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From: "matz at suse dot de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug localedata/13691] New: Assertion with vi_VN.tcvn locale
Date: Tue, 14 Feb 2012 14:58:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=13691

             Bug #: 13691
           Summary: Assertion with vi_VN.tcvn locale
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: localedata
        AssignedTo: libc-locales@sources.redhat.com
        ReportedBy: matz@suse.de
    Classification: Unclassified


The following program result in an assertion failure in __mbsnrtowcs:

% cat bug.c
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <locale.h>
#include <wchar.h>

int main()
{
  const char * string = "Z";
  size_t len;
  wchar_t ignore[1];
  const char *str2 = string;
  const char *strend = string + 1;
  mbstate_t ps;
  printf("Locale: %s\n", setlocale(LC_ALL, "vi_VN.tcvn"));
  memset (&ps, '\0', sizeof (ps));
  while (str2 != NULL && str2 < strend)
    if (mbsnrtowcs (ignore, &str2, strend - str2, 1, &ps) == (size_t) -1)
      break;
  return 0;
}

# ./elf/ld.so --library-path . ./a.out
Locale: vi_VN.tcvn
a.out: mbsnrtowcs.c:124: __mbsnrtowcs: Assertion `result > 0' failed.
Aborted

The reason is that the gconv loop doesn't make progress.  I.e. somewhere
there's a problem in ./iconvdata/tcvn5712-1.c .  The assert is here in
wcsmbs/mbsnrtowcs.c :

      status = DL_CALL_FCT (fct,
                            (towc, &data, (const unsigned char **) src,
                             srcend, NULL, &dummy, 0, 1));
      result = (wchar_t *) data.__outbuf - dst;
      /* We have to determine whether the last character converted
         is the NUL character.  */
      if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
          && (assert (result > 0),

status is __GCONV_EMPTY_INPUT, but nothing is written to the output buffer
(and it's not incremented).

I _think_ this is because of the handling of the buffered character in
state->__count.  After the iconv call above data.__state->__count is
720, which is 90 << 3, which is the value of the "Z" character.  So it's
buffered, but it doesn't seem to be emitted to outbuf when the input
comes to an end.

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