perf tools: Change perf_mem__lck_scnprintf to return nb of displayed bytes

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

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1456303616-26926-13-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index de981dd..eadb83d 100644 (file)
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -221,18 +221,20 @@ int perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
        return l;
 }
 
-void perf_mem__lck_scnprintf(char *out, size_t sz __maybe_unused,
-                            struct mem_info *mem_info)
+int perf_mem__lck_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 {
        u64 mask = PERF_MEM_LOCK_NA;
+       int l;
 
        if (mem_info)
                mask = mem_info->data_src.mem_lock;
 
        if (mask & PERF_MEM_LOCK_NA)
-               strncat(out, "N/A", 3);
+               l = scnprintf(out, sz, "N/A");
        else if (mask & PERF_MEM_LOCK_LOCKED)
-               strncat(out, "Yes", 3);
+               l = scnprintf(out, sz, "Yes");
        else
-               strncat(out, "No", 2);
+               l = scnprintf(out, sz, "No");
+
+       return l;
 }

diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
index 84c79a4..87c44ff 100644 (file)
--- a/tools/perf/util/mem-events.h
+++ b/tools/perf/util/mem-events.h
@@ -28,6 +28,6 @@ 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);
 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);
+int perf_mem__lck_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
 
 #endif /* __PERF_MEM_EVENTS_H */