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Factor out common code from utilities that multiplex commands.

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An upcoming commit will add yet another such utility and the code
redundancy was getting to be a bit much.
This commit is contained in:
Ben Pfaff
2009-10-23 11:49:39 -07:00
parent 29d4af6016
commit 675febfa2f
4 changed files with 89 additions and 117 deletions
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42
lib/command-line.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2008 Nicira Networks.
* 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.
@@ -18,6 +18,7 @@
#include "command-line.h"
#include <getopt.h>
#include <limits.h>
#include <stdlib.h>
#include "util.h"
#include "vlog.h"
@@ -47,3 +48,42 @@ long_options_to_short_options(const struct option options[])
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]);
}