linux-kernel - [PATCH v2 next 04/11] tools/nolibc/printf: Output pad characters in 16 byte chunks

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Message-Id: <20260206191121.3602-5-david.laight.linux@gmail.com>
Date: Fri,  6 Feb 2026 19:11:14 +0000
From: david.laight.linux@...il.com
To: Willy Tarreau <w@....eu>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	linux-kernel@...r.kernel.org,
	Cheng Li <lechain@...il.com>
Cc: David Laight <david.laight.linux@...il.com>
Subject: [PATCH v2 next 04/11] tools/nolibc/printf: Output pad characters in 16 byte chunks

From: David Laight <david.laight.linux@...il.com>

Simple to do and saves calls to the callback function.

Signed-off-by: David Laight <david.laight.linux@...il.com>
---

Changes for v2:
Formally patch 3, unchanged.

 tools/include/nolibc/stdio.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index 552f09d51d82..c044a6b3babe 100644
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -355,10 +355,12 @@ int __nolibc_printf(__nolibc_printf_cb cb, void *state, const char *fmt, va_list
 			outstr = fmt;
 			len = ofs - 1;
 		flush_str:
-			while (width-- > len) {
-				if (cb(state, " ", 1) != 0)
+			while (width > len) {
+				unsigned int pad_len = ((width - len - 1) & 15) + 1;
+				width -= pad_len;
+				written += pad_len;
+				if (cb(state, "                ", pad_len) != 0)
 					return -1;
-				written += 1;
 			}
 			if (cb(state, outstr, len) != 0)
 				return -1;
-- 
2.39.5