Re: [PATCH v3 05/12] tools/nolibc: implement %m if errno is not defined

On 2025-09-24 16:20:52+0200, Benjamin Berg wrote:

From: Benjamin Berg benjamin.berg@intel.com

For improved compatibility, print %m as "unknown error" when nolibc is compiled using NOLIBC_IGNORE_ERRNO.

Signed-off-by: Benjamin Berg benjamin.berg@intel.com

Thanks for taking care of this.

Acked-by: Thomas Weißschuh linux@weissschuh.net

---

tools/include/nolibc/stdio.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h index 724d05ce6962..1f16dab2ac88 100644 --- a/tools/include/nolibc/stdio.h +++ b/tools/include/nolibc/stdio.h @@ -321,11 +321,13 @@ int __nolibc_printf(__nolibc_printf_cb cb, intptr_t state, size_t n, const char if (!outstr) outstr="(null)"; } -#ifndef NOLIBC_IGNORE_ERRNO else if (c == 'm') { +#ifdef NOLIBC_IGNORE_ERRNO

• 		outstr = "unknown error";
  

+#else outstr = strerror(errno);

• 	}
  

#endif /* NOLIBC_IGNORE_ERRNO */

• 	}
  else if (c == '%') {
  	/* queue it verbatim */
  	continue;
  

-- 2.51.0