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fdtdump: make usage a bit more friendly

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This starts a new usage framework and then cuts fdtdump over to it.
Now we can do `fdtdump -h` and get something useful back.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Mike Frysinger 2013-04-15 22:13:12 -04:00 • committed by David Gibson
parent 4e76ec796c
commit be8d1c82cb
3 changed files with 138 additions and 8 deletions
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54
util.c
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@ -392,3 +392,57 @@ void util_version(void)
printf("Version: %s\n", DTC_VERSION);
exit(0);
}
void util_long_usage(const char *errmsg, const char *synopsis,
const char *short_opts, struct option const long_opts[],
const char * const opts_help[])
{
FILE *fp = errmsg ? stderr : stdout;
const char a_arg[] = "<arg>";
size_t a_arg_len = strlen(a_arg) + 1;
size_t i;
int optlen;
fprintf(fp,
"Usage: %s\n"
"\n"
"Options: -[%s]\n", synopsis, short_opts);
/* prescan the --long opt length to auto-align */
optlen = 0;
for (i = 0; long_opts[i].name; ++i) {
/* +1 is for space between --opt and help text */
int l = strlen(long_opts[i].name) + 1;
if (long_opts[i].has_arg == a_argument)
l += a_arg_len;
if (optlen < l)
optlen = l;
}
for (i = 0; long_opts[i].name; ++i) {
/* helps when adding new applets or options */
assert(opts_help[i] != NULL);
/* first output the short flag if it has one */
if (long_opts[i].val > '~')
fprintf(fp, " ");
else
fprintf(fp, " -%c, ", long_opts[i].val);
/* then the long flag */
if (long_opts[i].has_arg == no_argument)
fprintf(fp, "--%-*s", optlen, long_opts[i].name);
else
fprintf(fp, "--%s %s%*s", long_opts[i].name, a_arg,
(int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
/* finally the help text */
fprintf(fp, "%s\n", opts_help[i]);
}
if (errmsg) {
fprintf(fp, "\nError: %s\n", errmsg);
exit(EXIT_FAILURE);
} else
exit(EXIT_SUCCESS);
}