[perl #132626] perl5 sprintf: wrong output on format %a

# New Ticket Created by  Wolf-Dietrich Moeller 
# Please include the string:  [perl #132626]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=132626 >


This is a bug report for perl from wolf-dietrich_moeller@t-online.de,
generated with the help of perlbug 1.40 running under perl 5.26.1.


-----------------------------------------------------------------
sprintf generates a wrong output for the format "%a".
The test program below gives the output lines:

0x1.ep+4  30.000000  3.000000e+001  30
0x1.ep+4  0X1.EP+4  30.000000  30

Line 1 shows the buggy result of "%a".
Line 2 shows that under certain combinations of format
parameters the bug even extends to the next parameter.

######## test program #########
print sprintf("%a  %f  %e  %g\n",30,30,30,30);
print sprintf("%a  %e  %f  %g\n",30,30,30,30);
######## end test program #####
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl 5.26.1:

Configured by strawberry-perl at Sat Sep 23 23:10:19 2017.

Summary of my perl5 (revision 5 version 26 subversion 1) configuration:
   
  Platform:
    osname=MSWin32
    osvers=6.3
    archname=MSWin32-x86-multi-thread-64int
    uname='Win32 strawberry-perl 5.26.1.1 #1 Sat Sep 23 23:07:28 2017 i386'
    config_args='undef'
    hint=recommended
    useposix=true
    d_sigaction=undef
    useithreads=define
    usemultiplicity=define
    use64bitint=define
    use64bitall=undef
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
    bincompat5005=undef
  Compiler:
    cc='gcc'
    ccflags =' -s -O2 -DWIN32 -D__USE_MINGW_ANSI_STDIO
-DPERL_TEXTMODE_SCRIPTS -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS
-DUSE_PERLIO -fwrapv -fno-strict-aliasing -mms-bitfields'
    optimize='-s -O2'
    cppflags='-DWIN32'
    ccversion=''
    gccversion='7.1.0'
    gccosandvers=''
    intsize=4
    longsize=4
    ptrsize=4
    doublesize=8
    byteorder=12345678
    doublekind=3
    d_longlong=define
    longlongsize=8
    d_longdbl=define
    longdblsize=12
    longdblkind=3
    ivtype='long long'
    ivsize=8
    nvtype='double'
    nvsize=8
    Off_t='long long'
    lseeksize=8
    alignbytes=8
    prototype=define
  Linker and Libraries:
    ld='g++'
    ldflags ='-s -L"C:\Perl\perl\lib\CORE" -L"C:\Perl\c\lib"'
    libpth=C:\Perl\c\lib C:\Perl\c\i686-w64-mingw32\lib
C:\Perl\c\lib\gcc\i686-w64-mingw32\7.1.0
    libs= -lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdlg32
-ladvapi32 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -lws2_32 -lmpr
-lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32
    perllibs= -lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdlg32
-ladvapi32 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -lws2_32 -lmpr
-lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32
    libc=
    so=dll
    useshrplib=true
    libperl=libperl526.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_win32.xs
    dlext=xs.dll
    d_dlsymun=undef
    ccdlflags=' '
    cccdlflags=' '
    lddlflags='-mdll -s -L"C:\Perl\perl\lib\CORE" -L"C:\Perl\c\lib"'


---
@INC for perl 5.26.1:
    C:/Perl/perl/site/lib
    C:/Perl/perl/vendor/lib
    C:/Perl/perl/lib

---
Environment for perl 5.26.1:
    HOME (unset)
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=<content
cleared>;C:\Perl\c\bin;C:\Perl\perl\site\bin;C:\Perl\perl\bin
    PERL_BADLANG (unset)
    SHELL (unset)

• [perl #132626] perl5 sprintf: wrong output on format %a by Wolf-Dietrich Moeller
• Re: [perl #132626] perl5 sprintf: wrong output on format %a by sisyphus1
• Re: [perl #132626] perl5 sprintf: wrong output on format %a by Zefram
• Re: [perl #132626] perl5 sprintf: wrong output on format %a by Zefram