linux-kernel - [PATCH 11/15] perf tools: Change perf_mem__snp_scnprintf to return nb of displayed bytes

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Message-Id: <1456303616-26926-12-git-send-email-jolsa@kernel.org>
Date:	Wed, 24 Feb 2016 09:46:52 +0100
From:	Jiri Olsa <jolsa@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 11/15] perf tools: Change perf_mem__snp_scnprintf to return nb of displayed bytes

Moving strncat/strcpy calls into scnprintf to easily track
number of displayed bytes. It will be used in following patch.

Link: http://lkml.kernel.org/n/tip-dvtk0c7clgi857x699mk08ya@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/mem-events.c | 9 +++++----
 tools/perf/util/mem-events.h | 2 +-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index cd8241fea081..331cbec5100c 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -209,7 +209,7 @@ static const char * const snoop_access[] = {
 	"HitM",
 };
 
-void perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
+int perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 {
 	size_t i, l = 0;
 	u64 m = PERF_MEM_SNOOP_NA;
@@ -227,12 +227,13 @@ void perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 			strcat(out, " or ");
 			l += 4;
 		}
-		strncat(out, snoop_access[i], sz - l);
-		l += strlen(snoop_access[i]);
+		l += scnprintf(out + l, sz - l, snoop_access[i]);
 	}
 
 	if (*out == '\0')
-		strcpy(out, "N/A");
+		l += scnprintf(out, sz - l, "N/A");
+
+	return l;
 }
 
 void perf_mem__lck_scnprintf(char *out, size_t sz __maybe_unused,
diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
index 9b7a273aeeee..9289db6a6d5b 100644
--- a/tools/perf/util/mem-events.h
+++ b/tools/perf/util/mem-events.h
@@ -28,7 +28,7 @@ char *perf_mem_events__name(int i);
 struct mem_info;
 int perf_mem__tlb_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
 int perf_mem__lvl_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
-void perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
+int perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
 void perf_mem__lck_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
 
 #endif /* __PERF_MEM_EVENTS_H */
-- 
2.4.3