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Print usage when an unknown option is present

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This commit is contained in:
angt
2015-11-08 17:05:17 +01:00
parent 5bf8e8ea5e
commit 09a27fa817
1 changed files with 37 additions and 8 deletions
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43
glorytun.c
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@@ -523,16 +523,16 @@ static int option_long (void *data, int argc, char **argv)
static int option_option (void *data, int argc, char **argv)
{
struct option *opt = (struct option *)data;
struct option *opts = (struct option *)data;
for (int i=1; i<argc; i++) {
int found = 0;
for (int k=0; opt[k].name; k++) {
if (str_cmp(opt[k].name, argv[i]))
for (int k=0; opts[k].name; k++) {
if (str_cmp(opts[k].name, argv[i]))
continue;
int ret = opt[k].call(opt[k].data, argc-i, &argv[i]);
int ret = opts[k].call(opts[k].data, argc-i, &argv[i]);
if (ret<0)
return -1;
@@ -549,6 +549,32 @@ static int option_option (void *data, int argc, char **argv)
return argc;
}
static void option_usage (struct option *opts, char *name)
{
char *usage = "usage: ";
size_t slen = str_len(usage)+str_len(name);
size_t len = slen;
printf("%s%s", usage, name);
if (slen>40)
slen = 12;
for (int k=0; opts[k].name; k++) {
int isflag = opts[k].call==option_flag;
size_t inc = str_len(opts[k].name)+(isflag?0:4)+4;
if (len+inc>60) {
printf("\n%*s", slen, "");
len = 0;
}
printf(" [%s%s]", opts[k].name, isflag?"":" ARG");
len += inc;
}
printf("\n");
}
static int option (struct option *opts, int argc, char **argv)
{
int ret = option_option(opts, argc, argv);
@@ -556,8 +582,11 @@ static int option (struct option *opts, int argc, char **argv)
if (ret==argc)
return 0;
if (ret>=0)
if (ret<0 || ret+1>=argc)
return 1;
printf("option `%s' is unknown\n", argv[ret+1]);
option_usage(opts, argv[0]);
return 1;
}
@@ -647,10 +676,10 @@ int main (int argc, char **argv)
#endif
struct option opts[] = {
{ "dev", &dev, option_str },
{ "listener", &listener, option_flag },
{ "host", &host, option_str },
{ "port", &port, option_str },
{ "listener", &listener, option_flag },
{ "dev", &dev, option_str },
{ "congestion", &congestion, option_str },
{ "version", &version, option_flag },
{ NULL },