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

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Merged
merged 6 commits into from
Sep 8, 2019
Merged

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

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3f5ecc2
Use loc_buf for small strings, check for error return from vsnprintf
knifter Sep 6, 2019
68001da
cleanup arg when bailing out of new
knifter Sep 6, 2019
f1817c0
Use malloc/free instead of new/delete in printf
knifter Sep 6, 2019
e0f0351
Return actual bytes written in printf
knifter Sep 6, 2019
811f27c
FIX: write before free
knifter Sep 6, 2019
c7147a5
Merge branch 'master' into master
me-no-dev Sep 8, 2019
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5 changes: 2 additions & 3 deletions cores/esp32/Print.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -66,12 +66,11 @@ size_t Print::printf(const char *format, ...)
}
len = vsnprintf(temp, len+1, format, arg);
}
write((uint8_t*)temp, len);
va_end(arg);
if(len >= sizeof(loc_buf)) {
if(temp != loc_buf){
free(temp);
}
return len;
return write((uint8_t*)temp, len);
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don't do it this way, the buffer has already been freed, free() will overwrite the content of temp with the delete chain links.

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oops... absolutely right, a sec

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@stickbreaker stickbreaker Sep 6, 2019 •
edited
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you could:

if(temp != loc_buf){
     len = write((uint8_t*)temp,len);  
     free(temp);
}
else len=write((uint8_t*)temp,len);
return len;

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@knifter knifter Sep 6, 2019 •
edited
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I also want to write(temp) if temp == loc_buf
e: right, too soon. But see commit

}

size_t Print::print(const __FlashStringHelper *ifsh)
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