From: Alejandro Colomar <alx.manpages@gmail.com>
Date: Sun, 14 Nov 2021 13:54:24 +0000 (+0100)
Subject: bash_aliases: grep_*(): Optimize
X-Git-Tag: man-pages-5.19-rc1~833
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2823cdab8888171e4fc8523f5d08f080487009cc;p=thirdparty%2Fman-pages.git

bash_aliases: grep_*(): Optimize

Using grep first to reduce the files on which pcregrep is run
optimizes considerably the performance of these functions.

If a file doesn't contain the name of a function,
which can easily be checked with grep,
it won't possibly contain the function prototype or definition,
which is much slower to search,
since it implies multiline pcregrep search.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
---

diff --git a/scripts/bash_aliases b/scripts/bash_aliases
index be0672595a..e9f63b1519 100644
--- a/scripts/bash_aliases
+++ b/scripts/bash_aliases
@@ -52,12 +52,14 @@ function grep_syscall()
 
 	find * -type f \
 	|grep '\.c$' \
+	|xargs grep -l "${1}" \
 	|sort \
 	|xargs pcregrep -Mn "(?s)^\w*SYSCALL_DEFINE.\(${1},.*?\)" \
 	|sed -E 's/^[^:]+:[0-9]+:/&\n/';
 
 	find * -type f \
 	|grep '\.[ch]$' \
+	|xargs grep -l "${1}" \
 	|sort \
 	|xargs pcregrep -Mn "(?s)^asmlinkage\s+[\w\s]+\**sys_${1}\s*\(.*?\)" \
 	|sed -E 's/^[^:]+:[0-9]+:/&\n/';
@@ -77,6 +79,7 @@ function grep_syscall_def()
 
 	find * -type f \
 	|grep '\.c$' \
+	|xargs grep -l "${1}" \
 	|sort \
 	|xargs pcregrep -Mn "(?s)^\w*SYSCALL_DEFINE.\(${1},.*?^}" \
 	|sed -E 's/^[^:]+:[0-9]+:/&\n/';
@@ -216,6 +219,7 @@ function grep_glibc_prototype()
 
 	find * -type f \
 	|grep '\.h$' \
+	|xargs grep -l "${1}" \
 	|sort \
 	|xargs pcregrep -Mn \
 	  "(?s)^[\w[][\w\s(,)[:\]]+\s+\**${1}\s*\([\w\s(,)[\]*]+?(...)?\)[\w\s(,)[:\]]*;" \