[Bug libc/16554] New: memset incorrect for negative signed char

["geoff at dyalog dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=16554

            Bug ID: 16554
           Summary: memset incorrect for negative signed char
           Product: glibc
           Version: 2.13
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: geoff at dyalog dot com
                CC: drepper.fsp at gmail dot com

memset() for the ARM does not honour the "converted to an unsigned char"
required by 7.21.6.1 of ISO/IEC 9899:1999(E)

signed char smallint = -3;
signed char smallarray[10];

memset(smallarray, smallint, 10);

results in smallarray[0] ââ -3
           smallarray[1] ââ -1
           smallarray[2] ââ -1
           smallarray[3] ââ -1
           smallarray[4] ââ -3
...
code widens the smallint of -3 to int with sign extension - correctly. memset()
fails to AND this with 0xff before shifting and ORing.

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