` returns an `int`, while the
(multiply-implemented, non-virtual) core `availableForWrite` returned
`size_t`.
This commit is contained in:
Earle F. Philhower, III
2020-10-27 03:55:42 -07:00
committed by GitHub
parent 95de525af9
commit 7f38e141c7
10 changed files with 28 additions and 9 deletions
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8
libraries/ESP8266WiFi/examples/WiFiTelnetToSerial/WiFiTelnetToSerial.ino
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@ -173,10 +173,10 @@ void loop() {
// determine maximum output size "fair TCP use"
// client.availableForWrite() returns 0 when !client.connected()
size_t maxToTcp = 0;
int maxToTcp = 0;
for (int i = 0; i < MAX_SRV_CLIENTS; i++)
if (serverClients[i]) {
size_t afw = serverClients[i].availableForWrite();
int afw = serverClients[i].availableForWrite();
if (afw) {
if (!maxToTcp) {
maxToTcp = afw;
@ -190,11 +190,11 @@ void loop() {
}
//check UART for data
size_t len = std::min((size_t)Serial.available(), maxToTcp);
size_t len = std::min(Serial.available(), maxToTcp);
len = std::min(len, (size_t)STACK_PROTECTOR);
if (len) {
uint8_t sbuf[len];
size_t serial_got = Serial.readBytes(sbuf, len);
int serial_got = Serial.readBytes(sbuf, len);
// push UART data to all connected telnet clients
for (int i = 0; i < MAX_SRV_CLIENTS; i++)
// if client.availableForWrite() was 0 (congested)