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Fix RawSerial when used with ARMCC microlib #1497

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Merged
0xc0170 merged 1 commit into from
Jan 11, 2016
Merged

Fix RawSerial when used with ARMCC microlib #1497

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5 changes: 4 additions & 1 deletion libraries/mbed/common/RawSerial.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,10 @@ int RawSerial::puts(const char *str) {
int RawSerial::printf(const char *format, ...) {
std::va_list arg;
va_start(arg, format);
int len = vsnprintf(NULL, 0, format, arg);
// ARMCC microlib does not properly handle a size of 0.
// As a workaround supply a dummy buffer with a size of 1.
char dummy_buf[1];
int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
if (len < STRING_STACK_LIMIT) {
char temp[STRING_STACK_LIMIT];
vsprintf(temp, format, arg);
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