/*  Copyright (C) 1996-1997  Id Software, Inc.

    This program 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.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

    See file, 'COPYING', for details.
*/

// cmdlib.c

#include "config.h"
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#include <sys/types.h>
#include <sys/stat.h>

#include "cmdlib.h"

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

#ifdef NeXT
#include <libc.h>
#endif

#define PATHSEPERATOR   '/'

// set these before calling CheckParm
int myargc;
char **myargv;

qboolean	com_eof;

qboolean		archive;
char			archivedir[1024];

/*
qdir will hold the path up to the quake directory, including the slash

  f:\quake\
  /raid/quake/

gamedir will hold qdir + the game directory (id1, id2, etc)
*/

char		qdir[1024];
char		gamedir[1024];

void
SetQdirFromPath (char *path)
{
	char	temp[1024];
	char	*c;

	if (!(path[0] == '/' || path[0] == '\\' || path[1] == ':'))
	{	// path is partial
		Q_getwd (temp);
		strcat (temp, path);
		path = temp;
	}

	// search for "quake" in path

	for (c=path ; *c ; c++)
		if (!Q_strncasecmp (c, "quake", 5)) {
			strncpy (qdir, path, c+6-path);
			printf ("qdir: %s\n", qdir);
			c += 6;
			while (*c) {
				if (*c == '/' || *c == '\\') {
					strncpy (gamedir, path, c+1-path);
					printf ("gamedir: %s\n", gamedir);
					return;
				}
				c++;
			}
			Error ("No gamedir in %s", path);
			return;
		}
	Error ("SetQdirFromPath: no 'quake' in %s", path);
}

const char *
ExpandPath (const char *path)
{
	static char full[1024];

	if (!qdir)
		Error ("ExpandPath called without qdir set");
	if (path[0] == '/' || path[0] == '\\' || path[1] == ':')
		return path;
	sprintf (full, "%s%s", qdir, path);
	return full;
}

const char *
ExpandPathAndArchive (const char *path)
{
	const char	*expanded;
	char	 archivename[1024];

	expanded = ExpandPath (path);

	if (archive) {
		sprintf (archivename, "%s/%s", archivedir, path);
		CopyFile (expanded, archivename);
	}
	return expanded;
}

char *
copystring(const char *s)
{
	char	*b;

	b = malloc (strlen (s) + 1);
	strcpy (b, s);
	return b;
}

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
}

void
Q_getwd (char *out)
{
#ifdef _WIN32
	_getcwd (out, 256);
	strcat (out, "\\");
#else
	getcwd (out, 256);
#endif
}

void
Q_mkdir (char *path)
{
#ifdef _WIN32
	if (_mkdir (path) != -1)
		return;
#else
	if (mkdir (path, 0777) != -1)
		return;
#endif
	if (errno != EEXIST)
		Error ("mkdir %s: %s",path, strerror(errno));
}

/*
============
FileTime

returns -1 if not present
============
*/
int
FileTime (char *path)
{
	struct stat		buf;

	if (stat (path,&buf) == -1)
		return -1;

	return buf.st_mtime;
}

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

char *
strupr (char *start)
{
	char	*in;

	in = start;
	while (*in) {
		*in = toupper (*in);
		in++;
	}
	return start;
}

char *
strlower (char *start)
{
	char	*in;

	in = start;
	while (*in) {
		*in = tolower (*in);
		in++;
	}
	return start;
}

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

						MISC FUNCTIONS

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

/*
=================
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 (const char *check)
{
	int		i;

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

	return 0;
}

QFile *
SafeOpenWrite (const char *filename)
{
	QFile	*f;

	f = Qopen(filename, "wb");

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

	return f;
}

QFile *
SafeOpenRead (const char *filename)
{
	QFile	*f;

	f = Qopen(filename, "rb");

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

	return f;
}

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

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

void
SaveFile (const char *filename, void *buffer, int count)
{
	QFile	*f;

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

void
DefaultExtension (char *path, const 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
ExtractFileBase (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--;

	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);
}

static 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

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

//=======================================================


// FIXME: byte swap?

// this is a 16 bit, non-reflected CRC using the polynomial 0x1021
// and the initial and final xor values shown below...  in other words, the
// CCITT standard CRC used by XMODEM

#define CRC_INIT_VALUE	0xffff
#define CRC_XOR_VALUE	0x0000

static unsigned short crctable[256] =
{
	0x0000,	0x1021,	0x2042,	0x3063,	0x4084,	0x50a5,	0x60c6,	0x70e7,
	0x8108,	0x9129,	0xa14a,	0xb16b,	0xc18c,	0xd1ad,	0xe1ce,	0xf1ef,
	0x1231,	0x0210,	0x3273,	0x2252,	0x52b5,	0x4294,	0x72f7,	0x62d6,
	0x9339,	0x8318,	0xb37b,	0xa35a,	0xd3bd,	0xc39c,	0xf3ff,	0xe3de,
	0x2462,	0x3443,	0x0420,	0x1401,	0x64e6,	0x74c7,	0x44a4,	0x5485,
	0xa56a,	0xb54b,	0x8528,	0x9509,	0xe5ee,	0xf5cf,	0xc5ac,	0xd58d,
	0x3653,	0x2672,	0x1611,	0x0630,	0x76d7,	0x66f6,	0x5695,	0x46b4,
	0xb75b,	0xa77a,	0x9719,	0x8738,	0xf7df,	0xe7fe,	0xd79d,	0xc7bc,
	0x48c4,	0x58e5,	0x6886,	0x78a7,	0x0840,	0x1861,	0x2802,	0x3823,
	0xc9cc,	0xd9ed,	0xe98e,	0xf9af,	0x8948,	0x9969,	0xa90a,	0xb92b,
	0x5af5,	0x4ad4,	0x7ab7,	0x6a96,	0x1a71,	0x0a50,	0x3a33,	0x2a12,
	0xdbfd,	0xcbdc,	0xfbbf,	0xeb9e,	0x9b79,	0x8b58,	0xbb3b,	0xab1a,
	0x6ca6,	0x7c87,	0x4ce4,	0x5cc5,	0x2c22,	0x3c03,	0x0c60,	0x1c41,
	0xedae,	0xfd8f,	0xcdec,	0xddcd,	0xad2a,	0xbd0b,	0x8d68,	0x9d49,
	0x7e97,	0x6eb6,	0x5ed5,	0x4ef4,	0x3e13,	0x2e32,	0x1e51,	0x0e70,
	0xff9f,	0xefbe,	0xdfdd,	0xcffc,	0xbf1b,	0xaf3a,	0x9f59,	0x8f78,
	0x9188,	0x81a9,	0xb1ca,	0xa1eb,	0xd10c,	0xc12d,	0xf14e,	0xe16f,
	0x1080,	0x00a1,	0x30c2,	0x20e3,	0x5004,	0x4025,	0x7046,	0x6067,
	0x83b9,	0x9398,	0xa3fb,	0xb3da,	0xc33d,	0xd31c,	0xe37f,	0xf35e,
	0x02b1,	0x1290,	0x22f3,	0x32d2,	0x4235,	0x5214,	0x6277,	0x7256,
	0xb5ea,	0xa5cb,	0x95a8,	0x8589,	0xf56e,	0xe54f,	0xd52c,	0xc50d,
	0x34e2,	0x24c3,	0x14a0,	0x0481,	0x7466,	0x6447,	0x5424,	0x4405,
	0xa7db,	0xb7fa,	0x8799,	0x97b8,	0xe75f,	0xf77e,	0xc71d,	0xd73c,
	0x26d3,	0x36f2,	0x0691,	0x16b0,	0x6657,	0x7676,	0x4615,	0x5634,
	0xd94c,	0xc96d,	0xf90e,	0xe92f,	0x99c8,	0x89e9,	0xb98a,	0xa9ab,
	0x5844,	0x4865,	0x7806,	0x6827,	0x18c0,	0x08e1,	0x3882,	0x28a3,
	0xcb7d,	0xdb5c,	0xeb3f,	0xfb1e,	0x8bf9,	0x9bd8,	0xabbb,	0xbb9a,
	0x4a75,	0x5a54,	0x6a37,	0x7a16,	0x0af1,	0x1ad0,	0x2ab3,	0x3a92,
	0xfd2e,	0xed0f,	0xdd6c,	0xcd4d,	0xbdaa,	0xad8b,	0x9de8,	0x8dc9,
	0x7c26,	0x6c07,	0x5c64,	0x4c45,	0x3ca2,	0x2c83,	0x1ce0,	0x0cc1,
	0xef1f,	0xff3e,	0xcf5d,	0xdf7c,	0xaf9b,	0xbfba,	0x8fd9,	0x9ff8,
	0x6e17,	0x7e36,	0x4e55,	0x5e74,	0x2e93,	0x3eb2,	0x0ed1,	0x1ef0
};

void
CRC_Init (unsigned short *crcvalue)
{
	*crcvalue = CRC_INIT_VALUE;
}

void
CRC_ProcessByte (unsigned short *crcvalue, byte data)
{
	*crcvalue = (*crcvalue << 8) ^ crctable[(*crcvalue >> 8) ^ data];
}

unsigned short
CRC_Value (unsigned short crcvalue)
{
	return crcvalue ^ CRC_XOR_VALUE;
}

//=============================================================================

void
CreatePath (const char *_path)
{
	char    *path = strdup (_path);
	char	*ofs, c;

	for (ofs = path+1 ; *ofs ; ofs++) {
		c = *ofs;
		if (c == '/' || c == '\\')
		{	// create the directory
			*ofs = 0;
			Q_mkdir (path);
			*ofs = c;
		}
	}
	free (path);
}

int
LoadFile (const char *fname, void **buf)
{
	QFile      *file;
	char       *src;
	int         len;

	*buf = 0;
	file = Qopen (fname, "rt");
	if (!file)
		return 0;
	len = Qfilesize (file);
	src = malloc (len + 1);
	src[Qfilesize (file)] = 0;
	Qread (file, src, len);
	Qclose (file);
	*buf = src;
	return len;
}

/*
============
CopyFile

  Used to archive source files
============
*/
void
CopyFile (const char *from, const char *to)
{
	void	*buffer;
	int		length;

	length = LoadFile (from, &buffer);
	CreatePath (to);
	SaveFile (to, buffer, length);
	free (buffer);
}

/*
=================
Error

For abnormal program terminations
=================
*/
void
Error (const char *error, ...)
{
	va_list argptr;

	printf ("************ ERROR ************\n");

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