[avr-libc-dev] [bug #22800] sprintf() expands a 128char string parameter incorrectly

[David Prentice]

URL:
  <http://savannah.nongnu.org/bugs/?22800>

                 Summary: sprintf() expands a 128char string parameter
incorrectly 
                 Project: AVR C Runtime Library
            Submitted by: david_prentice
            Submitted on: Tuesday 01/04/08 at 12:34
                Category: Library
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: libc code
                  Status: None
        Percent Complete: 0%
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
           Fixed Release: None

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Details:

In the unlikely event that a very long string parameter is sent to sprintf(),
 the expanded string is a space padded 256 byte string.   A regular (less than
128 bytes long) string behaves normally.

e.g.:

<pre>
#include <avr/io.h>
#include <stdio.h>

char buffer[300], string[200];
char tmp[] ="123";

int main ( void )
{
   int i;
   // just put some data to the buffer
   for (i=0; i<129; i++)
   {
      string[i] = 'B';
   }
   // try to add a string to the buffer
   sprintf (buffer,"%s%s",string,tmp);
   
   while (1)
   {
   }
   return 1;
}
</pre>

the buffer becomes: "   ...  BB...BB123"
instead of          "BB...BB123"

 




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