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/*
* Copyright (c) 2008, 2009 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "command-line.h"
#include <getopt.h>
#include <limits.h>
#include <stdlib.h>
#include "util.h"
#include "vlog.h"
/* Given the GNU-style long options in 'options', returns a string that may be
* passed to getopt() with the corresponding short options. The caller is
* responsible for freeing the string. */
char *
long_options_to_short_options(const struct option options[])
{
char short_options[UCHAR_MAX * 3 + 1];
char *p = short_options;
for (; options->name; options++) {
const struct option *o = options;
if (o->flag == NULL && o->val > 0 && o->val <= UCHAR_MAX) {
*p++ = o->val;
if (o->has_arg == required_argument) {
*p++ = ':';
} else if (o->has_arg == optional_argument) {
*p++ = ':';
*p++ = ':';
}
}
}
*p = '\0';
return xstrdup(short_options);
}
/* Runs the command designated by argv[0] within the command table specified by
* 'commands', which must be terminated by a command whose 'name' member is a
* null pointer.
*
* Command-line options should be stripped off, so that a typical invocation
* looks like "run_command(argc - optind, argv + optind, my_commands);". */
void
run_command(int argc, char *argv[], const struct command commands[])
{
const struct command *p;
if (argc < 1) {
ovs_fatal(0, "missing command name; use --help for help");
}
for (p = commands; p->name != NULL; p++) {
if (!strcmp(p->name, argv[0])) {
int n_arg = argc - 1;
if (n_arg < p->min_args) {
ovs_fatal(0, "'%s' command requires at least %d arguments",
p->name, p->min_args);
} else if (n_arg > p->max_args) {
ovs_fatal(0, "'%s' command takes at most %d arguments",
p->name, p->max_args);
} else {
p->handler(argc, argv);
if (ferror(stdout)) {
ovs_fatal(0, "write to stdout failed");
}
if (ferror(stderr)) {
ovs_fatal(0, "write to stderr failed");
}
return;
}
}
}
ovs_fatal(0, "unknown command '%s'; use --help for help", argv[0]);
}
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