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[avr-libc-dev] [bug #35366] Bad behaviour for fprintf_P function

From: Damien Espitallier
Subject: [avr-libc-dev] [bug #35366] Bad behaviour for fprintf_P function
Date: Wed, 25 Jan 2012 13:28:33 +0000
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1


                 Summary: Bad behaviour for fprintf_P function
                 Project: AVR C Runtime Library
            Submitted by: espitall
            Submitted on: mer. 25 janv. 2012 13:28:32 GMT
                Category: Library
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: libc code
                  Status: None
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 1.7.1
           Fixed Release: None



In order to print a single '%' character with fprintf_P, I must put %%%% in my
format string.

A string format "e1=%f %% e2=%f" seems to be interpreted as if I wrote "e1=%f
% e2=%f" (which create a false %e token and corrupt my output)

It seems that the string format is parsed twice, so the only way I found to
have my single % is to add two extra % 

The vnsprintf function has the same bug (but not the simple printf function)

I use the 1.7.1 version provided by atmel but I didn't see any trace of this
bug in changelog of newer versions.


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