/*
===========================================================================
Copyright (C) 1997-2006 Id Software, Inc.

This file is part of Quake 2 Tools source code.

Quake 2 Tools source code 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; either version 2 of the License,
or (at your option) any later version.

Quake 2 Tools source code 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 Quake 2 Tools source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

// cmdlib.c

#include "cmdlib.h"

#define PATHSEPERATOR   '/'

char		com_token[1024];
qboolean	com_eof;

/*
================
I_FloatTime
================
*/
double I_FloatTime (void)
{
	time_t	t;

	time (&t);

	return t;
#if 0
// more precise, less portable
	struct timeval tp;
	struct timezone tzp;
	static int		secbase;

	gettimeofday(&tp, &tzp);

	if (!secbase)
	{
		secbase = tp.tv_sec;
		return tp.tv_usec/1000000.0;
	}

	return (tp.tv_sec - secbase) + tp.tv_usec/1000000.0;
#endif
}


/*
==============
COM_Parse

Parse a token out of a string
==============
*/
char *COM_Parse (char *data)
{
	int		c;
	int		len;

	len = 0;
	com_token[0] = 0;

	if (!data)
		return NULL;

// skip whitespace
skipwhite:
	while ( (c = *data) <= ' ')
	{
		if (c == 0)
		{
			com_eof = true;
			return NULL;			// end of file;
		}
		data++;
	}

// skip // comments
	if (c=='/' && data[1] == '/')
	{
		while (*data && *data != '\n')
			data++;
		goto skipwhite;
	}


// handle quoted strings specially
	if (c == '\"')
	{
		data++;
		do
		{
			c = *data++;
			if (c=='\"')
			{
				com_token[len] = 0;
				return data;
			}
			com_token[len] = c;
			len++;
		} while (1);
	}

// parse single characters
	if (c=='{' || c=='}'|| c==')'|| c=='(' || c=='\'' || c==':')
	{
		com_token[len] = c;
		len++;
		com_token[len] = 0;
		return data+1;
	}

// parse a regular word
	do
	{
		com_token[len] = c;
		data++;
		len++;
		c = *data;
	if (c=='{' || c=='}'|| c==')'|| c=='(' || c=='\'' || c==':')
			break;
	} while (c>32);

	com_token[len] = 0;
	return data;
}


int Q_strncasecmp (char *s1, char *s2, int n)
{
	int		c1, c2;

	while (1)
	{
		c1 = *s1++;
		c2 = *s2++;

		if (!n--)
			return 0;		// strings are equal until end point

		if (c1 != c2)
		{
			if (c1 >= 'a' && c1 <= 'z')
				c1 -= ('a' - 'A');
			if (c2 >= 'a' && c2 <= 'z')
				c2 -= ('a' - 'A');
			if (c1 != c2)
				return -1;		// strings not equal
		}
		if (!c1)
			return 0;		// strings are equal
	}

	return -1;
}

int Q_strcasecmp (char *s1, char *s2)
{
	return Q_strncasecmp (s1, s2, 99999);
}



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

						MISC FUNCTIONS

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


int		argc;
char	*argv[MAX_NUM_ARGVS];

/*
============
ParseCommandLine
============
*/
void ParseCommandLine (char *lpCmdLine)
{
	argc = 1;
	argv[0] = "programname";

	while (*lpCmdLine && (argc < MAX_NUM_ARGVS))
	{
		while (*lpCmdLine && ((*lpCmdLine <= 32) || (*lpCmdLine > 126)))
			lpCmdLine++;

		if (*lpCmdLine)
		{
			argv[argc] = lpCmdLine;
			argc++;

			while (*lpCmdLine && ((*lpCmdLine > 32) && (*lpCmdLine <= 126)))
				lpCmdLine++;

			if (*lpCmdLine)
			{
				*lpCmdLine = 0;
				lpCmdLine++;
			}

		}
	}
}



/*
=================
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;

	for (i = 1;i<argc;i++)
	{
		if ( !Q_strcasecmp(check, argv[i]) )
			return i;
	}

	return 0;
}



/*
================
Q_filelength
================
*/
int Q_filelength (FILE *f)
{
	int		pos;
	int		end;

	pos = ftell (f);
	fseek (f, 0, SEEK_END);
	end = ftell (f);
	fseek (f, pos, SEEK_SET);

	return end;
}


FILE *SafeOpenWrite (char *filename)
{
	FILE	*f;

	f = fopen(filename, "wb");

	if (!f)
		Error ("Error opening %s: %s",filename,strerror(errno));

	return f;
}

FILE *SafeOpenRead (char *filename)
{
	FILE	*f;

	f = fopen(filename, "rb");

	if (!f)
		Error ("Error opening %s: %s",filename,strerror(errno));

	return f;
}


void SafeRead (FILE *f, void *buffer, int count)
{
	if ( (int)fread (buffer, 1, count, f) != count)
		Error ("File read failure");
}


void SafeWrite (FILE *f, void *buffer, int count)
{
	if ( (int)fwrite (buffer, 1, count, f) != count)
		Error ("File read failure");
}



/*
==============
LoadFile
==============
*/
int    LoadFile (char *filename, void **bufferptr)
{
	FILE	*f;
	int    length;
	void    *buffer;
	extern void *qmalloc( size_t size );

	f = fopen (filename, "rb");
	if (!f)
	{
		*bufferptr = NULL;
		return -1;
	}
	length = Q_filelength (f);
	buffer = qmalloc (length+1);
	((char *)buffer)[length] = 0;
	SafeRead (f, buffer, length);
	fclose (f);

	*bufferptr = buffer;
	return length;
}


/*
==============
LoadFileNoCrash

returns -1 length if not present
==============
*/
int    LoadFileNoCrash (char *filename, void **bufferptr)
{
	FILE	*f;
	int    length;
	void    *buffer;

	f = fopen (filename, "rb");
	if (!f)
		return -1;
	length = Q_filelength (f);
	buffer = qmalloc (length+1);
	((char *)buffer)[length] = 0;
	SafeRead (f, buffer, length);
	fclose (f);

	*bufferptr = buffer;
	return length;
}


/*
==============
SaveFile
==============
*/
void    SaveFile (char *filename, void *buffer, int count)
{
	FILE	*f;

	f = SafeOpenWrite (filename);
	SafeWrite (f, buffer, count);
	fclose (f);
}



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 (path[length] == '/')
			return;		// no extension
	}
	if (length)
		path[length] = 0;
}


/*
====================
Extract file parts
====================
*/
void ExtractFilePath (char *path, char *dest)
{
	char    *src;

	src = path + strlen(path) - 1;

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

	memcpy (dest, path, src-path);
	dest[src-path] = 0;
}

void ExtractFileName (char *path, char *dest)
{
	char    *src;

	src = path + strlen(path) - 1;

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

	while (*src)
	{
		*dest++ = *src++;
	}
	*dest = 0;
}

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

	src = path + strlen(path) - 1;

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

	while (*src && *src != '.')
	{
		*dest++ = *src++;
	}
	*dest = 0;
}

void ExtractFileExtension (char *path, char *dest)
{
	char    *src;

	src = path + strlen(path) - 1;

//
// back up until a . or the start
//
	while (src != path && *(src-1) != '.')
		src--;
	if (src == path)
	{
		*dest = 0;	// no extension
		return;
	}

	strcpy (dest,src);
}


/*
==============
ParseNum / ParseHex
==============
*/
int ParseHex (char *hex)
{
	char    *str;
	int    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;
}


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



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

					BYTE ORDER FUNCTIONS

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

#ifdef _SGI_SOURCE
#define	__BIG_ENDIAN__
#endif

#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;
}


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

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

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

int    BigLong (int l)
{
	return l;
}


float	LittleFloat (float l)
{
	union {byte b[4]; float f;} in, out;

	in.f = l;
	out.b[0] = in.b[3];
	out.b[1] = in.b[2];
	out.b[2] = in.b[1];
	out.b[3] = in.b[0];

	return out.f;
}

float	BigFloat (float 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;
}


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

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

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

int    LittleLong (int l)
{
	return l;
}

float	BigFloat (float l)
{
	union {byte b[4]; float f;} in, out;

	in.f = l;
	out.b[0] = in.b[3];
	out.b[1] = in.b[2];
	out.b[2] = in.b[1];
	out.b[3] = in.b[0];

	return out.f;
}

float	LittleFloat (float l)
{
	return l;
}



#endif