busybox/applets/usage.c

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/* vi: set sw=4 ts=4: */
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/*
* Copyright (C) 2008 Denys Vlasenko.
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
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#include "autoconf.h"
/* Since we can't use platform.h, have to do this again by hand: */
#if ENABLE_NOMMU
# define BB_MMU 0
# define USE_FOR_NOMMU(...) __VA_ARGS__
# define USE_FOR_MMU(...)
#else
# define BB_MMU 1
# define USE_FOR_NOMMU(...)
# define USE_FOR_MMU(...) __VA_ARGS__
#endif
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#include "usage.h"
#define MAKE_USAGE(aname, usage) { aname, usage },
static struct usage_data {
const char *aname;
const char *usage;
} usage_array[] = {
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#include "applets.h"
};
static int compare_func(const void *a, const void *b)
{
const struct usage_data *ua = a;
const struct usage_data *ub = b;
return strcmp(ua->aname, ub->aname);
}
int main(void)
{
int i;
int num_messages = sizeof(usage_array) / sizeof(usage_array[0]);
if (num_messages == 0)
return 0;
qsort(usage_array,
num_messages, sizeof(usage_array[0]),
compare_func);
for (i = 0; i < num_messages; i++)
write(STDOUT_FILENO, usage_array[i].usage, strlen(usage_array[i].usage) + 1);
return 0;
}