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#3181 printf double vsnprintf() fix, malloc, va_end (#3184)

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* Use loc_buf for small strings, check for error return from vsnprintf

* cleanup arg when bailing out of new

* Use malloc/free instead of new/delete in printf

* Return actual bytes written in printf

* FIX: write before free
This commit is contained in:
Tijs van Roon 2019-09-08 22:49:32 +02:00 committed by Me No Dev
parent 07613b3158
commit 717ca79ecb
1 changed files with 11 additions and 6 deletions
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17
cores/esp32/Print.cpp
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@ -52,19 +52,24 @@ size_t Print::printf(const char *format, ...)
va_list copy;
va_start(arg, format);
va_copy(copy, arg);
size_t len = vsnprintf(NULL, 0, format, copy);
int len = vsnprintf(temp, sizeof(loc_buf), format, copy);
va_end(copy);
if(len < 0) {
va_end(arg);
return 0;
};
if(len >= sizeof(loc_buf)){
temp = new char[len+1];
temp = (char*) malloc(len+1);
if(temp == NULL) {
va_end(arg);
return 0;
}
len = vsnprintf(temp, len+1, format, arg);
}
len = vsnprintf(temp, len+1, format, arg);
write((uint8_t*)temp, len);
va_end(arg);
if(len >= sizeof(loc_buf)){
delete[] temp;
len = write((uint8_t*)temp, len);
if(temp != loc_buf){
free(temp);
}
return len;
}