From ea5b147b305165bf0eb792d4fed99b27aaf9e05c Mon Sep 17 00:00:00 2001
From: Gavin Chou <gavineaglechou@gmail.com>
Date: Wed, 26 Jun 2019 00:37:11 +0800
Subject: [PATCH] Remove GNU sed prerequisite

---
 README.md           |  1 -
 build_call_graph.sh | 10 +++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index dee4f8d..0bfda2d 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,6 @@ will be faded away.
 0. dot - graphviz version 2.41.20190308.1641 (20190308.1641)
 	* new versions should work, if not I will fix it
 	* lower versions may work, but not tested yet, I am lazy...
-1. GNU sed, if you don't have one, modify the build script to fit the purpose
 
 ### usage
 
diff --git a/build_call_graph.sh b/build_call_graph.sh
index a5ff824..4ca77a7 100755
--- a/build_call_graph.sh
+++ b/build_call_graph.sh
@@ -44,8 +44,16 @@ else
 fi
 
 # echo ${out}
+which dot > /dev/null
+if [ $? -ne 0 ]; then
+	echo "no graphviz dot found"
+	exit -1
+fi
 
 dot -Tsvg -o ${out} ${src} > /dev/null
-sed -ri 's#</svg>##' ${out}
+
+sed -i.bak 's#</svg>##' ${out}
+rm -f ${out}.bak
+
 cat "${attach}" >> ${out}
 echo "</svg>" >> ${out}