[avr-libc-dev] [bug #43442] sprintf function incorrectly interprets format parameters

[anonymous]

URL:
  <http://savannah.nongnu.org/bugs/?43442>

                 Summary: sprintf function incorrectly interprets format
parameters
                 Project: AVR C Runtime Library
            Submitted by: None
            Submitted on: Sun 19 Oct 2014 10:00:12 PM UTC
                Category: Library
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: libc code
                  Status: None
        Percent Complete: 0%
             Assigned to: None
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 1.8.0
           Fixed Release: None

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Details:

Function sprintf incorrectly interprets passed parameters, on following
example:

char someString[3];
uint8_t number = 0;

number = 9;
sprintf(someString, "%02u", number);

Now in someString we will have 09 but when we do this:

number = 10;
sprintf(someString, "%02u", number);

Then in someString we have 16, not 10 as we expect. But when we change format
from "%02u" to "%02x" then it works fine, and we have 10 in someString. Of
course with values 20, 30 and so on problem also exist. From what I can see,
this function interpret %u as hex(10 in HEX is 16 in DEC) and %x as decimal
but it should be interpreted inversely.




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