// cmdlib.c


#include "cmdlib.h"

#ifndef __NeXT__

#define PATHSEPERATOR   '\\'
#endif

#ifdef __NeXT__

#define O_BINARY        0
#define PATHSEPERATOR   '/'


/*
================
=
= filelength
=
================
*/
int filelength (int handle)
{
	struct stat	fileinfo;
    
	if (fstat (handle,&fileinfo) == -1)
	{
		fprintf (stderr,"Error fstating");
		exit (1);
	}
	return fileinfo.st_size;
}
int tell (int handle)
{
	return lseek (handle, 0, L_INCR);
}
char *strupr (char *start)
{
	char	*in;
	in = start;
	while (*in)
	{
		*in = toupper(*in);
		in++;
	}
	return start;
}
char *getcwd (char *path, int length)
{
	return getwd(path);
}
#endif


/* globals for command line args */
#ifdef __NeXT__
extern int NXArgc;
extern char **NXArgv;
#define myargc	NXArgc
#define myargv	NXArgv
#endif

#ifdef __WATCOMC__
extern int _argc;
extern char **_argv;
#define myargc	_argc
#define myargv	_argv
#endif


/*
=============================================================================

						MISC FUNCTIONS

=============================================================================
*/

/*
=================
=
= Error
=
= For abnormal program terminations
=
=================
*/

void Error (char *error, ...)
{
	va_list argptr;

#ifndef __NeXT__
	if ( *(byte *)0x449 == 0x13)
		TextMode ();
#endif

	va_start (argptr,error);
	vprintf (error,argptr);
	va_end (argptr);
	printf ("\n");
	exit (1);
}


/*
=================
=
= CheckParm
=
= Checks for the given parameter in the program's command line arguments
=
= Returns the argument number (1 to argc-1) or 0 if not present
=
=================
*/

int CheckParm (char *check)
{
	int             i;
	char    *parm;

	for (i = 1;i<myargc;i++)
	{
		parm = myargv[i];

		if ( !isalpha(*parm) )  // skip - / \ etc.. in front of parm
			if (!*++parm)
				continue;               // parm was only one char

		if ( !stricmp(check,parm) )
			return i;
	}

	return 0;
}




int SafeOpenWrite (char *filename)
{
	int     handle;

	handle = open(filename,O_RDWR | O_BINARY | O_CREAT | O_TRUNC
	, 0666);

	if (handle == -1)
		Error ("Error opening %s: %s",filename,strerror(errno));

	return handle;
}

int SafeOpenRead (char *filename)
{
	int     handle;

	handle = open(filename,O_RDONLY | O_BINARY);

	if (handle == -1)
		Error ("Error opening %s: %s",filename,strerror(errno));

	return handle;
}


void SafeRead (int handle, void *buffer, long count)
{
	unsigned        iocount;

	while (count)
	{
		iocount = count > 0x8000 ? 0x8000 : count;
		if (read (handle,buffer,iocount) != iocount)
			Error ("File read failure");
		buffer = (void *)( (byte *)buffer + iocount );
		count -= iocount;
	}
}


void SafeWrite (int handle, void *buffer, long count)
{
	unsigned        iocount;

	while (count)
	{
		iocount = count > 0x8000 ? 0x8000 : count;
		if (write (handle,buffer,iocount) != iocount)
			Error ("File write failure");
		buffer = (void *)( (byte *)buffer + iocount );
		count -= iocount;
	}
}


void *SafeMalloc (long size)
{
	void *ptr;

	ptr = malloc (size);

	if (!ptr)
		Error ("Malloc failure for %lu bytes",size);

	return ptr;
}


/*
==============
=
= LoadFile
=
==============
*/

long    LoadFile (char *filename, void **bufferptr)
{
	int             handle;
	long    length;
	void    *buffer;

	handle = SafeOpenRead (filename);
	length = filelength (handle);
	buffer = SafeMalloc (length);
	SafeRead (handle, buffer, length);
	close (handle);

	*bufferptr = buffer;
	return length;
}


/*
==============
=
= SaveFile
=
==============
*/

void    SaveFile (char *filename, void *buffer, long count)
{
	int             handle;

	handle = SafeOpenWrite (filename);
	SafeWrite (handle, buffer, count);
	close (handle);
}



void DefaultExtension (char *path, char *extension)
{
	char    *src;
//
// if path doesn't have a .EXT, append extension
// (extension should include the .)
//
	src = path + strlen(path) - 1;

	while (*src != PATHSEPERATOR && src != path)
	{
		if (*src == '.')
			return;                 // it has an extension
		src--;
	}

	strcat (path, extension);
}


void DefaultPath (char *path, char *basepath)
{
	char    temp[128];

	if (path[0] == PATHSEPERATOR)
		return;                                                 // absolute path location
	strcpy (temp,path);
	strcpy (path,basepath);
	strcat (path,temp);
}


void    StripFilename (char *path)
{
	int             length;

	length = strlen(path)-1;
	while (length > 0 && path[length] != PATHSEPERATOR)
		length--;
	path[length] = 0;
}

void    StripExtension (char *path)
{
	int             length;

	length = strlen(path)-1;
	while (length > 0 && path[length] != '.')
		length--;
	if (length)
		path[length] = 0;
}


void ExtractFileBase (char *path, char *dest)
{
	char    *src;
	int             length;

	src = path + strlen(path) - 1;

//
// back up until a \ or the start
//
	while (src != path && *(src-1) != PATHSEPERATOR)
		src--;

//
// copy up to eight characters
//
	memset (dest,0,8);
	length = 0;
	while (*src && *src != '.')
	{
		if (++length == 9)
			Error ("Filename base of %s >8 chars",path);
		*dest++ = toupper(*src++);
	}
}


/*
==============
=
= ParseNum / ParseHex
=
==============
*/

long ParseHex (char *hex)
{
	char    *str;
	long    num;

	num = 0;
	str = hex;

	while (*str)
	{
		num <<= 4;
		if (*str >= '0' && *str <= '9')
			num += *str-'0';
		else if (*str >= 'a' && *str <= 'f')
			num += 10 + *str-'a';
		else if (*str >= 'A' && *str <= 'F')
			num += 10 + *str-'A';
		else
			Error ("Bad hex number: %s",hex);
		str++;
	}

	return num;
}


long ParseNum (char *str)
{
	if (str[0] == '$')
		return ParseHex (str+1);
	if (str[0] == '0' && str[1] == 'x')
		return ParseHex (str+2);
	return atol (str);
}


int GetKey (void)
{
#ifdef __NeXT__
	return getchar ();
#else
	return _bios_keybrd (_KEYBRD_READ)&0xff;
#endif
}

/*
============================================================================

					BYTE ORDER FUNCTIONS

============================================================================
*/

#ifdef __BIG_ENDIAN__
short   LittleShort (short l)
{
	byte    b1,b2;

	b1 = l&255;
	b2 = (l>>8)&255;

	return (b1<<8) + b2;
}

short   BigShort (short l)
{
	return l;
}


long    LittleLong (long l)
{
	byte    b1,b2,b3,b4;

	b1 = l&255;
	b2 = (l>>8)&255;
	b3 = (l>>16)&255;
	b4 = (l>>24)&255;

	return ((long)b1<<24) + ((long)b2<<16) + ((long)b3<<8) + b4;
}

long    BigLong (long l)
{
	return l;
}


#else

short   BigShort (short l)
{
	byte    b1,b2;

	b1 = l&255;
	b2 = (l>>8)&255;

	return (b1<<8) + b2;
}

short   LittleShort (short l)
{
	return l;
}


long    BigLong (long l)
{
	byte    b1,b2,b3,b4;

	b1 = l&255;
	b2 = (l>>8)&255;
	b3 = (l>>16)&255;
	b4 = (l>>24)&255;

	return ((long)b1<<24) + ((long)b2<<16) + ((long)b3<<8) + b4;
}

long    LittleLong (long l)
{
	return l;
}


#endif
/*
============================================================================

						BASIC GRAPHICS

============================================================================
*/

byte	*screen;
#define PEL_WRITE_ADR   0x3c8
#define PEL_READ_ADR    0x3c7
#define PEL_DATA                0x3c9
#define PEL_MASK                0x3c6

/*
==============
=
= GetPalette
=
= Return an 8 bit / color palette
=
==============
*/

void GetPalette (byte *pal)
{
#ifndef __NeXT__
	int     i;

	outp (PEL_READ_ADR,0);
	for (i=0 ; i<768 ; i++)
		pal[i] = inp (PEL_DATA)<<2;
#endif
}

/*
==============
=
= SetPalette
=
= Sets an 8 bit / color palette
=
==============
*/

void SetPalette (byte *pal)
{
#ifndef __NeXT__
	int     i;

	outp (PEL_WRITE_ADR,0);
	for (i=0 ; i<768 ; i++)
		outp (PEL_DATA, pal[i]>>2);
#endif
}


void VGAMode (void)
{
#ifndef __NeXT__
union REGS      regs;		// scratch for int calls
	regs.w.ax = 0x13;
	int386 (0x10,(const union REGS *)&regs,&regs);
	screen = (byte *)0xa0000;
#else
	screen = malloc (0x10000);
#endif

}

void TextMode (void)
{
#ifndef __NeXT__
union REGS      regs;		// scratch for int calls
	regs.w.ax = 0x3;
	int386 (0x10,(const union REGS *)&regs,&regs);
#endif
}