diff --git a/src/vim.h b/src/vim.h
index 1875e3b..e9d586b 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -21,9 +21,9 @@
 # include "vimio.h"
 #endif
 
-/* ============ the header file puzzle (ca. 50-100 pieces) ========= */
+// ============ the header file puzzle: order matters =========
 
-#ifdef HAVE_CONFIG_H	/* GNU autoconf (or something else) was here */
+#ifdef HAVE_CONFIG_H	// GNU autoconf (or something else) was here
 # include "auto/config.h"
 # define HAVE_PATHDEF
 
@@ -47,22 +47,22 @@
 #  undef HAVE_FCHDIR
 # endif
 
-/* We may need to define the uint32_t on non-Unix system, but using the same
- * identifier causes conflicts.  Therefore use UINT32_T. */
+// We may need to define the uint32_t on non-Unix system, but using the same
+// identifier causes conflicts.  Therefore use UINT32_T.
 # define UINT32_TYPEDEF uint32_t
 #endif
 
 #if !defined(UINT32_TYPEDEF)
-# if defined(uint32_t)  /* this doesn't catch typedefs, unfortunately */
+# if defined(uint32_t)  // this doesn't catch typedefs, unfortunately
 #  define UINT32_TYPEDEF uint32_t
 # else
-  /* Fall back to assuming unsigned int is 32 bit.  If this is wrong then the
-   * test in blowfish.c will fail. */
+  // Fall back to assuming unsigned int is 32 bit.  If this is wrong then the
+  // test in blowfish.c will fail.
 #  define UINT32_TYPEDEF unsigned int
 # endif
 #endif
 
-/* user ID of root is usually zero, but not for everybody */
+// user ID of root is usually zero, but not for everybody
 #ifdef __TANDEM
 # ifndef _TANDEM_SOURCE
 #  define _TANDEM_SOURCE
@@ -84,7 +84,7 @@
 #if defined(MACOS_X_DARWIN) && !defined(MACOS_X)
 # define MACOS_X
 #endif
-/* Unless made through the Makefile enforce GUI on Mac */
+// Unless made through the Makefile enforce GUI on Mac
 #if defined(MACOS_X) && !defined(HAVE_CONFIG_H)
 # define UNIX
 # define FEAT_GUI_MAC
@@ -96,20 +96,20 @@
     || defined(FEAT_GUI_MAC) \
     || defined(FEAT_GUI_MSWIN) \
     || defined(FEAT_GUI_PHOTON)
-# define FEAT_GUI_ENABLED  /* also defined with NO_X11_INCLUDES */
+# define FEAT_GUI_ENABLED  // also defined with NO_X11_INCLUDES
 # if !defined(FEAT_GUI) && !defined(NO_X11_INCLUDES)
 #  define FEAT_GUI
 # endif
 #endif
 
-/* Check support for rendering options */
+// Check support for rendering options
 #ifdef FEAT_GUI
 # if defined(FEAT_DIRECTX)
 #  define FEAT_RENDER_OPTIONS
 # endif
 #endif
 
-/* Visual Studio 2005 has 'deprecated' many of the standard CRT functions */
+// Visual Studio 2005 has 'deprecated' many of the standard CRT functions
 #if _MSC_VER >= 1400
 # define _CRT_SECURE_NO_DEPRECATE
 # define _CRT_NONSTDC_NO_DEPRECATE
@@ -124,8 +124,8 @@
 #endif
 
 #ifdef AMIGA
-  /* Be conservative about sizeof(int). It could be 4 too. */
-# ifndef FEAT_GUI_GTK	/* avoid problems when generating prototypes */
+  // Be conservative about sizeof(int). It could be 4 too.
+# ifndef FEAT_GUI_GTK	// avoid problems when generating prototypes
 #  ifdef __GNUC__
 #   define VIM_SIZEOF_INT	4
 #  else
@@ -156,14 +156,14 @@
 # endif
 #endif
 
-/* +x11 is only enabled when it's both available and wanted. */
+// +x11 is only enabled when it's both available and wanted.
 #if defined(HAVE_X11) && defined(WANT_X11)
 # define FEAT_X11
 #endif
 
 #ifdef NO_X11_INCLUDES
-    /* In os_mac_conv.c and os_macosx.m NO_X11_INCLUDES is defined to avoid
-     * X11 headers.  Disable all X11 related things to avoid conflicts. */
+    // In os_mac_conv.c and os_macosx.m NO_X11_INCLUDES is defined to avoid
+    // X11 headers.  Disable all X11 related things to avoid conflicts.
 # ifdef FEAT_X11
 #  undef FEAT_X11
 # endif
@@ -193,12 +193,12 @@
 # endif
 #endif
 
-/* The Mac conversion stuff doesn't work under X11. */
+// The Mac conversion stuff doesn't work under X11.
 #if defined(MACOS_X_DARWIN)
 # define MACOS_CONVERT
 #endif
 
-/* Can't use "PACKAGE" here, conflicts with a Perl include file. */
+// Can't use "PACKAGE" here, conflicts with a Perl include file.
 #ifndef VIMPACKAGE
 # define VIMPACKAGE	"vim"
 #endif
@@ -224,32 +224,31 @@
 
 #if (defined(UNIX) || defined(VMS)) \
 	&& (!defined(MACOS_X) || defined(HAVE_CONFIG_H))
-# include "os_unix.h"	    /* bring lots of system header files */
+# include "os_unix.h"	    // bring lots of system header files
 #endif
 
-/* Mark unused function arguments with UNUSED, so that gcc -Wunused-parameter
- * can be used to check for mistakes. */
+// Mark unused function arguments with UNUSED, so that gcc -Wunused-parameter
+// can be used to check for mistakes.
 #ifdef HAVE_ATTRIBUTE_UNUSED
 # define UNUSED __attribute__((unused))
 #else
 # define UNUSED
 #endif
 
-/* Used to check for "sun", "__sun" is used by newer compilers. */
+// Used to check for "sun", "__sun" is used by newer compilers.
 #if defined(__sun)
 # define SUN_SYSTEM
 #endif
 
-/* If we're compiling in C++ (currently only KVim), the system
- * headers must have the correct prototypes or nothing will build.
- * Conversely, our prototypes might clash due to throw() specifiers and
- * cause compilation failures even though the headers are correct.  For
- * a concrete example, gcc-3.2 enforces exception specifications, and
- * glibc-2.2.5 has them in their system headers.
- */
+// If we're compiling in C++ (currently only KVim), the system
+// headers must have the correct prototypes or nothing will build.
+// Conversely, our prototypes might clash due to throw() specifiers and
+// cause compilation failures even though the headers are correct.  For
+// a concrete example, gcc-3.2 enforces exception specifications, and
+// glibc-2.2.5 has them in their system headers.
 #if !defined(__cplusplus) && defined(UNIX) \
-	&& !defined(MACOS_X) /* MACOS_X doesn't yet support osdef.h */
-# include "auto/osdef.h"	/* bring missing declarations in */
+	&& !defined(MACOS_X) // MACOS_X doesn't yet support osdef.h
+# include "auto/osdef.h"	// bring missing declarations in
 #endif
 
 #ifdef AMIGA
@@ -295,7 +294,7 @@
 # define PATH_ESC_CHARS ((char_u *)" \t\n*?[{`%#'\"|!<")
 #else
 # ifdef VMS
-    /* VMS allows a lot of characters in the file name */
+    // VMS allows a lot of characters in the file name
 #  define PATH_ESC_CHARS ((char_u *)" \t\n*?{`\\%#'\"|!")
 #  define SHELL_ESC_CHARS ((char_u *)" \t\n*?{`\\%#'|!()&")
 # else
@@ -304,15 +303,15 @@
 # endif
 #endif
 
-/* length of a buffer to store a number in ASCII (64 bits binary + NUL) */
+// length of a buffer to store a number in ASCII (64 bits binary + NUL)
 #define NUMBUFLEN 65
 
-/* flags for vim_str2nr() */
+// flags for vim_str2nr()
 #define STR2NR_BIN 1
 #define STR2NR_OCT 2
 #define STR2NR_HEX 4
 #define STR2NR_ALL (STR2NR_BIN + STR2NR_OCT + STR2NR_HEX)
-#define STR2NR_FORCE 8 /* only when ONE of the above is used */
+#define STR2NR_FORCE 8 // only when ONE of the above is used
 
 /*
  * Shorthand for unsigned variables. Many systems, but not all, have u_char
@@ -322,8 +321,8 @@
 typedef unsigned short	short_u;
 typedef unsigned int	int_u;
 
-/* Older systems do not have support for long long
- * use a typedef instead of hadcoded long long */
+// Older systems do not have support for long long
+// use a typedef instead of hadcoded long long
 #ifdef HAVE_NO_LONG_LONG
  typedef long long_long_T;
  typedef long unsigned long_long_u_T;
@@ -332,9 +331,9 @@
  typedef long long unsigned long_long_u_T;
 #endif
 
-/* Make sure long_u is big enough to hold a pointer.
- * On Win64, longs are 32 bits and pointers are 64 bits.
- * For printf() and scanf(), we need to take care of long_u specifically. */
+// Make sure long_u is big enough to hold a pointer.
+// On Win64, longs are 32 bits and pointers are 64 bits.
+// For printf() and scanf(), we need to take care of long_u specifically.
 #ifdef _WIN64
 typedef unsigned __int64	long_u;
 typedef		 __int64	long_i;
@@ -342,11 +341,10 @@
 # define SCANF_DECIMAL_LONG_U   "%Iu"
 # define PRINTF_HEX_LONG_U      "0x%Ix"
 #else
-  /* Microsoft-specific. The __w64 keyword should be specified on any typedefs
-   * that change size between 32-bit and 64-bit platforms.  For any such type,
-   * __w64 should appear only on the 32-bit definition of the typedef.
-   * Define __w64 as an empty token for everything but MSVC 7.x or later.
-   */
+  // Microsoft-specific. The __w64 keyword should be specified on any typedefs
+  // that change size between 32-bit and 64-bit platforms.  For any such type,
+  // __w64 should appear only on the 32-bit definition of the typedef.
+  // Define __w64 as an empty token for everything but MSVC 7.x or later.
 # if !defined(_MSC_VER)	|| (_MSC_VER < 1300)
 #  define __w64
 # endif
@@ -415,7 +413,7 @@
  */
 typedef unsigned int u8char_T;	// int is 32 bits or more
 
-#ifndef UNIX		    /* For Unix this is included in os_unix.h */
+#ifndef UNIX		    // For Unix this is included in os_unix.h
 # include <stdio.h>
 # include <ctype.h>
 #endif
@@ -445,8 +443,8 @@
  * These are also in os_unix.h, because osdef.sh needs them there.
  */
 #ifndef UNIX
-/* Note: Some systems need both string.h and strings.h (Savage).  If the
- * system can't handle this, define NO_STRINGS_WITH_STRING_H. */
+// Note: Some systems need both string.h and strings.h (Savage).  If the
+// system can't handle this, define NO_STRINGS_WITH_STRING_H.
 # ifdef HAVE_STRING_H
 #  include <string.h>
 # endif
@@ -459,7 +457,7 @@
 # ifdef HAVE_STDLIB_H
 #  include <stdlib.h>
 # endif
-#endif /* NON-UNIX */
+#endif // NON-UNIX
 
 #include <assert.h>
 
@@ -474,7 +472,7 @@
 #endif
 #include <stdarg.h>
 
-/* for offsetof() */
+// for offsetof()
 #include <stddef.h>
 
 #if defined(HAVE_SYS_SELECT_H) && \
@@ -494,7 +492,7 @@
 # endif
 #endif
 
-/* ================ end of the header file puzzle =============== */
+// ================ end of the header file puzzle ===============
 
 /*
  * For dynamically loaded imm library. Currently, only for Win32.
@@ -512,7 +510,7 @@
 # ifndef FEAT_GETTEXT
 #  define FEAT_GETTEXT
 # endif
-/* These are in os_win32.c */
+// These are in os_win32.c
 extern char *(*dyn_libintl_gettext)(const char *msgid);
 extern char *(*dyn_libintl_ngettext)(const char *msgid, const char *msgid_plural, unsigned long n);
 extern char *(*dyn_libintl_bindtextdomain)(const char *domainname, const char *dirname);
@@ -559,31 +557,31 @@
 # ifdef bindtextdomain
 #  undef bindtextdomain
 # endif
-# define bindtextdomain(x, y) /* empty */
+# define bindtextdomain(x, y) // empty
 # ifdef bind_textdomain_codeset
 #  undef bind_textdomain_codeset
 # endif
-# define bind_textdomain_codeset(x, y) /* empty */
+# define bind_textdomain_codeset(x, y) // empty
 # ifdef textdomain
 #  undef textdomain
 # endif
-# define textdomain(x) /* empty */
+# define textdomain(x) // empty
 #endif
 
 /*
  * flags for update_screen()
  * The higher the value, the higher the priority
  */
-#define VALID_NO_UPDATE		 5  /* no new changes, keep the command line if
-				       possible */
-#define VALID			10  /* buffer not changed, or changes marked
-				       with b_mod_* */
-#define INVERTED		20  /* redisplay inverted part that changed */
-#define INVERTED_ALL		25  /* redisplay whole inverted part */
-#define REDRAW_TOP		30  /* display first w_upd_rows screen lines */
-#define SOME_VALID		35  /* like NOT_VALID but may scroll */
-#define NOT_VALID		40  /* buffer needs complete redraw */
-#define CLEAR			50  /* screen messed up, clear it */
+#define VALID_NO_UPDATE		 5  // no new changes, keep the command line if
+				    // possible
+#define VALID			10  // buffer not changed, or changes marked
+				    // with b_mod_*
+#define INVERTED		20  // redisplay inverted part that changed
+#define INVERTED_ALL		25  // redisplay whole inverted part
+#define REDRAW_TOP		30  // display first w_upd_rows screen lines
+#define SOME_VALID		35  // like NOT_VALID but may scroll
+#define NOT_VALID		40  // buffer needs complete redraw
+#define CLEAR			50  // screen messed up, clear it
 
 /*
  * Flags for w_valid.
@@ -646,7 +644,7 @@
 #define HL_STRIKETHROUGH	0x80
 #define HL_ALL			0xff
 
-/* special attribute addition: Put message in history */
+// special attribute addition: Put message in history
 #define MSG_HIST		0x1000
 
 /*
@@ -657,50 +655,50 @@
  * these bits are set, no mapping is done.
  * The upper bits are used to distinguish between other states.
  */
-#define NORMAL		0x01	/* Normal mode, command expected */
-#define VISUAL		0x02	/* Visual mode - use get_real_state() */
-#define OP_PENDING	0x04	/* Normal mode, operator is pending - use
-				   get_real_state() */
-#define CMDLINE		0x08	/* Editing command line */
-#define INSERT		0x10	/* Insert mode */
-#define LANGMAP		0x20	/* Language mapping, can be combined with
-				   INSERT and CMDLINE */
+#define NORMAL		0x01	// Normal mode, command expected
+#define VISUAL		0x02	// Visual mode - use get_real_state()
+#define OP_PENDING	0x04	// Normal mode, operator is pending - use
+				// get_real_state()
+#define CMDLINE		0x08	// Editing command line
+#define INSERT		0x10	// Insert mode
+#define LANGMAP		0x20	// Language mapping, can be combined with
+				// INSERT and CMDLINE
 
-#define REPLACE_FLAG	0x40	/* Replace mode flag */
+#define REPLACE_FLAG	0x40	// Replace mode flag
 #define REPLACE		(REPLACE_FLAG + INSERT)
-#define VREPLACE_FLAG	0x80	/* Virtual-replace mode flag */
+#define VREPLACE_FLAG	0x80	// Virtual-replace mode flag
 #define VREPLACE	(REPLACE_FLAG + VREPLACE_FLAG + INSERT)
 #define LREPLACE	(REPLACE_FLAG + LANGMAP)
 
-#define NORMAL_BUSY	(0x100 + NORMAL) /* Normal mode, busy with a command */
-#define HITRETURN	(0x200 + NORMAL) /* waiting for return or command */
-#define ASKMORE		0x300	/* Asking if you want --more-- */
-#define SETWSIZE	0x400	/* window size has changed */
-#define ABBREV		0x500	/* abbreviation instead of mapping */
-#define EXTERNCMD	0x600	/* executing an external command */
-#define SHOWMATCH	(0x700 + INSERT) /* show matching paren */
-#define CONFIRM		0x800	/* ":confirm" prompt */
-#define SELECTMODE	0x1000	/* Select mode, only for mappings */
-#define TERMINAL        0x2000  /* Terminal mode */
+#define NORMAL_BUSY	(0x100 + NORMAL) // Normal mode, busy with a command
+#define HITRETURN	(0x200 + NORMAL) // waiting for return or command
+#define ASKMORE		0x300	// Asking if you want --more--
+#define SETWSIZE	0x400	// window size has changed
+#define ABBREV		0x500	// abbreviation instead of mapping
+#define EXTERNCMD	0x600	// executing an external command
+#define SHOWMATCH	(0x700 + INSERT) // show matching paren
+#define CONFIRM		0x800	// ":confirm" prompt
+#define SELECTMODE	0x1000	// Select mode, only for mappings
+#define TERMINAL        0x2000  // Terminal mode
 
-/* all mode bits used for mapping */
+// all mode bits used for mapping
 #define MAP_ALL_MODES	(0x3f | SELECTMODE | TERMINAL)
 
-/* directions */
+// directions
 #define FORWARD			1
 #define BACKWARD		(-1)
 #define FORWARD_FILE		3
 #define BACKWARD_FILE		(-3)
 
-/* return values for functions */
+// return values for functions
 #if !(defined(OK) && (OK == 1))
-/* OK already defined to 1 in MacOS X curses, skip this */
+// OK already defined to 1 in MacOS X curses, skip this
 # define OK			1
 #endif
 #define FAIL			0
-#define NOTDONE			2   /* not OK or FAIL but skipped */
+#define NOTDONE			2   // not OK or FAIL but skipped
 
-/* flags for b_flags */
+// flags for b_flags
 #define BF_RECOVERED	0x01	// buffer has been recovered
 #define BF_CHECK_RO	0x02	// need to check readonly when loading file
 				// into buffer (set by ":e", may be reset by
@@ -718,7 +716,7 @@
 #define BF_SYN_SET	0x200	// 'syntax' option was set
 #define BF_NO_SEA	0x400	// no swap_exists_action (ATTENTION prompt)
 
-/* Mask to check for flags that prevent normal writing */
+// Mask to check for flags that prevent normal writing
 #define BF_WRITE_MASK	(BF_NOTEDITED + BF_NEW + BF_READERR)
 
 /*
@@ -776,11 +774,11 @@
 #define EXPAND_MAPCLEAR		47
 #define EXPAND_ARGLIST		48
 
-/* Values for exmode_active (0 is no exmode) */
+// Values for exmode_active (0 is no exmode)
 #define EXMODE_NORMAL		1
 #define EXMODE_VIM		2
 
-/* Values for nextwild() and ExpandOne().  See ExpandOne() for meaning. */
+// Values for nextwild() and ExpandOne().  See ExpandOne() for meaning.
 #define WILD_FREE		1
 #define WILD_EXPAND_FREE	2
 #define WILD_EXPAND_KEEP	3
@@ -824,10 +822,10 @@
 #define EW_EMPTYOK	0x8000	// no matches is not an error
 #define EW_NOTENV	0x10000	// do not expand environment variables
 
-/* Flags for find_file_*() functions. */
-#define FINDFILE_FILE	0	/* only files */
-#define FINDFILE_DIR	1	/* only directories */
-#define FINDFILE_BOTH	2	/* files and directories */
+// Flags for find_file_*() functions.
+#define FINDFILE_FILE	0	// only files
+#define FINDFILE_DIR	1	// only directories
+#define FINDFILE_BOTH	2	// files and directories
 
 #define W_ENDCOL(wp)	(wp->w_wincol + wp->w_width)
 #ifdef FEAT_MENU
@@ -840,7 +838,7 @@
 # define gen_expand_wildcards mch_expand_wildcards
 #endif
 
-/* Values for the find_pattern_in_path() function args 'type' and 'action': */
+// Values for the find_pattern_in_path() function args 'type' and 'action':
 #define FIND_ANY	1
 #define FIND_DEFINE	2
 #define CHECK_PATH	3
@@ -852,47 +850,47 @@
 #define ACTION_EXPAND	5
 
 #ifdef FEAT_SYN_HL
-# define SST_MIN_ENTRIES 150	/* minimal size for state stack array */
-# define SST_MAX_ENTRIES 1000	/* maximal size for state stack array */
-# define SST_FIX_STATES	 7	/* size of sst_stack[]. */
-# define SST_DIST	 16	/* normal distance between entries */
-# define SST_INVALID	(synstate_T *)-1	/* invalid syn_state pointer */
+# define SST_MIN_ENTRIES 150	// minimal size for state stack array
+# define SST_MAX_ENTRIES 1000	// maximal size for state stack array
+# define SST_FIX_STATES	 7	// size of sst_stack[].
+# define SST_DIST	 16	// normal distance between entries
+# define SST_INVALID	(synstate_T *)-1	// invalid syn_state pointer
 
-# define HL_CONTAINED	0x01	/* not used on toplevel */
-# define HL_TRANSP	0x02	/* has no highlighting	*/
-# define HL_ONELINE	0x04	/* match within one line only */
-# define HL_HAS_EOL	0x08	/* end pattern that matches with $ */
-# define HL_SYNC_HERE	0x10	/* sync point after this item (syncing only) */
-# define HL_SYNC_THERE	0x20	/* sync point at current line (syncing only) */
-# define HL_MATCH	0x40	/* use match ID instead of item ID */
-# define HL_SKIPNL	0x80	/* nextgroup can skip newlines */
-# define HL_SKIPWHITE	0x100	/* nextgroup can skip white space */
-# define HL_SKIPEMPTY	0x200	/* nextgroup can skip empty lines */
-# define HL_KEEPEND	0x400	/* end match always kept */
-# define HL_EXCLUDENL	0x800	/* exclude NL from match */
-# define HL_DISPLAY	0x1000	/* only used for displaying, not syncing */
-# define HL_FOLD	0x2000	/* define fold */
-# define HL_EXTEND	0x4000	/* ignore a keepend */
-# define HL_MATCHCONT	0x8000	/* match continued from previous line */
-# define HL_TRANS_CONT	0x10000 /* transparent item without contains arg */
-# define HL_CONCEAL	0x20000 /* can be concealed */
-# define HL_CONCEALENDS	0x40000 /* can be concealed */
+# define HL_CONTAINED	0x01	// not used on toplevel
+# define HL_TRANSP	0x02	// has no highlighting
+# define HL_ONELINE	0x04	// match within one line only
+# define HL_HAS_EOL	0x08	// end pattern that matches with $
+# define HL_SYNC_HERE	0x10	// sync point after this item (syncing only)
+# define HL_SYNC_THERE	0x20	// sync point at current line (syncing only)
+# define HL_MATCH	0x40	// use match ID instead of item ID
+# define HL_SKIPNL	0x80	// nextgroup can skip newlines
+# define HL_SKIPWHITE	0x100	// nextgroup can skip white space
+# define HL_SKIPEMPTY	0x200	// nextgroup can skip empty lines
+# define HL_KEEPEND	0x400	// end match always kept
+# define HL_EXCLUDENL	0x800	// exclude NL from match
+# define HL_DISPLAY	0x1000	// only used for displaying, not syncing
+# define HL_FOLD	0x2000	// define fold
+# define HL_EXTEND	0x4000	// ignore a keepend
+# define HL_MATCHCONT	0x8000	// match continued from previous line
+# define HL_TRANS_CONT	0x10000 // transparent item without contains arg
+# define HL_CONCEAL	0x20000 // can be concealed
+# define HL_CONCEALENDS	0x40000 // can be concealed
 #endif
 
-/* Values for 'options' argument in do_search() and searchit() */
-#define SEARCH_REV    0x01  /* go in reverse of previous dir. */
-#define SEARCH_ECHO   0x02  /* echo the search command and handle options */
-#define SEARCH_MSG    0x0c  /* give messages (yes, it's not 0x04) */
-#define SEARCH_NFMSG  0x08  /* give all messages except not found */
-#define SEARCH_OPT    0x10  /* interpret optional flags */
-#define SEARCH_HIS    0x20  /* put search pattern in history */
-#define SEARCH_END    0x40  /* put cursor at end of match */
-#define SEARCH_NOOF   0x80  /* don't add offset to position */
-#define SEARCH_START 0x100  /* start search without col offset */
-#define SEARCH_MARK  0x200  /* set previous context mark */
-#define SEARCH_KEEP  0x400  /* keep previous search pattern */
-#define SEARCH_PEEK  0x800  /* peek for typed char, cancel search */
-#define SEARCH_COL  0x1000  /* start at specified column instead of zero */
+// Values for 'options' argument in do_search() and searchit()
+#define SEARCH_REV    0x01  // go in reverse of previous dir.
+#define SEARCH_ECHO   0x02  // echo the search command and handle options
+#define SEARCH_MSG    0x0c  // give messages (yes, it's not 0x04)
+#define SEARCH_NFMSG  0x08  // give all messages except not found
+#define SEARCH_OPT    0x10  // interpret optional flags
+#define SEARCH_HIS    0x20  // put search pattern in history
+#define SEARCH_END    0x40  // put cursor at end of match
+#define SEARCH_NOOF   0x80  // don't add offset to position
+#define SEARCH_START 0x100  // start search without col offset
+#define SEARCH_MARK  0x200  // set previous context mark
+#define SEARCH_KEEP  0x400  // keep previous search pattern
+#define SEARCH_PEEK  0x800  // peek for typed char, cancel search
+#define SEARCH_COL  0x1000  // start at specified column instead of zero
 
 // Values for find_ident_under_cursor()
 #define FIND_IDENT	1	// find identifier (word)
@@ -900,25 +898,25 @@
 #define FIND_EVAL	4	// include "->", "[]" and "."
 #define FIND_NOERROR	8	// no error when no word found
 
-/* Values for file_name_in_line() */
-#define FNAME_MESS	1	/* give error message */
-#define FNAME_EXP	2	/* expand to path */
-#define FNAME_HYP	4	/* check for hypertext link */
-#define FNAME_INCL	8	/* apply 'includeexpr' */
-#define FNAME_REL	16	/* ".." and "./" are relative to the (current)
-				   file instead of the current directory */
-#define FNAME_UNESC	32	/* remove backslashes used for escaping */
+// Values for file_name_in_line()
+#define FNAME_MESS	1	// give error message
+#define FNAME_EXP	2	// expand to path
+#define FNAME_HYP	4	// check for hypertext link
+#define FNAME_INCL	8	// apply 'includeexpr'
+#define FNAME_REL	16	// ".." and "./" are relative to the (current)
+				// file instead of the current directory
+#define FNAME_UNESC	32	// remove backslashes used for escaping
 
-/* Values for buflist_getfile() */
-#define GETF_SETMARK	0x01	/* set pcmark before jumping */
-#define GETF_ALT	0x02	/* jumping to alternate file (not buf num) */
-#define GETF_SWITCH	0x04	/* respect 'switchbuf' settings when jumping */
+// Values for buflist_getfile()
+#define GETF_SETMARK	0x01	// set pcmark before jumping
+#define GETF_ALT	0x02	// jumping to alternate file (not buf num)
+#define GETF_SWITCH	0x04	// respect 'switchbuf' settings when jumping
 
-/* Return values of getfile() */
-#define GETFILE_ERROR	    1	/* normal error */
-#define GETFILE_NOT_WRITTEN 2	/* "not written" error */
-#define GETFILE_SAME_FILE   0	/* success, same file */
-#define GETFILE_OPEN_OTHER -1	/* success, opened another file */
+// Return values of getfile()
+#define GETFILE_ERROR	    1	// normal error
+#define GETFILE_NOT_WRITTEN 2	// "not written" error
+#define GETFILE_SAME_FILE   0	// success, same file
+#define GETFILE_OPEN_OTHER -1	// success, opened another file
 #define GETFILE_UNUSED	    8
 #define GETFILE_SUCCESS(x)  ((x) <= 0)
 
@@ -931,52 +929,52 @@
 #define BLN_DUMMY_OK	32	// also find an existing dummy buffer
 #define BLN_REUSE	64	// may re-use number from buf_reuse
 
-/* Values for in_cinkeys() */
+// Values for in_cinkeys()
 #define KEY_OPEN_FORW	0x101
 #define KEY_OPEN_BACK	0x102
-#define KEY_COMPLETE	0x103	/* end of completion */
+#define KEY_COMPLETE	0x103	// end of completion
 
-/* Values for "noremap" argument of ins_typebuf().  Also used for
- * map->m_noremap and menu->noremap[]. */
-#define REMAP_YES	0	/* allow remapping */
-#define REMAP_NONE	-1	/* no remapping */
-#define REMAP_SCRIPT	-2	/* remap script-local mappings only */
-#define REMAP_SKIP	-3	/* no remapping for first char */
+// Values for "noremap" argument of ins_typebuf().  Also used for
+// map->m_noremap and menu->noremap[].
+#define REMAP_YES	0	// allow remapping
+#define REMAP_NONE	-1	// no remapping
+#define REMAP_SCRIPT	-2	// remap script-local mappings only
+#define REMAP_SKIP	-3	// no remapping for first char
 
-/* Values for mch_call_shell() second argument */
-#define SHELL_FILTER	1	/* filtering text */
-#define SHELL_EXPAND	2	/* expanding wildcards */
-#define SHELL_COOKED	4	/* set term to cooked mode */
-#define SHELL_DOOUT	8	/* redirecting output */
-#define SHELL_SILENT	16	/* don't print error returned by command */
-#define SHELL_READ	32	/* read lines and insert into buffer */
-#define SHELL_WRITE	64	/* write lines from buffer */
+// Values for mch_call_shell() second argument
+#define SHELL_FILTER	1	// filtering text
+#define SHELL_EXPAND	2	// expanding wildcards
+#define SHELL_COOKED	4	// set term to cooked mode
+#define SHELL_DOOUT	8	// redirecting output
+#define SHELL_SILENT	16	// don't print error returned by command
+#define SHELL_READ	32	// read lines and insert into buffer
+#define SHELL_WRITE	64	// write lines from buffer
 
-/* Values returned by mch_nodetype() */
-#define NODE_NORMAL	0	/* file or directory, check with mch_isdir()*/
-#define NODE_WRITABLE	1	/* something we can write to (character
-				   device, fifo, socket, ..) */
-#define NODE_OTHER	2	/* non-writable thing (e.g., block device) */
+// Values returned by mch_nodetype()
+#define NODE_NORMAL	0	// file or directory, check with mch_isdir()
+#define NODE_WRITABLE	1	// something we can write to (character
+				// device, fifo, socket, ..)
+#define NODE_OTHER	2	// non-writable thing (e.g., block device)
 
-/* Values for readfile() flags */
-#define READ_NEW	0x01	/* read a file into a new buffer */
-#define READ_FILTER	0x02	/* read filter output */
-#define READ_STDIN	0x04	/* read from stdin */
-#define READ_BUFFER	0x08	/* read from curbuf (converting stdin) */
-#define READ_DUMMY	0x10	/* reading into a dummy buffer */
-#define READ_KEEP_UNDO	0x20	/* keep undo info */
-#define READ_FIFO	0x40	/* read from fifo or socket */
+// Values for readfile() flags
+#define READ_NEW	0x01	// read a file into a new buffer
+#define READ_FILTER	0x02	// read filter output
+#define READ_STDIN	0x04	// read from stdin
+#define READ_BUFFER	0x08	// read from curbuf (converting stdin)
+#define READ_DUMMY	0x10	// reading into a dummy buffer
+#define READ_KEEP_UNDO	0x20	// keep undo info
+#define READ_FIFO	0x40	// read from fifo or socket
 
-/* Values for change_indent() */
-#define INDENT_SET	1	/* set indent */
-#define INDENT_INC	2	/* increase indent */
-#define INDENT_DEC	3	/* decrease indent */
+// Values for change_indent()
+#define INDENT_SET	1	// set indent
+#define INDENT_INC	2	// increase indent
+#define INDENT_DEC	3	// decrease indent
 
-/* Values for flags argument for findmatchlimit() */
-#define FM_BACKWARD	0x01	/* search backwards */
-#define FM_FORWARD	0x02	/* search forwards */
-#define FM_BLOCKSTOP	0x04	/* stop at start/end of block */
-#define FM_SKIPCOMM	0x08	/* skip comments */
+// Values for flags argument for findmatchlimit()
+#define FM_BACKWARD	0x01	// search backwards
+#define FM_FORWARD	0x02	// search forwards
+#define FM_BLOCKSTOP	0x04	// stop at start/end of block
+#define FM_SKIPCOMM	0x08	// skip comments
 
 // Values for action argument for do_buffer() and close_buffer()
 #define DOBUF_GOTO	0	// go to specified buffer
@@ -986,115 +984,113 @@
 #define DOBUF_WIPE	4	// delete specified buffer(s) really
 #define DOBUF_WIPE_REUSE 5	// like DOBUF_WIPE an keep number for reuse
 
-/* Values for start argument for do_buffer() */
-#define DOBUF_CURRENT	0	/* "count" buffer from current buffer */
-#define DOBUF_FIRST	1	/* "count" buffer from first buffer */
-#define DOBUF_LAST	2	/* "count" buffer from last buffer */
-#define DOBUF_MOD	3	/* "count" mod. buffer from current buffer */
+// Values for start argument for do_buffer()
+#define DOBUF_CURRENT	0	// "count" buffer from current buffer
+#define DOBUF_FIRST	1	// "count" buffer from first buffer
+#define DOBUF_LAST	2	// "count" buffer from last buffer
+#define DOBUF_MOD	3	// "count" mod. buffer from current buffer
 
-/* Values for sub_cmd and which_pat argument for search_regcomp() */
-/* Also used for which_pat argument for searchit() */
-#define RE_SEARCH	0	/* save/use pat in/from search_pattern */
-#define RE_SUBST	1	/* save/use pat in/from subst_pattern */
-#define RE_BOTH		2	/* save pat in both patterns */
-#define RE_LAST		2	/* use last used pattern if "pat" is NULL */
+// Values for sub_cmd and which_pat argument for search_regcomp()
+// Also used for which_pat argument for searchit()
+#define RE_SEARCH	0	// save/use pat in/from search_pattern
+#define RE_SUBST	1	// save/use pat in/from subst_pattern
+#define RE_BOTH		2	// save pat in both patterns
+#define RE_LAST		2	// use last used pattern if "pat" is NULL
 
-/* Second argument for vim_regcomp(). */
-#define RE_MAGIC	1	/* 'magic' option */
-#define RE_STRING	2	/* match in string instead of buffer text */
-#define RE_STRICT	4	/* don't allow [abc] without ] */
-#define RE_AUTO		8	/* automatic engine selection */
+// Second argument for vim_regcomp().
+#define RE_MAGIC	1	// 'magic' option
+#define RE_STRING	2	// match in string instead of buffer text
+#define RE_STRICT	4	// don't allow [abc] without ]
+#define RE_AUTO		8	// automatic engine selection
 
 #ifdef FEAT_SYN_HL
-/* values for reg_do_extmatch */
-# define REX_SET	1	/* to allow \z\(...\), */
-# define REX_USE	2	/* to allow \z\1 et al. */
+// values for reg_do_extmatch
+# define REX_SET	1	// to allow \z\(...\),
+# define REX_USE	2	// to allow \z\1 et al.
 # define REX_ALL	(REX_SET | REX_USE)
 #endif
 
-/* Return values for fullpathcmp() */
-/* Note: can use (fullpathcmp() & FPC_SAME) to check for equal files */
-#define FPC_SAME	1	/* both exist and are the same file. */
-#define FPC_DIFF	2	/* both exist and are different files. */
-#define FPC_NOTX	4	/* both don't exist. */
-#define FPC_DIFFX	6	/* one of them doesn't exist. */
-#define FPC_SAMEX	7	/* both don't exist and file names are same. */
+// Return values for fullpathcmp()
+// Note: can use (fullpathcmp() & FPC_SAME) to check for equal files
+#define FPC_SAME	1	// both exist and are the same file.
+#define FPC_DIFF	2	// both exist and are different files.
+#define FPC_NOTX	4	// both don't exist.
+#define FPC_DIFFX	6	// one of them doesn't exist.
+#define FPC_SAMEX	7	// both don't exist and file names are same.
 
-/* flags for do_ecmd() */
-#define ECMD_HIDE	0x01	/* don't free the current buffer */
-#define ECMD_SET_HELP	0x02	/* set b_help flag of (new) buffer before
-				   opening file */
-#define ECMD_OLDBUF	0x04	/* use existing buffer if it exists */
-#define ECMD_FORCEIT	0x08	/* ! used in Ex command */
-#define ECMD_ADDBUF	0x10	/* don't edit, just add to buffer list */
+// flags for do_ecmd()
+#define ECMD_HIDE	0x01	// don't free the current buffer
+#define ECMD_SET_HELP	0x02	// set b_help flag of (new) buffer before
+				// opening file
+#define ECMD_OLDBUF	0x04	// use existing buffer if it exists
+#define ECMD_FORCEIT	0x08	// ! used in Ex command
+#define ECMD_ADDBUF	0x10	// don't edit, just add to buffer list
 
-/* for lnum argument in do_ecmd() */
-#define ECMD_LASTL	(linenr_T)0	/* use last position in loaded file */
-#define ECMD_LAST	(linenr_T)-1	/* use last position in all files */
-#define ECMD_ONE	(linenr_T)1	/* use first line */
+// for lnum argument in do_ecmd()
+#define ECMD_LASTL	(linenr_T)0	// use last position in loaded file
+#define ECMD_LAST	(linenr_T)-1	// use last position in all files
+#define ECMD_ONE	(linenr_T)1	// use first line
 
-/* flags for do_cmdline() */
-#define DOCMD_VERBOSE	0x01	/* included command in error message */
-#define DOCMD_NOWAIT	0x02	/* don't call wait_return() and friends */
-#define DOCMD_REPEAT	0x04	/* repeat exec. until getline() returns NULL */
-#define DOCMD_KEYTYPED	0x08	/* don't reset KeyTyped */
-#define DOCMD_EXCRESET	0x10	/* reset exception environment (for debugging)*/
-#define DOCMD_KEEPLINE  0x20	/* keep typed line for repeating with "." */
+// flags for do_cmdline()
+#define DOCMD_VERBOSE	0x01	// included command in error message
+#define DOCMD_NOWAIT	0x02	// don't call wait_return() and friends
+#define DOCMD_REPEAT	0x04	// repeat exec. until getline() returns NULL
+#define DOCMD_KEYTYPED	0x08	// don't reset KeyTyped
+#define DOCMD_EXCRESET	0x10	// reset exception environment (for debugging)
+#define DOCMD_KEEPLINE  0x20	// keep typed line for repeating with "."
 
-/* flags for beginline() */
-#define BL_WHITE	1	/* cursor on first non-white in the line */
-#define BL_SOL		2	/* use 'sol' option */
-#define BL_FIX		4	/* don't leave cursor on a NUL */
+// flags for beginline()
+#define BL_WHITE	1	// cursor on first non-white in the line
+#define BL_SOL		2	// use 'sol' option
+#define BL_FIX		4	// don't leave cursor on a NUL
 
-/* flags for mf_sync() */
-#define MFS_ALL		1	/* also sync blocks with negative numbers */
-#define MFS_STOP	2	/* stop syncing when a character is available */
-#define MFS_FLUSH	4	/* flushed file to disk */
-#define MFS_ZERO	8	/* only write block 0 */
+// flags for mf_sync()
+#define MFS_ALL		1	// also sync blocks with negative numbers
+#define MFS_STOP	2	// stop syncing when a character is available
+#define MFS_FLUSH	4	// flushed file to disk
+#define MFS_ZERO	8	// only write block 0
 
-/* flags for buf_copy_options() */
-#define BCO_ENTER	1	/* going to enter the buffer */
-#define BCO_ALWAYS	2	/* always copy the options */
-#define BCO_NOHELP	4	/* don't touch the help related options */
+// flags for buf_copy_options()
+#define BCO_ENTER	1	// going to enter the buffer
+#define BCO_ALWAYS	2	// always copy the options
+#define BCO_NOHELP	4	// don't touch the help related options
 
-/* flags for do_put() */
-#define PUT_FIXINDENT	1	/* make indent look nice */
-#define PUT_CURSEND	2	/* leave cursor after end of new text */
-#define PUT_CURSLINE	4	/* leave cursor on last line of new text */
-#define PUT_LINE	8	/* put register as lines */
-#define PUT_LINE_SPLIT	16	/* split line for linewise register */
-#define PUT_LINE_FORWARD 32	/* put linewise register below Visual sel. */
+// flags for do_put()
+#define PUT_FIXINDENT	1	// make indent look nice
+#define PUT_CURSEND	2	// leave cursor after end of new text
+#define PUT_CURSLINE	4	// leave cursor on last line of new text
+#define PUT_LINE	8	// put register as lines
+#define PUT_LINE_SPLIT	16	// split line for linewise register
+#define PUT_LINE_FORWARD 32	// put linewise register below Visual sel.
 
-/* flags for set_indent() */
-#define SIN_CHANGED	1	/* call changed_bytes() when line changed */
-#define SIN_INSERT	2	/* insert indent before existing text */
-#define SIN_UNDO	4	/* save line for undo before changing it */
+// flags for set_indent()
+#define SIN_CHANGED	1	// call changed_bytes() when line changed
+#define SIN_INSERT	2	// insert indent before existing text
+#define SIN_UNDO	4	// save line for undo before changing it
 
-/* flags for insertchar() */
-#define INSCHAR_FORMAT	1	/* force formatting */
-#define INSCHAR_DO_COM	2	/* format comments */
-#define INSCHAR_CTRLV	4	/* char typed just after CTRL-V */
-#define INSCHAR_NO_FEX	8	/* don't use 'formatexpr' */
-#define INSCHAR_COM_LIST 16	/* format comments with list/2nd line indent */
+// flags for insertchar()
+#define INSCHAR_FORMAT	1	// force formatting
+#define INSCHAR_DO_COM	2	// format comments
+#define INSCHAR_CTRLV	4	// char typed just after CTRL-V
+#define INSCHAR_NO_FEX	8	// don't use 'formatexpr'
+#define INSCHAR_COM_LIST 16	// format comments with list/2nd line indent
 
-/* flags for open_line() */
-#define OPENLINE_DELSPACES  1	/* delete spaces after cursor */
-#define OPENLINE_DO_COM	    2	/* format comments */
-#define OPENLINE_KEEPTRAIL  4	/* keep trailing spaces */
-#define OPENLINE_MARKFIX    8	/* fix mark positions */
-#define OPENLINE_COM_LIST  16	/* format comments with list/2nd line indent */
+// flags for open_line()
+#define OPENLINE_DELSPACES  1	// delete spaces after cursor
+#define OPENLINE_DO_COM	    2	// format comments
+#define OPENLINE_KEEPTRAIL  4	// keep trailing spaces
+#define OPENLINE_MARKFIX    8	// fix mark positions
+#define OPENLINE_COM_LIST  16	// format comments with list/2nd line indent
 
-/*
- * There are five history tables:
- */
-#define HIST_CMD	0	/* colon commands */
-#define HIST_SEARCH	1	/* search commands */
-#define HIST_EXPR	2	/* expressions (from entering = register) */
-#define HIST_INPUT	3	/* input() lines */
-#define HIST_DEBUG	4	/* debug commands */
-#define HIST_COUNT	5	/* number of history tables */
+// There are five history tables:
+#define HIST_CMD	0	// colon commands
+#define HIST_SEARCH	1	// search commands
+#define HIST_EXPR	2	// expressions (from entering = register)
+#define HIST_INPUT	3	// input() lines
+#define HIST_DEBUG	4	// debug commands
+#define HIST_COUNT	5	// number of history tables
 
-/* The type numbers are fixed for backwards compatibility. */
+// The type numbers are fixed for backwards compatibility.
 #define BARTYPE_VERSION 1
 #define BARTYPE_HISTORY 2
 #define BARTYPE_REGISTER 3
@@ -1115,25 +1111,25 @@
     btype_T	bv_type;
     long	bv_nr;
     char_u	*bv_string;
-    int		bv_len;		/* length of bv_string */
-    int		bv_allocated;	/* bv_string was allocated */
+    int		bv_len;		// length of bv_string
+    int		bv_allocated;	// bv_string was allocated
 } bval_T;
 
 /*
  * Values for do_tag().
  */
-#define DT_TAG		1	/* jump to newer position or same tag again */
-#define DT_POP		2	/* jump to older position */
-#define DT_NEXT		3	/* jump to next match of same tag */
-#define DT_PREV		4	/* jump to previous match of same tag */
-#define DT_FIRST	5	/* jump to first match of same tag */
-#define DT_LAST		6	/* jump to first match of same tag */
-#define DT_SELECT	7	/* jump to selection from list */
-#define DT_HELP		8	/* like DT_TAG, but no wildcards */
-#define DT_JUMP		9	/* jump to new tag or selection from list */
-#define DT_CSCOPE	10	/* cscope find command (like tjump) */
-#define DT_LTAG		11	/* tag using location list */
-#define DT_FREE		99	/* free cached matches */
+#define DT_TAG		1	// jump to newer position or same tag again
+#define DT_POP		2	// jump to older position
+#define DT_NEXT		3	// jump to next match of same tag
+#define DT_PREV		4	// jump to previous match of same tag
+#define DT_FIRST	5	// jump to first match of same tag
+#define DT_LAST		6	// jump to first match of same tag
+#define DT_SELECT	7	// jump to selection from list
+#define DT_HELP		8	// like DT_TAG, but no wildcards
+#define DT_JUMP		9	// jump to new tag or selection from list
+#define DT_CSCOPE	10	// cscope find command (like tjump)
+#define DT_LTAG		11	// tag using location list
+#define DT_FREE		99	// free cached matches
 
 /*
  * flags for find_tags().
@@ -1161,7 +1157,7 @@
 #define VIM_WARNING	2
 #define VIM_INFO	3
 #define VIM_QUESTION	4
-#define VIM_LAST_TYPE	4	/* sentinel value */
+#define VIM_LAST_TYPE	4	// sentinel value
 
 /*
  * Return values for functions like gui_yesnocancel()
@@ -1175,57 +1171,57 @@
 /*
  * arguments for win_split()
  */
-#define WSP_ROOM	1	/* require enough room */
-#define WSP_VERT	2	/* split vertically */
-#define WSP_TOP		4	/* window at top-left of shell */
-#define WSP_BOT		8	/* window at bottom-right of shell */
-#define WSP_HELP	16	/* creating the help window */
-#define WSP_BELOW	32	/* put new window below/right */
-#define WSP_ABOVE	64	/* put new window above/left */
-#define WSP_NEWLOC	128	/* don't copy location list */
+#define WSP_ROOM	1	// require enough room
+#define WSP_VERT	2	// split vertically
+#define WSP_TOP		4	// window at top-left of shell
+#define WSP_BOT		8	// window at bottom-right of shell
+#define WSP_HELP	16	// creating the help window
+#define WSP_BELOW	32	// put new window below/right
+#define WSP_ABOVE	64	// put new window above/left
+#define WSP_NEWLOC	128	// don't copy location list
 
 /*
  * arguments for gui_set_shellsize()
  */
-#define RESIZE_VERT	1	/* resize vertically */
-#define RESIZE_HOR	2	/* resize horizontally */
-#define RESIZE_BOTH	15	/* resize in both directions */
+#define RESIZE_VERT	1	// resize vertically
+#define RESIZE_HOR	2	// resize horizontally
+#define RESIZE_BOTH	15	// resize in both directions
 
 /*
  * flags for check_changed()
  */
-#define CCGD_AW		1	/* do autowrite if buffer was changed */
-#define CCGD_MULTWIN	2	/* check also when several wins for the buf */
-#define CCGD_FORCEIT	4	/* ! used */
-#define CCGD_ALLBUF	8	/* may write all buffers */
-#define CCGD_EXCMD	16	/* may suggest using ! */
+#define CCGD_AW		1	// do autowrite if buffer was changed
+#define CCGD_MULTWIN	2	// check also when several wins for the buf
+#define CCGD_FORCEIT	4	// ! used
+#define CCGD_ALLBUF	8	// may write all buffers
+#define CCGD_EXCMD	16	// may suggest using !
 
 /*
  * "flags" values for option-setting functions.
  * When OPT_GLOBAL and OPT_LOCAL are both missing, set both local and global
  * values, get local value.
  */
-#define OPT_FREE	1	/* free old value if it was allocated */
-#define OPT_GLOBAL	2	/* use global value */
-#define OPT_LOCAL	4	/* use local value */
-#define OPT_MODELINE	8	/* option in modeline */
-#define OPT_WINONLY	16	/* only set window-local options */
-#define OPT_NOWIN	32	/* don't set window-local options */
+#define OPT_FREE	1	// free old value if it was allocated
+#define OPT_GLOBAL	2	// use global value
+#define OPT_LOCAL	4	// use local value
+#define OPT_MODELINE	8	// option in modeline
+#define OPT_WINONLY	16	// only set window-local options
+#define OPT_NOWIN	32	// don't set window-local options
 
-/* Magic chars used in confirm dialog strings */
+// Magic chars used in confirm dialog strings
 #define DLG_BUTTON_SEP	'\n'
 #define DLG_HOTKEY_CHAR	'&'
 
-/* Values for "starting" */
-#define NO_SCREEN	2	/* no screen updating yet */
-#define NO_BUFFERS	1	/* not all buffers loaded yet */
-/*			0	   not starting anymore */
+// Values for "starting"
+#define NO_SCREEN	2	// no screen updating yet
+#define NO_BUFFERS	1	// not all buffers loaded yet
+//			0	   not starting anymore
 
-/* Values for swap_exists_action: what to do when swap file already exists */
-#define SEA_NONE	0	/* don't use dialog */
-#define SEA_DIALOG	1	/* use dialog when possible */
-#define SEA_QUIT	2	/* quit editing the file */
-#define SEA_RECOVER	3	/* recover the file */
+// Values for swap_exists_action: what to do when swap file already exists
+#define SEA_NONE	0	// don't use dialog
+#define SEA_DIALOG	1	// use dialog when possible
+#define SEA_QUIT	2	// quit editing the file
+#define SEA_RECOVER	3	// recover the file
 
 /*
  * Minimal size for block 0 of a swap file.
@@ -1236,13 +1232,13 @@
 #define MIN_SWAP_PAGE_SIZE 1048
 #define MAX_SWAP_PAGE_SIZE 50000
 
-/* Special values for current_sctx.sc_sid. */
-#define SID_MODELINE	-1	/* when using a modeline */
-#define SID_CMDARG	-2	/* for "--cmd" argument */
-#define SID_CARG	-3	/* for "-c" argument */
-#define SID_ENV		-4	/* for sourcing environment variable */
-#define SID_ERROR	-5	/* option was reset because of an error */
-#define SID_NONE	-6	/* don't set scriptID */
+// Special values for current_sctx.sc_sid.
+#define SID_MODELINE	-1	// when using a modeline
+#define SID_CMDARG	-2	// for "--cmd" argument
+#define SID_CARG	-3	// for "-c" argument
+#define SID_ENV		-4	// for sourcing environment variable
+#define SID_ERROR	-5	// option was reset because of an error
+#define SID_NONE	-6	// don't set scriptID
 
 /*
  * Events for autocommands.
@@ -1361,59 +1357,59 @@
  */
 typedef enum
 {
-    HLF_8 = 0	    /* Meta & special keys listed with ":map", text that is
-		       displayed different from what it is */
-    , HLF_EOB	    /* after the last line in the buffer */
-    , HLF_AT	    /* @ characters at end of screen, characters that
-		       don't really exist in the text */
-    , HLF_D	    /* directories in CTRL-D listing */
-    , HLF_E	    /* error messages */
-    , HLF_H	    /* obsolete, ignored */
-    , HLF_I	    /* incremental search */
-    , HLF_L	    /* last search string */
-    , HLF_M	    /* "--More--" message */
-    , HLF_CM	    /* Mode (e.g., "-- INSERT --") */
-    , HLF_N	    /* line number for ":number" and ":#" commands */
-    , HLF_CLN	    /* current line number */
-    , HLF_R	    /* return to continue message and yes/no questions */
-    , HLF_S	    /* status lines */
-    , HLF_SNC	    /* status lines of not-current windows */
-    , HLF_C	    /* column to separate vertically split windows */
-    , HLF_T	    /* Titles for output from ":set all", ":autocmd" etc. */
-    , HLF_V	    /* Visual mode */
-    , HLF_VNC	    /* Visual mode, autoselecting and not clipboard owner */
-    , HLF_W	    /* warning messages */
-    , HLF_WM	    /* Wildmenu highlight */
-    , HLF_FL	    /* Folded line */
-    , HLF_FC	    /* Fold column */
-    , HLF_ADD	    /* Added diff line */
-    , HLF_CHD	    /* Changed diff line */
-    , HLF_DED	    /* Deleted diff line */
-    , HLF_TXD	    /* Text Changed in diff line */
-    , HLF_CONCEAL   /* Concealed text */
-    , HLF_SC	    /* Sign column */
-    , HLF_SPB	    /* SpellBad */
-    , HLF_SPC	    /* SpellCap */
-    , HLF_SPR	    /* SpellRare */
-    , HLF_SPL	    /* SpellLocal */
-    , HLF_PNI	    /* popup menu normal item */
-    , HLF_PSI	    /* popup menu selected item */
-    , HLF_PSB	    /* popup menu scrollbar */
-    , HLF_PST	    /* popup menu scrollbar thumb */
-    , HLF_TP	    /* tabpage line */
-    , HLF_TPS	    /* tabpage line selected */
-    , HLF_TPF	    /* tabpage line filler */
-    , HLF_CUC	    /* 'cursorcolumn' */
-    , HLF_CUL	    /* 'cursorline' */
-    , HLF_MC	    /* 'colorcolumn' */
-    , HLF_QFL	    /* quickfix window line currently selected */
-    , HLF_ST	    /* status lines of terminal windows */
-    , HLF_STNC	    /* status lines of not-current terminal windows */
-    , HLF_COUNT	    /* MUST be the last one */
+    HLF_8 = 0	    // Meta & special keys listed with ":map", text that is
+		    // displayed different from what it is
+    , HLF_EOB	    // after the last line in the buffer
+    , HLF_AT	    // @ characters at end of screen, characters that
+		    // don't really exist in the text
+    , HLF_D	    // directories in CTRL-D listing
+    , HLF_E	    // error messages
+    , HLF_H	    // obsolete, ignored
+    , HLF_I	    // incremental search
+    , HLF_L	    // last search string
+    , HLF_M	    // "--More--" message
+    , HLF_CM	    // Mode (e.g., "-- INSERT --")
+    , HLF_N	    // line number for ":number" and ":#" commands
+    , HLF_CLN	    // current line number
+    , HLF_R	    // return to continue message and yes/no questions
+    , HLF_S	    // status lines
+    , HLF_SNC	    // status lines of not-current windows
+    , HLF_C	    // column to separate vertically split windows
+    , HLF_T	    // Titles for output from ":set all", ":autocmd" etc.
+    , HLF_V	    // Visual mode
+    , HLF_VNC	    // Visual mode, autoselecting and not clipboard owner
+    , HLF_W	    // warning messages
+    , HLF_WM	    // Wildmenu highlight
+    , HLF_FL	    // Folded line
+    , HLF_FC	    // Fold column
+    , HLF_ADD	    // Added diff line
+    , HLF_CHD	    // Changed diff line
+    , HLF_DED	    // Deleted diff line
+    , HLF_TXD	    // Text Changed in diff line
+    , HLF_CONCEAL   // Concealed text
+    , HLF_SC	    // Sign column
+    , HLF_SPB	    // SpellBad
+    , HLF_SPC	    // SpellCap
+    , HLF_SPR	    // SpellRare
+    , HLF_SPL	    // SpellLocal
+    , HLF_PNI	    // popup menu normal item
+    , HLF_PSI	    // popup menu selected item
+    , HLF_PSB	    // popup menu scrollbar
+    , HLF_PST	    // popup menu scrollbar thumb
+    , HLF_TP	    // tabpage line
+    , HLF_TPS	    // tabpage line selected
+    , HLF_TPF	    // tabpage line filler
+    , HLF_CUC	    // 'cursorcolumn'
+    , HLF_CUL	    // 'cursorline'
+    , HLF_MC	    // 'colorcolumn'
+    , HLF_QFL	    // quickfix window line currently selected
+    , HLF_ST	    // status lines of terminal windows
+    , HLF_STNC	    // status lines of not-current terminal windows
+    , HLF_COUNT	    // MUST be the last one
 } hlf_T;
 
-/* The HL_FLAGS must be in the same order as the HLF_ enums!
- * When changing this also adjust the default for 'highlight'. */
+// The HL_FLAGS must be in the same order as the HLF_ enums!
+// When changing this also adjust the default for 'highlight'.
 #define HL_FLAGS {'8', '~', '@', 'd', 'e', 'h', 'i', 'l', 'm', 'M', \
 		  'n', 'N', 'r', 's', 'S', 'c', 't', 'v', 'V', 'w', 'W', \
 		  'f', 'F', 'A', 'C', 'D', 'T', '-', '>', \
@@ -1425,11 +1421,11 @@
  * Boolean constants
  */
 #ifndef TRUE
-# define FALSE	0	    /* note: this is an int, not a long! */
+# define FALSE	0	    // note: this is an int, not a long!
 # define TRUE	1
 #endif
 
-#define MAYBE	2	    /* sometimes used for a variant on TRUE */
+#define MAYBE	2	    // sometimes used for a variant on TRUE
 
 #ifndef UINT32_T
 typedef UINT32_TYPEDEF UINT32_T;
@@ -1438,87 +1434,87 @@
 /*
  * Operator IDs; The order must correspond to opchars[] in ops.c!
  */
-#define OP_NOP		0	/* no pending operation */
-#define OP_DELETE	1	/* "d"  delete operator */
-#define OP_YANK		2	/* "y"  yank operator */
-#define OP_CHANGE	3	/* "c"  change operator */
-#define OP_LSHIFT	4	/* "<"  left shift operator */
-#define OP_RSHIFT	5	/* ">"  right shift operator */
-#define OP_FILTER	6	/* "!"  filter operator */
-#define OP_TILDE	7	/* "g~" switch case operator */
-#define OP_INDENT	8	/* "="  indent operator */
-#define OP_FORMAT	9	/* "gq" format operator */
-#define OP_COLON	10	/* ":"  colon operator */
-#define OP_UPPER	11	/* "gU" make upper case operator */
-#define OP_LOWER	12	/* "gu" make lower case operator */
-#define OP_JOIN		13	/* "J"  join operator, only for Visual mode */
-#define OP_JOIN_NS	14	/* "gJ"  join operator, only for Visual mode */
-#define OP_ROT13	15	/* "g?" rot-13 encoding */
-#define OP_REPLACE	16	/* "r"  replace chars, only for Visual mode */
-#define OP_INSERT	17	/* "I"  Insert column, only for Visual mode */
-#define OP_APPEND	18	/* "A"  Append column, only for Visual mode */
-#define OP_FOLD		19	/* "zf" define a fold */
-#define OP_FOLDOPEN	20	/* "zo" open folds */
-#define OP_FOLDOPENREC	21	/* "zO" open folds recursively */
-#define OP_FOLDCLOSE	22	/* "zc" close folds */
-#define OP_FOLDCLOSEREC	23	/* "zC" close folds recursively */
-#define OP_FOLDDEL	24	/* "zd" delete folds */
-#define OP_FOLDDELREC	25	/* "zD" delete folds recursively */
-#define OP_FORMAT2	26	/* "gw" format operator, keeps cursor pos */
-#define OP_FUNCTION	27	/* "g@" call 'operatorfunc' */
-#define OP_NR_ADD	28	/* "<C-A>" Add to the number or alphabetic
-				   character (OP_ADD conflicts with Perl) */
-#define OP_NR_SUB	29	/* "<C-X>" Subtract from the number or
-				   alphabetic character */
+#define OP_NOP		0	// no pending operation
+#define OP_DELETE	1	// "d"  delete operator
+#define OP_YANK		2	// "y"  yank operator
+#define OP_CHANGE	3	// "c"  change operator
+#define OP_LSHIFT	4	// "<"  left shift operator
+#define OP_RSHIFT	5	// ">"  right shift operator
+#define OP_FILTER	6	// "!"  filter operator
+#define OP_TILDE	7	// "g~" switch case operator
+#define OP_INDENT	8	// "="  indent operator
+#define OP_FORMAT	9	// "gq" format operator
+#define OP_COLON	10	// ":"  colon operator
+#define OP_UPPER	11	// "gU" make upper case operator
+#define OP_LOWER	12	// "gu" make lower case operator
+#define OP_JOIN		13	// "J"  join operator, only for Visual mode
+#define OP_JOIN_NS	14	// "gJ"  join operator, only for Visual mode
+#define OP_ROT13	15	// "g?" rot-13 encoding
+#define OP_REPLACE	16	// "r"  replace chars, only for Visual mode
+#define OP_INSERT	17	// "I"  Insert column, only for Visual mode
+#define OP_APPEND	18	// "A"  Append column, only for Visual mode
+#define OP_FOLD		19	// "zf" define a fold
+#define OP_FOLDOPEN	20	// "zo" open folds
+#define OP_FOLDOPENREC	21	// "zO" open folds recursively
+#define OP_FOLDCLOSE	22	// "zc" close folds
+#define OP_FOLDCLOSEREC	23	// "zC" close folds recursively
+#define OP_FOLDDEL	24	// "zd" delete folds
+#define OP_FOLDDELREC	25	// "zD" delete folds recursively
+#define OP_FORMAT2	26	// "gw" format operator, keeps cursor pos
+#define OP_FUNCTION	27	// "g@" call 'operatorfunc'
+#define OP_NR_ADD	28	// "<C-A>" Add to the number or alphabetic
+				// character (OP_ADD conflicts with Perl)
+#define OP_NR_SUB	29	// "<C-X>" Subtract from the number or
+				// alphabetic character
 
 /*
  * Motion types, used for operators and for yank/delete registers.
  */
-#define MCHAR	0		/* character-wise movement/register */
-#define MLINE	1		/* line-wise movement/register */
-#define MBLOCK	2		/* block-wise register */
+#define MCHAR	0		// character-wise movement/register
+#define MLINE	1		// line-wise movement/register
+#define MBLOCK	2		// block-wise register
 
-#define MAUTO	0xff		/* Decide between MLINE/MCHAR */
+#define MAUTO	0xff		// Decide between MLINE/MCHAR
 
 /*
  * Minimum screen size
  */
-#define MIN_COLUMNS	12	/* minimal columns for screen */
-#define MIN_LINES	2	/* minimal lines for screen */
-#define STATUS_HEIGHT	1	/* height of a status line under a window */
-#ifdef FEAT_MENU		/* height of a status line under a window */
+#define MIN_COLUMNS	12	// minimal columns for screen
+#define MIN_LINES	2	// minimal lines for screen
+#define STATUS_HEIGHT	1	// height of a status line under a window
+#ifdef FEAT_MENU		// height of a status line under a window
 # define WINBAR_HEIGHT(wp)	(wp)->w_winbar_height
 # define VISIBLE_HEIGHT(wp)	((wp)->w_height + (wp)->w_winbar_height)
 #else
 # define WINBAR_HEIGHT(wp)	0
 # define VISIBLE_HEIGHT(wp)	(wp)->w_height
 #endif
-#define QF_WINHEIGHT	10	/* default height for quickfix window */
+#define QF_WINHEIGHT	10	// default height for quickfix window
 
 /*
  * Buffer sizes
  */
 #ifndef CMDBUFFSIZE
-# define CMDBUFFSIZE	256	/* size of the command processing buffer */
+# define CMDBUFFSIZE	256	// size of the command processing buffer
 #endif
 
-#define LSIZE	    512		/* max. size of a line in the tags file */
+#define LSIZE	    512		// max. size of a line in the tags file
 
-#define IOSIZE	   (1024+1)	/* file i/o and sprintf buffer size */
+#define IOSIZE	   (1024+1)	// file i/o and sprintf buffer size
 
-#define DIALOG_MSG_SIZE 1000	/* buffer size for dialog_msg() */
+#define DIALOG_MSG_SIZE 1000	// buffer size for dialog_msg()
 
-#define MSG_BUF_LEN 480	/* length of buffer for small messages */
-#define MSG_BUF_CLEN  (MSG_BUF_LEN / 6)    /* cell length (worst case: utf-8
-					       takes 6 bytes for one cell) */
+#define MSG_BUF_LEN 480	// length of buffer for small messages
+#define MSG_BUF_CLEN  (MSG_BUF_LEN / 6)    // cell length (worst case: utf-8
+					   // takes 6 bytes for one cell)
 
-#define FOLD_TEXT_LEN  51	/* buffer size for get_foldtext() */
+#define FOLD_TEXT_LEN  51	// buffer size for get_foldtext()
 
-/* Size of the buffer used for tgetent().  Unfortunately this is largely
- * undocumented, some systems use 1024.  Using a buffer that is too small
- * causes a buffer overrun and a crash.  Use the maximum known value to stay
- * on the safe side. */
-#define TBUFSZ 2048		/* buffer size for termcap entry */
+// Size of the buffer used for tgetent().  Unfortunately this is largely
+// undocumented, some systems use 1024.  Using a buffer that is too small
+// causes a buffer overrun and a crash.  Use the maximum known value to stay
+// on the safe side.
+#define TBUFSZ 2048		// buffer size for termcap entry
 
 /*
  * Maximum length of key sequence to be mapped.
@@ -1526,7 +1522,7 @@
  */
 #define MAXMAPLEN   50
 
-/* Size in bytes of the hash used in the undo file. */
+// Size in bytes of the hash used in the undo file.
 #define UNDO_HASH_SIZE 32
 
 #ifdef HAVE_FCNTL_H
@@ -1534,7 +1530,7 @@
 #endif
 
 #ifdef BINARY_FILE_IO
-# define WRITEBIN   "wb"	/* no CR-LF translation */
+# define WRITEBIN   "wb"	// no CR-LF translation
 # define READBIN    "rb"
 # define APPENDBIN  "ab"
 #else
@@ -1558,10 +1554,10 @@
 #endif
 
 #ifndef W_OK
-# define W_OK 2		/* for systems that don't have W_OK in unistd.h */
+# define W_OK 2		// for systems that don't have W_OK in unistd.h
 #endif
 #ifndef R_OK
-# define R_OK 4		/* for systems that don't have R_OK in unistd.h */
+# define R_OK 4		// for systems that don't have R_OK in unistd.h
 #endif
 
 // Allocate memory for one type and cast the returned pointer to have the
@@ -1593,7 +1589,7 @@
 # endif
 #endif
 
-/* Like strcpy() but allows overlapped source and destination. */
+// Like strcpy() but allows overlapped source and destination.
 #define STRMOVE(d, s)	    mch_memmove((d), (s), STRLEN(s) + 1)
 
 #ifdef HAVE_STRNCASECMP
@@ -1606,11 +1602,11 @@
 # endif
 #endif
 
-/* We need to call mb_stricmp() even when we aren't dealing with a multi-byte
- * encoding because mb_stricmp() takes care of all ascii and non-ascii
- * encodings, including characters with umlauts in latin1, etc., while
- * STRICMP() only handles the system locale version, which often does not
- * handle non-ascii properly. */
+// We need to call mb_stricmp() even when we aren't dealing with a multi-byte
+// encoding because mb_stricmp() takes care of all ascii and non-ascii
+// encodings, including characters with umlauts in latin1, etc., while
+// STRICMP() only handles the system locale version, which often does not
+// handle non-ascii properly.
 
 # define MB_STRICMP(d, s)	mb_strnicmp((char_u *)(d), (char_u *)(s), (int)MAXCOL)
 # define MB_STRNICMP(d, s, n)	mb_strnicmp((char_u *)(d), (char_u *)(s), (int)(n))
@@ -1660,17 +1656,17 @@
 # define GUI_GET_COLOR		    GUI_FUNCTION(get_color)
 #endif
 
-/* Prefer using emsgf(), because perror() may send the output to the wrong
- * destination and mess up the screen. */
+// Prefer using emsgf(), because perror() may send the output to the wrong
+// destination and mess up the screen.
 #ifdef HAVE_STRERROR
 # define PERROR(msg)		    (void)semsg("%s: %s", (char *)msg, strerror(errno))
 #else
 # define PERROR(msg)		    do_perror(msg)
 #endif
 
-typedef long	linenr_T;		/* line number type */
-typedef int	colnr_T;		/* column number type */
-typedef unsigned short disptick_T;	/* display tick type */
+typedef long	linenr_T;		// line number type
+typedef int	colnr_T;		// column number type
+typedef unsigned short disptick_T;	// display tick type
 
 /*
  * Well, you won't believe it, but some S/390 machines ("host", now also known
@@ -1724,8 +1720,8 @@
 #endif
 
 #ifdef MSWIN
-/* On MS-Windows the third argument isn't size_t.  This matters for Win64,
- * where sizeof(size_t)==8, not 4 */
+// On MS-Windows the third argument isn't size_t.  This matters for Win64,
+// where sizeof(size_t)==8, not 4
 # define vim_read(fd, buf, count)   read((fd), (char *)(buf), (unsigned int)(count))
 # define vim_write(fd, buf, count)  write((fd), (char *)(buf), (unsigned int)(count))
 #else
@@ -1754,11 +1750,11 @@
 # endif
 #endif
 
-#define MAX_MCO	6	/* maximum value for 'maxcombine' */
+#define MAX_MCO	6	// maximum value for 'maxcombine'
 
-/* Maximum number of bytes in a multi-byte character.  It can be one 32-bit
- * character of up to 6 bytes, or one 16-bit character of up to three bytes
- * plus six following composing characters of three bytes each. */
+// Maximum number of bytes in a multi-byte character.  It can be one 32-bit
+// character of up to 6 bytes, or one 16-bit character of up to three bytes
+// plus six following composing characters of three bytes each.
 #define MB_MAXBYTES	21
 
 #if (defined(FEAT_PROFILE) || defined(FEAT_RELTIME)) && !defined(PROTO)
@@ -1768,7 +1764,7 @@
 typedef struct timeval proftime_T;
 # endif
 #else
-typedef int proftime_T;	    /* dummy for function prototypes */
+typedef int proftime_T;	    // dummy for function prototypes
 #endif
 
 /*
@@ -1792,55 +1788,55 @@
 typedef int sock_T;
 #endif
 
-/* Include option.h before structs.h, because the number of window-local and
- * buffer-local options is used there. */
-#include "option.h"	/* options and default values */
+// Include option.h before structs.h, because the number of window-local and
+// buffer-local options is used there.
+#include "option.h"	// options and default values
 
-#include "beval.h"	/* BalloonEval */
+#include "beval.h"	// BalloonEval
 
-/* Note that gui.h is included by structs.h */
+// Note that gui.h is included by structs.h
 
-#include "structs.h"	/* defines many structures */
+#include "structs.h"	// defines many structures
 
 #include "alloc.h"
 
-/* Values for "do_profiling". */
-#define PROF_NONE	0	/* profiling not started */
-#define PROF_YES	1	/* profiling busy */
-#define PROF_PAUSED	2	/* profiling paused */
+// Values for "do_profiling".
+#define PROF_NONE	0	// profiling not started
+#define PROF_YES	1	// profiling busy
+#define PROF_PAUSED	2	// profiling paused
 
 #ifdef FEAT_MOUSE
 
-/* Codes for mouse button events in lower three bits: */
+// Codes for mouse button events in lower three bits:
 # define MOUSE_LEFT	0x00
 # define MOUSE_MIDDLE	0x01
 # define MOUSE_RIGHT	0x02
 # define MOUSE_RELEASE	0x03
 
-/* bit masks for modifiers: */
+// bit masks for modifiers:
 # define MOUSE_SHIFT	0x04
 # define MOUSE_ALT	0x08
 # define MOUSE_CTRL	0x10
 
-/* mouse buttons that are handled like a key press (GUI only) */
-/* Note that the scroll wheel keys are inverted: MOUSE_5 scrolls lines up but
- * the result of this is that the window moves down, similarly MOUSE_6 scrolls
- * columns left but the window moves right. */
-# define MOUSE_4	0x100	/* scroll wheel down */
-# define MOUSE_5	0x200	/* scroll wheel up */
+// mouse buttons that are handled like a key press (GUI only)
+// Note that the scroll wheel keys are inverted: MOUSE_5 scrolls lines up but
+// the result of this is that the window moves down, similarly MOUSE_6 scrolls
+// columns left but the window moves right.
+# define MOUSE_4	0x100	// scroll wheel down
+# define MOUSE_5	0x200	// scroll wheel up
 
-# define MOUSE_X1	0x300 /* Mouse-button X1 (6th) */
-# define MOUSE_X2	0x400 /* Mouse-button X2 */
+# define MOUSE_X1	0x300 // Mouse-button X1 (6th)
+# define MOUSE_X2	0x400 // Mouse-button X2
 
-# define MOUSE_6	0x500	/* scroll wheel left */
-# define MOUSE_7	0x600	/* scroll wheel right */
+# define MOUSE_6	0x500	// scroll wheel left
+# define MOUSE_7	0x600	// scroll wheel right
 
-/* 0x20 is reserved by xterm */
+// 0x20 is reserved by xterm
 # define MOUSE_DRAG_XTERM   0x40
 
 # define MOUSE_DRAG	(0x40 | MOUSE_RELEASE)
 
-/* Lowest button code for using the mouse wheel (xterm only) */
+// Lowest button code for using the mouse wheel (xterm only)
 # define MOUSEWHEEL_LOW		0x60
 
 # define MOUSE_CLICK_MASK	0x03
@@ -1851,9 +1847,9 @@
 # define SET_NUM_MOUSE_CLICKS(code, num) \
     (code) = ((code) & 0x3f) | ((((num) - 1) & 3) << 6)
 
-/* Added to mouse column for GUI when 'mousefocus' wants to give focus to a
- * window by simulating a click on its status line.  We could use up to 128 *
- * 128 = 16384 columns, now it's reduced to 10000. */
+// Added to mouse column for GUI when 'mousefocus' wants to give focus to a
+// window by simulating a click on its status line.  We could use up to 128 *
+// 128 = 16384 columns, now it's reduced to 10000.
 # define MOUSE_COLOFF 10000
 
 /*
@@ -1862,33 +1858,33 @@
  */
 # define IN_UNKNOWN		0
 # define IN_BUFFER		1
-# define IN_STATUS_LINE		2	/* on status or command line */
-# define IN_SEP_LINE		4	/* on vertical separator line */
-# define IN_OTHER_WIN		8	/* in other window but can't go there */
+# define IN_STATUS_LINE		2	// on status or command line
+# define IN_SEP_LINE		4	// on vertical separator line
+# define IN_OTHER_WIN		8	// in other window but can't go there
 # define CURSOR_MOVED		0x100
-# define MOUSE_FOLD_CLOSE	0x200	/* clicked on '-' in fold column */
-# define MOUSE_FOLD_OPEN	0x400	/* clicked on '+' in fold column */
-# define MOUSE_WINBAR		0x800	/* in window toolbar */
+# define MOUSE_FOLD_CLOSE	0x200	// clicked on '-' in fold column
+# define MOUSE_FOLD_OPEN	0x400	// clicked on '+' in fold column
+# define MOUSE_WINBAR		0x800	// in window toolbar
 
-/* flags for jump_to_mouse() */
-# define MOUSE_FOCUS		0x01	/* need to stay in this window */
-# define MOUSE_MAY_VIS		0x02	/* may start Visual mode */
-# define MOUSE_DID_MOVE		0x04	/* only act when mouse has moved */
-# define MOUSE_SETPOS		0x08	/* only set current mouse position */
-# define MOUSE_MAY_STOP_VIS	0x10	/* may stop Visual mode */
-# define MOUSE_RELEASED		0x20	/* button was released */
+// flags for jump_to_mouse()
+# define MOUSE_FOCUS		0x01	// need to stay in this window
+# define MOUSE_MAY_VIS		0x02	// may start Visual mode
+# define MOUSE_DID_MOVE		0x04	// only act when mouse has moved
+# define MOUSE_SETPOS		0x08	// only set current mouse position
+# define MOUSE_MAY_STOP_VIS	0x10	// may stop Visual mode
+# define MOUSE_RELEASED		0x20	// button was released
 
 # if defined(UNIX) && defined(HAVE_GETTIMEOFDAY) && defined(HAVE_SYS_TIME_H)
-#  define CHECK_DOUBLE_CLICK 1	/* Checking for double clicks ourselves. */
+#  define CHECK_DOUBLE_CLICK 1	// Checking for double clicks ourselves.
 # endif
 
-#endif /* FEAT_MOUSE */
+#endif // FEAT_MOUSE
 
-/* defines for eval_vars() */
+// defines for eval_vars()
 #define VALID_PATH		1
 #define VALID_HEAD		2
 
-/* Defines for Vim variables.  These must match vimvars[] in eval.c! */
+// Defines for Vim variables.  These must match vimvars[] in eval.c!
 #define VV_COUNT	0
 #define VV_COUNT1	1
 #define VV_PREVCOUNT	2
@@ -2003,17 +1999,17 @@
 #define VAR_TYPE_CHANNEL    9
 #define VAR_TYPE_BLOB	    10
 
-#define DICT_MAXNEST 100	/* maximum nesting of lists and dicts */
+#define DICT_MAXNEST 100	// maximum nesting of lists and dicts
 
 #ifdef FEAT_CLIPBOARD
 
-/* VIM_ATOM_NAME is the older Vim-specific selection type for X11.  Still
- * supported for when a mix of Vim versions is used. VIMENC_ATOM_NAME includes
- * the encoding to support Vims using different 'encoding' values. */
+// VIM_ATOM_NAME is the older Vim-specific selection type for X11.  Still
+// supported for when a mix of Vim versions is used. VIMENC_ATOM_NAME includes
+// the encoding to support Vims using different 'encoding' values.
 # define VIM_ATOM_NAME "_VIM_TEXT"
 # define VIMENC_ATOM_NAME "_VIMENC_TEXT"
 
-/* Selection states for modeless selection */
+// Selection states for modeless selection
 # define SELECT_CLEARED		0
 # define SELECT_IN_PROGRESS	1
 # define SELECT_DONE		2
@@ -2028,7 +2024,7 @@
 #  endif
 # endif
 
-/* Info about selected text */
+// Info about selected text
 typedef struct
 {
     int		available;	// Is clipboard available?
@@ -2072,7 +2068,7 @@
 typedef int Clipboard_T;	// This is required for the prototypes.
 #endif
 
-/* Use 64-bit stat structure if available. */
+// Use 64-bit stat structure if available.
 #if (defined(_MSC_VER) && (_MSC_VER >= 1300)) || defined(__MINGW32__)
 # define HAVE_STAT64
 typedef struct _stat64 stat_T;
@@ -2093,12 +2089,12 @@
     ASSERT_OTHER
 } assert_type_T;
 
-/* Mode for bracketed_paste(). */
+// Mode for bracketed_paste().
 typedef enum {
-    PASTE_INSERT,	/* insert mode */
-    PASTE_CMDLINE,	/* command line */
-    PASTE_EX,		/* ex mode line */
-    PASTE_ONE_CHAR	/* return first character */
+    PASTE_INSERT,	// insert mode
+    PASTE_CMDLINE,	// command line
+    PASTE_EX,		// ex mode line
+    PASTE_ONE_CHAR	// return first character
 } paste_mode_T;
 
 // Argument for flush_buffers().
@@ -2108,15 +2104,15 @@
     FLUSH_INPUT		// flush typebuf and inchar() input
 } flush_buffers_T;
 
-#include "ex_cmds.h"	    /* Ex command defines */
-#include "spell.h"	    /* spell checking stuff */
+#include "ex_cmds.h"	    // Ex command defines
+#include "spell.h"	    // spell checking stuff
 
-#include "proto.h"	    /* function prototypes */
+#include "proto.h"	    // function prototypes
 
-/* This has to go after the include of proto.h, as proto/gui.pro declares
- * functions of these names. The declarations would break if the defines had
- * been seen at that stage.  But it must be before globals.h, where error_ga
- * is declared. */
+// This has to go after the include of proto.h, as proto/gui.pro declares
+// functions of these names. The declarations would break if the defines had
+// been seen at that stage.  But it must be before globals.h, where error_ga
+// is declared.
 #if !defined(MSWIN) && !defined(FEAT_GUI_X11) \
 	&& !defined(FEAT_GUI_GTK) && !defined(FEAT_GUI_MAC) && !defined(PROTO)
 # define mch_errmsg(str)	fprintf(stderr, "%s", (str))
@@ -2130,10 +2126,10 @@
 	&& (!defined(FEAT_GUI_MSWIN) \
 	     || !(defined(FEAT_MBYTE_IME) || defined(GLOBAL_IME))) \
 	&& !(defined(FEAT_GUI_MAC) && defined(MACOS_CONVERT))
-/* Whether IME is supported by im_get_status() defined in mbyte.c.
- * For Win32 GUI it's in gui_w32.c when FEAT_MBYTE_IME or GLOBAL_IME is defined.
- * for Mac it is in gui_mac.c for the GUI or in os_mac_conv.c when
- * MACOS_CONVERT is defined. */
+// Whether IME is supported by im_get_status() defined in mbyte.c.
+// For Win32 GUI it's in gui_w32.c when FEAT_MBYTE_IME or GLOBAL_IME is defined.
+// for Mac it is in gui_mac.c for the GUI or in os_mac_conv.c when
+// MACOS_CONVERT is defined.
 # define IME_WITHOUT_XIM
 #endif
 
@@ -2142,23 +2138,23 @@
 	|| (defined(FEAT_GUI_MSWIN) \
 	    && (defined(FEAT_MBYTE_IME) || defined(GLOBAL_IME))) \
 	|| defined(FEAT_GUI_MAC)
-/* im_set_active() is available */
+// im_set_active() is available
 # define HAVE_INPUT_METHOD
 #endif
 
 #ifndef FEAT_LINEBREAK
-/* Without the 'numberwidth' option line numbers are always 7 chars. */
+// Without the 'numberwidth' option line numbers are always 7 chars.
 # define number_width(x) 7
 #endif
 
-/* This must come after including proto.h.
- * For VMS this is defined in macros.h. */
+// This must come after including proto.h.
+// For VMS this is defined in macros.h.
 #if !defined(MSWIN) && !defined(VMS)
 # define mch_open(n, m, p)	open((n), (m), (p))
 # define mch_fopen(n, p)	fopen((n), (p))
 #endif
 
-#include "globals.h"	    /* global variables and messages */
+#include "globals.h"	    // global variables and messages
 
 /*
  * If console dialog not supported, but GUI dialog is, use the GUI one.
@@ -2188,30 +2184,30 @@
 #  define BROWSE_FILTER_DEFAULT \
 	(char_u *)N_("All Files (*)\t*\nC source (*.c, *.h)\t*.c;*.h\nC++ source (*.cpp, *.hpp)\t*.cpp;*.hpp\nVim files (*.vim, _vimrc, _gvimrc)\t*.vim;_vimrc;_gvimrc\n")
 # endif
-# define BROWSE_SAVE 1	    /* flag for do_browse() */
-# define BROWSE_DIR 2	    /* flag for do_browse() */
+# define BROWSE_SAVE 1	    // flag for do_browse()
+# define BROWSE_DIR 2	    // flag for do_browse()
 #endif
 
 #ifdef _MSC_VER
-/* Avoid useless warning "conversion from X to Y of greater size". */
+// Avoid useless warning "conversion from X to Y of greater size".
  #pragma warning(disable : 4312)
-/* Avoid warning for old style function declarators */
+// Avoid warning for old style function declarators
  #pragma warning(disable : 4131)
-/* Avoid warning for conversion to type with smaller range */
+// Avoid warning for conversion to type with smaller range
  #pragma warning(disable : 4244)
-/* Avoid warning for conversion to larger size */
+// Avoid warning for conversion to larger size
  #pragma warning(disable : 4306)
-/* Avoid warning for unreferenced formal parameter */
+// Avoid warning for unreferenced formal parameter
  #pragma warning(disable : 4100)
-/* Avoid warning for differs in indirection to slightly different base type */
+// Avoid warning for differs in indirection to slightly different base type
  #pragma warning(disable : 4057)
-/* Avoid warning for constant conditional expression */
+// Avoid warning for constant conditional expression
  #pragma warning(disable : 4127)
-/* Avoid warning for assignment within conditional */
+// Avoid warning for assignment within conditional
  #pragma warning(disable : 4706)
 #endif
 
-/* Note: a NULL argument for vim_realloc() is not portable, don't use it. */
+// Note: a NULL argument for vim_realloc() is not portable, don't use it.
 #if defined(MEM_PROFILE)
 # define vim_realloc(ptr, size)  mem_realloc((ptr), (size))
 #else
@@ -2227,28 +2223,28 @@
 #define MB_BYTE2LEN(b)		mb_bytelen_tab[b]
 #define MB_BYTE2LEN_CHECK(b)	(((b) < 0 || (b) > 255) ? 1 : mb_bytelen_tab[b])
 
-/* properties used in enc_canon_table[] (first three mutually exclusive) */
+// properties used in enc_canon_table[] (first three mutually exclusive)
 #define ENC_8BIT	0x01
 #define ENC_DBCS	0x02
 #define ENC_UNICODE	0x04
 
-#define ENC_ENDIAN_B	0x10	    /* Unicode: Big endian */
-#define ENC_ENDIAN_L	0x20	    /* Unicode: Little endian */
+#define ENC_ENDIAN_B	0x10	    // Unicode: Big endian
+#define ENC_ENDIAN_L	0x20	    // Unicode: Little endian
 
-#define ENC_2BYTE	0x40	    /* Unicode: UCS-2 */
-#define ENC_4BYTE	0x80	    /* Unicode: UCS-4 */
-#define ENC_2WORD	0x100	    /* Unicode: UTF-16 */
+#define ENC_2BYTE	0x40	    // Unicode: UCS-2
+#define ENC_4BYTE	0x80	    // Unicode: UCS-4
+#define ENC_2WORD	0x100	    // Unicode: UTF-16
 
-#define ENC_LATIN1	0x200	    /* Latin1 */
-#define ENC_LATIN9	0x400	    /* Latin9 */
-#define ENC_MACROMAN	0x800	    /* Mac Roman (not Macro Man! :-) */
+#define ENC_LATIN1	0x200	    // Latin1
+#define ENC_LATIN9	0x400	    // Latin9
+#define ENC_MACROMAN	0x800	    // Mac Roman (not Macro Man! :-)
 
 #ifdef USE_ICONV
 # ifndef EILSEQ
 #  define EILSEQ 123
 # endif
 # ifdef DYNAMIC_ICONV
-/* On Win32 iconv.dll is dynamically loaded. */
+// On Win32 iconv.dll is dynamically loaded.
 #  define ICONV_ERRNO (*iconv_errno())
 #  define ICONV_E2BIG  7
 #  define ICONV_EINVAL 22
@@ -2261,18 +2257,18 @@
 # endif
 #endif
 
-#define SIGN_BYTE 1	    /* byte value used where sign is displayed;
-			       attribute value is sign type */
+#define SIGN_BYTE 1	    // byte value used where sign is displayed;
+			    // attribute value is sign type
 
 #ifdef FEAT_NETBEANS_INTG
-# define MULTISIGN_BYTE 2   /* byte value used where sign is displayed if
-			       multiple signs exist on the line */
+# define MULTISIGN_BYTE 2   // byte value used where sign is displayed if
+			    // multiple signs exist on the line
 #endif
 
 #if defined(FEAT_GUI) && defined(FEAT_XCLIPBOARD)
 # ifdef FEAT_GUI_GTK
-   /* Avoid using a global variable for the X display.  It's ugly
-    * and is likely to cause trouble in multihead environments. */
+   // Avoid using a global variable for the X display.  It's ugly
+   // and is likely to cause trouble in multihead environments.
 #  define X_DISPLAY	((gui.in_use) ? gui_mch_get_display() : xterm_dpy)
 # else
 #  define X_DISPLAY	(gui.in_use ? gui.dpy : xterm_dpy)
@@ -2353,7 +2349,7 @@
 #ifndef FEAT_NETBEANS_INTG
 # undef NBDEBUG
 #endif
-#ifdef NBDEBUG /* Netbeans debugging. */
+#ifdef NBDEBUG // Netbeans debugging.
 # include "nbdebug.h"
 #else
 # define nbdebug(a)
@@ -2368,14 +2364,14 @@
 # undef FF
 # undef OP_DELETE
 # undef OP_JOIN
-  /* remove MAX and MIN, included by glib.h, redefined by sys/param.h */
+  // remove MAX and MIN, included by glib.h, redefined by sys/param.h
 # ifdef MAX
 #  undef MAX
 # endif
 # ifdef MIN
 #  undef MIN
 # endif
-  /* We use _() for gettext(), Perl uses it for function prototypes... */
+  // We use _() for gettext(), Perl uses it for function prototypes...
 # ifdef _
 #  undef _
 # endif
@@ -2388,8 +2384,8 @@
 # ifdef instr
 #  undef instr
 # endif
-  /* bool may cause trouble on some old versions of Mac OS X but is required
-   * on a few other systems and for Perl */
+  // bool may cause trouble on some old versions of Mac OS X but is required
+  // on a few other systems and for Perl
 # if (defined(MACOS_X) && !defined(MAC_OS_X_VERSION_10_6)) \
 				       && defined(bool) && !defined(FEAT_PERL)
 #  undef bool
@@ -2397,74 +2393,74 @@
 
 #endif
 
-/* values for vim_handle_signal() that are not a signal */
+// values for vim_handle_signal() that are not a signal
 #define SIGNAL_BLOCK	-1
 #define SIGNAL_UNBLOCK  -2
 #if !defined(UNIX) && !defined(VMS)
 # define vim_handle_signal(x) 0
 #endif
 
-/* flags for skip_vimgrep_pat() */
+// flags for skip_vimgrep_pat()
 #define VGR_GLOBAL	1
 #define VGR_NOJUMP	2
 
-/* behavior for bad character, "++bad=" argument */
-#define BAD_REPLACE	'?'	/* replace it with '?' (default) */
-#define BAD_KEEP	-1	/* leave it */
-#define BAD_DROP	-2	/* erase it */
+// behavior for bad character, "++bad=" argument
+#define BAD_REPLACE	'?'	// replace it with '?' (default)
+#define BAD_KEEP	-1	// leave it
+#define BAD_DROP	-2	// erase it
 
-/* last argument for do_source() */
+// last argument for do_source()
 #define DOSO_NONE	0
-#define DOSO_VIMRC	1	/* loading vimrc file */
-#define DOSO_GVIMRC	2	/* loading gvimrc file */
+#define DOSO_VIMRC	1	// loading vimrc file
+#define DOSO_GVIMRC	2	// loading gvimrc file
 
-/* flags for read_viminfo() and children */
-#define VIF_WANT_INFO		1	/* load non-mark info */
-#define VIF_WANT_MARKS		2	/* load file marks */
-#define VIF_FORCEIT		4	/* overwrite info already read */
-#define VIF_GET_OLDFILES	8	/* load v:oldfiles */
+// flags for read_viminfo() and children
+#define VIF_WANT_INFO		1	// load non-mark info
+#define VIF_WANT_MARKS		2	// load file marks
+#define VIF_FORCEIT		4	// overwrite info already read
+#define VIF_GET_OLDFILES	8	// load v:oldfiles
 
-/* flags for buf_freeall() */
-#define BFA_DEL		1	/* buffer is going to be deleted */
-#define BFA_WIPE	2	/* buffer is going to be wiped out */
-#define BFA_KEEP_UNDO	4	/* do not free undo information */
+// flags for buf_freeall()
+#define BFA_DEL		1	// buffer is going to be deleted
+#define BFA_WIPE	2	// buffer is going to be wiped out
+#define BFA_KEEP_UNDO	4	// do not free undo information
 
-/* direction for nv_mousescroll() and ins_mousescroll() */
-#define MSCR_DOWN	0	/* DOWN must be FALSE */
+// direction for nv_mousescroll() and ins_mousescroll()
+#define MSCR_DOWN	0	// DOWN must be FALSE
 #define MSCR_UP		1
 #define MSCR_LEFT	-1
 #define MSCR_RIGHT	-2
 
-#define KEYLEN_PART_KEY -1	/* keylen value for incomplete key-code */
-#define KEYLEN_PART_MAP -2	/* keylen value for incomplete mapping */
-#define KEYLEN_REMOVED  9999	/* keylen value for removed sequence */
+#define KEYLEN_PART_KEY -1	// keylen value for incomplete key-code
+#define KEYLEN_PART_MAP -2	// keylen value for incomplete mapping
+#define KEYLEN_REMOVED  9999	// keylen value for removed sequence
 
-/* Return values from win32_fileinfo(). */
+// Return values from win32_fileinfo().
 #define FILEINFO_OK	     0
-#define FILEINFO_ENC_FAIL    1	/* enc_to_utf16() failed */
-#define FILEINFO_READ_FAIL   2	/* CreateFile() failed */
-#define FILEINFO_INFO_FAIL   3	/* GetFileInformationByHandle() failed */
+#define FILEINFO_ENC_FAIL    1	// enc_to_utf16() failed
+#define FILEINFO_READ_FAIL   2	// CreateFile() failed
+#define FILEINFO_INFO_FAIL   3	// GetFileInformationByHandle() failed
 
-/* Return value from get_option_value_strict */
-#define SOPT_BOOL	0x01	/* Boolean option */
-#define SOPT_NUM	0x02	/* Number option */
-#define SOPT_STRING	0x04	/* String option */
-#define SOPT_GLOBAL	0x08	/* Option has global value */
-#define SOPT_WIN	0x10	/* Option has window-local value */
-#define SOPT_BUF	0x20	/* Option has buffer-local value */
-#define SOPT_UNSET	0x40	/* Option does not have local value set */
+// Return value from get_option_value_strict
+#define SOPT_BOOL	0x01	// Boolean option
+#define SOPT_NUM	0x02	// Number option
+#define SOPT_STRING	0x04	// String option
+#define SOPT_GLOBAL	0x08	// Option has global value
+#define SOPT_WIN	0x10	// Option has window-local value
+#define SOPT_BUF	0x20	// Option has buffer-local value
+#define SOPT_UNSET	0x40	// Option does not have local value set
 
-/* Option types for various functions in option.c */
-#define SREQ_GLOBAL	0	/* Request global option */
-#define SREQ_WIN	1	/* Request window-local option */
-#define SREQ_BUF	2	/* Request buffer-local option */
+// Option types for various functions in option.c
+#define SREQ_GLOBAL	0	// Request global option
+#define SREQ_WIN	1	// Request window-local option
+#define SREQ_BUF	2	// Request buffer-local option
 
-/* Flags for get_reg_contents */
-#define GREG_NO_EXPR	1	/* Do not allow expression register */
-#define GREG_EXPR_SRC	2	/* Return expression itself for "=" register */
-#define GREG_LIST	4	/* Return list */
+// Flags for get_reg_contents
+#define GREG_NO_EXPR	1	// Do not allow expression register
+#define GREG_EXPR_SRC	2	// Return expression itself for "=" register
+#define GREG_LIST	4	// Return list
 
-/* Character used as separated in autoload function/variable names. */
+// Character used as separated in autoload function/variable names.
 #define AUTOLOAD_CHAR '#'
 
 #ifdef FEAT_JOB_CHANNEL
@@ -2477,44 +2473,44 @@
 # define MAX_NAMED_PIPE_SIZE 65535
 #endif
 
-/* Options for json_encode() and json_decode. */
-#define JSON_JS		1   /* use JS instead of JSON */
-#define JSON_NO_NONE	2   /* v:none item not allowed */
-#define JSON_NL		4   /* append a NL */
+// Options for json_encode() and json_decode.
+#define JSON_JS		1   // use JS instead of JSON
+#define JSON_NO_NONE	2   // v:none item not allowed
+#define JSON_NL		4   // append a NL
 
-/* Used for flags of do_in_path() */
-#define DIP_ALL	    0x01	/* all matches, not just the first one */
-#define DIP_DIR	    0x02	/* find directories instead of files. */
-#define DIP_ERR	    0x04	/* give an error message when none found. */
-#define DIP_START   0x08	/* also use "start" directory in 'packpath' */
-#define DIP_OPT	    0x10	/* also use "opt" directory in 'packpath' */
-#define DIP_NORTP   0x20	/* do not use 'runtimepath' */
-#define DIP_NOAFTER 0x40	/* skip "after" directories */
-#define DIP_AFTER   0x80	/* only use "after" directories */
+// Used for flags of do_in_path()
+#define DIP_ALL	    0x01	// all matches, not just the first one
+#define DIP_DIR	    0x02	// find directories instead of files.
+#define DIP_ERR	    0x04	// give an error message when none found.
+#define DIP_START   0x08	// also use "start" directory in 'packpath'
+#define DIP_OPT	    0x10	// also use "opt" directory in 'packpath'
+#define DIP_NORTP   0x20	// do not use 'runtimepath'
+#define DIP_NOAFTER 0x40	// skip "after" directories
+#define DIP_AFTER   0x80	// only use "after" directories
 
-/* Lowest number used for window ID. Cannot have this many windows. */
+// Lowest number used for window ID. Cannot have this many windows.
 #define LOWEST_WIN_ID 1000
 
-/* Used by the garbage collector. */
+// Used by the garbage collector.
 #define COPYID_INC 2
 #define COPYID_MASK (~0x1)
 
-/* Values for trans_function_name() argument: */
-#define TFN_INT		1	/* internal function name OK */
-#define TFN_QUIET	2	/* no error messages */
-#define TFN_NO_AUTOLOAD	4	/* do not use script autoloading */
-#define TFN_NO_DEREF	8	/* do not dereference a Funcref */
-#define TFN_READ_ONLY	16	/* will not change the var */
+// Values for trans_function_name() argument:
+#define TFN_INT		1	// internal function name OK
+#define TFN_QUIET	2	// no error messages
+#define TFN_NO_AUTOLOAD	4	// do not use script autoloading
+#define TFN_NO_DEREF	8	// do not dereference a Funcref
+#define TFN_READ_ONLY	16	// will not change the var
 
-/* Values for get_lval() flags argument: */
-#define GLV_QUIET	TFN_QUIET	/* no error messages */
-#define GLV_NO_AUTOLOAD	TFN_NO_AUTOLOAD	/* do not use script autoloading */
-#define GLV_READ_ONLY	TFN_READ_ONLY	/* will not change the var */
+// Values for get_lval() flags argument:
+#define GLV_QUIET	TFN_QUIET	// no error messages
+#define GLV_NO_AUTOLOAD	TFN_NO_AUTOLOAD	// do not use script autoloading
+#define GLV_READ_ONLY	TFN_READ_ONLY	// will not change the var
 
-#define DO_NOT_FREE_CNT 99999	/* refcount for dict or list that should not
-				   be freed. */
+#define DO_NOT_FREE_CNT 99999	// refcount for dict or list that should not
+				// be freed.
 
-/* errors for when calling a function */
+// errors for when calling a function
 #define ERROR_UNKNOWN	0
 #define ERROR_TOOMANY	1
 #define ERROR_TOOFEW	2
@@ -2525,17 +2521,17 @@
 #define ERROR_DELETED	7
 #define ERROR_NOTMETHOD	8   // function cannot be used as a method
 
-/* flags for find_name_end() */
-#define FNE_INCL_BR	1	/* include [] in name */
-#define FNE_CHECK_START	2	/* check name starts with valid character */
+// flags for find_name_end()
+#define FNE_INCL_BR	1	// include [] in name
+#define FNE_CHECK_START	2	// check name starts with valid character
 
-/* BSD is supposed to cover FreeBSD and similar systems. */
+// BSD is supposed to cover FreeBSD and similar systems.
 #if (defined(SUN_SYSTEM) || defined(BSD) || defined(__FreeBSD_kernel__)) \
 	&& (defined(S_ISCHR) || defined(S_IFCHR))
 # define OPEN_CHR_FILES
 #endif
 
-/* stat macros */
+// stat macros
 #ifndef S_ISDIR
 # ifdef S_IFDIR
 #  define S_ISDIR(m)	(((m) & S_IFMT) == S_IFDIR)
@@ -2605,11 +2601,11 @@
 # endif
 #endif
 
-/* Replacement for nchar used by nv_replace(). */
+// Replacement for nchar used by nv_replace().
 #define REPLACE_CR_NCHAR    -1
 #define REPLACE_NL_NCHAR    -2
 
-/* flags for term_start() */
+// flags for term_start()
 #define TERM_START_NOJOB	1
 #define TERM_START_FORCEIT	2
 #define TERM_START_SYSTEM	4
@@ -2625,4 +2621,4 @@
 
 #define CLIP_ZINDEX 32000
 
-#endif /* VIM__H */
+#endif // VIM__H