On CentOS 6 (glibc 2.12) I see this test failure:
FAIL: test-mbrtoc32-regular
===========================
../../gltests/test-mbrtoc32-regular.c:65: assertion 'mbsinit (&state)' failed
FAIL test-mbrtoc32-regular (exit status: 134)
This patch fixes it, in the same way as for newer glibc versions.
2023-08-16 Bruno Haible <br...@clisp.org>
mbrtoc32-regular: Make it work as expected on glibc 2.12.
* lib/mbrtoc32.c (mbrtoc32): If necessary, clear the mbstate_t after
mbrtowc() returned.
diff --git a/lib/mbrtoc32.c b/lib/mbrtoc32.c
index 558717d517..0933437a4b 100644
--- a/lib/mbrtoc32.c
+++ b/lib/mbrtoc32.c
@@ -255,6 +255,14 @@ mbrtoc32 (char32_t *pwc, const char *s, size_t n,
mbstate_t *ps)
/* char32_t and wchar_t are equivalent. Use mbrtowc(). */
wchar_t wc;
size_t ret = mbrtowc (&wc, s, n, ps);
+
+# if GNULIB_MBRTOC32_REGULAR
+ /* Ensure that mbrtoc32 is regular. */
+ if (ret < (size_t) -2 && ! mbsinit (ps))
+ /* This occurs on glibc 2.12. */
+ mbszero (ps);
+# endif
+
# if GL_CHAR32_T_IS_UNICODE && GL_CHAR32_T_VS_WCHAR_T_NEEDS_CONVERSION
if (ret < (size_t) -2 && wc != 0)
{
