[Bug 839] New: cal produces garbled week-day names when locale is Japan or Taiwan

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=839

           Summary: cal produces garbled week-day names when locale is Japan
                    or Taiwan
           Product: Busybox
           Version: 1.16.x
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: FIXME
          Severity: major
          Priority: P3
         Component: Other
        AssignedTo: unassigned at busybox.net
        ReportedBy: cookie at ms93.url.com.tw
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


Dear Sir/Madam,
     cal produces garbled week-day names when locale is zh_TW.utf8 or
ja_JP.utf8, although it works well when locale is C.    Please refer to the
upper-left window in attached PNG file for details.
     After tracing the code, I found that the bug is located in line 126 of
coreutils/cal.c of version 1.16.0.git.  It seems to be inappropriate for
strncpy to copy the first 2 bytes in buf when locale is zh_TW.utf8 or
ja_JP.utf8.

/* code segment: from line 124 to line 126 of coreutils/cal.c of v1.16.0.git */
zero_tm.tm_wday = i;
strftime(buf, sizeof(buf), "%a", &zero_tm);
strncpy(day_headings + i * (3+julian) + julian, buf, 2);

     By the way, my OS is Quirky Linux v0.0.2, which is a variant of Puppy
Linux.

Best regards,
CHIN-YUAN KUO
Jan. 3, 2010


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