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/*

 *  linux/fs/binfmt_script.c

 *

 *  Copyright (C) 1996  Martin von Löwis

 *  original #!-checking implemented by tytso.

 *

 */

/*

 * uClinux revisions for NO_MM

 * Copyright (C) 1998  Kenneth Albanowski <kjahds@kjahds.com>,

 *                     The Silver Hammer Group, Ltd.

 *

 *  FIXME: Modifications are untested!

 */

#include <linux/module.h>

#include <linux/string.h>

#include <linux/stat.h>

#include <linux/malloc.h>

#include <linux/binfmts.h>

static int do_load_script(struct linux_binprm *bprm,struct pt_regs *regs)

{

        char *cp, *interp, *i_name, *i_arg;

        int retval;

        if ((bprm->buf[0] != '#') || (bprm->buf[1] != '!') || (bprm->sh_bang))

                return -ENOEXEC;

        /*

         * This section does the #! interpretation.

         * Sorta complicated, but hopefully it will work.  -TYT

         */

        bprm->sh_bang++;

        iput(bprm->inode);

        bprm->dont_iput=1;

        bprm->buf[127] = '\0';

        if ((cp = strchr(bprm->buf, '\n')) == NULL)

                cp = bprm->buf+127;

        *cp = '\0';

        while (cp > bprm->buf) {

                cp--;

                if ((*cp == ' ') || (*cp == '\t'))

                        *cp = '\0';

                else

                        break;

        }

        for (cp = bprm->buf+2; (*cp == ' ') || (*cp == '\t'); cp++);

        if (!cp || *cp == '\0')

                return -ENOEXEC; /* No interpreter name found */

        interp = i_name = cp;

        i_arg = 0;

        for ( ; *cp && (*cp != ' ') && (*cp != '\t'); cp++) {

                if (*cp == '/')

                        i_name = cp+1;

        }

        while ((*cp == ' ') || (*cp == '\t'))

                *cp++ = '\0';

        if (*cp)

                i_arg = cp;

        /*

         * OK, we've parsed out the interpreter name and

         * (optional) argument.

         * Splice in (1) the interpreter's name for argv[0]

         *           (2) (optional) argument to interpreter

         *           (3) filename of shell script (replace argv[0])

         *

         * This is done in reverse order, because of how the

         * user environment and arguments are stored.

         */

#ifndef NO_MM

        remove_arg_zero(bprm);

        bprm->p = copy_strings(1, &bprm->filename, bprm->page, bprm->p, 2);

        bprm->argc++;

        if (i_arg) {

                bprm->p = copy_strings(1, &i_arg, bprm->page, bprm->p, 2);

                bprm->argc++;

        }

        bprm->p = copy_strings(1, &i_name, bprm->page, bprm->p, 2);

        bprm->argc++;

        if (!bprm->p)

                return -E2BIG;

        /*

         * OK, now restart the process with the interpreter's inode.

         * Note that we use open_namei() as the name is now in kernel

         * space, and we don't need to copy it.

         */

        retval = open_namei(interp, 0, 0, &bprm->inode, NULL);

        if (retval)

                return retval;

        bprm->dont_iput=0;

        retval=prepare_binprm(bprm);

        if(retval<0)

                return retval;

        return search_binary_handler(bprm,regs);

#else /* !NO_MM */

        {

                char ** oldargv = bprm->argv;

                int oldargc = bprm->argc;

                int i;

                bprm->argc = oldargc + (i_arg ? 2 : 1);

                bprm->argv = kmalloc(sizeof(char*) * bprm->argc, GFP_KERNEL);

                if (!bprm->argv) {

                        bprm->argc = oldargc;

                        bprm->argv = oldargv;

                        return -E2BIG;

                }

                for(i=1;i<=oldargc;i++)

                        bprm->argv[bprm->argc-i] = oldargv[oldargc-i];

                bprm->argv[0] = i_name;

                i=1;

                if (i_arg)

                        bprm->argv[i++] = i_arg;

                bprm->argv[i++] = bprm->filename;

                /*

                 * OK, now restart the process with the interpreter's inode.

                 * Note that we use open_namei() as the name is now in kernel

                 * space, and we don't need to copy it.

                 */

                retval = open_namei(interp, 0, 0, &bprm->inode, NULL);

                if (!retval) {

                        bprm->dont_iput=0;

                        retval=prepare_binprm(bprm);

                }

                if (!retval) {

                        retval =  search_binary_handler(bprm,regs);

                }

                kfree(bprm->argv);

                bprm->argv = oldargv;

                bprm->argc = oldargc;

                return retval;

        }

#endif /* !NO_MM */

}

static int load_script(struct linux_binprm *bprm,struct pt_regs *regs)

{

        int retval;

        MOD_INC_USE_COUNT;

        retval = do_load_script(bprm,regs);

        MOD_DEC_USE_COUNT;

        return retval;

}

struct linux_binfmt script_format = {

#ifndef MODULE

        NULL, 0, load_script, NULL, NULL

#else

        NULL, &mod_use_count_, load_script, NULL, NULL

#endif

};

int init_script_binfmt(void) {

        return register_binfmt(&script_format);

}

#ifdef MODULE

int init_module(void)

{

        return init_script_binfmt();

}

void cleanup_module( void) {

        unregister_binfmt(&script_format);

}

#endif