Add a few convenient helpers to print error and warning messages.
Signed-off-by: Thomas Weißschuh <[email protected]>
---
tools/include/nolibc/Makefile | 1 +
tools/include/nolibc/err.h | 91 +++++++++++++++++++++++++++++++++++++++++++
tools/include/nolibc/nolibc.h | 1 +
3 files changed, 93 insertions(+)
diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index 1958dda98895..5d242312943f 100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -30,6 +30,7 @@ all_files := \
ctype.h \
dirent.h \
elf.h \
+ err.h \
errno.h \
fcntl.h \
getopt.h \
diff --git a/tools/include/nolibc/err.h b/tools/include/nolibc/err.h
new file mode 100644
index 000000000000..2373c4999b71
--- /dev/null
+++ b/tools/include/nolibc/err.h
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * formatted error message for NOLIBC
+ * Copyright (C) 2026 Thomas Weißschuh <[email protected]>
+ */
+
+/* make sure to include all global symbols */
+#include "nolibc.h"
+
+#ifndef _NOLIBC_ERR_H
+#define _NOLIBC_ERR_H
+
+#include "errno.h"
+#include "stdarg.h"
+#include "sys.h"
+
+static __attribute__((unused))
+void vwarn(const char *fmt, va_list args)
+{
+#ifndef NOLIBC_IGNORE_ERRNO
+ fprintf(stderr, "%s: ", program_invocation_short_name);
+#endif
+ vfprintf(stderr, fmt, args);
+ fprintf(stderr, ": %m\n");
+}
+
+static __attribute__((unused))
+void vwarnx(const char *fmt, va_list args)
+{
+#ifndef NOLIBC_IGNORE_ERRNO
+ fprintf(stderr, "%s: ", program_invocation_short_name);
+#endif
+ vfprintf(stderr, fmt, args);
+ fprintf(stderr, "\n");
+}
+
+static __attribute__((unused))
+void warn(const char *fmt, ...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ vwarn(fmt, args);
+ va_end(args);
+}
+
+static __attribute__((unused))
+void warnx(const char *fmt, ...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ vwarnx(fmt, args);
+ va_end(args);
+}
+
+static __attribute__((noreturn, unused))
+void verr(int eval, const char *fmt, va_list args)
+{
+ vwarn(fmt, args);
+ exit(eval);
+}
+
+static __attribute__((noreturn, unused))
+void verrx(int eval, const char *fmt, va_list args)
+{
+ warnx(fmt, args);
+ exit(eval);
+}
+
+static __attribute__((noreturn, unused))
+void err(int eval, const char *fmt, ...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ verr(eval, fmt, args);
+ va_end(args);
+}
+
+static __attribute__((noreturn, unused))
+void errx(int eval, const char *fmt, ...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ verrx(eval, fmt, args);
+ va_end(args);
+}
+
+#endif /* _NOLIBC_ERR_H */
diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h
index d1d08b7f8599..fe8195483b6d 100644
--- a/tools/include/nolibc/nolibc.h
+++ b/tools/include/nolibc/nolibc.h
@@ -130,6 +130,7 @@
#include "getopt.h"
#include "poll.h"
#include "math.h"
+#include "err.h"
/* Used by programs to avoid std includes */
#define NOLIBC
--
2.53.0
