From: Denys Vlasenko <dvlasenk@redhat.com>
Date: Fri, 19 Aug 2011 17:44:17 +0000 (+0200)
Subject: Optimize iocb_cmd_lookup
X-Git-Tag: v4.7~321
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=799926211a0343561a92d8fc6dfc87202a136bd0;p=strace

Optimize iocb_cmd_lookup

* desc.c (iocb_cmd_lookup): Make command table constant.
Reduce size of static char buffer.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
---

diff --git a/desc.c b/desc.c
index 9e06b304..00bf37bf 100644
--- a/desc.c
+++ b/desc.c
@@ -823,8 +823,8 @@ enum iocb_sub {
 static const char *
 iocb_cmd_lookup(unsigned cmd, enum iocb_sub *sub)
 {
-	static char buf[64];
-	static struct {
+	static char buf[sizeof("%u /* SUB_??? */") + sizeof(int)*3];
+	static const struct {
 		const char *name;
 		enum iocb_sub sub;
 	} cmds[] = {
@@ -844,7 +844,7 @@ iocb_cmd_lookup(unsigned cmd, enum iocb_sub *sub)
 		return cmds[cmd].name;
 	}
 	*sub = SUB_NONE;
-	snprintf(buf, sizeof(buf), "%u /* SUB_??? */", cmd);
+	sprintf(buf, "%u /* SUB_??? */", cmd);
 	return buf;
 }