/*
        Miscellaneous C routines used only in DOS Fractint.
*/

#include <string.h>
#ifndef XFRACT
#include <io.h>
#include <process.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <ctype.h>

  /* see Fractint.c for a description of the "include"  hierarchy */
#include "port.h"
#include "prototyp.h"
#include "fractype.h"
#include "helpdefs.h"
#include "drivers.h"

static int menu_checkkey(int curkey,int choice);

/* uncomment following for production version */
/*
#define PRODUCTION
*/
int g_release = 2099;	/* this has 2 implied decimals; increment it every synch */
int g_patch_level = 7;	/* patchlevel for DOS version */
#ifdef XFRACT
int xrelease=304;
#endif

/* int stopmsg(flags,message) displays message and waits for a key:
     message should be a max of 9 lines with \n's separating them;
       no leading or trailing \n's in message;
       no line longer than 76 chars for best appearance;
     flag options:
       &1 if already in text display mode, stackscreen is not called
          and message is displayed at (12,0) instead of (4,0)
       &2 if continue/cancel indication is to be returned;
          when not set, "Any key to continue..." is displayed
          when set, "Escape to cancel, any other key to continue..."
          -1 is returned for cancel, 0 for continue
       &4 set to suppress buzzer
       &8 for Fractint for Windows & parser - use a fixed pitch font
      &16 for info only message (green box instead of red in DOS vsn)
   */
int stopmsg (int flags, char *msg)
{
   int ret,toprow,color,savelookatmouse;
   static unsigned char batchmode = 0;
   if (debugflag != 0 || initbatch >= 1)
   {
      static FILE *fp = NULL;
      if (fp==NULL && initbatch == 0)
         fp=dir_fopen(workdir,"stopmsg.txt","w");
      else
         fp=dir_fopen(workdir,"stopmsg.txt","a");
      if (fp != NULL)
      fprintf(fp,"%s\n",msg);
      fclose(fp);
   }
   if (first_init) {     /* & cmdfiles hasn't finished 1st try */
#ifdef XFRACT
      driver_set_for_text();
      driver_buzzer(BUZZER_ERROR);
      driver_put_string(0,0,15, "*** Error during startup:");
      driver_put_string(2,0,15,msg);
      driver_move_cursor(8,0);
#if !defined(WIN32)
      sleep(1);
#endif
      close_drivers();
      exit(1);
#else
      printf("%s\n",msg);
      dopause(1); /* pause deferred until after cmdfiles */
      return(0);
#endif
      }
   if (initbatch >= 1 || batchmode) { /* in batch mode */
      initbatch = 4; /* used to set errorlevel */
      batchmode = 1; /* fixes *second* stopmsg in batch mode bug */
      return (-1);
      }
   ret = 0;
   savelookatmouse = lookatmouse;
   lookatmouse = -13;
   if ((flags & STOPMSG_NO_STACK))
      blankrows(toprow=12,10,7);
   else {
      driver_stack_screen();
      toprow = 4;
      driver_move_cursor(4,0);
      }
   g_text_cbase = 2; /* left margin is 2 */
   driver_put_string(toprow,0,7,msg);
   if (flags & STOPMSG_CANCEL)
      driver_put_string(g_text_row+2,0,7, "Escape to cancel, any other key to continue...");
   else
      driver_put_string(g_text_row+2,0,7, "Any key to continue...");
   g_text_cbase = 0; /* back to full line */
   color = (flags & STOPMSG_INFO_ONLY) ? C_STOP_INFO : C_STOP_ERR;
   driver_set_attr(toprow,0,color,(g_text_row+1-toprow)*80);
   driver_hide_text_cursor();   /* cursor off */
   if ((flags & STOPMSG_NO_BUZZER) == 0)
      driver_buzzer((flags & STOPMSG_INFO_ONLY) ? 0 : 2);
   while (driver_key_pressed()) /* flush any keyahead */
      driver_get_key();
   if (debugflag != 324)
      if (getakeynohelp() == FIK_ESC)
         ret = -1;
   if ((flags & STOPMSG_NO_STACK))
      blankrows(toprow,10,7);
   else
      driver_unstack_screen();
   lookatmouse = savelookatmouse;
   return ret;
}


static U16 temptextsave = 0;
static int  textxdots,textydots;

/* texttempmsg(msg) displays a text message of up to 40 characters, waits
      for a key press, restores the prior display, and returns (without
      eating the key).
      It works in almost any video mode - does nothing in some very odd cases
      (HCGA hi-res with old bios), or when there isn't 10k of temp mem free. */
int texttempmsg(char *msgparm)
{
	if (showtempmsg(msgparm))
	{
		return -1;
	}

	driver_wait_key_pressed(0); /* wait for a keystroke but don't eat it */
	cleartempmsg();
	return 0;
}

void freetempmsg()
{
	if (temptextsave != 0)
	{
		MemoryRelease(temptextsave);
	}
	temptextsave = 0;
}

int showtempmsg(char *msgparm)
{
	static long size = 0;
	char msg[41];
	BYTE buffer[640];
	BYTE *fontptr = NULL;
	int i;
	int xrepeat = 0;
	int yrepeat = 0;
	int save_sxoffs, save_syoffs;

	strncpy(msg, msgparm, 40);
	msg[40] = 0; /* ensure max message len of 40 chars */
	if (driver_diskp())  /* disk video, screen in text mode, easy */
	{
		dvid_status(0, msg);
		return 0;
	}
	if (first_init)      /* & cmdfiles hasn't finished 1st try */
	{
		printf("%s\n", msg);
		return 0;
	}

	xrepeat = (sxdots >= 640) ? 2 : 1;
	yrepeat = (sydots >= 300) ? 2 : 1;
	textxdots = (int) strlen(msg) * xrepeat * 8;
	textydots = yrepeat * 8;

	/* worst case needs 10k */
	if (temptextsave != 0)
	{
		if (size != (long) textxdots * (long) textydots)
		{
			freetempmsg();
		}
	}
	size = (long) textxdots * (long) textydots;
	save_sxoffs = sxoffs;
	save_syoffs = syoffs;
	if (g_video_scroll)
	{
		sxoffs = g_video_start_x;
		syoffs = g_video_start_y;
	}
	else
	{
		sxoffs = syoffs = 0;
	}
	if (temptextsave == 0) /* only save screen first time called */
	{
		/* TODO: MemoryAlloc, MoveToMemory */
		temptextsave = MemoryAlloc((U16)textxdots, (long)textydots, MEMORY);
		if (temptextsave == 0)
		{
			return -1; /* sorry, message not displayed */
		}
		for (i = 0; i < textydots; ++i)
		{
			get_line(i, 0, textxdots-1, buffer);
			MoveToMemory(buffer, (U16)textxdots, 1L, (long)i, temptextsave);
		}
	}

	find_special_colors(); /* get g_color_dark & g_color_medium set */
	driver_display_string(0, 0, g_color_medium, g_color_dark, msg);
	sxoffs = save_sxoffs;
	syoffs = save_syoffs;

	return 0;
}

void cleartempmsg()
{
	BYTE buffer[640];
	int i;
	int save_sxoffs, save_syoffs;
	if (driver_diskp()) /* disk video, easy */
	{
		dvid_status(0, "");
	}
	else if (temptextsave != 0)
	{
		save_sxoffs = sxoffs;
		save_syoffs = syoffs;
		if (g_video_scroll)
		{
			sxoffs = g_video_start_x;
			syoffs = g_video_start_y;
		}
		else
		{
			sxoffs = syoffs = 0;
		}
		for (i = 0; i < textydots; ++i)
		{
			MoveFromMemory(buffer, (U16)textxdots, 1L, (long)i, temptextsave);
			put_line(i, 0, textxdots-1, buffer);
		}
		if (using_jiim == 0)  /* jiim frees memory with freetempmsg() */
		{
			MemoryRelease(temptextsave);
			temptextsave = 0;
		}
		sxoffs = save_sxoffs;
		syoffs = save_syoffs;
	}
}

void blankrows(int row,int rows,int attr)
{
   char buf[81];
   memset(buf,' ',80);
   buf[80] = 0;
   while (--rows >= 0)
      driver_put_string(row++,0,attr,buf);
}

void helptitle()
{
   char msg[MSGLEN],buf[MSGLEN];
   driver_set_clear(); /* clear the screen */
#ifdef XFRACT
   sprintf(msg,"XFRACTINT  Version %d.%02d (FRACTINT Version %d.%02d)",
           xrelease/100,xrelease%100, g_release/100,g_release%100);
#else
   *msg=0;
#endif   
   sprintf(buf,"FRACTINT Version %d.%01d",g_release/100,(g_release%100)/10);
   strcat(msg,buf);
   if (g_release%10) {
      sprintf(buf,"%01d",g_release%10);
      strcat(msg,buf);
      }
   if (g_patch_level) {
      sprintf(buf,".%d",g_patch_level);
      strcat(msg,buf);
      }
   putstringcenter(0,0,80,C_TITLE,msg);
   
/* uncomment next for production executable: */
#if defined(PRODUCTION) || defined(XFRACT)
    return;
   /*NOTREACHED*/
#else
   if (debugflag == 3002) return;
#define DEVELOPMENT
#ifdef DEVELOPMENT
   driver_put_string(0, 2, C_TITLE_DEV, "Development Version");
#else
   driver_put_string(0, 3, C_TITLE_DEV, "Customized Version");
#endif
   driver_put_string(0, 55, C_TITLE_DEV, "Not for Public Release");
#endif
}


void footer_msg(int *i, int options, char *speedstring)
{
   putstringcenter((*i)++, 0, 80, C_PROMPT_BKGRD,
      (speedstring) ? "Use the cursor keys or type a value to make a selection"
		: "Use the cursor keys to highlight your selection");
   putstringcenter(*(i++), 0, 80, C_PROMPT_BKGRD,
         (options & CHOICE_MENU) ? "Press ENTER for highlighted choice, or "FK_F1" for help"
      : ((options & CHOICE_HELP) ? "Press ENTER for highlighted choice, ESCAPE to back out, or F1 for help"
	  : "Press ENTER for highlighted choice, or ESCAPE to back out"));
}

int putstringcenter(int row, int col, int width, int attr, char *msg)
{
   char buf[81];
   int i,j,k;
   i = 0;
#ifdef XFRACT
   if (width>=80) width=79; /* Some systems choke in column 80 */
#endif
   while (msg[i]) ++i; /* strlen for a */
   if (i == 0) return(-1);
   if (i >= width) i = width - 1; /* sanity check */
   j = (width - i) / 2;
   j -= (width + 10 - i) / 20; /* when wide a bit left of center looks better */
   memset(buf,' ',width);
   buf[width] = 0;
   i = 0;
   k = j;
   while (msg[i]) buf[k++] = msg[i++]; /* strcpy for a */
   driver_put_string(row,col,attr,buf);
   return j;
}

/* ------------------------------------------------------------------------ */

char speed_prompt[]="Speed key string";

/* For file list purposes only, it's a directory name if first 
   char is a dot or last char is a slash */
static int isadirname(char *name)
{
   if (*name == '.' || endswithslash(name))
      return 1;
   else
      return 0;
}

void show_speedstring(int speedrow,
                   char *speedstring,
                   int (*speedprompt)(int,int,int,char *,int))
{
   int speed_match = 0;
   int i,j;
   char buf[81];
   memset(buf,' ',80);
   buf[80] = 0;
   driver_put_string(speedrow,0,C_PROMPT_BKGRD,buf);
   if (*speedstring) {                 /* got a speedstring on the go */
      driver_put_string(speedrow,15,C_CHOICE_SP_INSTR," ");
      if (speedprompt)
         j = speedprompt(speedrow,16,C_CHOICE_SP_INSTR,speedstring,speed_match);
      else {
         driver_put_string(speedrow,16,C_CHOICE_SP_INSTR,speed_prompt);
         j = sizeof(speed_prompt)-1;
         }
      strcpy(buf,speedstring);
      i = (int) strlen(buf);
      while (i < 30)
         buf[i++] = ' ';
      buf[i] = 0;
      driver_put_string(speedrow,16+j,C_CHOICE_SP_INSTR," ");
      driver_put_string(speedrow,17+j,C_CHOICE_SP_KEYIN,buf);
      driver_move_cursor(speedrow,17+j+(int) strlen(speedstring));
      }
   else
      driver_hide_text_cursor();
}

void process_speedstring(char    *speedstring,
                        char **choices,         /* array of choice strings                */
                        int       curkey,
                        int      *pcurrent,
                        int       numchoices,
                        int       is_unsorted)
{
   int i, comp_result;

   i = (int) strlen(speedstring);
   if (curkey == 8 && i > 0) /* backspace */
      speedstring[--i] = 0;
   if (33 <= curkey && curkey <= 126 && i < 30)
   {
#ifndef XFRACT
      curkey = tolower(curkey);
#endif
      speedstring[i] = (char)curkey;
      speedstring[++i] = 0;
   }
   if (i > 0)  {    /* locate matching type */
      *pcurrent = 0;
      while (*pcurrent < numchoices
        && (comp_result = strncasecmp(speedstring,choices[*pcurrent],i))!=0) {
         if (comp_result < 0 && !is_unsorted) {
            *pcurrent -= *pcurrent ? 1 : 0;
            break;
         }
         else
           ++*pcurrent;
      }
      if (*pcurrent >= numchoices) /* bumped end of list */
         *pcurrent = numchoices - 1;
            /*if the list is unsorted, and the entry found is not the exact
              entry, then go looking for the exact entry.
            */
      else if (is_unsorted && choices[*pcurrent][i]) {
         int temp = *pcurrent;
         while (++temp < numchoices) {
            if (!choices[temp][i] && !strncasecmp(speedstring, choices[temp], i)) {
               *pcurrent = temp;
               break;
            }
         }
      }
   }
}


int fullscreen_choice(
    int options,                  /* &2 use menu coloring scheme            */
                                  /* &4 include F1 for help in instructions */
                                  /* &8 add caller's instr after normal set */
                                  /* &16 menu items up one line             */
    char *hdg,                /* heading info, \n delimited             */
    char *hdg2,               /* column heading or NULL                 */
    char *instr,              /* instructions, \n delimited, or NULL    */
    int numchoices,               /* How many choices in list               */
    char **choices,         /* array of choice strings                */
    int *attributes,          /* &3: 0 normal color, 1,3 highlight      */
                                  /* &256 marks a dummy entry               */
    int boxwidth,                 /* box width, 0 for calc (in items)       */
    int boxdepth,                 /* box depth, 0 for calc, 99 for max      */
    int colwidth,                 /* data width of a column, 0 for calc     */
    int current,                  /* start with this item                   */
    void (*formatitem)(int,char*),/* routine to display an item or NULL     */
    char *speedstring,            /* returned speed key value, or NULL      */
    int (*speedprompt)(int,int,int,char *,int),/* routine to display prompt or NULL      */
    int (*checkkey)(int,int)      /* routine to check keystroke or NULL     */
)
    /* return is: n>=0 for choice n selected,
                  -1 for escape
                  k for checkkey routine return value k (if not 0 nor -1)
                  speedstring[0] != 0 on return if string is present
    */
{
	int titlelines, titlewidth;
	int reqdrows;
	int topleftrow, topleftcol;
	int topleftchoice;
	int speedrow = 0;  /* speed key prompt */
	int boxitems;      /* boxwidth*boxdepth */
	int curkey, increment, rev_increment = 0;
	int redisplay;
	int i, j, k = 0;
	char *charptr;
	char buf[81];
	char curitem[81];
	char *itemptr;
	int ret, savelookatmouse;
	int scrunch;  /* scrunch up a line */

	scrunch = (options & CHOICE_CRUNCH) ? 1 : 0;
	savelookatmouse = lookatmouse;
	lookatmouse = 0;
	ret = -1;
	/* preset current to passed string */
	if (speedstring && (i = (int) strlen(speedstring)) > 0)
	{ 
		current = 0;
		if (options & CHOICE_NOT_SORTED)
		{
			while (current < numchoices && (k = strncasecmp(speedstring, choices[current], i)) != 0)
			{
				++current;
			}
			if (k != 0)
			{
				current = 0;
			}
		}
		else
		{
			while (current < numchoices && (k = strncasecmp(speedstring,choices[current],i)) > 0)
			{
				++current;
			}
			if (k < 0 && current > 0)  /* oops - overshot */
			{
				--current;
			}
		}
		if (current >= numchoices) /* bumped end of list */
		{
			current = numchoices - 1;
		}
	}

	for (;;)
	{
		if (current >= numchoices)  /* no real choice in the list? */
		{
			goto fs_choice_end;
		}
		if ((attributes[current] & 256) == 0)
		{
			break;
		}
		++current;                  /* scan for a real choice */
	}

	titlelines = titlewidth = 0;
	if (hdg)
	{
		charptr = hdg;              /* count title lines, find widest */
		i = 0;
		titlelines = 1;
		while (*charptr)
		{
			if (*(charptr++) == '\n')
			{
				++titlelines;
				i = -1;
			}
			if (++i > titlewidth)
			{
				titlewidth = i;
			}
		}
	}

	if (colwidth == 0)             /* find widest column */
	{
		for (i = 0; i < numchoices; ++i)
		{
			int len;
			if ((len = (int) strlen(choices[i])) > colwidth)
			{
				colwidth = len;
			}
		}
	}
	/* title(1), blank(1), hdg(n), blank(1), body(n), blank(1), instr(?) */
	reqdrows = 3 - scrunch;                /* calc rows available */
	if (hdg)
	{
		reqdrows += titlelines + 1;
	}
	if (instr)                   /* count instructions lines */
	{
		charptr = instr;
		++reqdrows;
		while (*charptr)
		{
			if (*(charptr++) == '\n')
			{
				++reqdrows;
			}
		}
		if ((options & CHOICE_INSTRUCTIONS))          /* show std instr too */
		{
			reqdrows += 2;
		}
	}
	else
	{
		reqdrows += 2;              /* standard instructions */
	}
	if (speedstring)
	{
		++reqdrows;   /* a row for speedkey prompt */
	}
	if (boxdepth > (i = 25 - reqdrows)) /* limit the depth to max */
	{
		boxdepth = i;
	}
	if (boxwidth == 0)           /* pick box width and depth */
	{
		if (numchoices <= i - 2)  /* single column is 1st choice if we can */
		{
			boxdepth = numchoices;
			boxwidth = 1;
		}
		else
		{                      /* sort-of-wide is 2nd choice */
			boxwidth = 60 / (colwidth + 1);
			if (boxwidth == 0
			|| (boxdepth = (numchoices + boxwidth - 1)/boxwidth) > i - 2)
			{
				boxwidth = 80 / (colwidth + 1); /* last gasp, full width */
				if ((boxdepth = (numchoices + boxwidth - 1)/boxwidth) > i)
				{
					boxdepth = i;
				}
			}
		}
	}
#if 0
	if ((i = 77 / boxwidth - colwidth) > 3) /* spaces to add @ left each choice */
	{
		i = 3;
	}
	if (i == 0)
	{
		i = 1;
	}
#else
	i = (80 / boxwidth - colwidth) / 2 - 1;
	if (i == 0) /* to allow wider prompts */
	{
		i = 1;
	}
	if (i < 0)
	{
		i = 0;
	}
	if (i > 3)
	{
		i = 3;
	}
#endif
	j = boxwidth * (colwidth += i) + i;     /* overall width of box */
	if (j < titlewidth+2)
	{
		j = titlewidth + 2;
	}
	if (j > 80)
	{
		j = 80;
	}
	if (j <= 70 && boxwidth == 2)         /* special case makes menus nicer */
	{
		++j;
		++colwidth;
    }
	k = (80 - j) / 2;                       /* center the box */
	k -= (90 - j) / 20;
	topleftcol = k + i;                     /* column of topleft choice */
	i = (25 - reqdrows - boxdepth) / 2;
	i -= i / 4;                             /* higher is better if lots extra */
	topleftrow = 3 + titlelines + i;        /* row of topleft choice */

	/* now set up the overall display */
	helptitle();                            /* clear, display title line */
	driver_set_attr(1, 0, C_PROMPT_BKGRD, 24*80);      /* init rest to background */
	for (i = topleftrow - 1 - titlelines; i < topleftrow + boxdepth + 1; ++i)
	{
		driver_set_attr(i, k, C_PROMPT_LO, j);          /* draw empty box */
	}
	if (hdg)
	{
		g_text_cbase = (80 - titlewidth) / 2;   /* set left margin for putstring */
		g_text_cbase -= (90 - titlewidth) / 20; /* put heading into box */
		driver_put_string(topleftrow - titlelines - 1, 0, C_PROMPT_HI, hdg);
		g_text_cbase = 0;
	}
	if (hdg2)                               /* display 2nd heading */
	{
		driver_put_string(topleftrow - 1, topleftcol, C_PROMPT_MED, hdg2);
	}
	i = topleftrow + boxdepth + 1;
	if (instr == NULL || (options & CHOICE_INSTRUCTIONS))   /* display default instructions */
	{
		if (i < 20)
		{
			++i;
		}
		if (speedstring)
		{
			speedrow = i;
			*speedstring = 0;
			if (++i < 22)
			{
				++i;
			}
		}
		i -= scrunch;
		footer_msg(&i, options, speedstring);
	}
	if (instr)                            /* display caller's instructions */
	{
		charptr = instr;
		j = -1;
		while ((buf[++j] = *(charptr++)) != 0)
		{
			if (buf[j] == '\n')
			{
				buf[j] = 0;
				putstringcenter(i++, 0, 80, C_PROMPT_BKGRD, buf);
				j = -1;
			}
		}
		putstringcenter(i, 0, 80, C_PROMPT_BKGRD, buf);
	}

	boxitems = boxwidth * boxdepth;
	topleftchoice = 0;                      /* pick topleft for init display */
	while (current - topleftchoice >= boxitems
		|| (current - topleftchoice > boxitems/2
			&& topleftchoice + boxitems < numchoices))
	{
		topleftchoice += boxwidth;
	}
	redisplay = 1;
	topleftrow -= scrunch;
	for (;;) /* main loop */
	{
		if (redisplay)                       /* display the current choices */
		{
			memset(buf, ' ', 80);
			buf[boxwidth*colwidth] = 0;
			for (i = (hdg2) ? 0 : -1; i <= boxdepth; ++i)  /* blank the box */
			{
				driver_put_string(topleftrow + i, topleftcol, C_PROMPT_LO, buf);
			}
			for (i = 0; i + topleftchoice < numchoices && i < boxitems; ++i)
			{
				/* display the choices */
				k = attributes[j = i + topleftchoice] & 3;
				if (k == 1)
				{
					k = C_PROMPT_LO;
				}
				else if (k == 3)
				{
					k = C_PROMPT_HI;
				}
				else
				{
					k = C_PROMPT_MED;
				}
				if (formatitem)
				{
					(*formatitem)(j, buf);
					charptr=buf;
				}
				else
				{
					charptr = choices[j];
				}
				driver_put_string(topleftrow + i/boxwidth, topleftcol + (i % boxwidth)*colwidth,
						k, charptr);
			}
			/***
			... format differs for summary/detail, whups, force box width to
			...  be 72 when detail toggle available?  (2 grey margin each
			...  side, 1 blue margin each side)
			***/
			if (topleftchoice > 0 && hdg2 == NULL)
			{
				driver_put_string(topleftrow - 1, topleftcol, C_PROMPT_LO, "(more)");
			}
			if (topleftchoice + boxitems < numchoices)
			{
				driver_put_string(topleftrow + boxdepth, topleftcol, C_PROMPT_LO, "(more)");
			}
			redisplay = 0;
		}

		i = current - topleftchoice;           /* highlight the current choice */
		if (formatitem)
		{
			(*formatitem)(current, curitem);
			itemptr = curitem;
		}
		else
		{
			itemptr = choices[current];
		}
		driver_put_string(topleftrow + i/boxwidth, topleftcol + (i % boxwidth)*colwidth,
					C_CHOICE_CURRENT, itemptr);

		if (speedstring)                     /* show speedstring if any */
		{
			show_speedstring(speedrow, speedstring, speedprompt);
		}
		else
		{
			driver_hide_text_cursor();
		}

		driver_wait_key_pressed(0); /* enables help */
		curkey = driver_get_key();
#ifdef XFRACT
		if (curkey == FIK_F10)
		{
			curkey = ')';
		}
		if (curkey == FIK_F9)
		{
			curkey = '(';
		}
		if (curkey == FIK_F8)
		{
			curkey = '*';
		}
#endif

		i = current - topleftchoice;           /* unhighlight current choice */
		k = attributes[current] & 3;
		if (k == 1)
		{
			k = C_PROMPT_LO;
		}
		else if (k == 3)
		{
			k = C_PROMPT_HI;
		}
		else
		{
			k = C_PROMPT_MED;
		}
		driver_put_string(topleftrow + i/boxwidth, topleftcol + (i % boxwidth)*colwidth,
					k, itemptr);

		increment = 0;
		switch (curkey)
		{                      /* deal with input key */
        case FIK_ENTER:
        case FIK_ENTER_2:
			ret = current;
			goto fs_choice_end;
        case FIK_ESC:
			goto fs_choice_end;
        case FIK_DOWN_ARROW:
			rev_increment = 0 - (increment = boxwidth);
			break;
        case FIK_CTL_DOWN_ARROW:
			rev_increment = 0 - (increment = boxwidth);
			{
				int newcurrent = current;
				while ((newcurrent += boxwidth) != current)
				{
					if (newcurrent >= numchoices)
					{
						newcurrent = (newcurrent % boxwidth) - boxwidth;
					}
					else if (!isadirname(choices[newcurrent]))
					{
						if (current != newcurrent)
						{
							current = newcurrent - boxwidth;
						}
						break;  /* breaks the while loop */
					}
				}
			}
			break;
        case FIK_UP_ARROW:
			increment = 0 - (rev_increment = boxwidth);
			break;
        case FIK_CTL_UP_ARROW:
			increment = 0 - (rev_increment = boxwidth);
			{
				int newcurrent = current;
				while ((newcurrent-=boxwidth) != current)
				{
					if (newcurrent < 0)
					{
						newcurrent = (numchoices - current) % boxwidth;
						newcurrent =  numchoices + (newcurrent ? boxwidth - newcurrent: 0);
					}
					else if (!isadirname(choices[newcurrent]))
					{
						if (current != newcurrent)
						{
							current = newcurrent + boxwidth;
						}
						break;  /* breaks the while loop */
					}
				}
			}
			break;
        case FIK_RIGHT_ARROW:
			increment = 1; rev_increment = -1;
			break;
         case FIK_CTL_RIGHT_ARROW:  /* move to next file; if at last file, go to
                                 first file */
			increment = 1; rev_increment = -1;
			{
				int newcurrent = current;
				while (++newcurrent != current)
				{
					if (newcurrent >= numchoices)
					{
						newcurrent = -1;
					}
					else if (!isadirname(choices[newcurrent]))
					{
						if (current != newcurrent)
						{
							current = newcurrent - 1;
						}
						break;  /* breaks the while loop */
					}
				}
			}
			break;
		case FIK_LEFT_ARROW:
			increment = -1; rev_increment = 1;
			break;
        case FIK_CTL_LEFT_ARROW: /* move to previous file; if at first file, go to
                               last file */
			increment = -1; rev_increment = 1;
			{
				int newcurrent = current;
				while (--newcurrent != current)
				{
					if (newcurrent < 0)
					{
						newcurrent = numchoices;
					}
					else if (!isadirname(choices[newcurrent]))
					{
						if (current != newcurrent)
						{
							current = newcurrent + 1;
						}
						break;  /* breaks the while loop */
					}
				}
			}
            break;
        case FIK_PAGE_UP:
			if (numchoices > boxitems)
			{
				topleftchoice -= boxitems;
				increment = -boxitems;
				rev_increment = boxwidth;
				redisplay = 1;
			}
			break;
        case FIK_PAGE_DOWN:
			if (numchoices > boxitems)
			{
				topleftchoice += boxitems;
				increment = boxitems;
				rev_increment = -boxwidth;
				redisplay = 1;
			}
			break;
        case FIK_HOME:
			current = -1;
			increment = rev_increment = 1;
			break;
        case FIK_CTL_HOME:
			current = -1;
			increment = rev_increment = 1;
			{
				int newcurrent;
				for (newcurrent = 0; newcurrent < numchoices; ++newcurrent)
				{
					if (!isadirname(choices[newcurrent]))
					{
						current = newcurrent - 1;
						break;  /* breaks the for loop */
					}
				}
			}
			break;
		case FIK_END:
			current = numchoices;
			increment = rev_increment = -1;
			break;
		case FIK_CTL_END:
			current = numchoices;
			increment = rev_increment = -1;
			{
				int newcurrent;
				for (newcurrent = numchoices - 1; newcurrent >= 0; --newcurrent)
				{
					if (!isadirname(choices[newcurrent]))
					{
						current = newcurrent + 1;
						break;  /* breaks the for loop */
					}
				}
			}
			break;
        default:
			if (checkkey)
			{
				if ((ret = (*checkkey)(curkey, current)) < -1 || ret > 0)
				{
					goto fs_choice_end;
				}
				if (ret == -1)
				{
					redisplay = -1;
				}
			}
			ret = -1;
			if (speedstring)
			{
				process_speedstring(speedstring, choices, curkey, &current,
						numchoices, options & CHOICE_NOT_SORTED);
			}
			break;
		}
		if (increment)                  /* apply cursor movement */
		{
			current += increment;
			if (speedstring)               /* zap speedstring */
			{
				speedstring[0] = 0;
			}
		}
		for (;;)
		{                 /* adjust to a non-comment choice */
			if (current < 0 || current >= numchoices)
			{
				increment = rev_increment;
			}
			else if ((attributes[current] & 256) == 0)
			{
				break;
			}
			current += increment;
		}
		if (topleftchoice > numchoices - boxitems)
		{
			topleftchoice = ((numchoices + boxwidth - 1)/boxwidth)*boxwidth - boxitems;
		}
		if (topleftchoice < 0)
		{
			topleftchoice = 0;
		}
		while (current < topleftchoice)
		{
			topleftchoice -= boxwidth;
			redisplay = 1;
		}
		while (current >= topleftchoice + boxitems)
		{
			topleftchoice += boxwidth;
			redisplay = 1;
		}
	}

fs_choice_end:
	lookatmouse = savelookatmouse;
	return ret;
}

#ifndef XFRACT
/* case independent version of strncmp */
int strncasecmp(char *s,char *t,int ct)
{
   for (; (tolower(*s) == tolower(*t)) && --ct ; s++,t++)
      if (*s == '\0')
         return(0);
   return(tolower(*s) - tolower(*t));
}
#endif

static int menutype;
#define MENU_HDG 3
#define MENU_ITEM 1

int main_menu(int fullmenu)
{
	char *choices[44]; /* 2 columns * 22 rows */
	int attributes[44];
	int choicekey[44];
	int i;
	int nextleft, nextright;
	int oldtabmode;
	int showjuliatoggle;
	oldtabmode = tabmode;

top:
	menutype = fullmenu;
	tabmode = 0;
	showjuliatoggle = 0;
	for (i = 0; i < 44; ++i)
	{
		attributes[i] = 256;
		choices[i] = "";
		choicekey[i] = -1;
	}
	nextleft = -2;
	nextright = -1;

	if (fullmenu)
	{
		nextleft += 2;
		choices[nextleft] = "      CURRENT IMAGE         ";
		attributes[nextleft] = 256+MENU_HDG;

		nextleft += 2;
		choicekey[nextleft] = 13; /* enter */
		attributes[nextleft] = MENU_ITEM;
		choices[nextleft] = (calc_status == CALCSTAT_RESUMABLE) ?
			"continue calculation        " :
			"return to image             ";

		nextleft += 2;
		choicekey[nextleft] = 9; /* tab */
		attributes[nextleft] = MENU_ITEM;
		choices[nextleft] = "info about image      <tab> ";

		nextleft += 2;
		choicekey[nextleft] = 'o';
		attributes[nextleft] = MENU_ITEM;
		choices[nextleft] = "orbits window          <o>  ";
		if (!(fractype==JULIA || fractype==JULIAFP || fractype==INVERSEJULIA))
		{
			nextleft += 2;
		}
	}

	nextleft += 2;
	choices[nextleft] = "      NEW IMAGE             ";
	attributes[nextleft] = 256+MENU_HDG;

	nextleft += 2;
	choicekey[nextleft] = FIK_DELETE;
	attributes[nextleft] = MENU_ITEM;
#ifdef XFRACT
	choices[nextleft] = "draw fractal           <D>  ";
#else
	choices[nextleft] = "select video mode...  <del> ";
#endif

	nextleft += 2;
	choicekey[nextleft] = 't';
	attributes[nextleft] = MENU_ITEM;
	choices[nextleft] = "select fractal type    <t>  ";

	if (fullmenu)
	{
		if ((curfractalspecific->tojulia != NOFRACTAL
			&& param[0] == 0.0 && param[1] == 0.0)
			|| curfractalspecific->tomandel != NOFRACTAL)
		{
			nextleft += 2;
			choicekey[nextleft] = FIK_SPACE;
			attributes[nextleft] = MENU_ITEM;
			choices[nextleft] = "toggle to/from julia <space>";
			showjuliatoggle = 1;
		}
		if (fractype==JULIA || fractype==JULIAFP || fractype==INVERSEJULIA)
		{
			nextleft += 2;
			choicekey[nextleft] = 'j';
			attributes[nextleft] = MENU_ITEM;
			choices[nextleft] = "toggle to/from inverse <j>  ";
			showjuliatoggle = 1;
		}

		nextleft += 2;
		choicekey[nextleft] = 'h';
		attributes[nextleft] = MENU_ITEM;
		choices[nextleft] = "return to prior image  <h>   ";

		nextleft += 2;
		choicekey[nextleft] = FIK_BACKSPACE;
		attributes[nextleft] = MENU_ITEM;
		choices[nextleft] = "reverse thru history <ctl-h> ";
	}
	else
	{
		nextleft += 2;
	}

	nextleft += 2;
	choices[nextleft] = "      OPTIONS                ";
	attributes[nextleft] = 256+MENU_HDG;

	nextleft += 2;
	choicekey[nextleft] = 'x';
	attributes[nextleft] = MENU_ITEM;
	choices[nextleft] = "basic options...       <x>  ";

	nextleft += 2;
	choicekey[nextleft] = 'y';
	attributes[nextleft] = MENU_ITEM;
	choices[nextleft] = "extended options...    <y>  ";

	nextleft += 2;
	choicekey[nextleft] = 'z';
	attributes[nextleft] = MENU_ITEM;
	choices[nextleft] = "type-specific parms... <z>  ";

	nextleft += 2;
	choicekey[nextleft] = 'p';
	attributes[nextleft] = MENU_ITEM;
	choices[nextleft] = "passes options...      <p>  ";

	nextleft += 2;
	choicekey[nextleft] = 'v';
	attributes[nextleft] = MENU_ITEM;
	choices[nextleft] = "view window options... <v>  ";

	if (showjuliatoggle == 0)
	{
		nextleft += 2;
		choicekey[nextleft] = 'i';
		attributes[nextleft] = MENU_ITEM;
		choices[nextleft] = "fractal 3D parms...    <i>  ";
	}

	nextleft += 2;
	choicekey[nextleft] = FIK_CTL_B;
	attributes[nextleft] = MENU_ITEM;
	choices[nextleft] = "browse parms...      <ctl-b>";

	if (fullmenu)
	{
		nextleft += 2;
		choicekey[nextleft] = FIK_CTL_E;
		attributes[nextleft] = MENU_ITEM;
		choices[nextleft] = "evolver parms...     <ctl-e>";

#ifndef XFRACT
		nextleft += 2;
		choicekey[nextleft] = FIK_CTL_F;
		attributes[nextleft] = MENU_ITEM;
		choices[nextleft] = "sound parms...       <ctl-f>";
#endif
	}

	nextright += 2;
	attributes[nextright] = 256 + MENU_HDG;
	choices[nextright] = "        FILE                  ";

	nextright += 2;
	choicekey[nextright] = '@';
	attributes[nextright] = MENU_ITEM;
	choices[nextright] = "run saved command set... <@>  ";

	if (fullmenu)
	{
		nextright += 2;
		choicekey[nextright] = 's';
		attributes[nextright] = MENU_ITEM;
		choices[nextright] = "save image to file       <s>  ";
	}

	nextright += 2;
	choicekey[nextright] = 'r';
	attributes[nextright] = MENU_ITEM;
	choices[nextright] = "load image from file...  <r>  ";

	nextright += 2;
	choicekey[nextright] = '3';
	attributes[nextright] = MENU_ITEM;
	choices[nextright] = "3d transform from file...<3>  ";

	if (fullmenu)
	{
		nextright += 2;
		choicekey[nextright] = '#';
		attributes[nextright] = MENU_ITEM;
		choices[nextright] = "3d overlay from file.....<#>  ";

		nextright += 2;
		choicekey[nextright] = 'b';
		attributes[nextright] = MENU_ITEM;
		choices[nextright] = "save current parameters..<b>  ";

		nextright += 2;
		choicekey[nextright] = 16;
		attributes[nextright] = MENU_ITEM;
		choices[nextright] = "print image          <ctl-p>  ";
	}

	nextright += 2;
	choicekey[nextright] = 'd';
	attributes[nextright] = MENU_ITEM;
#ifdef XFRACT
	choices[nextright] = "shell to Linux/Unix      <d>  ";
#else
	choices[nextright] = "shell to dos             <d>  ";
#endif

	nextright += 2;
	choicekey[nextright] = 'g';
	attributes[nextright] = MENU_ITEM;
	choices[nextright] = "give command string      <g>  ";

	nextright += 2;
	choicekey[nextright] = FIK_ESC;
	attributes[nextright] = MENU_ITEM;
	choices[nextright] = "quit "FRACTINT"           <esc> ";

	nextright += 2;
	choicekey[nextright] = FIK_INSERT;
	attributes[nextright] = MENU_ITEM;
	choices[nextright] = "restart "FRACTINT"        <ins> ";

#ifdef XFRACT
	if (fullmenu && (g_got_real_dac || fake_lut) && colors >= 16)
#else
	if (fullmenu && g_got_real_dac && colors >= 16)
#endif
	{
		nextright += 2;
		choices[nextright] = "       COLORS                 ";
		attributes[nextright] = 256+MENU_HDG;

		nextright += 2;
		choicekey[nextright] = 'c';
		attributes[nextright] = MENU_ITEM;
		choices[nextright] = "color cycling mode       <c>  ";

		nextright += 2;
		choicekey[nextright] = '+';
		attributes[nextright] = MENU_ITEM;
		choices[nextright] = "rotate palette      <+>, <->  ";

		if (colors > 16)
		{
			if (!g_really_ega)
			{
				nextright += 2;
				choicekey[nextright] = 'e';
				attributes[nextright] = MENU_ITEM;
				choices[nextright] = "palette editing mode     <e>  ";
			}

			nextright += 2;
			choicekey[nextright] = 'a';
			attributes[nextright] = MENU_ITEM;
			choices[nextright] = "make starfield           <a>  ";
		}
	}

	nextright += 2;
	choicekey[nextright] = FIK_CTL_A;
	attributes[nextright] = MENU_ITEM;
	choices[nextright] = "ant automaton          <ctl-a>";

	nextright += 2;
	choicekey[nextright] = FIK_CTL_S;
	attributes[nextright] = MENU_ITEM;
	choices[nextright] = "stereogram             <ctl-s>";

	i = driver_key_pressed() ? driver_get_key() : 0;
	if (menu_checkkey(i, 0) == 0)
	{
		helpmode = HELPMAIN;         /* switch help modes */
		nextleft += 2;
		if (nextleft < nextright)
		{
			nextleft = nextright + 1;
		}
		i = fullscreen_choice(CHOICE_MENU | CHOICE_CRUNCH,
			"MAIN MENU",
			NULL, NULL, nextleft, (char **) choices, attributes,
			2, nextleft/2, 29, 0, NULL, NULL, NULL, menu_checkkey);
		if (i == -1)     /* escape */
		{
			i = FIK_ESC;
		}
		else if (i < 0)
		{
			i = 0 - i;
		}
		else                      /* user selected a choice */
		{
			i = choicekey[i];
			if (-10 == i)
			{
				helpmode = HELPZOOM;
				help(0);
				i = 0;
			}
		}
	}
	if (i == FIK_ESC)             /* escape from menu exits Fractint */
	{
		helptitle();
		driver_set_attr(1, 0, C_GENERAL_MED, 24*80);
		for (i = 9; i <= 11; ++i)
		{
			driver_set_attr(i, 18, C_GENERAL_INPUT, 40);
		}
		putstringcenter(10, 18, 40, C_GENERAL_INPUT,
#ifdef XFRACT
			"Exit from Xfractint (y/n)? y"
#else
			"Exit from Fractint (y/n)? y"
#endif
			);
		driver_hide_text_cursor();
		while ((i = driver_get_key()) != 'y' && i != 'Y' && i != 13)
		{
			if (i == 'n' || i == 'N')
			{
				goto top;
			}
		}
		goodbye();
	}
	if (i == FIK_TAB)
	{
		tab_display();
		i = 0;
	}
	if (i == FIK_ENTER || i == FIK_ENTER_2)
	{
		i = 0;                 /* don't trigger new calc */
	}
	tabmode = oldtabmode;
	return i;
}

static int menu_checkkey(int curkey, int choice)
{ /* choice is dummy used by other routines called by fullscreen_choice() */
   int testkey;
   testkey = choice; /* for warning only */
   testkey = (curkey>='A' && curkey<='Z') ? curkey+('a'-'A') : curkey;
#ifdef XFRACT
   /* We use F2 for shift-@, annoyingly enough */
   if (testkey == FIK_F2) return(0-testkey);
#endif
   if (testkey == '2')
      testkey = '@';
   if (strchr("#@2txyzgvir3dj",testkey) || testkey == FIK_INSERT || testkey == FIK_CTL_B
     || testkey == FIK_ESC || testkey == FIK_DELETE || testkey == FIK_CTL_F) /*RB 6== ctrl-F for sound menu */
      return(0-testkey);
   if (menutype) {
      if (strchr("\\sobpkrh",testkey) || testkey == FIK_TAB
        || testkey == FIK_CTL_A || testkey == FIK_CTL_E || testkey == FIK_BACKSPACE
        || testkey == FIK_CTL_P
        || testkey == FIK_CTL_S || testkey == FIK_CTL_U) /* ctrl-A, E, H, P, S, U */
         return(0-testkey);
      if (testkey == ' ')
         if ((curfractalspecific->tojulia != NOFRACTAL
              && param[0] == 0.0 && param[1] == 0.0)
           || curfractalspecific->tomandel != NOFRACTAL)
         return(0-testkey);
      if (g_got_real_dac && colors >= 16) {
         if (strchr("c+-",testkey))
            return(0-testkey);
         if (colors > 16
           && (testkey == 'a' || (!g_really_ega && testkey == 'e')))
            return(0-testkey);
         }
      /* Alt-A and Alt-S */
      if (testkey == FIK_ALT_A || testkey == FIK_ALT_S )
         return(0-testkey);
      }
   if (check_vidmode_key(0,testkey) >= 0)
      return(0-testkey);
   return(0);
}

int input_field(
        int options,          /* &1 numeric, &2 integer, &4 double */
        int attr,             /* display attribute */
        char *fld,            /* the field itself */
        int len,              /* field length (declare as 1 larger for \0) */
        int row,              /* display row */
        int col,              /* display column */
        int (*checkkey)(int)  /* routine to check non data keys, or NULL */
        )
{
   char savefld[81];
   char buf[81];
   int insert, started, offset, curkey, display;
   int i, j;
   int ret,savelookatmouse;
   savelookatmouse = lookatmouse;
   lookatmouse = 0;
   ret = -1;
   strcpy(savefld,fld);
   insert = started = offset = 0;
   display = 1;
   while (1) {
      strcpy(buf,fld);
      i = (int) strlen(buf);
      while (i < len)
         buf[i++] = ' ';
      buf[len] = 0;
      if (display) {                                /* display current value */
         driver_put_string(row,col,attr,buf);
         display = 0;
         }
      curkey = driver_key_cursor(row+insert,col+offset);  /* get a keystroke */
      if (curkey == 1047) curkey = 47; /* numeric slash */
      switch (curkey) {
         case FIK_ENTER:
         case FIK_ENTER_2:
            ret = 0;
            goto inpfld_end;
         case FIK_ESC:
            goto inpfld_end;
         case FIK_RIGHT_ARROW:
            if (offset < len-1) ++offset;
            started = 1;
            break;
         case FIK_LEFT_ARROW:
            if (offset > 0) --offset;
            started = 1;
            break;
         case FIK_HOME:
            offset = 0;
            started = 1;
            break;
         case FIK_END:
            offset = (int) strlen(fld);
            started = 1;
            break;
         case FIK_BACKSPACE:
         case 127:                              /* backspace */
            if (offset > 0) {
               j = (int) strlen(fld);
               for (i = offset-1; i < j; ++i)
                  fld[i] = fld[i+1];
               --offset;
               }
            started = display = 1;
            break;
         case FIK_DELETE:                           /* delete */
            j = (int) strlen(fld);
            for (i = offset; i < j; ++i)
               fld[i] = fld[i+1];
            started = display = 1;
            break;
         case FIK_INSERT:                           /* insert */
            insert ^= 0x8000;
            started = 1;
            break;
         case FIK_F5:
            strcpy(fld,savefld);
            insert = started = offset = 0;
            display = 1;
            break;
         default:
            if (nonalpha(curkey)) {
               if (checkkey && (ret = (*checkkey)(curkey)) != 0)
                  goto inpfld_end;
               break;                                /* non alphanum char */
               }
            if (offset >= len) break;                /* at end of field */
            if (insert && started && strlen(fld) >= (size_t)len)
               break;                                /* insert & full */
            if ((options & INPUTFIELD_NUMERIC)
              && (curkey < '0' || curkey > '9')
              && curkey != '+' && curkey != '-') {
               if (options & INPUTFIELD_INTEGER)
                  break;
               /* allow scientific notation, and specials "e" and "p" */
               if ( ((curkey != 'e' && curkey != 'E') || offset >= 18)
                 && ((curkey != 'p' && curkey != 'P') || offset != 0 )
                 && curkey != '.')
                  break;
               }
            if (started == 0) /* first char is data, zap field */
               fld[0] = 0;
            if (insert) {
               j = (int) strlen(fld);
               while (j >= offset) {
                  fld[j+1] = fld[j];
                  --j;
                  }
               }
            if ((size_t)offset >= strlen(fld))
               fld[offset+1] = 0;
            fld[offset++] = (char)curkey;
            /* if "e" or "p" in first col make number e or pi */
            if ((options & (INPUTFIELD_NUMERIC | INPUTFIELD_INTEGER)) == INPUTFIELD_NUMERIC) { /* floating point */
               double tmpd;
               int specialv;
               char tmpfld[30];
               specialv = 0;
               if (*fld == 'e' || *fld == 'E') {
                  tmpd = exp(1.0);
                  specialv = 1;
                  }
               if (*fld == 'p' || *fld == 'P') {
                  tmpd = atan(1.0) * 4;
                  specialv = 1;
                  }
               if (specialv) {
                  if ((options & INPUTFIELD_DOUBLE) == 0)
                     roundfloatd(&tmpd);
                  sprintf(tmpfld,"%.15g",tmpd);
                  tmpfld[len-1] = 0; /* safety, field should be long enough */
                  strcpy(fld,tmpfld);
                  offset = 0;
                  }
               }
            started = display = 1;
         }
      }
inpfld_end:
   lookatmouse = savelookatmouse;
   return(ret);
}

int field_prompt(
        char *hdg,      /* heading, \n delimited lines */
        char *instr,    /* additional instructions or NULL */
        char *fld,          /* the field itself */
        int len,            /* field length (declare as 1 larger for \0) */
        int (*checkkey)(int)   /* routine to check non data keys, or NULL */
        )
{
   char *charptr;
   int boxwidth,titlelines,titlecol,titlerow;
   int promptcol;
   int i,j;
   char buf[81];
   helptitle();                           /* clear screen, display title */
   driver_set_attr(1,0,C_PROMPT_BKGRD,24*80);     /* init rest to background */
   charptr = hdg;                         /* count title lines, find widest */
   i = boxwidth = 0;
   titlelines = 1;
   while (*charptr) {
      if (*(charptr++) == '\n') {
         ++titlelines;
         i = -1;
         }
      if (++i > boxwidth)
         boxwidth = i;
      }
   if (len > boxwidth)
      boxwidth = len;
   i = titlelines + 4;                    /* total rows in box */
   titlerow = (25 - i) / 2;               /* top row of it all when centered */
   titlerow -= titlerow / 4;              /* higher is better if lots extra */
   titlecol = (80 - boxwidth) / 2;        /* center the box */
   titlecol -= (90 - boxwidth) / 20;
   promptcol = titlecol - (boxwidth-len)/2;
   j = titlecol;                          /* add margin at each side of box */
   if ((i = (82-boxwidth)/4) > 3)
      i = 3;
   j -= i;
   boxwidth += i * 2;
   for (i = -1; i < titlelines+3; ++i)    /* draw empty box */
      driver_set_attr(titlerow+i,j,C_PROMPT_LO,boxwidth);
   g_text_cbase = titlecol;                  /* set left margin for putstring */
   driver_put_string(titlerow,0,C_PROMPT_HI,hdg); /* display heading */
   g_text_cbase = 0;
   i = titlerow + titlelines + 4;
   if (instr) {                           /* display caller's instructions */
      charptr = instr;
      j = -1;
      while ((buf[++j] = *(charptr++)) != 0)
         if (buf[j] == '\n') {
            buf[j] = 0;
            putstringcenter(i++,0,80,C_PROMPT_BKGRD,buf);
            j = -1;
            }
      putstringcenter(i,0,80,C_PROMPT_BKGRD,buf);
      }
   else                                   /* default instructions */
      putstringcenter(i,0,80,C_PROMPT_BKGRD, "Press ENTER when finished (or ESCAPE to back out)");
   return input_field(0,C_PROMPT_INPUT,fld,len,
                      titlerow+titlelines+1,promptcol,checkkey);
}


/* thinking(1,message):
      if thinking message not yet on display, it is displayed;
      otherwise the wheel is updated
      returns 0 to keep going, -1 if keystroke pending
   thinking(0,NULL):
      call this when thinking phase is done
   */

int thinking(int options,char *msg)
{
   static int thinkstate = -1;
   char *wheel[] = {"-","\\","|","/"};
   static int thinkcol;
   static int count = 0;
   char buf[81];
   if (options == 0) {
      if (thinkstate >= 0) {
         thinkstate = -1;
         driver_unstack_screen();
         }
      return(0);
      }
   if (thinkstate < 0) {
      driver_stack_screen();
      thinkstate = 0;
      helptitle();
      strcpy(buf,"  ");
      strcat(buf,msg);
      strcat(buf,"    ");
      driver_put_string(4,10,C_GENERAL_HI,buf);
      thinkcol = g_text_col - 3;
      count = 0;
      }
   if ((count++)<100) {
       return 0;
   }
   count = 0;
   driver_put_string(4,thinkcol,C_GENERAL_HI,wheel[thinkstate]);
   driver_hide_text_cursor(); /* turn off cursor */
   thinkstate = (thinkstate + 1) & 3;
   return (driver_key_pressed());
}


/* savegraphics/restoregraphics: video.asm subroutines */

unsigned long swaptotlen;
unsigned long swapoffset;
BYTE *swapvidbuf;
int swaplength;

#define SWAPBLKLEN 4096 /* must be a power of 2 */
U16 memhandle = 0;

BYTE suffix[10000];

void discardgraphics() /* release expanded/extended memory if any in use */
{
#ifndef XFRACT
   MemoryRelease(memhandle);
   memhandle = 0;
#endif
}

/*VIDEOINFO *g_video_table;  /* temporarily loaded fractint.cfg info */
int g_video_table_len;                 /* number of entries in above           */

int showvidlength()
{
   int sz;
   sz = (sizeof(VIDEOINFO)+sizeof(int))*MAXVIDEOMODES;
   return(sz);
}

int g_cfg_line_nums[MAXVIDEOMODES] = { 0 };

/* load_fractint_config
 *
 * Reads fractint.cfg, loading videoinfo entries into g_video_table.
 * Sets the number of entries, sets g_video_table_len.
 * Past g_video_table, g_cfg_line_nums are stored for update_fractint_cfg.
 * If fractint.cfg is not found or invalid, issues a message
 * (first time the problem occurs only, and only if options is
 * zero) and uses the hard-coded table.
 */
void load_fractint_config(void)
{
	FILE *cfgfile;
	VIDEOINFO vident;
	int linenum;
	long xdots, ydots;
	int i, j, keynum, ax, bx, cx, dx, dotmode, colors;
	char *fields[11];
	int textsafe2;
	char tempstring[150];
	int truecolorbits;

	findpath("fractint.cfg",tempstring);
	if (tempstring[0] == 0                            /* can't find the file */
		|| (cfgfile = fopen(tempstring,"r")) == NULL)   /* can't open it */
	{
		goto bad_fractint_cfg;
	}

	linenum = 0;
	while (g_video_table_len < MAXVIDEOMODES
		&& fgets(tempstring, 120, cfgfile))
	{
		if (strchr(tempstring,'\n') == NULL)
		{
			/* finish reading the line */
			while (fgetc(cfgfile) != '\n' && !feof(cfgfile));
		}
		++linenum;
		if (tempstring[0] == ';')
		{
			continue;   /* comment line */
		}
		tempstring[120] = 0;
		tempstring[(int) strlen(tempstring)-1] = 0; /* zap trailing \n */
		i = j = -1;
		/* key, mode name, ax, bx, cx, dx, dotmode, x, y, colors, comments, driver */
		for (;;)
		{
			if (tempstring[++i] < ' ')
			{
				if (tempstring[i] == 0)
				{
					break;
				}
				tempstring[i] = ' '; /* convert tab (or whatever) to blank */
			}
			else if (tempstring[i] == ',' && ++j < 11)
			{
#if defined(_WIN32)
				_ASSERTE(j >= 0 && j < 11);
#endif
				fields[j] = &tempstring[i+1]; /* remember start of next field */
				tempstring[i] = 0;   /* make field a separate string */
			}
		}
		keynum = check_vidmode_keyname(tempstring);
		sscanf(fields[1],"%x",&ax);
		sscanf(fields[2],"%x",&bx);
		sscanf(fields[3],"%x",&cx);
		sscanf(fields[4],"%x",&dx);
		dotmode     = atoi(fields[5]);
		xdots       = atol(fields[6]);
		ydots       = atol(fields[7]);
		colors      = atoi(fields[8]);
		if (colors == 4 && strchr(strlwr(fields[8]),'g'))
		{
			colors = 256;
			truecolorbits = 4; /* 32 bits */
		}
		else if (colors == 16 && strchr(fields[8],'m'))
		{
			colors = 256;
			truecolorbits = 3; /* 24 bits */
		}
		else if (colors == 64 && strchr(fields[8],'k'))
		{
			colors = 256;
			truecolorbits = 2; /* 16 bits */
		}
		else if (colors == 32 && strchr(fields[8],'k'))
		{
			colors = 256;
			truecolorbits = 1; /* 15 bits */
		}
		else
		{
			truecolorbits = 0;
		}

		textsafe2   = dotmode / 100;
		dotmode    %= 100;
		if (j < 9 ||
				keynum < 0 ||
				dotmode < 0 || dotmode > 30 ||
				textsafe2 < 0 || textsafe2 > 4 ||
				xdots < MINPIXELS || xdots > MAXPIXELS ||
				ydots < MINPIXELS || ydots > MAXPIXELS ||
				(colors != 0 && colors != 2 && colors != 4 && colors != 16 &&
				colors != 256)
			)
		{
			goto bad_fractint_cfg;
		}
		g_cfg_line_nums[g_video_table_len] = linenum; /* for update_fractint_cfg */

		memset(&vident, 0, sizeof(vident));
		strncpy(&vident.name[0], fields[0], NUM_OF(vident.name));
		strncpy(&vident.comment[0], fields[9], NUM_OF(vident.comment));
		vident.name[25] = vident.comment[25] = 0;
		vident.keynum      = keynum;
		vident.videomodeax = ax;
		vident.videomodebx = bx;
		vident.videomodecx = cx;
		vident.videomodedx = dx;
		vident.dotmode     = truecolorbits * 1000 + textsafe2 * 100 + dotmode;
		vident.xdots       = (short)xdots;
		vident.ydots       = (short)ydots;
		vident.colors      = colors;

		/* if valid, add to supported modes */
		vident.driver = driver_find_by_name(fields[10]);
		if (vident.driver != NULL)
		{
			if (vident.driver->validate_mode(vident.driver, &vident))
			{
				/* look for a synonym mode and if found, overwite its key */
				int m;
				int synonym_found = FALSE;
				for (m = 0; m < g_video_table_len; m++)
				{
					VIDEOINFO *mode = &g_video_table[m];
					if ((mode->driver == vident.driver) && (mode->colors == vident.colors) &&
						(mode->xdots == vident.xdots) && (mode->ydots == vident.ydots) &&
						(mode->dotmode == vident.dotmode))
					{
						if (0 == mode->keynum)
						{
							mode->keynum = vident.keynum;
						}
						synonym_found = TRUE;
						break;
					}
				}
				/* no synonym found, append it to current list of video modes */
				if (FALSE == synonym_found)
				{
					add_video_mode(vident.driver, &vident);
				}
			}
		}
	}
	fclose(cfgfile);
	return;

bad_fractint_cfg:
	g_bad_config = -1; /* bad, no message issued yet */
}

void bad_fractint_cfg_msg()
{
	stopmsg(0,
		"File FRACTINT.CFG is missing or invalid.\n"
		"See Hardware Support and Video Modes in the full documentation for help.\n"
		"I will continue with only the built-in video modes available.");
	g_bad_config = 1; /* bad, message issued */
}

int check_vidmode_key(int option,int k)
{
   int i;
   /* returns g_video_table entry number if the passed keystroke is a  */
   /* function key currently assigned to a video mode, -1 otherwise */
   if (k == 1400)              /* special value from select_vid_mode  */
      return(MAXVIDEOMODES-1); /* for last entry with no key assigned */
   if (k != 0) {
      if (option == 0) { /* check resident video mode table */
         for (i = 0; i < MAXVIDEOMODES; ++i) {
            if (g_video_table[i].keynum == k)
               return(i);
            }
         }
      else { /* check full g_video_table */
         for (i = 0; i < g_video_table_len; ++i) {
            if (g_video_table[i].keynum == k)
               return(i);
            }
         }
   }
   return(-1);
}

int check_vidmode_keyname(char *kname)
{
   /* returns key number for the passed keyname, 0 if not a keyname */
   int i,keyset;
   keyset = 1058;
   if (*kname == 'S' || *kname == 's') {
      keyset = 1083;
      ++kname;
      }
   else if (*kname == 'C' || *kname == 'c') {
      keyset = 1093;
      ++kname;
      }
   else if (*kname == 'A' || *kname == 'a') {
      keyset = 1103;
      ++kname;
      }
   if (*kname != 'F' && *kname != 'f')
      return(0);
   if (*++kname < '1' || *kname > '9')
      return(0);
   i = *kname - '0';
   if (*++kname != 0 && *kname != ' ') {
      if (*kname != '0' || i != 1)
         return(0);
      i = 10;
      ++kname;
      }
   while (*kname)
      if (*(kname++) != ' ')
         return(0);
   if ((i += keyset) < 2)
      i = 0;
   return(i);
}

void vidmode_keyname(int k,char *buf)
{
   /* set buffer to name of passed key number */
   *buf = 0;
   if (k > 0) {
      if (k > 1103) {
         *(buf++) = 'A';
         k -= 1103;
         }
      else if (k > 1093) {
         *(buf++) = 'C';
         k -= 1093;
         }
      else if (k > 1083) {
         *(buf++) = 'S';
         k -= 1083;
         }
      else
         k -= 1058;
      sprintf(buf,"F%d",k);
      }
}