patch 9.1.0465: missing filecopy() functionv9.1.0465

Problem:  missing filecopy() function
Solution: implement filecopy() Vim script function
          (Shougo Matsushita)

closes: #12346

Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

14 files changed, 198 insertions, 31 deletions

diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 751fbc2156..782c42f74a 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2024 May 25
+*builtin.txt*	For Vim version 9.1.  Last change: 2024 Jun 03
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -178,6 +178,8 @@ extendnew({expr1}, {expr2} [, {expr3}])
 				List/Dict like |extend()| but creates a new
 					List or Dictionary
 feedkeys({string} [, {mode}])	Number	add key sequence to typeahead buffer
+filecopy({from}, {to})		Number	|TRUE| if copying file {from} to {to}
+					worked
 filereadable({file})		Number	|TRUE| if {file} is a readable file
 filewritable({file})		Number	|TRUE| if {file} is a writable file
 filter({expr1}, {expr2})	List/Dict/Blob/String
@@ -2757,6 +2759,18 @@ feedkeys({string} [, {mode}])				*feedkeys()*
 		Can also be used as a |method|: >
 			GetInput()->feedkeys()
 
+filecopy({from}, {to})					*filecopy()*
+		Copy the file pointed to by the name {from} to {to}. The
+		result is a Number, which is |TRUE| if the file was copied
+		successfully, and |FALSE| when it failed.
+		If a file with name {to} already exists, it will fail.
+		Note that it does not handle directories (yet).
+
+		This function is not available in the |sandbox|.
+
+		Can also be used as a |method|: >
+			GetOldName()->filecopy(newname)
+
 filereadable({file})					*filereadable()*
 		The result is a Number, which is |TRUE| when a file with the
 		name {file} exists, and can be read.  If {file} doesn't exist,
diff --git a/runtime/doc/tags b/runtime/doc/tags
index 73aefe1cef..75c27f928d 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -7091,6 +7091,7 @@ file-searching	editing.txt	/*file-searching*
 file-type	filetype.txt	/*file-type*
 file-types	filetype.txt	/*file-types*
 file_readable()	builtin.txt	/*file_readable()*
+filecopy()	builtin.txt	/*filecopy()*
 fileencoding-changed	version6.txt	/*fileencoding-changed*
 filename-backslash	cmdline.txt	/*filename-backslash*
 filename-modifiers	cmdline.txt	/*filename-modifiers*
diff --git a/runtime/doc/todo.txt b/runtime/doc/todo.txt
index 7491b06e0f..c37a1d4bd1 100644
--- a/runtime/doc/todo.txt
+++ b/runtime/doc/todo.txt
@@ -1,4 +1,4 @@
-*todo.txt*      For Vim version 9.1.  Last change: 2024 May 11
+*todo.txt*      For Vim version 9.1.  Last change: 2024 Jun 03
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -82,8 +82,6 @@ With 'smoothscroll' set and "lastline" in 'display', moving the cursor to a
 wrapping line that makes the display scroll up may scroll much more than
 needed, thus jump-scrolling. (part of issue 12411)
 
-Add filecopy() ?  #12346
-
 Implement foreach()  PR  #12166
 
 Errors when running tests with valgrind:
@@ -4242,7 +4240,6 @@ Vim script language:
 	base64enc()		base 64 encoding
 	base64dec()		base 64 decoding
 	attributes()		return file protection flags "drwxrwxrwx"
-	filecopy(from, to)	Copy a file
 	shorten(fname)		shorten a file name, like home_replace()
 	perl(cmd)		call Perl and return string
 	inputrl()		like input() but right-to-left
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 26651ebb16..4225d1f621 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -1,4 +1,4 @@
-*usr_41.txt*	For Vim version 9.1.  Last change: 2024 May 07
+*usr_41.txt*	For Vim version 9.1.  Last change: 2024 Jun 03
 
 		     VIM USER MANUAL - by Bram Moolenaar
 
@@ -993,6 +993,7 @@ System functions and manipulation of files:
 	readdir()		get a List of file names in a directory
 	readdirex()		get a List of file information in a directory
 	writefile()		write a List of lines or Blob into a file
+	filecopy()		copy a file {from} to {to}
 
 Date and Time:				*date-functions* *time-functions*
 	getftime()		get last modification time of a file
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index 3fe8b2dad0..07c416ae28 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -41576,11 +41576,12 @@ Various syntax, indent and other plugins were added.
 Functions: ~
 
 |diff()|		diff two Lists of strings
+|filecopy()|		copy a file {from} to {to}
 |foreach()|		apply function to List items
-|matchbufline()|	all the matches of a pattern in a buffer
-|matchstrlist()|	all the matches of a pattern in a List of strings
 |getregion()|		get a region of text from a buffer
 |getregionpos()|	get a list of positions for a region
+|matchbufline()|	all the matches of a pattern in a buffer
+|matchstrlist()|	all the matches of a pattern in a List of strings
 
 
 Autocommands: ~
@@ -41607,7 +41608,7 @@ Options: ~
 't_CF'			Support for alternate font highlighting terminal code
 
 ==============================================================================
-INCOMPATIBLE CHANGES				*incompatible-9.2*
+INCOMPATIBLE CHANGES					*incompatible-9.2*
 
 Improved/Different MS-Windows mapping support
 |w32-experimental-keycode-trans-strategy|
diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index 5dd678b86a..6ff967756b 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -3,7 +3,7 @@
 " Maintainer:	   Hirohito Higashi <h.east.727 ATMARK gmail.com>
 "	   Doug Kearns <dougkearns@gmail.com>
 " URL:	   https://github.com/vim-jp/syntax-vim-ex
-" Last Change:	   2024 May 27
+" Last Change:	   2024 Jun 03
 " Former Maintainer: Charles E. Campbell
 
 " DO NOT CHANGE DIRECTLY.
@@ -105,13 +105,14 @@ syn case match
 " Function Names {{{2
 " GEN_SYN_VIM: vimFuncName, START_STR='syn keyword vimFuncName contained', END_STR=''
 syn keyword vimFuncName contained abs acos add and append appendbufline argc argidx arglistid argv asin assert_beeps assert_equal assert_equalfile assert_exception assert_fails assert_false assert_inrange assert_match assert_nobeep assert_notequal assert_notmatch assert_report assert_true atan atan2 autocmd_add autocmd_delete autocmd_get balloon_gettext balloon_show balloon_split blob2list browse browsedir bufadd bufexists buflisted bufload bufloaded bufname bufnr bufwinid bufwinnr byte2line byteidx byteidxcomp call ceil ch_canread ch_close ch_close_in ch_evalexpr ch_evalraw ch_getbufnr ch_getjob ch_info ch_log ch_logfile ch_open ch_read ch_readblob ch_readraw ch_sendexpr ch_sendraw ch_setoptions ch_status changenr char2nr charclass charcol charidx chdir cindent
-syn keyword vimFuncName contained clearmatches col complete complete_add complete_check complete_info confirm copy cos cosh count cscope_connection cursor debugbreak deepcopy delete deletebufline did_filetype diff diff_filler diff_hlID digraph_get digraph_getlist digraph_set digraph_setlist echoraw empty environ err_teapot escape eval eventhandler executable execute exepath exists exists_compiled exp expand expandcmd extend extendnew feedkeys filereadable filewritable filter finddir findfile flatten flattennew float2nr floor fmod fnameescape fnamemodify foldclosed foldclosedend foldlevel foldtext foldtextresult foreach foreground fullcommand funcref function garbagecollect get getbufinfo getbufline getbufoneline getbufvar getcellwidths getchangelist getchar getcharmod
-syn keyword vimFuncName contained getcharpos getcharsearch getcharstr getcmdcompltype getcmdline getcmdpos getcmdscreenpos getcmdtype getcmdwintype getcompletion getcurpos getcursorcharpos getcwd getenv getfontname getfperm getfsize getftime getftype getimstatus getjumplist getline getloclist getmarklist getmatches getmousepos getmouseshape getpid getpos getqflist getreg getreginfo getregion getregionpos getregtype getscriptinfo gettabinfo gettabvar gettabwinvar gettagstack gettext getwininfo getwinpos getwinposx getwinposy getwinvar glob glob2regpat globpath has has_key haslocaldir hasmapto histadd histdel histget histnr hlID hlexists hlget hlset hostname iconv indent index indexof input inputdialog inputlist inputrestore inputsave inputsecret insert instanceof
-syn keyword vimFuncName contained interrupt invert isabsolutepath isdirectory isinf islocked isnan items job_getchannel job_info job_setoptions job_start job_status job_stop join js_decode js_encode json_decode json_encode keys keytrans len libcall libcallnr line line2byte lispindent list2blob list2str listener_add listener_flush listener_remove localtime log log10 luaeval map maparg mapcheck maplist mapnew mapset match matchadd matchaddpos matcharg matchbufline matchdelete matchend matchfuzzy matchfuzzypos matchlist matchstr matchstrlist matchstrpos max menu_info min mkdir mode mzeval nextnonblank nr2char or pathshorten perleval popup_atcursor popup_beval popup_clear popup_close popup_create popup_dialog popup_filter_menu popup_filter_yesno popup_findecho popup_findinfo
-syn keyword vimFuncName contained popup_findpreview popup_getoptions popup_getpos popup_hide popup_list popup_locate popup_menu popup_move popup_notification popup_setoptions popup_settext popup_show pow prevnonblank printf prompt_getprompt prompt_setcallback prompt_setinterrupt prompt_setprompt prop_add prop_add_list prop_clear prop_find prop_list prop_remove prop_type_add prop_type_change prop_type_delete prop_type_get prop_type_list pum_getpos pumvisible py3eval pyeval pyxeval rand range readblob readdir readdirex readfile reduce reg_executing reg_recording reltime reltimefloat reltimestr remote_expr remote_foreground remote_peek remote_read remote_send remote_startserver remove rename repeat resolve reverse round rubyeval screenattr screenchar screenchars
-syn keyword vimFuncName contained screencol screenpos screenrow screenstring search searchcount searchdecl searchpair searchpairpos searchpos server2client serverlist setbufline setbufvar setcellwidths setcharpos setcharsearch setcmdline setcmdpos setcursorcharpos setenv setfperm setline setloclist setmatches setpos setqflist setreg settabvar settabwinvar settagstack setwinvar sha256 shellescape shiftwidth sign_define sign_getdefined sign_getplaced sign_jump sign_place sign_placelist sign_undefine sign_unplace sign_unplacelist simplify sin sinh slice sort sound_clear sound_playevent sound_playfile sound_stop soundfold spellbadword spellsuggest split sqrt srand state str2float str2list str2nr strcharlen strcharpart strchars strdisplaywidth strftime strgetchar stridx
-syn keyword vimFuncName contained string strlen strpart strptime strridx strtrans strutf16len strwidth submatch substitute swapfilelist swapinfo swapname synID synIDattr synIDtrans synconcealed synstack system systemlist tabpagebuflist tabpagenr tabpagewinnr tagfiles taglist tan tanh tempname term_dumpdiff term_dumpload term_dumpwrite term_getaltscreen term_getansicolors term_getattr term_getcursor term_getjob term_getline term_getscrolled term_getsize term_getstatus term_gettitle term_gettty term_list term_scrape term_sendkeys term_setansicolors term_setapi term_setkill term_setrestore term_setsize term_start term_wait terminalprops test_alloc_fail test_autochdir test_feedinput test_garbagecollect_now test_garbagecollect_soon test_getvalue test_gui_event test_ignore_error
-syn keyword vimFuncName contained test_mswin_event test_null_blob test_null_channel test_null_dict test_null_function test_null_job test_null_list test_null_partial test_null_string test_option_not_set test_override test_refcount test_setmouse test_settime test_srand_seed test_unknown test_void timer_info timer_pause timer_start timer_stop timer_stopall tolower toupper tr trim trunc type typename undofile undotree uniq utf16idx values virtcol virtcol2col visualmode wildmenumode win_execute win_findbuf win_getid win_gettype win_gotoid win_id2tabwin win_id2win win_move_separator win_move_statusline win_screenpos win_splitmove winbufnr wincol windowsversion winheight winlayout winline winnr winrestcmd winrestview winsaveview winwidth wordcount writefile xor
+syn keyword vimFuncName contained clearmatches col complete complete_add complete_check complete_info confirm copy cos cosh count cscope_connection cursor debugbreak deepcopy delete deletebufline did_filetype diff diff_filler diff_hlID digraph_get digraph_getlist digraph_set digraph_setlist echoraw empty environ err_teapot escape eval eventhandler executable execute exepath exists exists_compiled exp expand expandcmd extend extendnew feedkeys filecopy filereadable filewritable filter finddir findfile flatten flattennew float2nr floor fmod fnameescape fnamemodify foldclosed foldclosedend foldlevel foldtext foldtextresult foreach foreground fullcommand funcref function garbagecollect get getbufinfo getbufline getbufoneline getbufvar getcellwidths getchangelist getchar
+syn keyword vimFuncName contained getcharmod getcharpos getcharsearch getcharstr getcmdcompltype getcmdline getcmdpos getcmdscreenpos getcmdtype getcmdwintype getcompletion getcurpos getcursorcharpos getcwd getenv getfontname getfperm getfsize getftime getftype getimstatus getjumplist getline getloclist getmarklist getmatches getmousepos getmouseshape getpid getpos getqflist getreg getreginfo getregion getregionpos getregtype getscriptinfo gettabinfo gettabvar gettabwinvar gettagstack gettext getwininfo getwinpos getwinposx getwinposy getwinvar glob glob2regpat globpath has has_key haslocaldir hasmapto histadd histdel histget histnr hlID hlexists hlget hlset hostname iconv indent index indexof input inputdialog inputlist inputrestore inputsave inputsecret insert
+syn keyword vimFuncName contained instanceof interrupt invert isabsolutepath isdirectory isinf islocked isnan items job_getchannel job_info job_setoptions job_start job_status job_stop join js_decode js_encode json_decode json_encode keys keytrans len libcall libcallnr line line2byte lispindent list2blob list2str listener_add listener_flush listener_remove localtime log log10 luaeval map maparg mapcheck maplist mapnew mapset match matchadd matchaddpos matcharg matchbufline matchdelete matchend matchfuzzy matchfuzzypos matchlist matchstr matchstrlist matchstrpos max menu_info min mkdir mode mzeval nextnonblank nr2char or pathshorten perleval popup_atcursor popup_beval popup_clear popup_close popup_create popup_dialog popup_filter_menu popup_filter_yesno popup_findecho
+syn keyword vimFuncName contained popup_findinfo popup_findpreview popup_getoptions popup_getpos popup_hide popup_list popup_locate popup_menu popup_move popup_notification popup_setoptions popup_settext popup_show pow prevnonblank printf prompt_getprompt prompt_setcallback prompt_setinterrupt prompt_setprompt prop_add prop_add_list prop_clear prop_find prop_list prop_remove prop_type_add prop_type_change prop_type_delete prop_type_get prop_type_list pum_getpos pumvisible py3eval pyeval pyxeval rand range readblob readdir readdirex readfile reduce reg_executing reg_recording reltime reltimefloat reltimestr remote_expr remote_foreground remote_peek remote_read remote_send remote_startserver remove rename repeat resolve reverse round rubyeval screenattr screenchar
+syn keyword vimFuncName contained screenchars screencol screenpos screenrow screenstring search searchcount searchdecl searchpair searchpairpos searchpos server2client serverlist setbufline setbufvar setcellwidths setcharpos setcharsearch setcmdline setcmdpos setcursorcharpos setenv setfperm setline setloclist setmatches setpos setqflist setreg settabvar settabwinvar settagstack setwinvar sha256 shellescape shiftwidth sign_define sign_getdefined sign_getplaced sign_jump sign_place sign_placelist sign_undefine sign_unplace sign_unplacelist simplify sin sinh slice sort sound_clear sound_playevent sound_playfile sound_stop soundfold spellbadword spellsuggest split sqrt srand state str2float str2list str2nr strcharlen strcharpart strchars strdisplaywidth strftime
+syn keyword vimFuncName contained strgetchar stridx string strlen strpart strptime strridx strtrans strutf16len strwidth submatch substitute swapfilelist swapinfo swapname synID synIDattr synIDtrans synconcealed synstack system systemlist tabpagebuflist tabpagenr tabpagewinnr tagfiles taglist tan tanh tempname term_dumpdiff term_dumpload term_dumpwrite term_getaltscreen term_getansicolors term_getattr term_getcursor term_getjob term_getline term_getscrolled term_getsize term_getstatus term_gettitle term_gettty term_list term_scrape term_sendkeys term_setansicolors term_setapi term_setkill term_setrestore term_setsize term_start term_wait terminalprops test_alloc_fail test_autochdir test_feedinput test_garbagecollect_now test_garbagecollect_soon test_getvalue test_gui_event
+syn keyword vimFuncName contained test_ignore_error test_mswin_event test_null_blob test_null_channel test_null_dict test_null_function test_null_job test_null_list test_null_partial test_null_string test_option_not_set test_override test_refcount test_setmouse test_settime test_srand_seed test_unknown test_void timer_info timer_pause timer_start timer_stop timer_stopall tolower toupper tr trim trunc type typename undofile undotree uniq utf16idx values virtcol virtcol2col visualmode wildmenumode win_execute win_findbuf win_getid win_gettype win_gotoid win_id2tabwin win_id2win win_move_separator win_move_statusline win_screenpos win_splitmove winbufnr wincol windowsversion winheight winlayout winline winnr winrestcmd winrestview winsaveview winwidth wordcount writefile
+syn keyword vimFuncName contained xor
 
 "--- syntax here and above generated by mkvimvim ---
 " Special Vim Highlighting (not automatic) {{{1
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 3028cf9754..9720691b44 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -2007,6 +2007,8 @@ static funcentry_T global_functions[] =
 			ret_void,	    f_feedkeys},
     {"file_readable",	1, 1, FEARG_1,	    arg1_string,	// obsolete
 			ret_number_bool,    f_filereadable},
+    {"filecopy",	2, 2, FEARG_1,	    arg2_string,
+			ret_number_bool,    f_filecopy},
     {"filereadable",	1, 1, FEARG_1,	    arg1_string,
 			ret_number_bool,    f_filereadable},
     {"filewritable",	1, 1, FEARG_1,	    arg1_string,
diff --git a/src/fileio.c b/src/fileio.c
index 07e05fc802..e7f333208e 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3770,19 +3770,12 @@ vim_fgets(char_u *buf, int size, FILE *fp)
     int
 vim_rename(char_u *from, char_u *to)
 {
-    int		fd_in;
-    int		fd_out;
     int		n;
-    char	*errmsg = NULL;
-    char	*buffer;
+    int		ret;
 #ifdef AMIGA
     BPTR	flock;
 #endif
     stat_T	st;
-    long	perm;
-#ifdef HAVE_ACL
-    vim_acl_T	acl;		// ACL from original file
-#endif
     int		use_tmp_file = FALSE;
 
     /*
@@ -3903,6 +3896,61 @@ vim_rename(char_u *from, char_u *to)
     /*
      * Rename() failed, try copying the file.
      */
+    ret = vim_copyfile(from, to);
+    if (ret != OK)
+	return -1;
+
+    /*
+     * Remove copied original file
+     */
+    if (mch_stat((char *)from, &st) >= 0)
+	mch_remove(from);
+
+    return 0;
+}
+
+
+/*
+ * Create the new file with same permissions as the original.
+ * Return -1 for failure, 0 for success.
+ */
+    int
+vim_copyfile(char_u *from, char_u *to)
+{
+    int		fd_in;
+    int		fd_out;
+    int		n;
+    char	*errmsg = NULL;
+    char	*buffer;
+    long	perm;
+#ifdef HAVE_ACL
+    vim_acl_T	acl;		// ACL from original file
+#endif
+
+#ifdef HAVE_READLINK
+    int		ret;
+    int		len;
+    stat_T	st;
+    char	linkbuf[MAXPATHL + 1];
+
+    ret = mch_lstat((char *)from, &st);
+    if (ret >= 0 && S_ISLNK(st.st_mode))
+    {
+        ret = FAIL;
+
+	len = readlink((char *)from, linkbuf, MAXPATHL);
+	if (len > 0)
+	{
+	    linkbuf[len] = NUL;
+
+	    // Create link
+	    ret = symlink(linkbuf, (char *)to);
+	}
+
+	return ret == 0 ? OK : FAIL;
+    }
+#endif
+
     perm = mch_getperm(from);
 #ifdef HAVE_ACL
     // For systems that support ACL: get the ACL from the original file.
@@ -3914,7 +3962,7 @@ vim_rename(char_u *from, char_u *to)
 #ifdef HAVE_ACL
 	mch_free_acl(acl);
 #endif
-	return -1;
+	return FAIL;
     }
 
     // Create the new file with same permissions as the original.
@@ -3926,7 +3974,7 @@ vim_rename(char_u *from, char_u *to)
 #ifdef HAVE_ACL
 	mch_free_acl(acl);
 #endif
-	return -1;
+	return FAIL;
     }
 
     buffer = alloc(WRITEBUFSIZE);
@@ -3937,7 +3985,7 @@ vim_rename(char_u *from, char_u *to)
 #ifdef HAVE_ACL
 	mch_free_acl(acl);
 #endif
-	return -1;
+	return FAIL;
     }
 
     while ((n = read_eintr(fd_in, buffer, WRITEBUFSIZE)) > 0)
@@ -3969,10 +4017,9 @@ vim_rename(char_u *from, char_u *to)
     if (errmsg != NULL)
     {
 	semsg(errmsg, to);
-	return -1;
+	return FAIL;
     }
-    mch_remove(from);
-    return 0;
+    return OK;
 }
 
 static int already_warned = FALSE;
diff --git a/src/filepath.c b/src/filepath.c
index e68075a45e..9f68d7c688 100644
--- a/src/filepath.c
+++ b/src/filepath.c
@@ -2649,6 +2649,31 @@ f_browsedir(typval_T *argvars UNUSED, typval_T *rettv)
     rettv->v_type = VAR_STRING;
 }
 
+/*
+ * "filecopy()" function
+ */
+    void
+f_filecopy(typval_T *argvars, typval_T *rettv)
+{
+    char_u	*from;
+    stat_T	st;
+
+    rettv->vval.v_number = FALSE;
+
+    if (check_restricted() || check_secure()
+	|| check_for_string_arg(argvars, 0) == FAIL
+	|| check_for_string_arg(argvars, 1) == FAIL)
+	return;
+
+    from = tv_get_string(&argvars[0]);
+
+    if (mch_lstat((char *)from, &st) >= 0
+	&& (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)))
+	rettv->vval.v_number = vim_copyfile(
+	    tv_get_string(&argvars[0]),
+	    tv_get_string(&argvars[1])) == OK ? TRUE : FALSE;
+}
+
 #endif // FEAT_EVAL
 
 /*
diff --git a/src/proto/fileio.pro b/src/proto/fileio.pro
index 3f7b30d448..8d978709fc 100644
--- a/src/proto/fileio.pro
+++ b/src/proto/fileio.pro
@@ -26,6 +26,7 @@ char_u *modname(char_u *fname, char_u *ext, int prepend_dot);
 char_u *buf_modname(int shortname, char_u *fname, char_u *ext, int prepend_dot);
 int vim_fgets(char_u *buf, int size, FILE *fp);
 int vim_rename(char_u *from, char_u *to);
+int vim_copyfile(char_u *from, char_u *to);
 int check_timestamps(int focus);
 int buf_check_timestamp(buf_T *buf, int focus);
 void buf_reload(buf_T *buf, int orig_mode, int reload_options);
diff --git a/src/proto/filepath.pro b/src/proto/filepath.pro
index 53fa4ec3ff..46f51cb36f 100644
--- a/src/proto/filepath.pro
+++ b/src/proto/filepath.pro
@@ -6,6 +6,7 @@ void f_chdir(typval_T *argvars, typval_T *rettv);
 void f_delete(typval_T *argvars, typval_T *rettv);
 void f_executable(typval_T *argvars, typval_T *rettv);
 void f_exepath(typval_T *argvars, typval_T *rettv);
+void f_filecopy(typval_T *argvars, typval_T *rettv);
 void f_filereadable(typval_T *argvars, typval_T *rettv);
 void f_filewritable(typval_T *argvars, typval_T *rettv);
 void f_finddir(typval_T *argvars, typval_T *rettv);
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index a80b1300e5..e31d2b5f3e 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -143,6 +143,7 @@ NEW_TESTS = \
 	test_file_perm \
 	test_file_size \
 	test_filechanged \
+	test_filecopy \
 	test_fileformat \
 	test_filetype \
 	test_filter_cmd \
@@ -404,6 +405,7 @@ NEW_TESTS_RES = \
 	test_expr.res \
 	test_file_size.res \
 	test_filechanged.res \
+	test_filecopy.res \
 	test_fileformat.res \
 	test_filetype.res \
 	test_filter_cmd.res \
diff --git a/src/testdir/test_filecopy.vim b/src/testdir/test_filecopy.vim
new file mode 100644
index 0000000000..b526dce7b8
--- /dev/null
+++ b/src/testdir/test_filecopy.vim
@@ -0,0 +1,72 @@
+" Test filecopy()
+
+source check.vim
+source shared.vim
+
+func Test_copy_file_to_file()
+  call writefile(['foo'], 'Xcopy1')
+
+  call assert_true(filecopy('Xcopy1', 'Xcopy2'))
+
+  call assert_equal(['foo'], readfile('Xcopy2'))
+
+  " When the destination file already exists, it should not be overwritten.
+  call writefile(['foo'], 'Xcopy1')
+  call writefile(['bar'], 'Xcopy2', 'D')
+  call assert_false(filecopy('Xcopy1', 'Xcopy2'))
+  call assert_equal(['bar'], readfile('Xcopy2'))
+
+  call delete('Xcopy2')
+  call delete('Xcopy1')
+endfunc
+
+func Test_copy_symbolic_link()
+  CheckUnix
+
+  call writefile(['text'], 'Xtestfile', 'D')
+  silent !ln -s -f Xtestfile Xtestlink
+
+  call assert_true(filecopy('Xtestlink', 'Xtestlink2'))
+  call assert_equal('link', getftype('Xtestlink2'))
+  call assert_equal(['text'], readfile('Xtestlink2'))
+
+  " When the destination file already exists, it should not be overwritten.
+  call assert_false(filecopy('Xtestlink', 'Xtestlink2'))
+
+  call delete('Xtestlink2')
+  call delete('Xtestlink')
+  call delete('Xtestfile')
+endfunc
+
+func Test_copy_dir_to_dir()
+  call mkdir('Xcopydir1')
+  call writefile(['foo'], 'Xcopydir1/Xfilecopy')
+  call mkdir('Xcopydir2')
+
+  " Directory copy is not supported
+  call assert_false(filecopy('Xcopydir1', 'Xcopydir2'))
+
+  call delete('Xcopydir2', 'rf')
+  call delete('Xcopydir1', 'rf')
+endfunc
+
+func Test_copy_fails()
+  CheckUnix
+
+  call writefile(['foo'], 'Xfilecopy', 'D')
+
+  " Can't copy into a non-existing directory.
+  call assert_false(filecopy('Xfilecopy', 'Xdoesnotexist/Xfilecopy'))
+
+  " Can't copy a non-existing file.
+  call assert_false(filecopy('Xdoesnotexist', 'Xfilecopy2'))
+  call assert_equal('', glob('Xfilecopy2'))
+
+  " Can't copy to en empty file name.
+  call assert_false(filecopy('Xfilecopy', ''))
+
+  call assert_fails('call filecopy("Xfilecopy", [])', 'E1174:')
+  call assert_fails('call filecopy(0z, "Xfilecopy")', 'E1174:')
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 4b1bcf1bad..c3d61998cd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    465,
+/**/
     464,
 /**/
     463,