tools/nolibc: add err.h

Add a few convenient helpers to print error and warning messages.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20260318-nolibc-err-h-v4-2-08247a694bd9@weissschuh.net

diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index 1958dda988954d8a604b28f5feb75ebb67ee2e14..5d242312943ff48fa111fba3090a2b92410412e6 100644 (file)
--- 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 (file)
index 0000000..e22ae87
--- /dev/null
+++ b/tools/include/nolibc/err.h
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * formatted error message for NOLIBC
+ * Copyright (C) 2026 Thomas Weißschuh <linux@weissschuh.net>
+ */
+
+/* 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)
+{
+       fprintf(stderr, "%s: ", program_invocation_short_name);
+       vfprintf(stderr, fmt, args);
+       fprintf(stderr, ": %m\n");
+}
+
+static __attribute__((unused))
+void vwarnx(const char *fmt, va_list args)
+{
+       fprintf(stderr, "%s: ", program_invocation_short_name);
+       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 d1d08b7f859952fdf6a1ad76ead94ae9f56f755a..fe8195483b6d19a7577a71f8341a9ae079de4a19 100644 (file)
--- 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