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perf ui helpline: Use strlcpy() as a shorter form of strncpy() + explicit set nul
commit4d0f16d059
upstream. The strncpy() function may leave the destination string buffer unterminated, better use strlcpy() that we have a __weak fallback implementation for systems without it. In this case we are actually setting the null byte at the right place, but since we pass the buffer size as the limit to strncpy() and not it minus one, gcc ends up warning us about that, see below. So, lets just switch to the shorter form provided by strlcpy(). This fixes this warning on an Alpine Linux Edge system with gcc 8.2: ui/tui/helpline.c: In function 'tui_helpline__push': ui/tui/helpline.c:27:2: error: 'strncpy' specified bound 512 equals destination size [-Werror=stringop-truncation] strncpy(ui_helpline__current, msg, sz)[sz - 1] = '\0'; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Fixes:e6e9046879
("perf ui: Introduce struct ui_helpline") Link: https://lkml.kernel.org/n/tip-d1wz0hjjsh19xbalw69qpytj@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -24,7 +24,7 @@ static void tui_helpline__push(const char *msg)
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SLsmg_set_color(0);
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SLsmg_write_nstring((char *)msg, SLtt_Screen_Cols);
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SLsmg_refresh();
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strncpy(ui_helpline__current, msg, sz)[sz - 1] = '\0';
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strlcpy(ui_helpline__current, msg, sz);
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}
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static int tui_helpline__show(const char *format, va_list ap)
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