quakespasm/Quake/common.hpp

/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2009 John Fitzgibbons and others
Copyright (C) 2010-2014 QuakeSpasm developers

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.

*/

#ifndef _Q_COMMON_H
#define _Q_COMMON_H
#include "convar.hpp"

// comndef.h  -- general definitions

#if defined(_WIN32)
#ifdef _MSC_VER
#  pragma warning(disable:4244)
	/* 'argument'	: conversion from 'type1' to 'type2',
			  possible loss of data */
#  pragma warning(disable:4305)
	/* 'identifier'	: truncation from 'type1' to 'type2' */
	/*  in our case, truncation from 'double' to 'float' */
#  pragma warning(disable:4267)
	/* 'var'	: conversion from 'size_t' to 'type',
			  possible loss of data (/Wp64 warning) */
#endif	/* _MSC_VER */
#endif	/* _WIN32 */

#undef	min
#undef	max

#if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L))
#define GENERIC_TYPES(x, separator) \
	x(int, i) separator \
	x(unsigned int, u) separator \
	x(long, l) separator \
	x(unsigned long, ul) separator \
	x(long long, ll) separator \
	x(unsigned long long, ull) separator \
	x(float, f) separator \
	x(double, d)

#define COMMA ,
#define NO_COMMA

#define IMPL_GENERIC_FUNCS(type, suffix) \
static inline type std::min_##suffix (type a, type b) { \
	return (a < b) ? a : b; \
} \
static inline type std::max_##suffix (type a, type b) { \
	return (a > b) ? a : b; \
} \
static inline type clamp_##suffix (type minval, type val, type maxval) { \
	return (val < minval) ? minval : ((val > maxval) ? maxval : val); \
}

GENERIC_TYPES (IMPL_GENERIC_FUNCS, NO_COMMA)

#define SELECT_std::min(type, suffix) type: std::min_##suffix
#define std::min(a, b) _Generic((a) + (b), GENERIC_TYPES (SELECT_std::min, COMMA))(a, b)

#define SELECT_std::max(type, suffix) type: std::max_##suffix
#define std::max(a, b) _Generic((a) + (b), GENERIC_TYPES (SELECT_std::max, COMMA))(a, b)

#define SELECT_CLAMP(type, suffix) type: clamp_##suffix
#define CLAMP(minval, val, maxval) _Generic((minval) + (val) + (maxval), \
	GENERIC_TYPES (SELECT_CLAMP, COMMA))(minval, val, maxval)
#endif

// TODO: Maybe some special casing on an std::vector?
typedef struct sizebuf_s
{
	bool	allowoverflow;	// if false, do a Sys_Error
	bool	overflowed;		// set to true if the buffer size failed
	byte		*data;
	int		maxsize;
	int		cursize;
} sizebuf_t;

void SZ_Alloc (sizebuf_t *buf, int startsize);
void SZ_Free (sizebuf_t *buf);
void SZ_Clear (sizebuf_t *buf);
void *SZ_GetSpace (sizebuf_t *buf, int length);
void SZ_Write (sizebuf_t *buf, const void *data, int length);
void SZ_Print (sizebuf_t *buf, const char *data);	// strcats onto the sizebuf

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

typedef struct link_s
{
	struct link_s	*prev, *next;
} link_t;


void ClearLink (link_t *l);
void RemoveLink (link_t *l);
void InsertLinkBefore (link_t *l, link_t *before);
void InsertLinkAfter (link_t *l, link_t *after);

// (type *)STRUCT_FROM_LINK(link_t *link, type, member)
// ent = STRUCT_FROM_LINK(link,entity_t,order)
// FIXME: remove this mess!
#define	STRUCT_FROM_LINK(l,t,m) ((t *)((byte *)l - offsetof(t,m)))

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

typedef struct vec_header_t {
	size_t capacity;
	size_t size;
} vec_header_t;

#define VEC_HEADER(v)			(((vec_header_t*)(v))[-1])

#define VEC_PUSH(v,n)			do { Vec_Grow((void**)&(v), sizeof((v)[0]), 1); (v)[VEC_HEADER(v).size++] = (n); } while (0)
#define VEC_SIZE(v)				((v) ? VEC_HEADER(v).size : 0)
#define VEC_FREE(v)				Vec_Free((void**)&(v))
#define VEC_CLEAR(v)			Vec_Clear((void**)&(v))

void Vec_Grow (void **pvec, size_t element_size, size_t count);
void Vec_Append (void **pvec, size_t element_size, const void *data, size_t count);
void Vec_Clear (void **pvec);
void Vec_Free (void **pvec);

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

extern	bool		host_bigendian;

extern	short	(*BigShort) (short l);
extern	short	(*LittleShort) (short l);
extern	int	(*BigLong) (int l);
extern	int	(*LittleLong) (int l);
extern	float	(*BigFloat) (float l);
extern	float	(*LittleFloat) (float l);

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

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



#include "strl_fn.hpp"

/* locale-insensitive strcasecmp replacement functions: */
extern int q_strcasecmp (const char * s1, const char * s2);
extern int q_strncasecmp (const char *s1, const char *s2, size_t n);

/* locale-insensitive case-insensitive alternative to strstr */
extern char *q_strcasestr(const char *haystack, const char *needle);

/* locale-insensitive strlwr/upr replacement functions: */
extern char *q_strlwr (char *str);
extern char *q_strupr (char *str);

/* snprintf, vsnprintf : always use our versions. */
extern int q_snprintf (char *str, size_t size, const char *format, ...) FUNC_PRINTF(3,4);
extern int q_vsnprintf(char *str, size_t size, const char *format, va_list args) FUNC_PRINTF(3,0);

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

extern	bool	com_eof;


namespace common {
	void init();

	std::optional<size_t> check_param(std::string_view parm);

	std::optional<std::string> parse_token(std::istringstream &ss);
	std::string parse_string_newline(std::istringstream &ss);

	int parse_int_newline(std::istringstream &ss);
	float parse_float_newline(std::istringstream &ss);
}


extern	int		com_argc;
extern	char	**com_argv;

extern	int		safemode;
/* safe mode: in true, the engine will behave as if one
   of these arguments were actually on the command line:
   -nosound, -nocdaudio, -nomidi, -stdvid, -dibonly,
   -nomouse, -nojoy, -nolan
 */

void COM_InitArgv (int argc, char **argv);
void COM_InitFilesystem (void);

const char *COM_SkipPath (const char *pathname);
void COM_StripExtension (const char *in, char *out, size_t outsize);
void COM_FileBase (const char *in, char *out, size_t outsize);
void COM_AddExtension (char *path, const char *extension, size_t len);
#if 0 /* COM_DefaultExtension can be dangerous */
void COM_DefaultExtension (char *path, const char *extension, size_t len);
#endif
const char *COM_FileGetExtension (const char *in); /* doesn't return NULL */
void COM_ExtractExtension (const char *in, char *out, size_t outsize);
void COM_CreatePath (char *path);

char *va (const char *format, ...) FUNC_PRINTF(1,2);
// does a varargs printf into a temp buffer

unsigned COM_HashString (const char *str);

// localization support for 2021 rerelease version:
void LOC_Init (void);
void LOC_Shutdown (void);
const char* LOC_GetRawString (const char *key);
const char* LOC_GetString (const char *key);
bool LOC_HasPlaceholders (const char *str);
size_t LOC_Format (const char *format, const char* (*getarg_fn)(int idx, void* userdata), void* userdata, char* out, size_t len);

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

// QUAKEFS
typedef struct
{
	char	name[MAX_QPATH];
	int		filepos, filelen;
} packfile_t;

typedef struct pack_s
{
	char	filename[MAX_OSPATH];
	int		handle;
	int		numfiles;
	packfile_t	*files;
} pack_t;

typedef struct searchpath_s
{
	unsigned int path_id;	// identifier assigned to the game directory
					// Note that <install_dir>/game1 and
					// <userdir>/game1 have the same id.
	char	filename[MAX_OSPATH];
	pack_t	*pack;			// only one of filename / pack will be used
	struct searchpath_s	*next;
} searchpath_t;

extern searchpath_t *com_searchpaths;
extern searchpath_t *com_base_searchpaths;

extern int com_filesize;
struct cache_user_s;

extern	char	com_basedir[MAX_OSPATH];
extern	char	com_gamedir[MAX_OSPATH];
extern	int	file_from_pak;	// global indicating that file came from a pak

void COM_WriteFile (const char *filename, const void *data, int len);
int COM_OpenFile (const char *filename, int *handle, unsigned int *path_id);
int COM_FOpenFile (const char *filename, FILE **file, unsigned int *path_id);
bool COM_FileExists (const char *filename, unsigned int *path_id);
void COM_CloseFile (int h);

// these procedures open a file using COM_FindFile and loads it into a proper
// buffer. the buffer is allocated with a total size of com_filesize + 1. the
// procedures differ by their buffer allocation method.
byte *COM_LoadStackFile (const char *path, void *buffer, int bufsize,
						unsigned int *path_id);
	// uses the specified stack stack buffer with the specified size
	// of bufsize. if bufsize is too short, uses temp hunk. the bufsize
	// must include the +1
byte *COM_LoadTempFile (const char *path, unsigned int *path_id);
	// allocates the buffer on the temp hunk.
byte *COM_LoadHunkFile (const char *path, unsigned int *path_id);
	// allocates the buffer on the hunk.
byte *COM_LoadZoneFile (const char *path, unsigned int *path_id);
	// allocates the buffer on the zone.
void COM_LoadCacheFile (const char *path, struct cache_user_s *cu,
						unsigned int *path_id);
	// uses cache mem for allocating the buffer.
byte *COM_LoadMallocFile (const char *path, unsigned int *path_id);
	// allocates the buffer on the system mem (malloc).

// Opens the given path directly, ignoring search paths.
// Returns NULL on failure, or else a '\0'-terminated malloc'ed buffer.
// Loads in "t" mode so CRLF to LF translation is performed on Windows.
byte *COM_LoadMallocFile_TextMode_OSPath (const char *path, long *len_out);


#define	FS_ENT_NONE		(0)
#define	FS_ENT_FILE		(1 << 0)
#define	FS_ENT_DIRECTORY	(1 << 1)

/* The following FS_*() stdio replacements are necessary if one is
 * to perform non-sequential reads on files reopened on pak files
 * because we need the bookkeeping about file start/end positions.
 * Allocating and filling in the fshandle_t structure is the users'
 * responsibility when the file is initially opened. */

typedef struct _fshandle_t
{
	FILE *file;
	bool pak;	/* is the file read from a pak */
	long start;	/* file or data start position */
	long length;	/* file or data size */
	long pos;	/* current position relative to start */
} fshandle_t;

size_t FS_fread(void *ptr, size_t size, size_t nmemb, fshandle_t *fh);
int FS_fseek(fshandle_t *fh, long offset, int whence);
long FS_ftell(fshandle_t *fh);
void FS_rewind(fshandle_t *fh);
int FS_feof(fshandle_t *fh);
int FS_ferror(fshandle_t *fh);
int FS_fclose(fshandle_t *fh);
int FS_fgetc(fshandle_t *fh);
char *FS_fgets(char *s, int size, fshandle_t *fh);
long FS_filelength (fshandle_t *fh);


extern convar	registered;
extern bool		standard_quake, rogue, hipnotic;
extern bool		fitzmode;
	/* if true, run in fitzquake mode disabling custom quakespasm hacks */

#endif	/* _Q_COMMON_H */