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ESP core printf implementation in AVR core. #482

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ESP core printf implementation in AVR core. #482

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83c437f
Added ESP core `printf` implementation.
jfjlaros Jun 17, 2022
5806b17
Layout, indents and removed compiler warning.
jfjlaros Jun 17, 2022
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30 changes: 30 additions & 0 deletions cores/arduino/Print.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -264,3 +264,33 @@ size_t Print::printFloat(double number, uint8_t digits)

return n;
}

size_t Print::printf(const char *format, ...)
{
char loc_buf[64];
char* temp = loc_buf;
va_list arg;
va_list copy;
va_start(arg, format);
va_copy(copy, arg);
int len = vsnprintf(temp, sizeof(loc_buf), format, copy);
va_end(copy);
if (len < 0) {
va_end(arg);
return 0;
}
if (len >= (int)sizeof(loc_buf)) {
temp = (char*)malloc(len + 1);
if (temp == NULL) {
va_end(arg);
return 0;
}
len = vsnprintf(temp, len + 1, format, arg);
}
va_end(arg);
len = write((uint8_t*)temp, len);
if (temp != loc_buf) {
free(temp);
}
return len;
}
2 changes: 2 additions & 0 deletions cores/arduino/Print.h
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,8 @@ class Print
size_t print(double, int = 2);
size_t print(const Printable&);

size_t printf(const char * format, ...) __attribute__ ((format (printf, 2, 3)));

size_t println(const __FlashStringHelper *);
size_t println(const String &s);
size_t println(const char[]);
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