hush: support ${VAR:N:-M}

[oweals/busybox.git] / applets / usage.c

diff --git a/applets/usage.c b/applets/usage.c
index 4955839fc03951d7a02309b94f7cba52d876bcaf..94520ff66fa581e94e48e8fc2c77836e61b425f4 100644 (file)
--- a/applets/usage.c
+++ b/applets/usage.c
@@ -1,18 +1,55 @@
 /* vi: set sw=4 ts=4: */
+/*
+ * Copyright (C) 2008 Denys Vlasenko.
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
 #include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
 
-/* Just #include "autoconf.h" doesn't work for builds in separate
- * object directory */
-#include "../include/autoconf.h"
+#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
 
-static const char usage_messages[] = ""
-#define MAKE_USAGE
 #include "usage.h"
+#define MAKE_USAGE(aname, usage) { aname, usage },
+static struct usage_data {
+       const char *aname;
+       const char *usage;
+} usage_array[] = {
 #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)
 {
-       write(1, usage_messages, sizeof(usage_messages));
+       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;
 }