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qemu-io-cmds: Simplify help_oneline

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help_oneline is declared and starts as:

  static void help_oneline(const char *cmd, const cmdinfo_t *ct)
  {
      if (cmd) {
          printf("%s ", cmd);
      } else {
          printf("%s ", ct->name);
          if (ct->altname) {
              printf("(or %s) ", ct->altname);
          }
      }

However, there are only two routes to help_oneline being called:

   help_f -> help_all -> help_oneline(ct->name, ct)

   help_f -> help_onecmd(argv[1], ct)

In the first case, 'cmd' and 'ct->name' are the same thing,
so it's impossible for the if (cmd) to be false and then validly
print ct->name - this is upsetting gcc
( https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96739 )

In the second case, cmd is argv[1] and we know we've got argv[1]
so again (cmd) is non-NULL.

Simplify help_oneline by just printing cmd.
(Also strengthen argc check just to be pedantic)

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20200824102914.105619-1-dgilbert@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2020-08-24 11:29:14 +01:00 committed by Kevin Wolf
parent 8e7b122bf8
commit da16f4b867
1 changed files with 2 additions and 9 deletions
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11
qemu-io-cmds.c
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@ -2383,14 +2383,7 @@ static const cmdinfo_t sleep_cmd = {
static void help_oneline(const char *cmd, const cmdinfo_t *ct) static void help_oneline(const char *cmd, const cmdinfo_t *ct)
{ {
if (cmd) { printf("%s ", cmd);
printf("%s ", cmd);
} else {
printf("%s ", ct->name);
if (ct->altname) {
printf("(or %s) ", ct->altname);
}
}
if (ct->args) { if (ct->args) {
printf("%s ", ct->args); printf("%s ", ct->args);
@ -2420,7 +2413,7 @@ static int help_f(BlockBackend *blk, int argc, char **argv)
{ {
const cmdinfo_t *ct; const cmdinfo_t *ct;
if (argc == 1) { if (argc < 2) {
help_all(); help_all();
return 0; return 0;
} }