1 files changed, 193 insertions, 0 deletions

diff --git a/busybox/applets/busybox.c b/busybox/applets/busybox.c
new file mode 100644
index 000000000..dbb5e176b
--- /dev/null
+++ b/busybox/applets/busybox.c
@@ -0,0 +1,193 @@
+/* vi: set sw=4 ts=4: */
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include "busybox.h"
+#ifdef CONFIG_LOCALE_SUPPORT
+#include <locale.h>
+#endif
+
+int been_there_done_that = 0; /* Also used in applets.c */
+const char *bb_applet_name;
+
+#ifdef CONFIG_FEATURE_INSTALLER
+/*
+ * directory table
+ *              this should be consistent w/ the enum, busybox.h::Location,
+ *              or else...
+ */
+static const char usr_bin [] ="/usr/bin";
+static const char usr_sbin[] ="/usr/sbin";
+
+static const char* const install_dir[] = {
+        &usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
+        &usr_bin [4], /* "/bin" */
+        &usr_sbin[4], /* "/sbin" */
+        usr_bin,
+        usr_sbin
+};
+
+/* abstract link() */
+typedef int (*__link_f)(const char *, const char *);
+
+/*
+ * Where in the filesystem is this busybox?
+ * [return]
+ *              malloc'd string w/ full pathname of busybox's location
+ *              NULL on failure
+ */
+static inline char *busybox_fullpath(void)
+{
+        return xreadlink("/proc/self/exe");
+}
+
+/* create (sym)links for each applet */
+static void install_links(const char *busybox, int use_symbolic_links)
+{
+        __link_f Link = link;
+
+        char *fpc;
+        int i;
+        int rc;
+
+        if (use_symbolic_links)
+                Link = symlink;
+
+        for (i = 0; applets[i].name != NULL; i++) {
+                fpc = concat_path_file(
+                        install_dir[applets[i].location], applets[i].name);
+                rc = Link(busybox, fpc);
+                if (rc!=0 && errno!=EEXIST) {
+                        bb_perror_msg("%s", fpc);
+                }
+                free(fpc);
+        }
+}
+
+#endif /* CONFIG_FEATURE_INSTALLER */
+
+int main(int argc, char **argv)
+{
+        const char *s;
+
+        bb_applet_name = argv[0];
+
+        if (bb_applet_name[0] == '-')
+                bb_applet_name++;
+
+        for (s = bb_applet_name; *s != '\0';) {
+                if (*s++ == '/')
+                        bb_applet_name = s;
+        }
+
+#ifdef CONFIG_LOCALE_SUPPORT
+#ifdef CONFIG_INIT
+        if(getpid()!=1) /* Do not set locale for `init' */
+#endif
+        {
+                setlocale(LC_ALL, "");
+        }
+#endif
+
+        run_applet_by_name(bb_applet_name, argc, argv);
+        bb_error_msg_and_die("applet not found");
+}
+
+
+int busybox_main(int argc, char **argv)
+{
+        int col = 0, len, i;
+
+#ifdef CONFIG_FEATURE_INSTALLER
+        /*
+         * This style of argument parsing doesn't scale well
+         * in the event that busybox starts wanting more --options.
+         * If someone has a cleaner approach, by all means implement it.
+         */
+        if (argc > 1 && (strcmp(argv[1], "--install") == 0)) {
+                int use_symbolic_links = 0;
+                int rc = 0;
+                char *busybox;
+
+                /* to use symlinks, or not to use symlinks... */
+                if (argc > 2) {
+                        if ((strcmp(argv[2], "-s") == 0)) {
+                                use_symbolic_links = 1;
+                        }
+                }
+
+                /* link */
+                busybox = busybox_fullpath();
+                if (busybox) {
+                        install_links(busybox, use_symbolic_links);
+                        free(busybox);
+                } else {
+                        rc = 1;
+                }
+                return rc;
+        }
+#endif /* CONFIG_FEATURE_INSTALLER */
+
+        argc--;
+
+        /* If we've already been here once, exit now */
+        if (been_there_done_that == 1 || argc < 1) {
+                const struct BB_applet *a = applets;
+                int output_width = 60;
+
+#ifdef CONFIG_FEATURE_AUTOWIDTH
+                /* Obtain the terminal width.  */
+                get_terminal_width_height(0, &output_width, NULL);
+                /* leading tab and room to wrap */
+                output_width -= 20;
+#endif
+
+                fprintf(stderr, "%s\n\n"
+                                "Usage: busybox [function] [arguments]...\n"
+                                "   or: [function] [arguments]...\n\n"
+                                "\tBusyBox is a multi-call binary that combines many common Unix\n"
+                                "\tutilities into a single executable.  Most people will create a\n"
+                                "\tlink to busybox for each function they wish to use, and BusyBox\n"
+                                "\twill act like whatever it was invoked as.\n"
+                                "\nCurrently defined functions:\n", bb_msg_full_version);
+
+                while (a->name != 0) {
+                        col +=
+                                fprintf(stderr, "%s%s", ((col == 0) ? "\t" : ", "),
+                                                (a++)->name);
+                        if (col > output_width && a->name != 0) {
+                                fprintf(stderr, ",\n");
+                                col = 0;
+                        }
+                }
+                fprintf(stderr, "\n\n");
+                exit(0);
+        }
+
+        /* Flag that we've been here already */
+        been_there_done_that = 1;
+
+        /* Move the command line down a notch */
+        /* Preserve pointers so setproctitle() works consistently */
+        len = argv[argc] + strlen(argv[argc]) - argv[1];
+        memmove(argv[0], argv[1], len);
+        memset(argv[0] + len, 0, argv[1] - argv[0]);
+
+        /* Fix up the argv pointers */
+        len = argv[1] - argv[0];
+        memmove(argv, argv + 1, sizeof(char *) * (argc + 1));
+        for (i = 0; i < argc; i++)
+                argv[i] -= len;
+
+        return (main(argc, argv));
+}
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/