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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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15 changes: 10 additions & 5 deletions cores/esp32/Print.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -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);
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I've just thought of something, This print function is used for many different subsystems. I think some of them may actually have cases where write() can fail. instead of returning the number of characters to be written, actually return the true number.

int actualLen = write((uint8_t*)temp,len);
...
return actualLen;

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Ill add/fix that

va_end(arg);
if(len >= sizeof(loc_buf)){
delete[] temp;
if(len >= sizeof(loc_buf)) {
free(temp);
}
return len;
}
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