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  Everyone is granted permission to copy, modify and redistribute GNU
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/*$Id: gp.h,v 1.4 1999/12/25 06:02:31 masata-y Exp $ */
/* Interface to platform-specific routines */
/* Requires gsmemory.h, gstypes.h */

#ifndef gp_INCLUDED
#  define gp_INCLUDED

/*
 * This file defines the interface to ***ALL*** platform-specific routines,
 * with the exception of the thread/synchronization interface (gpsync.h).
 * The routines are implemented in a gp_*.c file specific to each platform.
 * We try very hard to keep this list short!
 */
/*
 * gp_getenv is declared in a separate file, because a few places need it
 * and don't want to include any of the other gs definitions.
 */
#include "gpgetenv.h"

/* ------ Initialization/termination ------ */

/*
 * This routine is called early in the initialization.
 * It should do as little as possible.  In particular, it should not
 * do things like open display connections: that is the responsibility
 * of the display device driver.
 */
void gp_init(P0());

/*
 * This routine is called just before the program exits (normally or
 * abnormally).  It too should do as little as possible.
 */
void gp_exit(P2(int exit_status, int code));

/*
 * Exit the program.  Normally this just calls the `exit' library procedure,
 * but it does something different on a few platforms.
 */
void gp_do_exit(P1(int exit_status));

/* ------ Miscellaneous ------ */

/*
 * Get the string corresponding to an OS error number.
 * If no string is available, return NULL.  The caller may assume
 * the string is allocated statically and permanently.
 */
const char *gp_strerror(P1(int));

/* ------ Date and time ------ */

/*
 * Read the current time (in seconds since an implementation-defined epoch)
 * into ptm[0], and fraction (in nanoseconds) into ptm[1].
 */
void gp_get_realtime(P1(long ptm[2]));

/*
 * Read the current user CPU time (in seconds) into ptm[0],
 * and fraction (in nanoseconds) into ptm[1].
 */
void gp_get_usertime(P1(long ptm[2]));

/* ------ Screen management ------ */

/*
 * The following routines are only relevant in a single-window environment
 * such as a PC; on platforms with window systems, the 'make current'
 * routines do nothing.
 */

#ifndef gx_device_DEFINED
#  define gx_device_DEFINED
typedef struct gx_device_s gx_device;

#endif

/* Initialize the console. */
void gp_init_console(P0());

/* Write a string to the console. */
void gp_console_puts(P2(const char *, uint));

/* Make the console current on the screen. */
int gp_make_console_current(P1(gx_device *));

/* Make the graphics current on the screen. */
int gp_make_graphics_current(P1(gx_device *));

/*
 * The following are only relevant for X Windows.
 */

/* Get the environment variable that specifies the display to use. */
const char *gp_getenv_display(P0());

/* ------ File naming and accessing ------ */

/*
 * Define the maximum size of a file name returned by gp_open_scratch_file
 * or gp_open_printer.  (This should really be passed as an additional
 * parameter, but it would break too many clients to make this change now.)
 * Note that this is the size of the buffer, not the maximum number of
 * characters: the latter is one less, because of the terminating \0.
 */
#define gp_file_name_sizeof 128

/* Define the character used for separating file names in a list. */
extern const char gp_file_name_list_separator;

/* Define the default scratch file name prefix. */
extern const char gp_scratch_file_name_prefix[];

/* Define the name of the null output file. */
extern const char gp_null_file_name[];

/* Define the name that designates the current directory. */
extern const char gp_current_directory_name[];

/* Define the string to be concatenated with the file mode */
/* for opening files without end-of-line conversion. */
/* This is always either "" or "b". */
extern const char gp_fmode_binary_suffix[];

/* Define the file modes for binary reading or writing. */
/* (This is just a convenience: they are "r" or "w" + the suffix.) */
extern const char gp_fmode_rb[];
extern const char gp_fmode_wb[];

/* Create and open a scratch file with a given name prefix. */
/* Write the actual file name at fname. */
FILE *gp_open_scratch_file(P3(const char *prefix,
			      char fname[gp_file_name_sizeof],
			      const char *mode));

/* Open a file with the given name, as a stream of uninterpreted bytes. */
FILE *gp_fopen(P2(const char *fname, const char *mode));

/* Force given file into binary mode (no eol translations, etc) */
/* if 2nd param true, text mode if 2nd param false */
bool gp_setmode_binary(P2(FILE * pfile, bool mode));

/* Answer whether a file name contains a directory/device specification, */
/* i.e. is absolute (not directory- or device-relative). */
bool gp_file_name_is_absolute(P2(const char *fname, uint len));

/* Answer the string to be used for combining a directory/device prefix */
/* with a base file name.  The file name is known to not be absolute. */
const char *gp_file_name_concat_string(P4(const char *prefix, uint plen,
					  const char *fname, uint len));

/* ------ File enumeration ------ */

#ifndef file_enum_DEFINED	/* also defined in iodev.h */
#  define file_enum_DEFINED
struct file_enum_s;		/* opaque to client, defined by implementor */
typedef struct file_enum_s file_enum;

#endif

/*
 * Begin an enumeration.  pat is a C string that may contain *s or ?s.
 * The implementor should copy the string to a safe place.
 * If the operating system doesn't support correct, arbitrarily placed
 * *s and ?s, the implementation should modify the string so that it
 * will return a conservative superset of the request, and then use
 * the string_match procedure to select the desired subset.  E.g., if the
 * OS doesn't implement ? (single-character wild card), any consecutive
 * string of ?s should be interpreted as *.  Note that \ can appear in
 * the pattern also, as a quoting character.
 */
file_enum *gp_enumerate_files_init(P3(const char *pat, uint patlen,
				      gs_memory_t * memory));

/*
 * Return the next file name in the enumeration.  The client passes in
 * a scratch string and a max length.  If the name of the next file fits,
 * the procedure returns the length.  If it doesn't fit, the procedure
 * returns max length +1.  If there are no more files, the procedure
 * returns -1.
 */
uint gp_enumerate_files_next(P3(file_enum * pfen, char *ptr, uint maxlen));

/*
 * Clean up a file enumeration.  This is only called to abandon
 * an enumeration partway through: ...next should do it if there are
 * no more files to enumerate.  This should deallocate the file_enum
 * structure and any subsidiary structures, strings, buffers, etc.
 */
void gp_enumerate_files_close(P1(file_enum * pfen));

#endif /* gp_INCLUDED */
