/* vi:set ts=8 sts=4 sw=4 noet:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 */

/*
 * macros.h: macro definitions for often used code
 *
 * Macros should be ALL_CAPS.  An exception is for where a function is
 * replaced and an argument is not used more than once.
 */

/*
 * PBYTE(lp, c) - put byte 'c' at position 'lp'
 */
#define PBYTE(lp, c) (*(ml_get_buf(curbuf, (lp).lnum, TRUE) + (lp).col) = (c))

/*
 * Position comparisons
 */
#define LT_POS(a, b) (((a).lnum != (b).lnum) \
		   ? (a).lnum < (b).lnum \
		   : (a).col != (b).col \
		       ? (a).col < (b).col \
		       : (a).coladd < (b).coladd)
#define LT_POSP(a, b) (((a)->lnum != (b)->lnum) \
		   ? (a)->lnum < (b)->lnum \
		   : (a)->col != (b)->col \
		       ? (a)->col < (b)->col \
		       : (a)->coladd < (b)->coladd)
#define EQUAL_POS(a, b) (((a).lnum == (b).lnum) && ((a).col == (b).col) && ((a).coladd == (b).coladd))
#define CLEAR_POS(a) do {(a)->lnum = 0; (a)->col = 0; (a)->coladd = 0;} while (0)

#define LTOREQ_POS(a, b) (LT_POS(a, b) || EQUAL_POS(a, b))

/*
 * VIM_ISWHITE() is used for "^" and the like. It differs from isspace()
 * because it doesn't include <CR> and <LF> and the like.
 */
#define VIM_ISWHITE(x)	((x) == ' ' || (x) == '\t')

/*
 * LINEEMPTY() - return TRUE if the line is empty
 */
#define LINEEMPTY(p) (*ml_get(p) == NUL)

/*
 * BUFEMPTY() - return TRUE if the current buffer is empty
 */
#define BUFEMPTY() (curbuf->b_ml.ml_line_count == 1 && *ml_get((linenr_T)1) == NUL)

/*
 * toupper() and tolower() that use the current locale.
 * On some systems toupper()/tolower() only work on lower/uppercase
 * characters, first use islower() or isupper() then.
 * Careful: Only call TOUPPER_LOC() and TOLOWER_LOC() with a character in the
 * range 0 - 255.  toupper()/tolower() on some systems can't handle others.
 * Note: It is often better to use MB_TOLOWER() and MB_TOUPPER(), because many
 * toupper() and tolower() implementations only work for ASCII.
 */
#ifdef MSWIN
#  define TOUPPER_LOC(c)	toupper_tab[(c) & 255]
#  define TOLOWER_LOC(c)	tolower_tab[(c) & 255]
#else
# ifdef BROKEN_TOUPPER
#  define TOUPPER_LOC(c)	(islower(c) ? toupper(c) : (c))
#  define TOLOWER_LOC(c)	(isupper(c) ? tolower(c) : (c))
# else
#  define TOUPPER_LOC		toupper
#  define TOLOWER_LOC		tolower
# endif
#endif

/* toupper() and tolower() for ASCII only and ignore the current locale. */
#ifdef EBCDIC
# define TOUPPER_ASC(c)	(islower(c) ? toupper(c) : (c))
# define TOLOWER_ASC(c)	(isupper(c) ? tolower(c) : (c))
#else
# define TOUPPER_ASC(c)	(((c) < 'a' || (c) > 'z') ? (c) : (c) - ('a' - 'A'))
# define TOLOWER_ASC(c)	(((c) < 'A' || (c) > 'Z') ? (c) : (c) + ('a' - 'A'))
#endif

/*
 * MB_ISLOWER() and MB_ISUPPER() are to be used on multi-byte characters.  But
 * don't use them for negative values!
 */
#define MB_ISLOWER(c)	vim_islower(c)
#define MB_ISUPPER(c)	vim_isupper(c)
#define MB_TOLOWER(c)	vim_tolower(c)
#define MB_TOUPPER(c)	vim_toupper(c)

/* Use our own isdigit() replacement, because on MS-Windows isdigit() returns
 * non-zero for superscript 1.  Also avoids that isdigit() crashes for numbers
 * below 0 and above 255.  */
#define VIM_ISDIGIT(c) ((unsigned)(c) - '0' < 10)

/* Like isalpha() but reject non-ASCII characters.  Can't be used with a
 * special key (negative value). */
#ifdef EBCDIC
# define ASCII_ISALPHA(c) isalpha(c)
# define ASCII_ISALNUM(c) isalnum(c)
# define ASCII_ISLOWER(c) islower(c)
# define ASCII_ISUPPER(c) isupper(c)
#else
# define ASCII_ISLOWER(c) ((unsigned)(c) - 'a' < 26)
# define ASCII_ISUPPER(c) ((unsigned)(c) - 'A' < 26)
# define ASCII_ISALPHA(c) (ASCII_ISUPPER(c) || ASCII_ISLOWER(c))
# define ASCII_ISALNUM(c) (ASCII_ISALPHA(c) || VIM_ISDIGIT(c))
#endif

/* Returns empty string if it is NULL. */
#define EMPTY_IF_NULL(x) ((x) ? (x) : (char_u *)"")

#ifdef FEAT_LANGMAP
/*
 * Adjust chars in a language according to 'langmap' option.
 * NOTE that there is no noticeable overhead if 'langmap' is not set.
 * When set the overhead for characters < 256 is small.
 * Don't apply 'langmap' if the character comes from the Stuff buffer or from
 * a mapping and the langnoremap option was set.
 * The do-while is just to ignore a ';' after the macro.
 */
# define LANGMAP_ADJUST(c, condition) \
    do { \
	if (*p_langmap \
		&& (condition) \
		&& (p_lrm || (!p_lrm && KeyTyped)) \
		&& !KeyStuffed \
		&& (c) >= 0) \
	{ \
	    if ((c) < 256) \
		c = langmap_mapchar[c]; \
	    else \
		c = langmap_adjust_mb(c); \
	} \
    } while (0)
#else
# define LANGMAP_ADJUST(c, condition) /* nop */
#endif

/*
 * VIM_ISBREAK() is used very often if 'linebreak' is set, use a macro to make
 * it work fast.  Only works for single byte characters!
 */
#define VIM_ISBREAK(c) ((c) < 256 && breakat_flags[(char_u)(c)])

/*
 * On VMS file names are different and require a translation.
 * On the Mac open() has only two arguments.
 */
#ifdef VMS
# define mch_access(n, p)	access(vms_fixfilename(n), (p))
				/* see mch_open() comment */
# define mch_fopen(n, p)	fopen(vms_fixfilename(n), (p))
# define mch_fstat(n, p)	fstat(vms_fixfilename(n), (p))
	/* VMS does not have lstat() */
# define mch_stat(n, p)		stat(vms_fixfilename(n), (p))
# define mch_rmdir(n)		rmdir(vms_fixfilename(n))
#else
# ifndef MSWIN
#   define mch_access(n, p)	access((n), (p))
# endif
# define mch_fstat(n, p)	fstat((n), (p))
# ifdef MSWIN	// has its own mch_stat() function
#  define mch_stat(n, p)	vim_stat((n), (p))
# else
#  ifdef STAT_IGNORES_SLASH
#   define mch_stat(n, p)	vim_stat((n), (p))
#  else
#   define mch_stat(n, p)	stat((n), (p))
#  endif
# endif
#endif

#ifdef HAVE_LSTAT
# define mch_lstat(n, p)	lstat((n), (p))
#else
# define mch_lstat(n, p)	mch_stat((n), (p))
#endif

#ifdef VMS
/*
 * It is possible to force some record format with:
 * #  define mch_open(n, m, p) open(vms_fixfilename(n), (m), (p)), "rat=cr", "rfm=stmlf", "mrs=0")
 * but it is not recommended, because it can destroy indexes etc.
 */
# define mch_open(n, m, p)	open(vms_fixfilename(n), (m), (p))
#endif

/* mch_open_rw(): invoke mch_open() with third argument for user R/W. */
#if defined(UNIX) || defined(VMS)  /* open in rw------- mode */
# define mch_open_rw(n, f)	mch_open((n), (f), (mode_t)0600)
#else
# if defined(MSWIN)  // open read/write
#  define mch_open_rw(n, f)	mch_open((n), (f), S_IREAD | S_IWRITE)
# else
#  define mch_open_rw(n, f)	mch_open((n), (f), 0)
# endif
#endif

#ifdef STARTUPTIME
# define TIME_MSG(s) do { if (time_fd != NULL) time_msg(s, NULL); } while (0)
#else
# define TIME_MSG(s) do { /**/ } while (0)
#endif

#define REPLACE_NORMAL(s) (((s) & REPLACE_FLAG) && !((s) & VREPLACE_FLAG))

#ifdef FEAT_ARABIC
# define ARABIC_CHAR(ch)            (((ch) & 0xFF00) == 0x0600)
# define UTF_COMPOSINGLIKE(p1, p2)  utf_composinglike((p1), (p2))
#else
# define UTF_COMPOSINGLIKE(p1, p2)  utf_iscomposing(utf_ptr2char(p2))
#endif

#ifdef FEAT_RIGHTLEFT
    /* Whether to draw the vertical bar on the right side of the cell. */
# define CURSOR_BAR_RIGHT (curwin->w_p_rl && (!(State & CMDLINE) || cmdmsg_rl))
#endif

/*
 * MB_PTR_ADV(): advance a pointer to the next character, taking care of
 * multi-byte characters if needed.
 * MB_PTR_BACK(): backup a pointer to the previous character, taking care of
 * multi-byte characters if needed.
 * MB_COPY_CHAR(f, t): copy one char from "f" to "t" and advance the pointers.
 * PTR2CHAR(): get character from pointer.
 */
/* Get the length of the character p points to, including composing chars */
#define MB_PTR2LEN(p)	    (has_mbyte ? (*mb_ptr2len)(p) : 1)
/* Advance multi-byte pointer, skip over composing chars. */
#define MB_PTR_ADV(p)	    p += has_mbyte ? (*mb_ptr2len)(p) : 1
/* Advance multi-byte pointer, do not skip over composing chars. */
#define MB_CPTR_ADV(p)	    p += enc_utf8 ? utf_ptr2len(p) : has_mbyte ? (*mb_ptr2len)(p) : 1
/* Backup multi-byte pointer. Only use with "p" > "s" ! */
#define MB_PTR_BACK(s, p)  p -= has_mbyte ? ((*mb_head_off)(s, p - 1) + 1) : 1
/* get length of multi-byte char, not including composing chars */
#define MB_CPTR2LEN(p)	    (enc_utf8 ? utf_ptr2len(p) : (*mb_ptr2len)(p))

#define MB_COPY_CHAR(f, t) do { if (has_mbyte) mb_copy_char(&f, &t); else *t++ = *f++; } while (0)
#define MB_CHARLEN(p)	    (has_mbyte ? mb_charlen(p) : (int)STRLEN(p))
#define MB_CHAR2LEN(c)	    (has_mbyte ? mb_char2len(c) : 1)
#define PTR2CHAR(p)	    (has_mbyte ? mb_ptr2char(p) : (int)*(p))

#ifdef FEAT_AUTOCHDIR
# define DO_AUTOCHDIR do { if (p_acd) do_autochdir(); } while (0)
#else
# define DO_AUTOCHDIR do { /**/ } while (0)
#endif

#define RESET_BINDING(wp)  do { (wp)->w_p_scb = FALSE; (wp)->w_p_crb = FALSE; \
			    } while (0)

#ifdef FEAT_DIFF
# define PLINES_NOFILL(x) plines_nofill(x)
#else
# define PLINES_NOFILL(x) plines(x)
#endif

#if defined(FEAT_JOB_CHANNEL) || defined(FEAT_CLIENTSERVER)
# define MESSAGE_QUEUE
#endif

#if defined(FEAT_EVAL) && defined(FEAT_FLOAT)
# include <float.h>
# if defined(HAVE_MATH_H)
   /* for isnan() and isinf() */
#  include <math.h>
# endif
# ifdef USING_FLOAT_STUFF
#  ifdef MSWIN
#   ifndef isnan
#    define isnan(x) _isnan(x)
     static __inline int isinf(double x) { return !_finite(x) && !_isnan(x); }
#   endif
#  else
#   ifndef HAVE_ISNAN
     static inline int isnan(double x) { return x != x; }
#   endif
#   ifndef HAVE_ISINF
     static inline int isinf(double x) { return !isnan(x) && isnan(x - x); }
#   endif
#  endif
#  if !defined(INFINITY)
#   if defined(DBL_MAX)
#    ifdef VMS
#     define INFINITY DBL_MAX
#    else
#     define INFINITY (DBL_MAX+DBL_MAX)
#    endif
#   else
#    define INFINITY (1.0 / 0.0)
#   endif
#  endif
#  if !defined(NAN)
#   define NAN (INFINITY-INFINITY)
#  endif
#  if !defined(DBL_EPSILON)
#   define DBL_EPSILON 2.2204460492503131e-16
#  endif
# endif
#endif

/*
 * In a hashtab item "hi_key" points to "di_key" in a dictitem.
 * This avoids adding a pointer to the hashtab item.
 * DI2HIKEY() converts a dictitem pointer to a hashitem key pointer.
 * HIKEY2DI() converts a hashitem key pointer to a dictitem pointer.
 * HI2DI() converts a hashitem pointer to a dictitem pointer.
 */
#define DI2HIKEY(di) ((di)->di_key)
#define HIKEY2DI(p)  ((dictitem_T *)(p - offsetof(dictitem_T, di_key)))
#define HI2DI(hi)     HIKEY2DI((hi)->hi_key)

/*
 * Flush control functions.
 */
#ifdef FEAT_GUI
# define mch_enable_flush()	gui_enable_flush()
# define mch_disable_flush()	gui_disable_flush()
#else
# define mch_enable_flush()
# define mch_disable_flush()
#endif

/*
 * Like vim_free(), and also set the pointer to NULL.
 */
#define VIM_CLEAR(p) \
    do { \
	if ((p) != NULL) { \
	    vim_free(p); \
	    (p) = NULL; \
	} \
    } while (0)

/* Wether a command index indicates a user command. */
#define IS_USER_CMDIDX(idx) ((int)(idx) < 0)