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perf stat: Enhance option parse error message

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Print related option help messages only when it failed to process
options.  While at it, modify parse_options_usage() to skip usage part
so that it can be used for showing multiple option help messages
naturally like below:

  $ perf stat -Bx, ls
  -B option not supported with -x

   usage: perf stat [<options>] [<command>]

      -B, --big-num         print large numbers with thousands' separators
      -x, --field-separator <separator>
                            print counts with custom separator

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Enthusiastically-Supported-by: Ingo Molnar <mingo@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1383291195-24386-6-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
2013-11-01 16:33:15 +09:00
committed by Arnaldo Carvalho de Melo
parent d37a92dcb4
commit cc03c54296
2 changed files with 29 additions and 16 deletions
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3
tools/perf/util/parse-options.c
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@@ -569,7 +569,7 @@ int parse_options_usage(const char * const *usagestr,
const char *optstr, bool short_opt)
{
if (!usagestr)
return PARSE_OPT_HELP;
goto opt;
fprintf(stderr, "\n usage: %s\n", *usagestr++);
while (*usagestr && **usagestr)
@@ -582,6 +582,7 @@ int parse_options_usage(const char * const *usagestr,
}
fputc('\n', stderr);
opt:
for ( ; opts->type != OPTION_END; opts++) {
if (short_opt) {
if (opts->short_name == *optstr)