/* Copyright (C) 2000-2012 by George Williams */
/*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.

 * The name of the author may not be used to endorse or promote products
 * derived from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <fontforge-config.h>

#include "fontforgeui.h"
#include "gfile.h"
#include "gkeysym.h"
#include "gresource.h"
#include "ustring.h"
#include "utype.h"

#include <stdarg.h>
#include <sys/time.h>
#include <unistd.h>

#ifdef _WIN32
#include <windows.h>
#endif

extern GBox _ggadget_Default_Box;
#define ACTIVE_BORDER   (_ggadget_Default_Box.active_border)
#define MAIN_FOREGROUND (_ggadget_Default_Box.main_foreground)

#if __CygWin
extern void cygwin_conv_to_full_posix_path(const char *win,char *unx);
extern void cygwin_conv_to_full_win32_path(const char *unx,char *win);
#endif

static char browser[1025];

static void findbrowser(void) {
/* Find a browser to use so that help messages can be displayed */

/* Both xdg-open and htmlview are not browsers per se, but browser dispatchers*/
/*  which try to figure out what browser the user intents. It seems no one */
/*  uses (understands?) environment variables any more, so BROWSER is a bit */
/*  old-fashioned */
    static char *stdbrowsers[] = { "xdg-open", "x-www-browser", "htmlview",
#if __Mac
	"safari",
#endif
	"firefox", "mozilla", "seamonkey", "iceweasel", "opera", "konqueror", "google-chrome",
	"galeon", "kfmclient", "netscape", "mosaic", /*"grail",*/ "lynx",
	NULL };
    int i;
    char *path;

    if ( getenv("BROWSER")!=NULL ) {
	strncpy(browser,getenv("BROWSER"),sizeof(browser));
    browser[sizeof(browser)-1] = '\0';
	if ( strcmp(browser,"kde")==0 || strcmp(browser,"kfm")==0 ||
		strcmp(browser,"konqueror")==0 || strcmp(browser,"kfmclient")==0 )
	    strcpy(browser,"kfmclient openURL");
return;
    }
    for ( i=0; stdbrowsers[i]!=NULL; ++i ) {
	if ( (path=_GFile_find_program_dir(stdbrowsers[i]))!=NULL ) {
	    if ( strcmp(stdbrowsers[i],"kfmclient")==0 )
		strcpy(browser,"kfmclient openURL");
	    else
		strcpy(browser,stdbrowsers[i]);
	    free(path);
return;
	}
    }
#if __Mac
    strcpy(browser,"open");	/* thanks to riggle */
#endif
}

static int SupportedLocale(char *fullspec,char *locale) {
/* If there's additional help files written for other languages, then check */
/* to see if this local matches the additional help message language. If so */
/* then report back that there's another language available to use for help */
/* NOTE: If Docs are not maintained very well, maybe comment-out lang here. */
    int i;
    /* list languages in specific to generic order, ie: en_CA, en_GB, en... */
    static char *supported[] = { "de","ja", NULL }; /* other html lang list */

    for ( i=0; supported[i]!=NULL; ++i ) {
	if ( strcmp(locale,supported[i])==0 ) {
	    strcat(fullspec,supported[i]);
	    strcat(fullspec,"/");
	    return( true );
	}
    }
    return( false );
}

static void AppendSupportedLocale(char *fullspec) {
/* Add Browser HELP for this local if there's more html docs for this local */

    /* KANOU has provided a japanese translation of the docs */
    /* Edward Lee is working on traditional chinese docs */
    const char *loc = getenv("LC_ALL");
    char buffer[40], *pt;

    if ( loc==NULL ) loc = getenv("LC_CTYPE");
    if ( loc==NULL ) loc = getenv("LANG");
    if ( loc==NULL ) loc = getenv("LC_MESSAGES");
    if ( loc==NULL )
	return;

    /* first, try checking entire string */
    strncpy(buffer,loc,sizeof(buffer));
    buffer[sizeof(buffer)-1] = '\0';
    if ( SupportedLocale(fullspec,buffer) )
	return;

    /* parse possible suffixes, such as .UTF-8, then try again */
    if ( (pt=strchr(buffer,'.'))!=NULL ) {
	*pt = '\0';
	if ( SupportedLocale(fullspec,buffer) )
	    return;
    }

    /* parse possible suffixes such as _CA, _GB, and try again */
    if ( (pt=strchr(buffer,'_'))!=NULL ) {
	*pt = '\0';
	if ( SupportedLocale(fullspec,buffer) )
	    return;
    }
}

#ifdef _WIN32
void help(char *file) {
    if(file){
	int   len     = strlen(file);
	char* p_file  = (char*) malloc(len+1);
	char* p_uri   = (char*) malloc(len+1024);
	char* p_param = NULL;

	strcpy(p_file,  file);

	{
	    char* delim = strrchr(p_file, '#');
	    if(delim){
		p_param = (char*) malloc(len+1);
		strcpy(p_param, delim);
		*delim = '\0';
	    }
	}

	strcpy(p_uri, p_file);

	if(! GFileIsAbsolute(p_uri)){
	    char* p_helpdir = getHelpDir();

	    /* /usr/share/fontforge/doc/ja/file */
	    strcpy(p_uri, p_helpdir);
	    AppendSupportedLocale(p_uri);
	    strcat(p_uri, p_file);

	    if(!GFileReadable(p_uri)){
		strcpy(p_uri, p_helpdir);
		strcat(p_uri, p_file);

		if(!GFileReadable(p_uri)){
		    strcpy(p_uri, "http://fontforge.org/");
		    /* AppendSupportedLocale(p_uri); */
		    strcat(p_uri, p_file);
		}
	    }
	}

	#if __CygWin
	if( strncmp(p_uri, "http:", 5) != 0 ){
	    char*  temp = (char*) malloc(1024);
	    cygwin_conv_to_full_win32_path(p_uri, temp);
	    free(p_uri);
	    p_uri = temp;
	}
	#endif

	if(p_param){
	    strcat(p_uri, p_param);
	    free(p_param);
	}

	/* using default browser */
	ShellExecute(NULL, "open", p_uri, NULL, NULL, SW_SHOWDEFAULT);

	free(p_uri);
	free(p_file);
    }
}
#else

void help(char *file) {
    char fullspec[PATH_MAX], *temp, *pt;

    if ( browser[0]=='\0' )
	findbrowser();
    if ( browser[0]=='\0' ) {
	gwwv_post_error(_("No Browser"),_("Could not find a browser. Set the BROWSER environment variable to point to one"));
return;
    }

    if ( strstr(file,"http://")==NULL ) {
	memset(fullspec,0,sizeof(fullspec));
	if ( ! GFileIsAbsolute(file) )
	    snprintf(fullspec, PATH_MAX, "%s", getHelpDir());
	strcat(fullspec,file);
	if (( pt = strrchr(fullspec,'#') )!=NULL ) *pt ='\0';
	if ( !GFileReadable( fullspec )) {
	    if ( *file!='/' ) {
		strcpy(fullspec,"/usr/share/doc/fontforge/");
		strcat(fullspec,file);
		if (( pt = strrchr(fullspec,'#') )!=NULL ) *pt ='\0';
	    }
	}
	if ( !GFileReadable( fullspec )) {
	    strcpy(fullspec,"http://fontforge.sf.net/");
	    AppendSupportedLocale(fullspec);
	    strcat(fullspec,file);
	} else if ( pt!=NULL )
	    *pt = '#';
    } else
	strncpy(fullspec,file,sizeof(fullspec));
#if __Mac
    if ( strcmp(browser,"open")==0 )
	/* open doesn't want "file:" prepended */;
    else
#endif
    if ( strstr(fullspec,":/")==NULL ) {
	if ( (temp=malloc(strlen(fullspec)+strlen("file:")+20))==NULL )
	    return;
	sprintf(temp,"file:%s",fullspec);
	strncpy(fullspec,temp,sizeof(fullspec));
    fullspec[sizeof(fullspec)-1] = '\0';
	free(temp);
    }
#if __Mac
    /* This seems a bit easier... Thanks to riggle */
    if ( strcmp(browser,"open")==0 ) {
	char *str = "DYLD_LIBRARY_PATH=\"\"; open ";
	if ( (temp=malloc(strlen(str) + strlen(fullspec) + 20))==NULL )
	    return;
	sprintf( temp, "%s \"%s\" &", str, fullspec );
	system(temp);
	free(temp);
    } else {
#else
    {
#endif
	if ( (temp=malloc(strlen(browser) + strlen(fullspec) + 20))==NULL )
	    return;
	sprintf( temp, strcmp(browser,"kfmclient openURL")==0 ? "%s \"%s\" &" : "\"%s\" \"%s\" &", browser, fullspec );
	system(temp);
	free(temp);
    }
}
#endif

static void UI_IError(const char *format,...) {
    va_list ap;
    char buffer[300];
    va_start(ap,format);
    vsnprintf(buffer,sizeof(buffer),format,ap);
    GDrawIError("%s",buffer);
    va_end(ap);
}

#define MAX_ERR_LINES	400
static struct errordata {
    char *errlines[MAX_ERR_LINES];
    GFont *font;
    int fh, as;
    GGadget *vsb;
    GWindow gw, v;
    int cnt, linecnt;
    int offtop;
    int showing;
    int start_l, start_c, end_l, end_c;
    int down;
} errdata;

static void ErrHide(void) {
    GDrawSetVisible(errdata.gw,false);
    errdata.showing = false;
}

static void ErrScroll(struct sbevent *sb) {
    int newpos = errdata.offtop;

    switch( sb->type ) {
      case et_sb_top:
        newpos = 0;
      break;
      case et_sb_uppage:
        newpos -= errdata.linecnt;
      break;
      case et_sb_up:
        --newpos;
      break;
      case et_sb_down:
        ++newpos;
      break;
      case et_sb_downpage:
        newpos += errdata.linecnt;
      break;
      case et_sb_bottom:
        newpos = errdata.cnt-errdata.linecnt;
      break;
      case et_sb_thumb:
      case et_sb_thumbrelease:
        newpos = sb->pos;
      break;
    }
    if ( newpos>errdata.cnt-errdata.linecnt )
        newpos = errdata.cnt-errdata.linecnt;
    if ( newpos<0 ) newpos =0;
    if ( newpos!=errdata.offtop ) {
	errdata.offtop = newpos;
	GScrollBarSetPos(errdata.vsb,errdata.offtop);
	GDrawRequestExpose(errdata.v,NULL,false);
    }
}

static int ErrChar(GEvent *e) {
    int newpos = errdata.offtop;

    switch( e->u.chr.keysym ) {
      case GK_Home:
	newpos = 0;
      break;
      case GK_End:
	newpos = errdata.cnt-errdata.linecnt;
      break;
      case GK_Page_Up: case GK_KP_Page_Up:
	newpos -= errdata.linecnt;
      break;
      case GK_Page_Down: case GK_KP_Page_Down:
	newpos += errdata.linecnt;
      break;
      case GK_Up: case GK_KP_Up:
	--newpos;
      break;
      case GK_Down: case GK_KP_Down:
        ++newpos;
      break;
    }
    if ( newpos>errdata.cnt-errdata.linecnt )
        newpos = errdata.cnt-errdata.linecnt;
    if ( newpos<0 ) newpos =0;
    if ( newpos!=errdata.offtop ) {
	errdata.offtop = newpos;
	GScrollBarSetPos(errdata.vsb,errdata.offtop);
	GDrawRequestExpose(errdata.v,NULL,false);
return( true );
    }
return( false );
}

static int warnings_e_h(GWindow gw, GEvent *event) {

    if (( event->type==et_mouseup || event->type==et_mousedown ) &&
	    (event->u.mouse.button>=4 && event->u.mouse.button<=7) ) {
return( GGadgetDispatchEvent(errdata.vsb,event));
    }

    switch ( event->type ) {
      case et_char:
return( ErrChar(event));
      break;
      case et_expose:
      break;
      case et_resize: {
	  GRect size, sbsize;
	  GDrawGetSize(gw,&size);
	  GGadgetGetSize(errdata.vsb,&sbsize);
	  GGadgetMove(errdata.vsb,size.width-sbsize.width,0);
	  GGadgetResize(errdata.vsb,sbsize.width,size.height);
	  GDrawResize(errdata.v,size.width-sbsize.width,size.height);
	  errdata.linecnt = size.height/errdata.fh;
	  GScrollBarSetBounds(errdata.vsb,0,errdata.cnt,errdata.linecnt);
	  if ( errdata.offtop + errdata.linecnt > errdata.cnt ) {
	      errdata.offtop = errdata.cnt-errdata.linecnt;
	      if ( errdata.offtop < 0 ) errdata.offtop = 0;
	      GScrollBarSetPos(errdata.vsb,errdata.offtop);
	  }
	  GDrawRequestExpose(errdata.v,NULL,false);
      } break;
      case et_controlevent:
	switch ( event->u.control.subtype ) {
	  case et_scrollbarchange:
	    ErrScroll(&event->u.control.u.sb);
	  break;
	}
      break;
      case et_close:
	ErrHide();
      break;
      case et_create:
      break;
      case et_destroy:
      break;
    }
return( true );
}

static void noop(void *_ed) {
}

static void *genutf8data(void *_ed,int32 *len) {
    int cnt, l;
    int s_l = errdata.start_l, s_c = errdata.start_c, e_l = errdata.end_l, e_c = errdata.end_c;
    char *ret, *pt;

    if ( s_l>e_l ) {
	s_l = e_l; s_c = e_c; e_l = errdata.start_l; e_c = errdata.start_c;
    }

    if ( s_l==-1 ) {
	*len = 0;
return( copy(""));
    }

    l = s_l;
    if ( e_l == l ) {
	*len = e_c-s_c;
return( copyn( errdata.errlines[l]+s_c, e_c-s_c ));
    }

    cnt = strlen(errdata.errlines[l]+s_c)+1;
    for ( ++l; l<e_l; ++l )
	cnt += strlen(errdata.errlines[l])+1;
    cnt += e_c;

    ret = malloc(cnt+1);
    strcpy( ret, errdata.errlines[s_l]+s_c );
    pt = ret+strlen( ret );
    *pt++ = '\n';
    for ( l=s_l+1; l<e_l; ++l ) {
	strcpy(pt,errdata.errlines[l]);
	pt += strlen(pt);
	*pt++ = '\n';
    }
    strncpy(pt,errdata.errlines[l],e_c);
    *len = cnt;
return( ret );
}

static void MouseToPos(GEvent *event,int *_l, int *_c) {
    int l,c=0;

    GDrawSetFont(errdata.v,errdata.font);
    l = event->u.mouse.y/errdata.fh + errdata.offtop;
    if ( l>=errdata.cnt ) {
	l = errdata.cnt-1;
	if ( l>=0 )
	    c = strlen(errdata.errlines[l]);
    } else if ( l>=0 ) {
	GDrawLayoutInit(errdata.v,errdata.errlines[l],-1,NULL);
	c = GDrawLayoutXYToIndex(errdata.v,event->u.mouse.x-3,4);
    }
    *_l = l;
    *_c = c;
}

static void WarnMenuCopy(GWindow gw,struct gmenuitem *mi,GEvent *e) {
    GDrawGrabSelection(gw,sn_clipboard);
    GDrawAddSelectionType(gw,sn_clipboard,"UTF8_STRING",&errdata,1,
	    sizeof(char),
	    genutf8data,noop);
    GDrawAddSelectionType(gw,sn_clipboard,"STRING",&errdata,1,
	    sizeof(char),
	    genutf8data,noop);
}

static void WarnMenuClear(GWindow gw,struct gmenuitem *mi,GEvent *e) {
    int i;

    for ( i=0; i<errdata.cnt; ++i ) {
	free(errdata.errlines[i]);
	errdata.errlines[i] = NULL;
    }
    errdata.cnt = 0;
    GDrawRequestExpose(gw,NULL,false);
}

#define MID_Copy	1
#define MID_Clear	2

GMenuItem warnpopupmenu[] = {
    { { (unichar_t *) N_("Cu_t"), NULL, COLOR_DEFAULT, COLOR_DEFAULT, NULL, NULL, 1, 0, 0, 0, 0, 0, 1, 1, 0, 't' }, '\0', ksm_control, NULL, NULL, NULL, 0 },
    { { (unichar_t *) N_("_Copy"), NULL, COLOR_DEFAULT, COLOR_DEFAULT, NULL, NULL, 0, 0, 0, 0, 0, 0, 1, 1, 0, 'C' }, '\0', ksm_control, NULL, NULL, WarnMenuCopy, MID_Copy },
    { { (unichar_t *) N_("_Paste"), NULL, COLOR_DEFAULT, COLOR_DEFAULT, NULL, NULL, 1, 0, 0, 0, 0, 0, 1, 1, 0, 'P' }, '\0', ksm_control, NULL, NULL, NULL, 0 },
    { { (unichar_t *) N_("C_lear"), NULL, COLOR_DEFAULT, COLOR_DEFAULT, NULL, NULL, 0, 0, 0, 0, 0, 0, 1, 1, 0, 'l' }, 0, 0, NULL, NULL, WarnMenuClear, MID_Clear },
    GMENUITEM_EMPTY
};

static int warningsv_e_h(GWindow gw, GEvent *event) {
    int i;
    extern GBox _ggadget_Default_Box;

    if (( event->type==et_mouseup || event->type==et_mousedown ) &&
	    (event->u.mouse.button>=4 && event->u.mouse.button<=7) ) {
return( GGadgetDispatchEvent(errdata.vsb,event));
    }

    switch ( event->type ) {
      case et_expose:
	  /*GDrawFillRect(gw,&event->u.expose.rect,GDrawGetDefaultBackground(NULL));*/
	  GDrawSetFont(gw,errdata.font);
	  for ( i=0; i<errdata.linecnt && i+errdata.offtop<errdata.cnt; ++i ) {
	      int xs, xe;
	      int s_l = errdata.start_l, s_c = errdata.start_c, e_l = errdata.end_l, e_c = errdata.end_c;
	      GRect r;
	      if ( s_l>e_l ) {
		  s_l = e_l; s_c = e_c; e_l = errdata.start_l; e_c = errdata.start_c;
	      }
	      GDrawLayoutInit(gw,errdata.errlines[i+errdata.offtop],-1,NULL);
	      if ( i+errdata.offtop >= s_l && i+errdata.offtop <= e_l ) {
		  if ( i+errdata.offtop > s_l )
		      xs = 0;
		  else {
		      GRect pos;
		      GDrawLayoutIndexToPos(gw,s_c,&pos);
		      xs = pos.x+3;
		  }
		  if ( i+errdata.offtop < e_l )
		      xe = 3000;
		  else {
		      GRect pos;
		      GDrawLayoutIndexToPos(gw,s_c,&pos);
		      xe = pos.x+pos.width+3;
		  }
		  r.x = xs+3; r.width = xe-xs;
		  r.y = i*errdata.fh; r.height = errdata.fh;
		  GDrawFillRect(gw,&r,ACTIVE_BORDER);
	      }
	      GDrawLayoutDraw(gw,3,i*errdata.fh+errdata.as,MAIN_FOREGROUND);
	  }
      break;
      case et_char:
return( ErrChar(event));
      break;
      case et_mousedown:
	if ( event->u.mouse.button==3 ) {
	    warnpopupmenu[1].ti.disabled = errdata.start_l == -1;
	    warnpopupmenu[3].ti.disabled = errdata.cnt == 0;
	    GMenuCreatePopupMenu(gw,event, warnpopupmenu);
	} else {
	    if ( errdata.down )
return( true );
	    MouseToPos(event,&errdata.start_l,&errdata.start_c);
	    errdata.down = true;
	}
      case et_mousemove:
      case et_mouseup:
        if ( !errdata.down )
return( true );
	MouseToPos(event,&errdata.end_l,&errdata.end_c);
	GDrawRequestExpose(gw,NULL,false);
	if ( event->type==et_mouseup ) {
	    errdata.down = false;
	    if ( errdata.start_l == errdata.end_l && errdata.start_c == errdata.end_c ) {
		errdata.start_l = errdata.end_l = -1;
	    } else {
		GDrawGrabSelection(gw,sn_primary);
		GDrawAddSelectionType(gw,sn_primary,"UTF8_STRING",&errdata,1,
			sizeof(char),
			genutf8data,noop);
		GDrawAddSelectionType(gw,sn_primary,"STRING",&errdata,1,
			sizeof(char),
			genutf8data,noop);
	    }
	}
      break;
      case et_selclear:
	errdata.start_l = errdata.end_l = -1;
	GDrawRequestExpose(gw,NULL,false);
      break;
      case et_timer:
      break;
      case et_focus:
      break;
    }
return( true );
}

static void CreateErrorWindow(void) {
    GWindowAttrs wattrs;
    FontRequest rq;
    GRect pos,size;
    int as, ds, ld;
    GWindow gw;
    GGadgetData gd;
    extern int _GScrollBar_Width;

    GDrawGetSize(GDrawGetRoot(NULL),&size);

    memset(&wattrs,0,sizeof(wattrs));
    wattrs.mask = wam_events|wam_cursor|wam_utf8_wtitle|wam_isdlg|wam_positioned;
    wattrs.event_masks = ~(1<<et_charup);
    wattrs.is_dlg = true;
    wattrs.cursor = ct_pointer;
    wattrs.positioned = true;
    wattrs.utf8_window_title = _("Warnings");
    pos.width = GDrawPointsToPixels(NULL,GGadgetScale(400));
    pos.height = GDrawPointsToPixels(NULL,GGadgetScale(100));
    pos.x = size.width - pos.width - 10;
    pos.y = size.height - pos.height - 30;
    errdata.gw = gw = GDrawCreateTopWindow(NULL,&pos,warnings_e_h,&errdata,&wattrs);

    memset(&rq,0,sizeof(rq));
    rq.utf8_family_name = SANS_UI_FAMILIES;
    rq.point_size = 10;
    rq.weight = 400;
    errdata.font = GDrawInstanciateFont(NULL,&rq);
    errdata.font = GResourceFindFont("Warnings.Font",errdata.font);
    GDrawWindowFontMetrics(errdata.gw,errdata.font,&as,&ds,&ld);
    errdata.as = as;
    errdata.fh = as+ds;

    memset(&gd,0,sizeof(gd));
    gd.pos.y = 0; gd.pos.height = pos.height;
    gd.pos.width = GDrawPointsToPixels(gw,_GScrollBar_Width);
    gd.pos.x = pos.width-gd.pos.width;
    gd.flags = gg_visible|gg_enabled|gg_pos_in_pixels|gg_sb_vert;
    errdata.vsb = GScrollBarCreate(gw,&gd,&errdata);

    pos.width -= gd.pos.width;
    pos.x = pos.y = 0;
    wattrs.mask = wam_events|wam_cursor;
    errdata.v = GWidgetCreateSubWindow(gw,&pos,warningsv_e_h,&errdata,&wattrs);
    GDrawSetVisible(errdata.v,true);

    errdata.linecnt = pos.height/errdata.fh;
    errdata.start_l = errdata.end_l = -1;
}

static void AppendToErrorWindow(char *buffer) {
    int i,linecnt;
    char *pt,*end;

    if ( buffer[strlen(buffer)-1]=='\n' ) buffer[strlen(buffer)-1] = '\0';

    for ( linecnt=1, pt=buffer; (pt=strchr(pt,'\n'))!=NULL; ++linecnt )
	++pt;
    if ( errdata.cnt + linecnt > MAX_ERR_LINES ) {
	int off = errdata.cnt + linecnt - MAX_ERR_LINES;
	for ( i=0; i<off; ++i )
	    free(errdata.errlines[i]);
	for ( /*i=off*/; i<errdata.cnt; ++i )
	    errdata.errlines[i-off] = errdata.errlines[i];
	for ( ; i<MAX_ERR_LINES+off ; ++i )
	    errdata.errlines[i-off] = NULL;
	errdata.cnt -= off;
	if (( errdata.start_l -= off)< 0 ) errdata.start_l = errdata.start_c = 0;
	if (( errdata.end_l -= off)< 0 ) errdata.end_l = errdata.start_l = -1;
    }
    for ( i=errdata.cnt, pt=buffer; i<MAX_ERR_LINES; ++i ) {
	end = strchr(pt,'\n');
	if ( end==NULL ) end = pt+strlen(pt);
	errdata.errlines[i] = copyn(pt,end-pt);
	pt = end;
	if ( *pt=='\0' ) {
	    ++i;
    break;
	}
	++pt;
    }
    errdata.cnt = i;

    errdata.offtop = errdata.cnt - errdata.linecnt;
    if ( errdata.offtop<0 ) errdata.offtop = 0;
    GScrollBarSetBounds(errdata.vsb,0,errdata.cnt,errdata.linecnt);
    GScrollBarSetPos(errdata.vsb,errdata.offtop);
}

int ErrorWindowExists(void) {
return( errdata.gw!=NULL );
}

void ShowErrorWindow(void) {
    if ( errdata.gw==NULL )
return;
    GDrawSetVisible(errdata.gw,true);
    GDrawRaise(errdata.gw);
    if ( errdata.showing )
	GDrawRequestExpose(errdata.v,NULL,false);
    errdata.showing = true;
}

static void _LogError(const char *format,va_list ap) {
    char buffer[2500], nbuffer[2600], *str, *pt, *npt;
    vsnprintf(buffer,sizeof(buffer),format,ap);
    for ( pt=buffer, npt=nbuffer; *pt!='\0' && npt<nbuffer+sizeof(nbuffer)-2; ) {
	*npt++ = *pt++;
	if ( pt[-1]=='\n' && *pt!='\0' ) {
	    /* Force an indent of at least two spaces on secondary lines of a warning */
	    if ( npt<nbuffer+sizeof(nbuffer)-2 ) {
		*npt++ = ' ';
		if ( *pt==' ' ) ++pt;
	    }
	    if ( npt<nbuffer+sizeof(nbuffer)-2 ) {
		*npt++ = ' ';
		if ( *pt==' ' ) ++pt;
	    }
	}
    }
    *npt='\0';

    if ( no_windowing_ui || screen_display==NULL ) {
	str = utf82def_copy(nbuffer);
	fprintf(stderr,"%s",str);
	if ( str[strlen(str)-1]!='\n' )
	    putc('\n',stderr);
	free(str);
    } else {
	if ( !ErrorWindowExists())
	    CreateErrorWindow();
	AppendToErrorWindow(nbuffer);
	ShowErrorWindow();
    }
}

static void UI_LogError(const char *format,...) {
    va_list ap;

    va_start(ap,format);
    _LogError(format,ap);
    va_end(ap);
}

static void UI_post_notice(const char *title,const char *statement,...) {
    va_list ap;
    va_start(ap,statement);
    if ( no_windowing_ui ) {
	_LogError(statement,ap);
    } else {
	if ( GWidgetPostNoticeActive8(title))
	    _LogError(statement,ap);
	else
	    _GWidgetPostNotice8(title,statement,ap,40);
    }
    va_end(ap);
}

static char *UI_open_file(const char *title, const char *defaultfile,
	const char *initial_filter) {
return( gwwv_open_filename(title,defaultfile,initial_filter,NULL) );
}

static char *UI_saveas_file(const char *title, const char *defaultfile,
	const char *initial_filter) {
return( gwwv_save_filename(title,defaultfile,initial_filter) );
}

static void tinysleep(int microsecs) {
#if !defined(__MINGW32__)
    fd_set none;
    struct timeval timeout;

    FD_ZERO(&none);
    memset(&timeout,0,sizeof(timeout));
    timeout.tv_usec = microsecs;

    select(1,&none,&none,&none,&timeout);
#endif
}

static void allow_events(void) {
    GDrawSync(NULL);
    tinysleep(100);
    GDrawProcessPendingEvents(NULL);
}


struct ui_interface gdraw_ui_interface = {
    UI_IError,
    gwwv_post_error,
    UI_LogError,
    UI_post_notice,
    gwwv_ask_centered,
    gwwv_choose,
    gwwv_choose_multiple,
    gwwv_ask_string,
    gwwv_ask_password,
    UI_open_file,
    UI_saveas_file,
    gwwv_progress_start_indicator,
    gwwv_progress_end_indicator,
    gwwv_progress_show,
    gwwv_progress_enable_stop,
    gwwv_progress_next,
    gwwv_progress_next_stage,
    gwwv_progress_increment,
    gwwv_progress_change_line1,
    gwwv_progress_change_line2,
    gwwv_progress_pause_timer,
    gwwv_progress_resume_timer,
    gwwv_progress_change_stages,
    gwwv_progress_change_total,
    gwwv_progress_reset,

    allow_events,

    UI_TTFNameIds,
    UI_MSLangString,
    (int (*)(void)) Ps_StrokeFlagsDlg
};