[PATCH] Printf: libc independent I/O error test

[Petr Vaněk]

Printf test suite fails on systems with musl libc because tests for "%m"
and "%M" formats expect "Input/output error" message but musl returns
"I/O error". Proposed change compares the printf output with string
returned from strerror function for EIO constant.

See-also: https://bugs.gentoo.org/836713
Signed-off-by: Petr Vaněk <arkamar at atlas.cz>
---
 lib/printf_test.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/printf_test.c b/lib/printf_test.c
index 47ea905d..ca278975 100644
--- a/lib/printf_test.c
+++ b/lib/printf_test.c
@@ -32,11 +32,14 @@ t_simple(void)
   BSPRINTF(1, "@", buf, "@", 64);
   BSPRINTF(1, "\xff", buf, "%c", 0xff);
 
+  const char * io_error_str = strerror(EIO);
+  const int io_error_len = strlen(io_error_str);
+
   errno = 5;
-  BSPRINTF(18, "Input/output error", buf, "%m");
+  BSPRINTF(io_error_len, io_error_str, buf, "%m");
   errno = 0;
 
-  BSPRINTF(18, "Input/output error", buf, "%M", 5);
+  BSPRINTF(io_error_len, io_error_str, buf, "%M", 5);
 
   BSPRINTF(11, "TeSt%StRiNg", buf, "%s", "TeSt%StRiNg");
 
-- 
2.39.2