Archipelago » qemu

#define ARG(n) tget32(args + (n) * 4)

#define SET_ARG(n, val) tput32(args + (n) * 4,val)

        /* Build a commandline from the original argv.  */

        {

            char **arg = ts->info->host_argv;

            int len = ARG(1);

            /* lock the buffer on the ARM side */

            char *cmdline_buffer = (char*)lock_user(ARG(0), len, 0);

            s = cmdline_buffer;

            while (*arg && len > 2) {

                int n = strlen(*arg);

                if (s != cmdline_buffer) {

                    *(s++) = ' ';

                    len--;

                }

                if (n >= len)

                    n = len - 1;

                memcpy(s, *arg, n);

                s += n;

                len -= n;

                arg++;

            }

            /* Null terminate the string.  */

            *s = 0;

            len = s - cmdline_buffer;

            /* Unlock the buffer on the ARM side.  */

            unlock_user(cmdline_buffer, ARG(0), len);

            /* Adjust the commandline length argument.  */

            SET_ARG(1, len);

            /* Return success if commandline fit into buffer.  */

            return *arg ? -1 : 0;

        }