linux-kernel - [PATCH] ver_linux: Eliminate duplicate code in ldconfig processing logic

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Date:   Fri,  8 Jan 2021 13:26:26 +0200
From:   Alexander Kapshuk <alexander.kapshuk@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org,
        Alexander Kapshuk <alexander.kapshuk@...il.com>
Subject: [PATCH] ver_linux: Eliminate duplicate code in ldconfig processing logic

The code that acquires the version strings for libc and libcpp is
identical, as is the printversion call. The only difference being the
name of the library being printed.

Refactor the code by unifying the bits that are common to both libraries.

Signed-off-by: Alexander Kapshuk <alexander.kapshuk@...il.com>
---
 scripts/ver_linux | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/scripts/ver_linux b/scripts/ver_linux
index 0968a3070eff..a92acc703f9b 100755
--- a/scripts/ver_linux
+++ b/scripts/ver_linux
@@ -15,7 +15,7 @@ BEGIN {

 	vernum = "[0-9]+([.]?[0-9]+)+"
 	libc = "libc[.]so[.][0-9]+$"
-	libcpp = "(libg|stdc)[+]+[.]so[.][0-9]+$"
+	libcpp = "(libg|stdc)[+]+[.]so([.][0-9]+)+$"

 	printversion("GNU C", version("gcc -dumpversion"))
 	printversion("GNU Make", version("make --version"))
@@ -37,12 +37,10 @@ BEGIN {
 	printversion("Bison", version("bison --version"))
 	printversion("Flex", version("flex --version"))

-	while ("ldconfig -p 2>/dev/null" | getline > 0) {
-		if ($NF ~ libc && !seen[ver = version("readlink " $NF)]++)
-			printversion("Linux C Library", ver)
-		else if ($NF ~ libcpp && !seen[ver = version("readlink " $NF)]++)
-			printversion("Linux C++ Library", ver)
-	}
+	while ("ldconfig -p 2>/dev/null" | getline > 0)
+		if ($NF ~ libc || $NF ~ libcpp)
+			if (!seen[ver = version("readlink " $NF)]++)
+				printversion("Linux C" ($NF ~ libcpp? "++" : "") " Library", ver)

 	printversion("Dynamic linker (ldd)", version("ldd --version"))
 	printversion("Procps", version("ps --version"))
--
2.30.0