gui.c

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/*
 * Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
 * Copyright 2004-2008 James Bursa <bursa@users.sourceforge.net>
 * Copyright 2003 John M Bell <jmb202@ecs.soton.ac.uk>
 * Copyright 2005 Richard Wilson <info@tinct.net>
 * Copyright 2004 Andrew Timmins <atimmins@blueyonder.co.uk>
 * Copyright 2004-2009 John Tytgat <joty@netsurf-browser.org>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include <stdbool.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <unixlib/local.h>
#include <fpu_control.h>
#include <oslib/help.h>
#include <oslib/uri.h>
#include <oslib/inetsuite.h>
#include <oslib/pdriver.h>
#include <oslib/osfile.h>
#include <oslib/hourglass.h>
#include <oslib/osgbpb.h>
#include <oslib/osbyte.h>
#include <oslib/osmodule.h>
#include <oslib/osfscontrol.h>
 
#include "utils/utils.h"
#include "utils/nsoption.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/file.h"
#include "utils/filename.h"
#include "utils/url.h"
#include "utils/corestrings.h"
#include "netsurf/fetch.h"
#include "netsurf/misc.h"
#include "netsurf/content.h"
#include "netsurf/netsurf.h"
#include "netsurf/browser_window.h"
#include "netsurf/cookie_db.h"
#include "netsurf/url_db.h"
#include "desktop/save_complete.h"
#include "desktop/hotlist.h"
#include "content/backing_store.h"
 
#include "riscos/gui.h"
#include "riscos/bitmap.h"
#include "riscos/wimputils.h"
#include "riscos/hotlist.h"
#include "riscos/buffer.h"
#include "riscos/textselection.h"
#include "riscos/print.h"
#include "riscos/save.h"
#include "riscos/dialog.h"
#include "riscos/wimp.h"
#include "riscos/message.h"
#include "riscos/help.h"
#include "riscos/query.h"
#include "riscos/window.h"
#include "riscos/iconbar.h"
#include "riscos/local_history.h"
#include "riscos/global_history.h"
#include "riscos/cookies.h"
#include "riscos/pageinfo.h"
#include "riscos/wimp_event.h"
#include "riscos/uri.h"
#include "riscos/url_protocol.h"
#include "riscos/mouse.h"
#include "riscos/ucstables.h"
#include "riscos/filetype.h"
#include "riscos/font.h"
#include "riscos/toolbar.h"
#include "riscos/content-handlers/artworks.h"
#include "riscos/content-handlers/draw.h"
#include "riscos/content-handlers/sprite.h"
 
bool riscos_done = false;
 
extern bool ro_plot_patterned_lines;
 
int os_version = 0;
bool os_alpha_sprite_supported = false;
 
const char * const __dynamic_da_name = "NetSurf";       /**< For UnixLib. */
int __dynamic_da_max_size = 128 * 1024 * 1024;  /**< For UnixLib. */
int __feature_imagefs_is_file = 1;              /**< For UnixLib. */
/* default filename handling */
int __riscosify_control = __RISCOSIFY_NO_SUFFIX |
                        __RISCOSIFY_NO_REVERSE_SUFFIX;
#ifndef __ELF__
extern int __dynamic_num;
#endif
 
const char * NETSURF_DIR;
 
static const char *task_name = "NetSurf";
#define CHOICES_PREFIX "<Choices$Write>.WWW.NetSurf."
 
ro_gui_drag_type gui_current_drag_type;
wimp_t task_handle; /**< RISC OS wimp task handle. */
static clock_t gui_last_poll; /**< Time of last wimp_poll. */
osspriteop_area *gui_sprites; /**< Sprite area containing pointer and hotlist sprites */
 
#define DIR_SEP ('.')
 
/**
 * Accepted wimp user messages.
 */
static ns_wimp_message_list task_messages = {
        message_HELP_REQUEST,
        {
                message_DATA_SAVE,
                message_DATA_SAVE_ACK,
                message_DATA_LOAD,
                message_DATA_LOAD_ACK,
                message_DATA_OPEN,
                message_PRE_QUIT,
                message_SAVE_DESKTOP,
                message_MENU_WARNING,
                message_MENUS_DELETED,
                message_WINDOW_INFO,
                message_CLAIM_ENTITY,
                message_DATA_REQUEST,
                message_DRAGGING,
                message_DRAG_CLAIM,
                message_MODE_CHANGE,
                message_PALETTE_CHANGE,
                message_FONT_CHANGED,
                message_URI_PROCESS,
                message_URI_RETURN_RESULT,
                message_INET_SUITE_OPEN_URL,
                message_PRINT_SAVE,
                message_PRINT_ERROR,
                message_PRINT_TYPE_ODD,
                message_HOTLIST_ADD_URL,
                message_HOTLIST_CHANGED,
                0
        }
};
 
 
static struct
{
        int width; /* in OS units */
        int height;
} screen_info;
 
 
/**
 * Callback to translate resource to full url for RISC OS.
 *
 * Transforms a resource: path into a full URL. The returned URL is
 * used as the target for a redirect. The caller takes ownership of
 * the returned nsurl including unrefing it when finished with it.
 *
 * \param path The path of the resource to locate.
 * \return A string containing the full URL of the target object or
 *         NULL if no suitable resource can be found.
 */
static nsurl *gui_get_resource_url(const char *path)
{
        static const char base_url[] = "file:///NetSurf:/Resources/";
        const char *lang;
        size_t path_len, length;
        char *raw;
        nsurl *url = NULL;
 
        /* Map paths first */
        if (strcmp(path, "adblock.css") == 0) {
                path = "AdBlock";
 
        } else if (strcmp(path, "default.css") == 0) {
                path = "CSS";
 
        } else if (strcmp(path, "quirks.css") == 0) {
                path = "Quirks";
 
        } else if (strcmp(path, "favicon.ico") == 0) {
                path = "Icons/content.png";
 
        } else if (strcmp(path, "user.css") == 0) {
                /* Special case; this file comes from Choices: */
                nsurl_create("file:///Choices:WWW/NetSurf/User", &url);
                return url;
        }
 
        path_len = strlen(path);
 
        lang = ro_gui_default_language();
 
        /* Find max URL length */
        length = SLEN(base_url) +
                        strlen(lang) + 1 + /* <lang> + / */
                        path_len + 1; /* + NUL */
 
        raw = malloc(length);
        if (raw != NULL) {
                /* Insert base URL */
                char *ptr = memcpy(raw, base_url, SLEN(base_url));
                ptr += SLEN(base_url);
 
                /* Add language directory to URL, for translated files */
                /* TODO: handle non-html translated files */
                if (path_len > SLEN(".html") &&
                                strncmp(path + path_len - SLEN(".html"),
                                        ".html", SLEN(".html")) == 0) {
                        ptr += sprintf(ptr, "%s/", lang);
                }
 
                /* Add filename to URL */
                memcpy(ptr, path, path_len);
                ptr += path_len;
 
                /* Terminate string */
                *ptr = '\0';
 
                nsurl_create(raw, &url);
                free(raw);
        }
 
        return url;
}
 
 
/**
 * Set colour option from wimp.
 *
 * \param opts The netsurf options.
 * \param wimp wimp colour value
 * \param option the netsurf option enum.
 * \param def_colour The default colour value to use.
 * \return NSERROR_OK on success or error code.
 */
static nserror
set_colour_from_wimp(struct nsoption_s *opts,
                   wimp_colour wimp,
                   enum nsoption_e option,
                   colour def_colour)
{
        os_error *error;
        os_PALETTE(20) palette;
 
        error = xwimp_read_true_palette((os_palette *) &palette);
        if (error != NULL) {
                NSLOG(netsurf, INFO,
                      "xwimp_read_palette: 0x%x: %s",
                      error->errnum,
                      error->errmess);
        } else {
                /* entries are in B0G0R0LL */
                def_colour = palette.entries[wimp] >> 8;
        }
 
        opts[option].value.c = def_colour;
 
        return NSERROR_OK;
}
 
 
/**
 * Set option defaults for riscos frontend
 *
 * @param defaults The option table to update.
 * @return error status.
 *
 * @todo The wimp_COLOUR_... values here map the colour definitions to
 * parts of the RISC OS desktop palette. In places this is fairly
 * arbitrary, and could probably do with re-checking.
 */
static nserror set_defaults(struct nsoption_s *defaults)
{
        /* Set defaults for absent option strings */
        nsoption_setnull_charp(ca_bundle, strdup("<NetSurf$CABundle>"));
        nsoption_setnull_charp(cookie_file, strdup("NetSurf:Cookies"));
        nsoption_setnull_charp(cookie_jar, strdup(CHOICES_PREFIX "Cookies"));
 
        if (nsoption_charp(ca_bundle) == NULL ||
            nsoption_charp(cookie_file) == NULL ||
            nsoption_charp(cookie_jar) == NULL) {
                NSLOG(netsurf, INFO, "Failed initialising default options");
                return NSERROR_BAD_PARAMETER;
        }
 
        /* RISC OS platform does not generally benefit from disc cache
         * so the default should be off.
         */
        nsoption_set_uint(disc_cache_size, 0);
 
        /* Override core default treeview font size with 12 pt.
         * TODO: 12 is the normal desktop font size, but users might run
         *       with something different.
         */
        nsoption_set_int(treeview_font_size, 12 * 10);
 
        /* set default system colours for riscos ui */
        set_colour_from_wimp(defaults, wimp_COLOUR_BLACK, NSOPTION_sys_colour_ActiveBorder, 0x00000000);
        set_colour_from_wimp(defaults, wimp_COLOUR_CREAM, NSOPTION_sys_colour_ActiveCaption, 0x00dddddd);
        set_colour_from_wimp(defaults, wimp_COLOUR_VERY_LIGHT_GREY, NSOPTION_sys_colour_AppWorkspace, 0x00eeeeee);
        set_colour_from_wimp(defaults, wimp_COLOUR_VERY_LIGHT_GREY, NSOPTION_sys_colour_Background, 0x00aa0000);/* \TODO -- Check */
        set_colour_from_wimp(defaults, wimp_COLOUR_VERY_LIGHT_GREY, NSOPTION_sys_colour_ButtonFace, 0x00aaaaaa);
        set_colour_from_wimp(defaults, wimp_COLOUR_DARK_GREY, NSOPTION_sys_colour_ButtonHighlight, 0x00cccccc);/* \TODO -- Check */
        set_colour_from_wimp(defaults, wimp_COLOUR_MID_DARK_GREY, NSOPTION_sys_colour_ButtonShadow, 0x00bbbbbb);
        set_colour_from_wimp(defaults, wimp_COLOUR_BLACK, NSOPTION_sys_colour_ButtonText, 0x00000000);
        set_colour_from_wimp(defaults, wimp_COLOUR_BLACK, NSOPTION_sys_colour_CaptionText, 0x00000000);
        set_colour_from_wimp(defaults, wimp_COLOUR_MID_LIGHT_GREY, NSOPTION_sys_colour_GrayText, 0x00777777);/* \TODO -- Check */
        set_colour_from_wimp(defaults, wimp_COLOUR_BLACK, NSOPTION_sys_colour_Highlight, 0x00ee0000);
        set_colour_from_wimp(defaults, wimp_COLOUR_WHITE, NSOPTION_sys_colour_HighlightText, 0x00000000);
        set_colour_from_wimp(defaults, wimp_COLOUR_BLACK, NSOPTION_sys_colour_InactiveBorder, 0x00000000);
        set_colour_from_wimp(defaults, wimp_COLOUR_LIGHT_GREY, NSOPTION_sys_colour_InactiveCaption, 0x00ffffff);
        set_colour_from_wimp(defaults, wimp_COLOUR_BLACK, NSOPTION_sys_colour_InactiveCaptionText, 0x00cccccc);
        set_colour_from_wimp(defaults, wimp_COLOUR_CREAM, NSOPTION_sys_colour_InfoBackground, 0x00aaaaaa);
        set_colour_from_wimp(defaults, wimp_COLOUR_BLACK, NSOPTION_sys_colour_InfoText, 0x00000000);
        set_colour_from_wimp(defaults, wimp_COLOUR_WHITE, NSOPTION_sys_colour_Menu, 0x00aaaaaa);
        set_colour_from_wimp(defaults, wimp_COLOUR_BLACK, NSOPTION_sys_colour_MenuText, 0x00000000);
        set_colour_from_wimp(defaults, wimp_COLOUR_LIGHT_GREY, NSOPTION_sys_colour_Scrollbar, 0x00aaaaaa);/* \TODO -- Check */
        set_colour_from_wimp(defaults, wimp_COLOUR_MID_DARK_GREY, NSOPTION_sys_colour_ThreeDDarkShadow, 0x00555555);
        set_colour_from_wimp(defaults, wimp_COLOUR_VERY_LIGHT_GREY, NSOPTION_sys_colour_ThreeDFace, 0x00dddddd);
        set_colour_from_wimp(defaults, wimp_COLOUR_WHITE, NSOPTION_sys_colour_ThreeDHighlight, 0x00aaaaaa);
        set_colour_from_wimp(defaults, wimp_COLOUR_WHITE, NSOPTION_sys_colour_ThreeDLightShadow, 0x00999999);
        set_colour_from_wimp(defaults, wimp_COLOUR_MID_DARK_GREY, NSOPTION_sys_colour_ThreeDShadow, 0x00777777);
        set_colour_from_wimp(defaults, wimp_COLOUR_VERY_LIGHT_GREY, NSOPTION_sys_colour_Window, 0x00aaaaaa);
        set_colour_from_wimp(defaults, wimp_COLOUR_BLACK, NSOPTION_sys_colour_WindowFrame, 0x00000000);
        set_colour_from_wimp(defaults, wimp_COLOUR_BLACK, NSOPTION_sys_colour_WindowText, 0x00000000);
 
        return NSERROR_OK;
}
 
 
 
 
/**
 * Create intermediate directories for Choices and User Data files
 */
static void ro_gui_create_dirs(void)
{
        char buf[256];
        char *path;
 
        /* Choices */
        path = getenv("NetSurf$ChoicesSave");
        if (!path)
                die("Failed to find NetSurf Choices save path");
 
        snprintf(buf, sizeof(buf), "%s", path);
        netsurf_mkdir_all(buf);
 
        /* URL */
        snprintf(buf, sizeof(buf), "%s", nsoption_charp(url_save));
        netsurf_mkdir_all(buf);
 
        /* Hotlist */
        snprintf(buf, sizeof(buf), "%s", nsoption_charp(hotlist_save));
        netsurf_mkdir_all(buf);
 
        /* Recent */
        snprintf(buf, sizeof(buf), "%s", nsoption_charp(recent_save));
        netsurf_mkdir_all(buf);
 
        /* Theme */
        snprintf(buf, sizeof(buf), "%s", nsoption_charp(theme_save));
        netsurf_mkdir_all(buf);
        /* and the final directory part (as theme_save is a directory) */
        xosfile_create_dir(buf, 0);
}
 
 
/**
 * Ensures the gui exits cleanly.
 */
static void ro_gui_cleanup(void)
{
        ro_gui_buffer_close();
        xhourglass_off();
        /* Uninstall NetSurf-specific fonts */
        xos_cli("FontRemove NetSurf:Resources.Fonts.");
}
 
 
/**
 * Handles a signal
 */
static void ro_gui_signal(int sig)
{
        static const os_error error = { 1, "NetSurf has detected a serious "
                        "error and must exit. Please submit a bug report, "
                        "attaching the browser log file." };
        os_colour old_sand, old_glass;
 
        ro_gui_cleanup();
 
        xhourglass_on();
        xhourglass_colours(0x0000ffff, 0x000000ff, &old_sand, &old_glass);
        nsoption_dump(stderr, NULL);
        /*rufl_dump_state();*/
 
#ifndef __ELF__
        /* save WimpSlot and DA to files if NetSurf$CoreDump exists */
        int used;
        xos_read_var_val_size("NetSurf$CoreDump", 0, 0, &used, 0, 0);
        if (used) {
                int curr_slot;
                xwimp_slot_size(-1, -1, &curr_slot, 0, 0);
                NSLOG(netsurf, INFO, "saving WimpSlot, size 0x%x", curr_slot);
                xosfile_save("$.NetSurf_Slot", 0x8000, 0,
                                (byte *) 0x8000,
                                (byte *) 0x8000 + curr_slot);
 
                if (__dynamic_num != -1) {
                        int size;
                        byte *base_address;
                        xosdynamicarea_read(__dynamic_num, &size,
                                        &base_address, 0, 0, 0, 0, 0);
                        NSLOG(netsurf, INFO,
                              "saving DA %i, base %p, size 0x%x",
                              __dynamic_num,
                              base_address,
                              size);
                        xosfile_save("$.NetSurf_DA",
                                        (bits) base_address, 0,
                                        base_address,
                                        base_address + size);
                }
        }
#else
        /* Save WimpSlot and UnixLib managed DAs when UnixEnv$coredump
         * defines a coredump directory.  */
        const _kernel_oserror *err = __unixlib_write_coredump (NULL);
        if (err != NULL)
                NSLOG(netsurf, INFO, "Coredump failed: %s", err->errmess);
#endif
 
        xhourglass_colours(old_sand, old_glass, 0, 0);
        xhourglass_off();
 
        __write_backtrace(sig);
 
        xwimp_report_error_by_category(&error,
                        wimp_ERROR_BOX_GIVEN_CATEGORY |
                        wimp_ERROR_BOX_CATEGORY_ERROR <<
                                wimp_ERROR_BOX_CATEGORY_SHIFT,
                        "NetSurf", "!netsurf",
                        (osspriteop_area *) 1, "Quit", 0);
        xos_cli("Filer_Run <Wimp$ScrapDir>.WWW.NetSurf.Log");
 
        _Exit(sig);
}
 
 
/**
 * Read a "line" from an Acorn URI file.
 *
 * \param fp file pointer to read from
 * \param b buffer for line, size 400 bytes
 * \return true on success, false on EOF
 */
static bool ro_gui_uri_file_parse_line(FILE *fp, char *b)
{
        int c;
        unsigned int i = 0;
 
        c = getc(fp);
        if (c == EOF)
                return false;
 
        /* skip comment lines */
        while (c == '#') {
                do { c = getc(fp); } while (c != EOF && 32 <= c);
                if (c == EOF)
                        return false;
                do { c = getc(fp); } while (c != EOF && c < 32);
                if (c == EOF)
                        return false;
        }
 
        /* read "line" */
        do {
                if (i == 399)
                        return false;
                b[i++] = c;
                c = getc(fp);
        } while (c != EOF && 32 <= c);
 
        /* skip line ending control characters */
        while (c != EOF && c < 32)
                c = getc(fp);
 
        if (c != EOF)
                ungetc(c, fp);
 
        b[i] = 0;
        return true;
}
 
 
/**
 * Parse an Acorn URI file.
 *
 * \param file_name file to read
 * \param uri_title pointer to receive title data, or NULL for no data
 * \return URL from file, or 0 on error and error reported
 */
static char *ro_gui_uri_file_parse(const char *file_name, char **uri_title)
{
        /* See the "Acorn URI Handler Functional Specification" for the
         * definition of the URI file format. */
        char line[400];
        char *url = NULL;
        FILE *fp;
 
        *uri_title = NULL;
        fp = fopen(file_name, "rb");
        if (!fp) {
                NSLOG(netsurf, INFO, "fopen(\"%s\", \"rb\"): %i: %s",
                      file_name, errno, strerror(errno));
                ro_warn_user("LoadError", strerror(errno));
                return 0;
        }
 
        /* "URI" */
        if (!ro_gui_uri_file_parse_line(fp, line) || strcmp(line, "URI") != 0)
                goto uri_syntax_error;
 
        /* version */
        if (!ro_gui_uri_file_parse_line(fp, line) ||
                        strspn(line, "0123456789") != strlen(line))
                goto uri_syntax_error;
 
        /* URI */
        if (!ro_gui_uri_file_parse_line(fp, line))
                goto uri_syntax_error;
 
        url = strdup(line);
        if (!url) {
                ro_warn_user("NoMemory", 0);
                fclose(fp);
                return 0;
        }
 
        /* title */
        if (!ro_gui_uri_file_parse_line(fp, line))
                goto uri_free;
        if (uri_title && line[0] && ((line[0] != '*') || line[1])) {
                *uri_title = strdup(line);
                if (!*uri_title) /* non-fatal */
                        ro_warn_user("NoMemory", 0);
        }
        fclose(fp);
 
        return url;
 
uri_free:
        free(url);
 
uri_syntax_error:
        fclose(fp);
        ro_warn_user("URIError", 0);
        return 0;
}
 
 
/**
 * Parse an ANT URL file.
 *
 * \param  file_name  file to read
 * \return  URL from file, or 0 on error and error reported
 */
static char *ro_gui_url_file_parse(const char *file_name)
{
        char line[400];
        char *url;
        FILE *fp;
 
        fp = fopen(file_name, "r");
        if (!fp) {
                NSLOG(netsurf, INFO, "fopen(\"%s\", \"r\"): %i: %s",
                      file_name, errno, strerror(errno));
                ro_warn_user("LoadError", strerror(errno));
                return 0;
        }
 
        if (!fgets(line, sizeof line, fp)) {
                if (ferror(fp)) {
                        NSLOG(netsurf, INFO, "fgets: %i: %s", errno,
                              strerror(errno));
                        ro_warn_user("LoadError", strerror(errno));
                } else
                        ro_warn_user("LoadError", messages_get("EmptyError"));
                fclose(fp);
                return 0;
        }
 
        fclose(fp);
 
        if (line[strlen(line) - 1] == '\n')
                line[strlen(line) - 1] = '\0';
 
        url = strdup(line);
        if (!url) {
                ro_warn_user("NoMemory", 0);
                return 0;
        }
 
        return url;
}
 
 
/**
 * Parse an IEURL file.
 *
 * \param  file_name  file to read
 * \return  URL from file, or 0 on error and error reported
 */
static char *ro_gui_ieurl_file_parse(const char *file_name)
{
        char line[400];
        char *url = 0;
        FILE *fp;
 
        fp = fopen(file_name, "r");
        if (!fp) {
                NSLOG(netsurf, INFO, "fopen(\"%s\", \"r\"): %i: %s",
                      file_name, errno, strerror(errno));
                ro_warn_user("LoadError", strerror(errno));
                return 0;
        }
 
        while (fgets(line, sizeof line, fp)) {
                if (strncmp(line, "URL=", 4) == 0) {
                        if (line[strlen(line) - 1] == '\n')
                                line[strlen(line) - 1] = '\0';
                        url = strdup(line + 4);
                        if (!url) {
                                fclose(fp);
                                ro_warn_user("NoMemory", 0);
                                return 0;
                        }
                        break;
                }
        }
        if (ferror(fp)) {
                NSLOG(netsurf, INFO, "fgets: %i: %s", errno, strerror(errno));
                ro_warn_user("LoadError", strerror(errno));
                fclose(fp);
                return 0;
        }
 
        fclose(fp);
 
        if (!url)
                ro_warn_user("URIError", 0);
 
        return url;
}
 
 
/**
 * Handle Message_DataOpen (double-click on file in the Filer).
 *
 * \param message The wimp message to open.
 */
static void ro_msg_dataopen(wimp_message *message)
{
        int file_type = message->data.data_xfer.file_type;
        char *url = 0;
        os_error *oserror;
        nsurl *urlns;
        nserror error;
        size_t len;
 
        switch (file_type) {
        case 0xb28:                     /* ANT URL file */
                url = ro_gui_url_file_parse(message->data.data_xfer.file_name);
                error = nsurl_create(url, &urlns);
                free(url);
                break;
 
        case 0xfaf:             /* HTML file */
                error = netsurf_path_to_nsurl(message->data.data_xfer.file_name,
                                              &urlns);
                break;
 
        case 0x1ba:             /* IEURL file */
                url = ro_gui_ieurl_file_parse(message->
                                data.data_xfer.file_name);
                error = nsurl_create(url, &urlns);
                free(url);
                break;
 
        case 0x2000:            /* application */
                len = strlen(message->data.data_xfer.file_name);
                if (len < 9 || strcmp(".!NetSurf",
                                message->data.data_xfer.file_name + len - 9))
                        return;
 
                if (nsoption_charp(homepage_url) &&
                    nsoption_charp(homepage_url)[0]) {
                        error = nsurl_create(nsoption_charp(homepage_url),
                                             &urlns);
                } else {
                        error = nsurl_create(NETSURF_HOMEPAGE, &urlns);
                }
                break;
 
        default:
                return;
        }
 
        /* send DataLoadAck */
        message->action = message_DATA_LOAD_ACK;
        message->your_ref = message->my_ref;
        oserror = xwimp_send_message(wimp_USER_MESSAGE, message, message->sender);
        if (oserror) {
                NSLOG(netsurf, INFO, "xwimp_send_message: 0x%x: %s",
                      oserror->errnum, oserror->errmess);
                ro_warn_user("WimpError", oserror->errmess);
                return;
        }
 
        if (error != NSERROR_OK) {
                ro_warn_user(messages_get_errorcode(error), 0);
                return;
        }
 
        /* create a new window with the file */
        error = browser_window_create(BW_CREATE_HISTORY,
                                      urlns,
                                      NULL,
                                      NULL,
                                      NULL);
        nsurl_unref(urlns);
        if (error != NSERROR_OK) {
                ro_warn_user(messages_get_errorcode(error), 0);
        }
}
 
 
/**
 * Handle Message_DataLoad (file dragged in).
 */
static void ro_msg_dataload(wimp_message *message)
{
        int file_type = message->data.data_xfer.file_type;
        char *urltxt = NULL;
        char *title = NULL;
        struct gui_window *g;
        os_error *oserror;
        nsurl *url;
        nserror error;
 
        g = ro_gui_window_lookup(message->data.data_xfer.w);
        if (g) {
                if (ro_gui_window_dataload(g, message))
                        return;
        }
        else {
                g = ro_gui_toolbar_lookup(message->data.data_xfer.w);
                if (g && ro_gui_toolbar_dataload(g, message))
                        return;
        }
 
        switch (file_type) {
                case FILETYPE_ACORN_URI:
                        urltxt = ro_gui_uri_file_parse(message->data.data_xfer.file_name,
                                        &title);
                        error = nsurl_create(urltxt, &url);
                        free(urltxt);
                        break;
 
                case FILETYPE_ANT_URL:
                        urltxt = ro_gui_url_file_parse(message->data.data_xfer.file_name);
                        error = nsurl_create(urltxt, &url);
                        free(urltxt);
                        break;
 
                case FILETYPE_IEURL:
                        urltxt = ro_gui_ieurl_file_parse(message->data.data_xfer.file_name);
                        error = nsurl_create(urltxt, &url);
                        free(urltxt);
                        break;
 
                case FILETYPE_HTML:
                case FILETYPE_JNG:
                case FILETYPE_CSS:
                case FILETYPE_MNG:
                case FILETYPE_GIF:
                case FILETYPE_BMP:
                case FILETYPE_ICO:
                case osfile_TYPE_DRAW:
                case FILETYPE_PNG:
                case FILETYPE_JPEG:
                case osfile_TYPE_SPRITE:
                case osfile_TYPE_TEXT:
                case FILETYPE_ARTWORKS:
                case FILETYPE_SVG:
                case FILETYPE_WEBP:
                        /* display the actual file */
                        error = netsurf_path_to_nsurl(message->data.data_xfer.file_name, &url);
                        break;
 
                default:
                        return;
        }
 
        /* report error to user */
        if (error != NSERROR_OK) {
                ro_warn_user(messages_get_errorcode(error), 0);
                return;
        }
 
 
        if (g) {
                error = browser_window_navigate(g->bw,
                                                url,
                                                NULL,
                                                BW_NAVIGATE_HISTORY,
                                                NULL,
                                                NULL,
                                                NULL);
        } else {
                error = browser_window_create(BW_CREATE_HISTORY,
                                              url,
                                              NULL,
                                              NULL,
                                              NULL);
        }
        nsurl_unref(url);
        if (error != NSERROR_OK) {
                ro_warn_user(messages_get_errorcode(error), 0);
        }
 
 
        /* send DataLoadAck */
        message->action = message_DATA_LOAD_ACK;
        message->your_ref = message->my_ref;
        oserror = xwimp_send_message(wimp_USER_MESSAGE, message,
                        message->sender);
        if (oserror) {
                NSLOG(netsurf, INFO, "xwimp_send_message: 0x%x: %s",
                      oserror->errnum, oserror->errmess);
                ro_warn_user("WimpError", oserror->errmess);
                return;
        }
 
}
 
 
/**
 * Ensure that the filename in a data transfer message is NULL terminated
 * (some applications, especially BASIC programs use CR)
 *
 * \param message message to be corrected
 */
static void ro_msg_terminate_filename(wimp_full_message_data_xfer *message)
{
        const char *ep = (char*)message + message->size;
        char *p = message->file_name;
 
        if ((size_t)message->size >= sizeof(*message))
                ep = (char*)message + sizeof(*message) - 1;
 
        while (p < ep && *p >= ' ') p++;
        *p = '\0';
}
 
 
/**
 * Handle Message_DataSave
 */
static void ro_msg_datasave(wimp_message *message)
{
        wimp_full_message_data_xfer *dataxfer = (wimp_full_message_data_xfer*)message;
 
        /* remove ghost caret if drag-and-drop protocol was used */
//      ro_gui_selection_drag_reset();
 
        ro_msg_terminate_filename(dataxfer);
 
        if (ro_gui_selection_prepare_paste_datasave(dataxfer))
                return;
 
        switch (dataxfer->file_type) {
                case FILETYPE_ACORN_URI:
                case FILETYPE_ANT_URL:
                case FILETYPE_IEURL:
                case FILETYPE_HTML:
                case FILETYPE_JNG:
                case FILETYPE_CSS:
                case FILETYPE_MNG:
                case FILETYPE_GIF:
                case FILETYPE_BMP:
                case FILETYPE_ICO:
                case osfile_TYPE_DRAW:
                case FILETYPE_PNG:
                case FILETYPE_JPEG:
                case osfile_TYPE_SPRITE:
                case osfile_TYPE_TEXT:
                case FILETYPE_ARTWORKS:
                case FILETYPE_SVG:
                case FILETYPE_WEBP: {
                        os_error *error;
 
                        dataxfer->your_ref = dataxfer->my_ref;
                        dataxfer->size = offsetof(wimp_full_message_data_xfer, file_name) + 16;
                        dataxfer->action = message_DATA_SAVE_ACK;
                        dataxfer->est_size = -1;
                        memcpy(dataxfer->file_name, "<Wimp$Scrap>", 13);
 
                        error = xwimp_send_message(wimp_USER_MESSAGE, (wimp_message*)dataxfer, message->sender);
                        if (error) {
                                NSLOG(netsurf, INFO,
                                      "xwimp_send_message: 0x%x: %s",
                                      error->errnum,
                                      error->errmess);
                                ro_warn_user("WimpError", error->errmess);
                        }
                }
                break;
        }
}
 
 
/**
 * Handle Message_DataSaveAck.
 */
static void ro_msg_datasave_ack(wimp_message *message)
{
        ro_msg_terminate_filename((wimp_full_message_data_xfer*)message);
 
        if (ro_print_ack(message))
                return;
 
        switch (gui_current_drag_type) {
                case GUI_DRAG_DOWNLOAD_SAVE:
                        ro_gui_download_datasave_ack(message);
                        break;
 
                case GUI_DRAG_SAVE:
                        ro_gui_save_datasave_ack(message);
                        gui_current_drag_type = GUI_DRAG_NONE;
                        break;
 
                default:
                        break;
        }
 
        gui_current_drag_type = GUI_DRAG_NONE;
}
 
 
/**
 * Handle PreQuit message
 *
 * \param  message  PreQuit message from Wimp
 */
static void ro_msg_prequit(wimp_message *message)
{
        if (!ro_gui_prequit()) {
                os_error *error;
 
                /* we're objecting to the close down */
                message->your_ref = message->my_ref;
                error = xwimp_send_message(wimp_USER_MESSAGE_ACKNOWLEDGE,
                                                message, message->sender);
                if (error) {
                        NSLOG(netsurf, INFO, "xwimp_send_message: 0x%x:%s",
                              error->errnum, error->errmess);
                        ro_warn_user("WimpError", error->errmess);
                }
        }
}
 
 
/**
 * Handle SaveDesktop message.
 *
 * \param message SaveDesktop message from Wimp.
 */
static void ro_msg_save_desktop(wimp_message *message)
{
        os_error *error;
 
        error = xosgbpb_writew(message->data.save_desktopw.file,
                                (const byte*)"Run ", 4, NULL);
        if (!error) {
                error = xosgbpb_writew(message->data.save_desktopw.file,
                                        (const byte*)NETSURF_DIR, strlen(NETSURF_DIR), NULL);
                if (!error)
                        error = xos_bputw('\n', message->data.save_desktopw.file);
        }
 
        if (error) {
                NSLOG(netsurf, INFO, "xosgbpb_writew/xos_bputw: 0x%x:%s",
                      error->errnum, error->errmess);
                ro_warn_user("SaveError", error->errmess);
 
                /* we must cancel the save by acknowledging the message */
                message->your_ref = message->my_ref;
                error = xwimp_send_message(wimp_USER_MESSAGE_ACKNOWLEDGE,
                                                message, message->sender);
                if (error) {
                        NSLOG(netsurf, INFO, "xwimp_send_message: 0x%x:%s",
                              error->errnum, error->errmess);
                        ro_warn_user("WimpError", error->errmess);
                }
        }
}
 
 
/**
 * Handle WindowInfo message (part of the iconising protocol)
 *
 * \param  message  WindowInfo message from the Iconiser
 */
static void ro_msg_window_info(wimp_message *message)
{
        wimp_full_message_window_info *wi;
        struct gui_window *g;
 
        /* allow the user to turn off thumbnail icons */
        if (!nsoption_bool(thumbnail_iconise))
                return;
 
        wi = (wimp_full_message_window_info*)message;
        g = ro_gui_window_lookup(wi->w);
 
        /* ic_<task name> will suffice for our other windows */
        if (g) {
                ro_gui_window_iconise(g, wi);
                ro_gui_dialog_close_persistent(wi->w);
        }
}
 
 
/**
 * Get screen properties following a mode change.
 */
static void ro_gui_get_screen_properties(void)
{
        static const ns_os_vdu_var_list vars = {
                os_MODEVAR_XWIND_LIMIT,
                {
                        os_MODEVAR_YWIND_LIMIT,
                        os_MODEVAR_XEIG_FACTOR,
                        os_MODEVAR_YEIG_FACTOR,
                        os_VDUVAR_END_LIST
                }
        };
        os_error *error;
        int vals[4];
 
        error = xos_read_vdu_variables(PTR_OS_VDU_VAR_LIST(&vars), vals);
        if (error) {
                NSLOG(netsurf, INFO, "xos_read_vdu_variables: 0x%x: %s",
                      error->errnum, error->errmess);
                ro_warn_user("MiscError", error->errmess);
                return;
        }
        screen_info.width  = (vals[0] + 1) << vals[2];
        screen_info.height = (vals[1] + 1) << vals[3];
}
 
 
/**
 * Warn the user if Inet$Resolvers is not set.
 */
static void ro_gui_check_resolvers(void)
{
        char *resolvers;
        resolvers = getenv("Inet$Resolvers");
        if (resolvers && resolvers[0]) {
                NSLOG(netsurf, INFO, "Inet$Resolvers '%s'", resolvers);
        } else {
                NSLOG(netsurf, INFO, "Inet$Resolvers not set or empty");
                ro_warn_user("Resolvers", 0);
        }
}
 
/**
 * Determine whether the OS version supports alpha channels.
 *
 * \return true iff alpha channels are supported, false otherwise.
 */
static bool ro_gui__os_alpha_sprites_supported(void)
{
        os_error *error;
        int var_val;
        bits psr;
 
        psr = 0;
        error = xos_read_mode_variable(alpha_SPRITE_MODE,
                        os_MODEVAR_MODE_FLAGS, &var_val, &psr);
        if (error) {
                NSLOG(netsurf, ERROR, "xos_read_mode_variable: 0x%x: %s",
                                error->errnum, error->errmess);
                return false;
        }
 
        return (var_val == (1 << 15));
}
 
/**
 * Initialise the RISC OS specific GUI.
 *
 * \param argc The number of command line arguments.
 * \param argv The string vector of command line arguments.
 */
static nserror gui_init(int argc, char** argv)
{
        struct {
                void (*sigabrt)(int);
                void (*sigfpe)(int);
                void (*sigill)(int);
                void (*sigint)(int);
                void (*sigsegv)(int);
                void (*sigterm)(int);
                void (*sigoserror)(int);
        } prev_sigs;
        char path[40];
        os_error *error;
        int length;
        char *nsdir_temp;
        byte *base;
        nsurl *url;
        nserror ret;
        bool open_window;
 
        /* re-enable all FPU exceptions/traps except inexact operations,
         * which we're not interested in, and underflow which is incorrectly
         * raised when converting an exact value of 0 from double-precision
         * to single-precision on FPEmulator v4.09-4.11 (MVFD F0,#0:MVFS F0,F0)
         * - UnixLib disables all FP exceptions by default */
 
        _FPU_SETCW(_FPU_IEEE & ~(_FPU_MASK_PM | _FPU_MASK_UM));
 
        xhourglass_start(1);
 
        /* read OS version for code that adapts to conform to the OS
         * (remember that it's preferable to check for specific features
         * being present) */
        xos_byte(osbyte_IN_KEY, 0, 0xff, &os_version, NULL);
 
        os_alpha_sprite_supported = ro_gui__os_alpha_sprites_supported();
        NSLOG(netsurf, INFO, "OS supports alpha sprites: %s",
                        os_alpha_sprite_supported ? "yes" : "no");
 
        /* the first release version of the A9home OS is incapable of
           plotting patterned lines (presumably a fault in the hw acceleration) */
        if (!xosmodule_lookup("VideoHWSMI", NULL, NULL, &base, NULL, NULL)) {
#if 0   // this fault still hasn't been fixed, so disable patterned lines for all versions until it has
                const char *help = (char*)base + ((int*)base)[5];
                while (*help > 9) help++;
                while (*help == 9) help++;
                if (!memcmp(help, "0.55", 4))
#endif
                        ro_plot_patterned_lines = false;
        }
 
        /* Create our choices directories */
        ro_gui_create_dirs();
 
        /* Register exit and signal handlers */
        atexit(ro_gui_cleanup);
        prev_sigs.sigabrt = signal(SIGABRT, ro_gui_signal);
        prev_sigs.sigfpe = signal(SIGFPE, ro_gui_signal);
        prev_sigs.sigill = signal(SIGILL, ro_gui_signal);
        prev_sigs.sigint = signal(SIGINT, ro_gui_signal);
        prev_sigs.sigsegv = signal(SIGSEGV, ro_gui_signal);
        prev_sigs.sigterm = signal(SIGTERM, ro_gui_signal);
        prev_sigs.sigoserror = signal(SIGOSERROR, ro_gui_signal);
 
        if (prev_sigs.sigabrt == SIG_ERR || prev_sigs.sigfpe == SIG_ERR ||
                        prev_sigs.sigill == SIG_ERR ||
                        prev_sigs.sigint == SIG_ERR ||
                        prev_sigs.sigsegv == SIG_ERR ||
                        prev_sigs.sigterm == SIG_ERR ||
                        prev_sigs.sigoserror == SIG_ERR)
                die("Failed registering signal handlers");
 
        /* Load in UI sprites */
        gui_sprites = ro_gui_load_sprite_file("NetSurf:Resources.Sprites");
        if (!gui_sprites)
                die("Unable to load Sprites.");
 
        /* Find NetSurf directory */
        nsdir_temp = getenv("NetSurf$Dir");
        if (!nsdir_temp)
                die("Failed to locate NetSurf directory");
        NETSURF_DIR = strdup(nsdir_temp);
        if (!NETSURF_DIR)
                die("Failed duplicating NetSurf directory string");
 
        /* Initialise filename allocator */
        filename_initialise();
 
        /* Initialise save complete functionality */
        save_complete_init();
 
        /* Load in visited URLs and Cookies */
        urldb_load(nsoption_charp(url_path));
        urldb_load_cookies(nsoption_charp(cookie_file));
 
        /* Initialise with the wimp */
        error = xwimp_initialise(wimp_VERSION_RO38, task_name,
                        PTR_WIMP_MESSAGE_LIST(&task_messages), 0,
                        &task_handle);
        if (error) {
                NSLOG(netsurf, INFO, "xwimp_initialise: 0x%x: %s",
                      error->errnum, error->errmess);
                die(error->errmess);
        }
        /* Register message handlers */
        ro_message_register_route(message_HELP_REQUEST,
                        ro_gui_interactive_help_request);
        ro_message_register_route(message_DATA_OPEN,
                        ro_msg_dataopen);
        ro_message_register_route(message_DATA_SAVE,
                        ro_msg_datasave);
        ro_message_register_route(message_DATA_SAVE_ACK,
                        ro_msg_datasave_ack);
        ro_message_register_route(message_PRE_QUIT,
                        ro_msg_prequit);
        ro_message_register_route(message_SAVE_DESKTOP,
                        ro_msg_save_desktop);
        ro_message_register_route(message_DRAGGING,
                        ro_gui_selection_dragging);
        ro_message_register_route(message_DRAG_CLAIM,
                        ro_gui_selection_drag_claim);
        ro_message_register_route(message_WINDOW_INFO,
                        ro_msg_window_info);
 
        /* Initialise the font subsystem (must be after Wimp_Initialise) */
        nsfont_init();
 
        /* Initialise the hotlist (must be after fonts) */
        hotlist_init(nsoption_charp(hotlist_path),
                        nsoption_bool(external_hotlists) ?
                                        NULL :
                                        nsoption_charp(hotlist_save));
 
        /* Initialise global information */
        ro_gui_get_screen_properties();
        ro_gui_wimp_get_desktop_font();
 
        /* Issue a *Desktop to poke AcornURI into life */
        if (getenv("NetSurf$Start_URI_Handler"))
                xwimp_start_task("Desktop", 0);
 
        /* Open the templates */
        if ((length = snprintf(path, sizeof(path),
                        "NetSurf:Resources.%s.Templates",
                        nsoption_charp(language))) < 0 || length >= (int)sizeof(path))
                die("Failed to locate Templates resource.");
        error = xwimp_open_template(path);
        if (error) {
                NSLOG(netsurf, INFO, "xwimp_open_template failed: 0x%x: %s",
                      error->errnum, error->errmess);
                die(error->errmess);
        }
 
        /* Initialise themes before dialogs */
        ro_gui_theme_initialise();
 
        /* Initialise dialog windows (must be after UI sprites are loaded) */
        ro_gui_dialog_init();
 
        /* Initialise download window */
        ro_gui_download_init();
 
        /* Initialise menus */
        ro_gui_menu_init();
 
        /* Initialise query windows */
        ro_gui_query_init();
 
        /* Initialise toolbars */
        ro_toolbar_init();
 
        /* Initialise url bar module */
        ro_gui_url_bar_init();
 
        /* Initialise browser windows */
        ro_gui_window_initialise();
 
        /* Done with the templates file */
        wimp_close_template();
 
        /* Create Iconbar icon and menus */
        ro_gui_iconbar_initialise();
 
        /* Finally, check Inet$Resolvers for sanity */
        ro_gui_check_resolvers();
 
        open_window = nsoption_bool(open_browser_at_startup);
 
        /* parse command-line arguments */
        if (argc == 2) {
                NSLOG(netsurf, INFO, "parameters: '%s'", argv[1]);
                /* this is needed for launching URI files */
                if (strcasecmp(argv[1], "-nowin") == 0) {
                        return NSERROR_OK;
                }
                ret = nsurl_create(NETSURF_HOMEPAGE, &url);
        }
        else if (argc == 3) {
                NSLOG(netsurf, INFO, "parameters: '%s' '%s'", argv[1],
                      argv[2]);
                open_window = true;
 
                /* HTML files */
                if (strcasecmp(argv[1], "-html") == 0) {
                        ret = netsurf_path_to_nsurl(argv[2], &url);
                }
                /* URL files */
                else if (strcasecmp(argv[1], "-urlf") == 0) {
                        char *urlf = ro_gui_url_file_parse(argv[2]);
                        if (!urlf) {
                                NSLOG(netsurf, INFO, "allocation failed");
                                die("Insufficient memory for URL");
                        }
                        ret = nsurl_create(urlf, &url);
                        free(urlf);
                }
                /* ANT URL Load */
                else if (strcasecmp(argv[1], "-url") == 0) {
                        ret = nsurl_create(argv[2], &url);
                }
                /* Unknown => exit here. */
                else {
                        NSLOG(netsurf, INFO, "Unknown parameters: '%s' '%s'",
                              argv[1], argv[2]);
                        return NSERROR_BAD_PARAMETER;
                }
        }
        /* get user's homepage (if configured) */
        else if (nsoption_charp(homepage_url) &&
                 nsoption_charp(homepage_url)[0]) {
                ret = nsurl_create(nsoption_charp(homepage_url), &url);
        }
        /* default homepage */
        else {
                ret = nsurl_create(NETSURF_HOMEPAGE, &url);
        }
 
        /* check for url creation error */
        if (ret != NSERROR_OK) {
                return ret;
        }
 
        if (open_window) {
                ret = browser_window_create(BW_CREATE_HISTORY,
                                            url,
                                            NULL,
                                            NULL,
                                            NULL);
        }
        nsurl_unref(url);
 
        return ret;
}
 
 
/**
 * Determine the default language to use.
 *
 * RISC OS has no standard way of determining which language the user prefers.
 * We have to guess from the 'Country' setting.
 */
const char *ro_gui_default_language(void)
{
        char path[40];
        const char *lang;
        int country;
        os_error *error;
 
        /* choose a language from the configured country number */
        error = xosbyte_read(osbyte_VAR_COUNTRY_NUMBER, &country);
        if (error) {
                NSLOG(netsurf, INFO, "xosbyte_read failed: 0x%x: %s",
                      error->errnum, error->errmess);
                country = 1;
        }
        switch (country) {
                case 7: /* Germany */
                case 30: /* Austria */
                case 35: /* Switzerland (70% German-speaking) */
                        lang = "de";
                        break;
                case 6: /* France */
                case 18: /* Canada2 (French Canada?) */
                        lang = "fr";
                        break;
                case 34: /* Netherlands */
                        lang = "nl";
                        break;
                default:
                        lang = "en";
                        break;
        }
        sprintf(path, "NetSurf:Resources.%s", lang);
        if (is_dir(path))
                return lang;
        return "en";
}
 
 
/**
 * Create a nsurl from a RISC OS pathname.
 *
 * Perform the necessary operations on a path to generate a nsurl.
 *
 * @param[in] path The RISC OS pathname to convert.
 * @param[out] url_out pointer to recive the nsurl, The returned url must be
 *                 unreferenced by the caller.
 * @return NSERROR_OK and the url is placed in \a url or error code on faliure.
 */
static nserror ro_path_to_nsurl(const char *path, struct nsurl **url_out)
{
        int spare;
        char *canonical_path; /* canonicalised RISC OS path */
        char *unix_path; /* unix path */
        char *escaped_path;
        os_error *error;
        nserror ret;
        int urllen;
        char *url; /* resulting url */
 
        /* calculate the canonical risc os path */
        error = xosfscontrol_canonicalise_path(path, 0, 0, 0, 0, &spare);
        if (error) {
                NSLOG(netsurf, INFO,
                      "xosfscontrol_canonicalise_path failed: 0x%x: %s",
                      error->errnum,
                      error->errmess);
                ro_warn_user("PathToURL", error->errmess);
                return NSERROR_NOT_FOUND;
        }
 
        canonical_path = malloc(1 - spare);
        if (canonical_path == NULL) {
                free(canonical_path);
                return NSERROR_NOMEM;
        }
 
        error = xosfscontrol_canonicalise_path(path, canonical_path, 0, 0, 1 - spare, 0);
        if (error) {
                NSLOG(netsurf, INFO,
                      "xosfscontrol_canonicalise_path failed: 0x%x: %s",
                      error->errnum,
                      error->errmess);
                ro_warn_user("PathToURL", error->errmess);
                free(canonical_path);
                return NSERROR_NOT_FOUND;
        }
 
        /* create a unix path from the cananocal risc os one */
        unix_path = __unixify(canonical_path, __RISCOSIFY_NO_REVERSE_SUFFIX, NULL, 0, 0);
 
        if (unix_path == NULL) {
                NSLOG(netsurf, INFO, "__unixify failed: %s", canonical_path);
                free(canonical_path);
                return NSERROR_BAD_PARAMETER;
        }
        free(canonical_path);
 
        /* url escape the unix path */
        ret = url_escape(unix_path, false, "/", &escaped_path);
        if (ret != NSERROR_OK) {
                free(unix_path);
                return ret;
        }
        free(unix_path);
 
        /* convert the escaped unix path into a url */
        urllen = strlen(escaped_path) + FILE_SCHEME_PREFIX_LEN + 1;
        url = malloc(urllen);
        if (url == NULL) {
                NSLOG(netsurf, INFO, "Unable to allocate url");
                free(escaped_path);
                return NSERROR_NOMEM;
        }
 
        if (*escaped_path == '/') {
                snprintf(url, urllen, "%s%s",
                                FILE_SCHEME_PREFIX, escaped_path + 1);
        } else {
                snprintf(url, urllen, "%s%s",
                                FILE_SCHEME_PREFIX, escaped_path);
        }
        free(escaped_path);
 
        ret = nsurl_create(url, url_out);
        free(url);
 
        return ret;
}
 
 
/**
 * Create a path from a nsurl using posix file handling.
 *
 * @param[in] url The url to encode.
 * @param[out] path_out A string containing the result path which should
 *                      be freed by the caller.
 * @return NSERROR_OK and the path is written to \a path or error code
 *         on faliure.
 */
static nserror ro_nsurl_to_path(struct nsurl *url, char **path_out)
{
        lwc_string *urlpath;
        size_t unpath_len;
        char *unpath;
        char *path;
        bool match;
        lwc_string *scheme;
        nserror res;
        char *r;
 
        if ((url == NULL) || (path_out == NULL)) {
                return NSERROR_BAD_PARAMETER;
        }
 
        scheme = nsurl_get_component(url, NSURL_SCHEME);
 
        if (lwc_string_caseless_isequal(scheme, corestring_lwc_file,
                                        &match) != lwc_error_ok)
        {
                return NSERROR_BAD_PARAMETER;
        }
        lwc_string_unref(scheme);
        if (match == false) {
                return NSERROR_BAD_PARAMETER;
        }
 
        urlpath = nsurl_get_component(url, NSURL_PATH);
        if (urlpath == NULL) {
                return NSERROR_BAD_PARAMETER;
        }
 
        res = url_unescape(lwc_string_data(urlpath),
                           lwc_string_length(urlpath),
                           &unpath_len,
                           &unpath);
        lwc_string_unref(urlpath);
        if (res != NSERROR_OK) {
                return res;
        }
 
        /* RISC OS path should not be more than 100 characters longer */
        path = malloc(unpath_len + 100);
        if (path == NULL) {
                free(unpath);
                return NSERROR_NOMEM;
        }
 
        r = __riscosify(unpath, 0, __RISCOSIFY_NO_SUFFIX,
                        path, unpath_len + 100, 0);
        free(unpath);
        if (r == NULL) {
                free(path);
                return NSERROR_NOMEM;
        }
 
        *path_out = path;
 
        return NSERROR_OK;
}
 
 
/**
 * Ensures output logging stream is correctly configured.
 */
static bool nslog_stream_configure(FILE *fptr)
{
        /* set log stream to be non-buffering */
        setbuf(fptr, NULL);
 
        return true;
}
 
 
/**
 * Close down the gui (RISC OS).
 */
static void gui_quit(void)
{
        urldb_save_cookies(nsoption_charp(cookie_jar));
        urldb_save(nsoption_charp(url_save));
        ro_gui_window_quit();
        ro_gui_local_history_finalise();
        ro_gui_global_history_finalise();
        ro_gui_pageinfo_finalise();
        ro_gui_hotlist_finalise();
        ro_gui_cookies_finalise();
        ro_gui_saveas_quit();
        ro_gui_url_bar_fini();
        rufl_quit();
        free(gui_sprites);
        xwimp_close_down(task_handle);
        xhourglass_off();
}
 
 
/**
 * Handle Close_Window_Request events.
 */
static void ro_gui_close_window_request(wimp_close *close)
{
        if (ro_gui_alt_pressed())
                ro_gui_window_close_all();
        else {
                if (ro_gui_wimp_event_close_window(close->w))
                        return;
                ro_gui_dialog_close(close->w);
        }
}
 
 
/**
 * Handle key press paste callback.
 */
static void ro_gui_keypress_cb(void *pw)
{
        wimp_key *key = (wimp_key *) pw;
 
        if (ro_gui_wimp_event_keypress(key) == false) {
                os_error *error = xwimp_process_key(key->c);
                if (error) {
                        NSLOG(netsurf, INFO, "xwimp_process_key: 0x%x: %s",
                              error->errnum, error->errmess);
                        ro_warn_user("WimpError", error->errmess);
                }
        }
 
        free(key);
}
 
 
/**
 * Handle gui keypress.
 */
static void ro_gui_keypress(wimp_key *key)
{
        if (key->c == wimp_KEY_ESCAPE &&
                (gui_current_drag_type == GUI_DRAG_SAVE ||
                 gui_current_drag_type == GUI_DRAG_DOWNLOAD_SAVE)) {
 
                /* Allow Escape key to be used for cancelling a drag
                 * save (easier than finding somewhere safe to abort
                 * the drag)
                 */
                ro_gui_drag_box_cancel();
                gui_current_drag_type = GUI_DRAG_NONE;
        } else if (key->c == 22 /* Ctrl-V */) {
                wimp_key *copy;
 
                /* Must copy the keypress as it's on the stack */
                copy = malloc(sizeof(wimp_key));
                if (copy == NULL)
                        return;
                memcpy(copy, key, sizeof(wimp_key));
 
                ro_gui_selection_prepare_paste(key->w, ro_gui_keypress_cb, copy);
        } else if (ro_gui_wimp_event_keypress(key) == false) {
                os_error *error = xwimp_process_key(key->c);
                if (error) {
                        NSLOG(netsurf, INFO, "xwimp_process_key: 0x%x: %s",
                              error->errnum, error->errmess);
                        ro_warn_user("WimpError", error->errmess);
                }
        }
}
 
 
/**
 * Handle the three User_Message events.
 */
static void ro_gui_user_message(wimp_event_no event, wimp_message *message)
{
        /* attempt automatic routing */
        if (ro_message_handle_message(event, message))
                return;
 
        switch (message->action) {
                case message_DATA_LOAD:
                        ro_msg_terminate_filename((wimp_full_message_data_xfer*)message);
 
                        if (event == wimp_USER_MESSAGE_ACKNOWLEDGE) {
                                if (ro_print_current_window)
                                        ro_print_dataload_bounce(message);
                        } else if (ro_gui_selection_prepare_paste_dataload(
                                        (wimp_full_message_data_xfer *) message) == false) {
                                ro_msg_dataload(message);
                        }
                        break;
 
                case message_DATA_LOAD_ACK:
                        if (ro_print_current_window)
                                ro_print_cleanup();
                        break;
 
                case message_MENU_WARNING:
                        ro_gui_menu_warning((wimp_message_menu_warning *)
                                        &message->data);
                        break;
 
                case message_MENUS_DELETED:
                        ro_gui_menu_message_deleted((wimp_message_menus_deleted *)
                                        &message->data);
                        break;
 
                case message_CLAIM_ENTITY:
                        ro_gui_selection_claim_entity((wimp_full_message_claim_entity*)message);
                        break;
 
                case message_DATA_REQUEST:
                        ro_gui_selection_data_request((wimp_full_message_data_request*)message);
                        break;
 
                case message_MODE_CHANGE:
                        ro_gui_get_screen_properties();
                        rufl_invalidate_cache();
                        break;
 
                case message_PALETTE_CHANGE:
                        break;
 
                case message_FONT_CHANGED:
                        ro_gui_wimp_get_desktop_font();
                        break;
 
                case message_URI_PROCESS:
                        if (event != wimp_USER_MESSAGE_ACKNOWLEDGE)
                                ro_uri_message_received(message);
                        break;
                case message_URI_RETURN_RESULT:
                        ro_uri_bounce(message);
                        break;
                case message_INET_SUITE_OPEN_URL:
                        if (event == wimp_USER_MESSAGE_ACKNOWLEDGE) {
                                ro_url_bounce(message);
                        }
                        else {
                                ro_url_message_received(message);
                        }
                        break;
                case message_PRINT_SAVE:
                        if (event == wimp_USER_MESSAGE_ACKNOWLEDGE)
                                ro_print_save_bounce(message);
                        break;
                case message_PRINT_ERROR:
                        ro_print_error(message);
                        break;
                case message_PRINT_TYPE_ODD:
                        ro_print_type_odd(message);
                        break;
                case message_HOTLIST_CHANGED:
                        ro_gui_hotlist_add_cleanup();
                        break;
                case message_QUIT:
                        riscos_done = true;
                        break;
        }
}
 
 
/**
 * Process a Wimp_Poll event.
 *
 * \param event wimp event number
 * \param block parameter block
 */
static void ro_gui_handle_event(wimp_event_no event, wimp_block *block)
{
        switch (event) {
                case wimp_NULL_REASON_CODE:
                        ro_gui_throb();
                        ro_mouse_poll();
                        break;
 
                case wimp_REDRAW_WINDOW_REQUEST:
                        ro_gui_wimp_event_redraw_window(&block->redraw);
                        break;
 
                case wimp_OPEN_WINDOW_REQUEST:
                        ro_gui_open_window_request(&block->open);
                        break;
 
                case wimp_CLOSE_WINDOW_REQUEST:
                        ro_gui_close_window_request(&block->close);
                        break;
 
                case wimp_POINTER_LEAVING_WINDOW:
                        ro_mouse_pointer_leaving_window(&block->leaving);
                        break;
 
                case wimp_POINTER_ENTERING_WINDOW:
                        ro_gui_wimp_event_pointer_entering_window(&block->entering);
                        break;
 
                case wimp_MOUSE_CLICK:
                        ro_gui_wimp_event_mouse_click(&block->pointer);
                        break;
 
                case wimp_USER_DRAG_BOX:
                        ro_mouse_drag_end(&block->dragged);
                        break;
 
                case wimp_KEY_PRESSED:
                        ro_gui_keypress(&(block->key));
                        break;
 
                case wimp_MENU_SELECTION:
                        ro_gui_menu_selection(&(block->selection));
                        break;
 
                /* Scroll requests fall back to a generic handler because we
                 * might get these events for any window from a scroll-wheel.
                 */
 
                case wimp_SCROLL_REQUEST:
                        if (!ro_gui_wimp_event_scroll_window(&(block->scroll)))
                                ro_gui_scroll(&(block->scroll));
                        break;
 
                case wimp_USER_MESSAGE:
                case wimp_USER_MESSAGE_RECORDED:
                case wimp_USER_MESSAGE_ACKNOWLEDGE:
                        ro_gui_user_message(event, &(block->message));
                        break;
        }
}
 
 
/**
 * Poll the RISC OS wimp for events.
 */
static void riscos_poll(void)
{
        wimp_event_no event;
        wimp_block block;
        const wimp_poll_flags mask = wimp_MASK_LOSE | wimp_MASK_GAIN | wimp_SAVE_FP;
        os_t track_poll_offset;
 
        /* Poll wimp. */
        xhourglass_off();
        track_poll_offset = ro_mouse_poll_interval();
        if (sched_active || (track_poll_offset > 0)) {
                os_t t = os_read_monotonic_time();
 
                if (track_poll_offset > 0) {
                        t += track_poll_offset;
                } else {
                        t += 10;
                }
 
                if (sched_active && (sched_time - t) < 0) {
                        t = sched_time;
                }
 
                event = wimp_poll_idle(mask, &block, t, 0);
        } else {
                event = wimp_poll(wimp_MASK_NULL | mask, &block, 0);
        }
 
        xhourglass_on();
        gui_last_poll = clock();
        ro_gui_handle_event(event, &block);
 
        /* Only run scheduled callbacks on a null poll
         * We cannot do this in the null event handler, as that may be called
         * from gui_multitask(). Scheduled callbacks must only be run from the
         * top-level.
         */
        if (event == wimp_NULL_REASON_CODE) {
                schedule_run();
        }
 
        ro_gui_window_update_boxes();
}
 
 
/**
 * Handle Open_Window_Request events.
 */
void ro_gui_open_window_request(wimp_open *open)
{
        os_error *error;
 
        if (ro_gui_wimp_event_open_window(open))
                return;
 
        error = xwimp_open_window(open);
        if (error) {
                NSLOG(netsurf, INFO, "xwimp_open_window: 0x%x: %s",
                      error->errnum, error->errmess);
                ro_warn_user("WimpError", error->errmess);
                return;
        }
}
 
 
/**
 * source bounce callback.
 */
static void ro_gui_view_source_bounce(wimp_message *message)
{
        char *filename;
        os_error *error;
        char command[256];
 
        /* run the file as text */
        filename = ((wimp_full_message_data_xfer *)message)->file_name;
        sprintf(command, "@RunType_FFF %s", filename);
        error = xwimp_start_task(command, 0);
        if (error) {
                NSLOG(netsurf, INFO, "xwimp_start_task failed: 0x%x: %s",
                      error->errnum, error->errmess);
                ro_warn_user("WimpError", error->errmess);
        }
}
 
 
/**
 * Send the source of a content to a text editor.
 */
void ro_gui_view_source(struct hlcache_handle *c)
{
        os_error *error;
        char *temp_name;
        wimp_full_message_data_xfer message;
        int objtype;
        bool done = false;
 
        const uint8_t *source_data;
        size_t source_size;
 
        if (!c) {
                ro_warn_user("MiscError", "No document source");
                return;
        }
 
        source_data = content_get_source_data(c, &source_size);
 
        if (!source_data) {
                ro_warn_user("MiscError", "No document source");
                return;
        }
 
        /* try to load local files directly. */
        if (netsurf_nsurl_to_path(hlcache_handle_get_url(c), &temp_name) == NSERROR_OK) {
                error = xosfile_read_no_path(temp_name, &objtype, 0, 0, 0, 0);
                if ((!error) && (objtype == osfile_IS_FILE)) {
                        snprintf(message.file_name, 212, "%s", temp_name);
                        message.file_name[211] = '\0';
                        done = true;
                }
                free(temp_name);
        }
        if (!done) {
                /* We cannot release the requested filename until after it
                 * has finished being used. As we can't easily find out when
                 * this is, we simply don't bother releasing it and simply
                 * allow it to be re-used next time NetSurf is started. The
                 * memory overhead from doing this is under 1 byte per
                 * filename. */
                char *r;
                char full_name[256];
                const char *filename = filename_request();
                if (!filename) {
                        ro_warn_user("NoMemory", 0);
                        return;
                }
 
                snprintf(full_name, 256, "%s/%s", TEMP_FILENAME_PREFIX,
                                filename);
                full_name[255] = '\0';
                r = __riscosify(full_name, 0, __RISCOSIFY_NO_SUFFIX,
                                message.file_name, 212, 0);
                if (r == 0) {
                        NSLOG(netsurf, INFO, "__riscosify failed");
                        return;
                }
                message.file_name[211] = '\0';
 
                error = xosfile_save_stamped(message.file_name,
                                ro_content_filetype(c),
                                (byte *) source_data,
                                (byte *) source_data + source_size);
                if (error) {
                        NSLOG(netsurf, INFO,
                              "xosfile_save_stamped failed: 0x%x: %s",
                              error->errnum,
                              error->errmess);
                        ro_warn_user("MiscError", error->errmess);
                        return;
                }
        }
 
        /* begin the DataOpen protocol */
        message.your_ref = 0;
        message.size = 44 + ((strlen(message.file_name) + 4) & (~3u));
        message.action = message_DATA_OPEN;
        message.w = 0;
        message.i = 0;
        message.pos.x = 0;
        message.pos.y = 0;
        message.est_size = 0;
        message.file_type = 0xfff;
        ro_message_send_message(wimp_USER_MESSAGE_RECORDED,
                        (wimp_message*)&message, 0,
                        ro_gui_view_source_bounce);
}
 
 
/**
 * Broadcast an URL that we can't handle.
 */
static nserror gui_launch_url(struct nsurl *url)
{
        /* Try ant broadcast */
        ro_url_broadcast(nsurl_access(url));
        return NSERROR_OK;
}
 
 
/**
 * Choose the language to use.
 */
static void ro_gui_choose_language(void)
{
        /* if option_language exists and is valid, use that */
        if (nsoption_charp(language)) {
                char path[40];
                if (2 < strlen(nsoption_charp(language)))
                        nsoption_charp(language)[2] = 0;
                sprintf(path, "NetSurf:Resources.%s", nsoption_charp(language));
 
                if (is_dir(path)) {
                        nsoption_setnull_charp(accept_language,
                                        strdup(nsoption_charp(language)));
                        return;
                }
                nsoption_set_charp(language, NULL);
        }
 
        nsoption_set_charp(language, strdup(ro_gui_default_language()));
        if (nsoption_charp(language) == NULL)
                die("Out of memory");
        nsoption_set_charp(accept_language, strdup(nsoption_charp(language)));
        if (nsoption_charp(accept_language) == NULL)
                die("Out of memory");
}
 
 
/**
 * Display a warning for a serious problem (eg memory exhaustion).
 *
 * \param  warning  message key for warning message
 * \param  detail   additional message, or 0
 */
nserror ro_warn_user(const char *warning, const char *detail)
{
        NSLOG(netsurf, INFO, "%s %s", warning, detail);
 
        if (dialog_warning) {
                char warn_buffer[300];
                snprintf(warn_buffer, sizeof warn_buffer, "%s %s",
                                messages_get(warning),
                                detail ? detail : "");
                warn_buffer[sizeof warn_buffer - 1] = 0;
                ro_gui_set_icon_string(dialog_warning, ICON_WARNING_MESSAGE,
                                warn_buffer, true);
                xwimp_set_icon_state(dialog_warning, ICON_WARNING_HELP,
                                wimp_ICON_DELETED, wimp_ICON_DELETED);
                ro_gui_dialog_open(dialog_warning);
                xos_bell();
        } else {
                /* probably haven't initialised (properly), use a
                   non-multitasking error box */
                os_error error;
                snprintf(error.errmess, sizeof error.errmess, "%s %s",
                                messages_get(warning),
                                detail ? detail : "");
                error.errmess[sizeof error.errmess - 1] = 0;
                xwimp_report_error_by_category(&error,
                                wimp_ERROR_BOX_OK_ICON |
                                wimp_ERROR_BOX_GIVEN_CATEGORY |
                                wimp_ERROR_BOX_CATEGORY_ERROR <<
                                        wimp_ERROR_BOX_CATEGORY_SHIFT,
                                "NetSurf", "!netsurf",
                                (osspriteop_area *) 1, 0, 0);
        }
        
        return NSERROR_OK;
}
 
 
/**
 * Display an error and exit.
 *
 * Should only be used during initialisation.
 */
void die(const char * const error)
{
        os_error warn_error;
 
        NSLOG(netsurf, INFO, "%s", error);
 
        warn_error.errnum = 1; /* \todo: reasonable ? */
        strncpy(warn_error.errmess, messages_get(error),
                        sizeof(warn_error.errmess)-1);
        warn_error.errmess[sizeof(warn_error.errmess)-1] = '\0';
        xwimp_report_error_by_category(&warn_error,
                        wimp_ERROR_BOX_OK_ICON |
                        wimp_ERROR_BOX_GIVEN_CATEGORY |
                        wimp_ERROR_BOX_CATEGORY_ERROR <<
                                wimp_ERROR_BOX_CATEGORY_SHIFT,
                        "NetSurf", "!netsurf",
                        (osspriteop_area *) 1, 0, 0);
        exit(EXIT_FAILURE);
}
 
 
/**
 * Test whether it's okay to shutdown, prompting the user if not.
 *
 * \return true iff it's okay to shutdown immediately
 */
bool ro_gui_prequit(void)
{
        return ro_gui_download_prequit();
}
 
 
/**
 * Generate a riscos path from one or more component elemnts.
 *
 * Constructs a complete path element from passed components. The
 * second (and subsequent) components have a slash substituted for all
 * riscos directory separators.
 *
 * If a string is allocated it must be freed by the caller.
 *
 * @param[in,out] str pointer to string pointer if this is NULL enough
 *                    storage will be allocated for the complete path.
 * @param[in,out] size The size of the space available if \a str not
 *                     NULL on input and if not NULL set to the total
 *                     output length on output.
 * @param[in] nelm The number of elements.
 * @param[in] ap The elements of the path as string pointers.
 * @return NSERROR_OK and the complete path is written to str
 *         or error code on faliure.
 */
static nserror riscos_mkpath(char **str, size_t *size, size_t nelm, va_list ap)
{
        const char *elm[16];
        size_t elm_len[16];
        size_t elm_idx;
        char *fname;
        size_t fname_len = 0;
        char *curp;
        size_t idx;
 
        /* check the parameters are all sensible */
        if ((nelm == 0) || (nelm > 16)) {
                return NSERROR_BAD_PARAMETER;
        }
        if ((*str != NULL) && (size == NULL)) {
                /* if the caller is providing the buffer they must say
                 * how much space is available.
                 */
                return NSERROR_BAD_PARAMETER;
        }
 
        /* calculate how much storage we need for the complete path
         * with all the elements.
         */
        for (elm_idx = 0; elm_idx < nelm; elm_idx++) {
                elm[elm_idx] = va_arg(ap, const char *);
                /* check the argument is not NULL */
                if (elm[elm_idx] == NULL) {
                        return NSERROR_BAD_PARAMETER;
                }
                elm_len[elm_idx] = strlen(elm[elm_idx]);
                fname_len += elm_len[elm_idx];
        }
        fname_len += nelm; /* allow for separators and terminator */
 
        /* ensure there is enough space */
        fname = *str;
        if (fname != NULL) {
                if (fname_len > *size) {
                        return NSERROR_NOSPACE;
                }
        } else {
                fname = malloc(fname_len);
                if (fname == NULL) {
                        return NSERROR_NOMEM;
                }
        }
 
        /* copy the elements in with directory separator */
        curp = fname;
 
        /* first element is not altered */
        memmove(curp, elm[0], elm_len[0]);
        curp += elm_len[0];
        /* ensure there is a delimiter */
        if (curp[-1] != DIR_SEP) {
                *curp = DIR_SEP;
                curp++;
        }
 
        /* subsequent elemnts have slashes substituted with directory
         * separators.
         */
        for (elm_idx = 1; elm_idx < nelm; elm_idx++) {
                for (idx = 0; idx < elm_len[elm_idx]; idx++) {
                        if (elm[elm_idx][idx] == DIR_SEP) {
                                *curp = '/';
                        } else {
                                *curp = elm[elm_idx][idx];
                        }
                        curp++;
                }
                *curp = DIR_SEP;
                curp++;
        }
        curp[-1] = 0; /* NULL terminate */
 
        assert((curp - fname) <= (int)fname_len);
 
        *str = fname;
        if (size != NULL) {
                *size = fname_len;
        }
 
        return NSERROR_OK;
 
}
 
 
/**
 * Get the basename of a file using posix path handling.
 *
 * This gets the last element of a path and returns it. The returned
 * element has all forward slashes translated into riscos directory
 * separators.
 *
 * @param[in] path The path to extract the name from.
 * @param[in,out] str Pointer to string pointer if this is NULL enough
 *                    storage will be allocated for the path element.
 * @param[in,out] size The size of the space available if \a
 *                     str not NULL on input and set to the total
 *                     output length on output.
 * @return NSERROR_OK and the complete path is written to str
 *         or error code on faliure.
 */
static nserror riscos_basename(const char *path, char **str, size_t *size)
{
        const char *leafname;
        char *fname;
        char *temp;
 
        if (path == NULL) {
                return NSERROR_BAD_PARAMETER;
        }
 
        leafname = strrchr(path, DIR_SEP);
        if (!leafname) {
                leafname = path;
        } else {
                leafname += 1;
        }
 
        fname = strdup(leafname);
        if (fname == NULL) {
                return NSERROR_NOMEM;
        }
 
        /** @todo check this leafname translation is actually required */
        /* and s/\//\./g */
        for (temp = fname; *temp != 0; temp++) {
                if (*temp == '/') {
                        *temp = DIR_SEP;
                }
        }
 
        *str = fname;
        if (size != NULL) {
                *size = strlen(fname);
        }
        return NSERROR_OK;
}
 
 
/**
 * Ensure that all directory elements needed to store a filename exist.
 *
 * Given a path of x.y.z directories x and x.y will be created.
 *
 * @param fname The filename to ensure the path to exists.
 * @return NSERROR_OK on success or error code on failure.
 */
static nserror riscos_mkdir_all(const char *fname)
{
        char *dname;
        char *cur;
 
        dname = strdup(fname);
 
        cur = dname;
        while ((cur = strchr(cur, '.'))) {
                *cur = '\0';
                xosfile_create_dir(dname, 0);
                *cur++ = '.';
        }
 
        free(dname);
 
        return NSERROR_OK;
}
 
/**
 * Find screen size in OS units.
 */
void ro_gui_screen_size(int *width, int *height)
{
        *width = screen_info.width;
        *height = screen_info.height;
}
 
 
/**
 * Send the debug dump of a content to a text editor.
 */
void ro_gui_dump_browser_window(struct browser_window *bw)
{
        os_error *error;
 
        /* open file for dump */
        FILE *stream = fopen("<Wimp$ScrapDir>.WWW.NetSurf.dump", "w");
        if (!stream) {
                NSLOG(netsurf, INFO, "fopen: errno %i", errno);
                ro_warn_user("SaveError", strerror(errno));
                return;
        }
 
        browser_window_debug_dump(bw, stream, CONTENT_DEBUG_RENDER);
 
        fclose(stream);
 
        /* launch file in editor */
        error = xwimp_start_task("Filer_Run <Wimp$ScrapDir>.WWW.NetSurf.dump",
                        0);
        if (error) {
                NSLOG(netsurf, INFO, "xwimp_start_task failed: 0x%x: %s",
                      error->errnum, error->errmess);
                ro_warn_user("WimpError", error->errmess);
        }
}
 
 
static struct gui_file_table riscos_file_table = {
        .mkpath = riscos_mkpath,
        .basename = riscos_basename,
        .nsurl_to_path = ro_nsurl_to_path,
        .path_to_nsurl = ro_path_to_nsurl,
        .mkdir_all = riscos_mkdir_all,
};
 
static struct gui_fetch_table riscos_fetch_table = {
        .filetype = fetch_filetype,
 
        .get_resource_url = gui_get_resource_url,
        .mimetype = fetch_mimetype,
};
 
static struct gui_misc_table riscos_misc_table = {
        .schedule = riscos_schedule,
 
        .quit = gui_quit,
        .launch_url = gui_launch_url,
        .present_cookies = ro_gui_cookies_present,
};
 
 
static char *get_cachepath(void)
{
        char *cachedir;
        char *cachepath = NULL;
        nserror ret;
 
        cachedir = getenv("Cache$Dir");
        if ((cachedir == NULL) || (cachedir[0] == 0)) {
                NSLOG(netsurf, INFO, "cachedir was null");
                return NULL;
        }
        ret = netsurf_mkpath(&cachepath, NULL, 2, cachedir, "NetSurf");
        if (ret != NSERROR_OK) {
                return NULL;
        }
        return cachepath;
}
 
/**
 * Normal entry point from RISC OS.
 */
int main(int argc, char** argv)
{
        char *cachepath;
        char path[40];
        int length;
        os_var_type type;
        int used = -1;  /* slightly better with older OSLib versions */
        os_error *error;
        nserror ret;
        struct netsurf_table riscos_table = {
                .misc = &riscos_misc_table,
                .window = riscos_window_table,
                .clipboard = riscos_clipboard_table,
                .download = riscos_download_table,
                .fetch = &riscos_fetch_table,
                .file = &riscos_file_table,
                .utf8 = riscos_utf8_table,
                .search = riscos_search_table,
                .llcache = filesystem_llcache_table,
                .bitmap = riscos_bitmap_table,
                .layout = riscos_layout_table,
        };
 
        ret = netsurf_register(&riscos_table);
        if (ret != NSERROR_OK) {
                die("NetSurf operation table failed registration");
        }
 
        /* Consult NetSurf$Logging environment variable to decide if logging
         * is required. */
        error = xos_read_var_val_size("NetSurf$Logging", 0, os_VARTYPE_STRING,
                        &used, NULL, &type);
        if (error != NULL || type != os_VARTYPE_STRING || used != -2) {
                verbose_log = true;
        } else {
                char logging_env[2];
                error = xos_read_var_val("NetSurf$Logging", logging_env,
                                sizeof(logging_env), 0, os_VARTYPE_STRING,
                                &used, NULL, &type);
                if (error != NULL || logging_env[0] != '0') {
                        verbose_log = true;
                } else {
                        verbose_log = false;
                }
        }
 
        /* initialise logging. Not fatal if it fails but not much we
         * can do about it either.
         */
        nslog_init(nslog_stream_configure, &argc, argv);
 
        /* user options setup */
        ret = nsoption_init(set_defaults, &nsoptions, &nsoptions_default);
        if (ret != NSERROR_OK) {
                die("Options failed to initialise");
        }
        nsoption_read("NetSurf:Choices", NULL);
        nsoption_commandline(&argc, argv, NULL);
 
        /* Choose the interface language to use */
        ro_gui_choose_language();
 
        /* select language-specific Messages */
        if (((length = snprintf(path,
                                sizeof(path),
                               "NetSurf:Resources.%s.Messages",
                                nsoption_charp(language))) < 0) ||
            (length >= (int)sizeof(path))) {
                die("Failed to locate Messages resource.");
        }
 
        /* initialise messages */
        messages_add_from_file(path);
 
        /* obtain cache path */
        cachepath = get_cachepath();
 
        /* common initialisation */
        ret = netsurf_init(cachepath);
        free(cachepath);
        if (ret != NSERROR_OK) {
                die("NetSurf failed to initialise core");
        }
 
        artworks_init();
        draw_init();
        sprite_init();
 
        /* Load some extra RISC OS specific Messages */
        messages_add_from_file("NetSurf:Resources.LangNames");
 
        ret = gui_init(argc, argv);
        if (ret != NSERROR_OK) {
                ro_warn_user(messages_get_errorcode(ret), 0);
        }
 
        while (!riscos_done) {
                riscos_poll();
        }
 
        netsurf_exit();
        nsoption_finalise(nsoptions, nsoptions_default);
 
        /* finalise logging */
        nslog_finalise();
 
        return 0;
}