[tip:perf/core] perf help: Remove needless use of strncpy()

From: tip-bot for Arnaldo Carvalho de Melo
Date: Tue Dec 18 2018 - 09:22:31 EST

Commit-ID: b6313899f4ed2e76b8375cf8069556f5b94fbff0
Gitweb: https://git.kernel.org/tip/b6313899f4ed2e76b8375cf8069556f5b94fbff0
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Thu, 6 Dec 2018 11:20:21 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 17 Dec 2018 14:59:18 -0300

perf help: Remove needless use of strncpy()

Since we make sure the destination buffer has at least strlen(orig) + 1,
no need to do a strncpy(dest, orig, strlen(orig)), just use strcpy(dest,

This silences this gcc 8.2 warning on Alpine Linux:

In function 'add_man_viewer',
inlined from 'perf_help_config' at builtin-help.c:284:3:
builtin-help.c:192:2: error: 'strncpy' output truncated before terminating nul copying as many bytes from a string as its length [-Werror=stringop-truncation]
strncpy((*p)->name, name, len);
builtin-help.c: In function 'perf_help_config':
builtin-help.c:187:15: note: length computed here
size_t len = strlen(name);

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Fixes: 078006012401 ("perf_counter tools: add in basic glue from Git")
Link: https://lkml.kernel.org/n/tip-2f69l7drca427ob4km8i7kvo@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
tools/perf/builtin-help.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
index 1c41b4eaf73c..3d29d0524a89 100644
--- a/tools/perf/builtin-help.c
+++ b/tools/perf/builtin-help.c
@@ -189,7 +189,7 @@ static void add_man_viewer(const char *name)
while (*p)
p = &((*p)->next);
*p = zalloc(sizeof(**p) + len + 1);
- strncpy((*p)->name, name, len);
+ strcpy((*p)->name, name);

static int supported_man_viewer(const char *name, size_t len)