From: Willy Tarreau <w@1wt.eu>
To: "Paul E . McKenney" <paulmck@kernel.org>
Cc: linux-kernel@vger.kernel.org, Ammar Faizi <ammarfaizi2@gnuweeb.org>
Subject: [PATCH 1/8] tools/nolibc/stdio: make printf(%s) accept NULL
Date: Mon, 21 Mar 2022 18:33:07 +0100 [thread overview]
Message-ID: <20220321173314.7519-2-w@1wt.eu> (raw)
In-Reply-To: <20220321173314.7519-1-w@1wt.eu>
It's often convenient to support this, especially in test programs where
a NULL may correspond to an allocation error or a non-existing value.
Let's make printf("%s") support being passed a NULL. In this case it
prints "(null)" like glibc's printf().
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
tools/include/nolibc/stdio.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index cb4d3ab3a565..559ebe052a75 100644
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -220,6 +220,8 @@ int vfprintf(FILE *stream, const char *fmt, va_list args)
}
else if (c == 's') {
outstr = va_arg(args, char *);
+ if (!outstr)
+ outstr="(null)";
}
else if (c == '%') {
/* queue it verbatim */
--
2.35.1
next prev parent reply other threads:[~2022-03-21 17:33 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-21 17:33 [PATCH 0/8] nolibc: small updates required for the self-tests Willy Tarreau
2022-03-21 17:33 ` Willy Tarreau [this message]
2022-03-21 17:33 ` [PATCH 2/8] tools/nolibc/stdlib: add a simple getenv() implementation Willy Tarreau
2022-03-21 17:33 ` [PATCH 3/8] tools/nolibc/stdio: add support for '%p' to vfprintf() Willy Tarreau
2022-03-21 17:33 ` [PATCH 4/8] tools/nolibc/string: add strcmp() and strncmp() Willy Tarreau
2022-03-21 17:33 ` [PATCH 5/8] tools/nolibc/sys: add syscall definition for getppid() Willy Tarreau
2022-03-21 17:33 ` [PATCH 6/8] tools/nolibc/types: add poll() and waitpid() flag definitions Willy Tarreau
2022-03-21 17:33 ` [PATCH 7/8] tools/nolibc: add a makefile to install headers Willy Tarreau
2022-03-21 17:33 ` [PATCH 8/8] tools/nolibc: add the nolibc subdir to the common Makefile Willy Tarreau
2022-03-21 20:29 ` [PATCH 0/8] nolibc: small updates required for the self-tests Paul E. McKenney
2022-03-21 20:33 ` Willy Tarreau
2022-03-21 20:42 ` Paul E. McKenney
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