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From: "bugzilla at tecnocode dot co.uk" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug locale/31030] New: ERA segments are nul-separated rather than
 semicolon-separated
Date: Fri, 03 Nov 2023 17:17:47 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31030

            Bug ID: 31030
           Summary: ERA segments are nul-separated rather than
                    semicolon-separated
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: locale
          Assignee: unassigned at sourceware dot org
          Reporter: bugzilla at tecnocode dot co.uk
  Target Milestone: ---

nl_langinfo(3) says =E2=80=9CEra description segments are separated by semi=
colons=E2=80=9D, but
it appears that `nl_langinfo (ERA)` returns them separated by nul bytes
instead, and the only way to parse them is to additionally call the
(undocumented) `nl_langinfo (_NL_TIME_ERA_NUM_ENTRIES)` to find out how many
segments there are meant to be.

This can be demonstrated with the following example program (compile with `=
gcc
-o era era.c -Wall`):
```
#include <langinfo.h>
#include <locale.h>
#include <stdint.h>
#include <stdio.h>

int
main (void)
{
  setlocale (LC_ALL, "");
  const char *era =3D nl_langinfo (ERA);
  int n_entries =3D (int) (intptr_t) nl_langinfo (_NL_TIME_ERA_NUM_ENTRIES);

  printf ("n_entries: %d, era: %s\n", n_entries, era);

  return 0;
}
```

If run with `LANG=3Dth_TH.UTF-8 ./era` it prints
```
n_entries: 1, era: +:1:-543/01/01:+*:=E0=B8=9E.=E0=B8=A8.:%EC %Ey
```
which is all good.

However, if run with `LANG=3Dja_JP.UTF-8 ./era`, it prints:
```
n_entries: 11, era: +:2:2020/01/01:+*:=E4=BB=A4=E5=92=8C:%EC%Ey=E5=B9=B4
```

There clearly aren=E2=80=99t 11 segments in the =E2=80=99era=E2=80=99 descr=
iption there =E2=80=94 only one.
Looking at the ja_JP locale definition, there are correctly 11 segments def=
ined
in it:
https://github.com/bminor/glibc/blob/master/localedata/locales/ja_JP#L14949=
-L14977

If I read past 10 nul terminators in the `era` string, I can retrieve all 11
segments. So the locale definition does work. It just doesn=E2=80=99t match=
 up to what
nl_langinfo(3) says, and requires using the undocumented
`_NL_TIME_ERA_NUM_ENTRIES` to read all segments.

Is there a reason `era` is using nul separators? Could it be switched to us=
ing
semicolons please? :)

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