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tools/nolibc: add err.h

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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
This commit is contained in:
Thomas Weißschuh 2026-03-18 16:50:17 +01:00
parent b74be92274
commit 9da0f529c0
3 changed files with 89 additions and 0 deletions
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1
tools/include/nolibc/Makefile
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@ -30,6 +30,7 @@ all_files := \
ctype.h \
dirent.h \
elf.h \
err.h \
errno.h \
fcntl.h \
getopt.h \

87
tools/include/nolibc/err.h Normal file
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@ -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 */

1
tools/include/nolibc/nolibc.h
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@ -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