[avr-libc-dev] [bug #22593] vfscanf improperly scans string parameters with a width option by 1 character

[brent sirna]

URL:
  <http://savannah.nongnu.org/bugs/?22593>

                 Summary: vfscanf improperly scans string parameters with a
width option by 1 character
                 Project: AVR C Runtime Library
            Submitted by: bsirna
            Submitted on: Friday 03/14/2008 at 17:58
                Category: Library
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
        Percent Complete: 0%
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

The following code illustrates the bug.

    char
        s1[5],
        s2[5];

    int
        result;

    s1[0] = 0;
    s2[0] = 0;
    result = sscanf_P( ",ABCD,EFGH,", PSTR( ",%4s,%4s," ), &s1, &s2 );
    printf_P( PSTR( "%d %s %s\r\n" ), result, s1, s2 );

    s1[0] = 0;
    s2[0] = 0;
    result = sscanf_P( ",ABCD,EFGH,", PSTR( ",%3s,%3s," ), &s1, &s2 );
    printf_P( PSTR( "%d %s %s\r\n" ), result, s1, s2 );

results from executing this code.

1 ABCD 
2 ABC EFG

Had a quick look at the code and I believe the problem is that when the loop
is exited in the case statement for the 's' one extra character has been
removed from the stream;

Best regards

Brent






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