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Improve help handling:

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* --help produces long help message on systems with getopt_long
   * -h with no other options also produces long help message
     (If a mode is specified, -h has its usual meaning.)
This commit is contained in:
Tim Kientzle 2004-06-02 21:01:27 +00:00
parent 493db0bf12
commit 755e3f9b2e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=130012
1 changed files with 13 additions and 0 deletions
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13
usr.bin/tar/bsdtar.c
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@ -122,6 +122,7 @@ main(int argc, char **argv)
int opt;
char mode;
char buff[16];
char possible_help_request;
/*
* Use a pointer for consistency, but stack-allocated storage
@ -134,6 +135,7 @@ main(int argc, char **argv)
if (setlocale(LC_ALL, "") == NULL)
bsdtar_warnc(bsdtar, 0, "Failed to set default locale");
mode = '\0';
possible_help_request = 0;
/* Look up uid/uname of current user for future reference */
bsdtar->user_uid = geteuid();
@ -220,6 +222,8 @@ main(int argc, char **argv)
break;
case 'h': /* Linux Standards Base, gtar; synonym for -L */
bsdtar->symlink_mode = 'L';
/* Hack: -h by itself is the "help" command. */
possible_help_request = 1;
break;
#ifdef HAVE_GETOPT_LONG
case OPTION_HELP:
@ -351,6 +355,11 @@ main(int argc, char **argv)
/*
* Sanity-check options.
*/
if (mode == '\0' && possible_help_request) {
long_help(bsdtar);
exit(1);
}
if (mode == '\0')
bsdtar_errc(bsdtar, 1, 0,
"Must specify one of -c, -r, -t, -u, -x");
@ -509,7 +518,11 @@ usage(struct bsdtar *bsdtar)
printf(" List: %s -tf [archive-filename]\n", p);
printf(" Extract: %s -xf [archive-filename]\n", p);
printf(" Create: %s -cf [archive-filename] [filenames...]\n", p);
#ifdef HAVE_GETOPT_LONG
printf(" Help: %s --help\n", p);
#else
printf(" Help: %s -h\n", p);
#endif
exit(1);
}