linux-kernel - [PATCH 05/32] lib/string_helpers: string_get

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Date:   Sun, 14 Aug 2022 17:19:44 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org,
        Kent Overstreet <kent.overstreet@...il.com>,
        Andy Shevchenko <andy@...nel.org>
Subject: [PATCH 05/32] lib/string_helpers: string_get_size() now returns characters wrote

From: Kent Overstreet <kent.overstreet@...il.com>

printbuf now needs to know the number of characters that would have been
written if the buffer was too small, like snprintf(); this changes
string_get_size() to return the return value of snprintf().

Signed-off-by: Kent Overstreet <kent.overstreet@...il.com>
Cc: Andy Shevchenko <andy@...nel.org>
Acked-by: Andy Shevchenko <andy@...nel.org>
---
 include/linux/string_helpers.h | 4 ++--
 lib/string_helpers.c           | 7 +++----
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h
index c048eaec08..ae4383f0fe 100644
--- a/include/linux/string_helpers.h
+++ b/include/linux/string_helpers.h
@@ -19,8 +19,8 @@ enum string_size_units {
 	STRING_UNITS_2,		/* use binary powers of 2^10 */
 };
 
-void string_get_size(u64 size, u64 blk_size, enum string_size_units units,
-		     char *buf, int len);
+int string_get_size(u64 size, u64 blk_size, enum string_size_units units,
+		    char *buf, int len);
 
 #define UNESCAPE_SPACE		BIT(0)
 #define UNESCAPE_OCTAL		BIT(1)
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index b366c660e6..a48c6a1cdd 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -33,8 +33,8 @@
  * at least 9 bytes and will always be zero terminated.
  *
  */
-void string_get_size(u64 size, u64 blk_size, const enum string_size_units units,
-		     char *buf, int len)
+int string_get_size(u64 size, u64 blk_size, const enum string_size_units units,
+		    char *buf, int len)
 {
 	static const char *const units_10[] = {
 		"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"
@@ -127,8 +127,7 @@ void string_get_size(u64 size, u64 blk_size, const enum string_size_units units,
 	else
 		unit = units_str[units][i];
 
-	snprintf(buf, len, "%u%s %s", (u32)size,
-		 tmp, unit);
+	return snprintf(buf, len, "%u%s %s", (u32)size, tmp, unit);
 }
 EXPORT_SYMBOL(string_get_size);
 
-- 
2.36.1