[RDY] vim-patch:7.4.456

```
Problem:  'backupcopy' is global, cannot write only some
          files in a different way.
Solution: Make 'backupcopy' global-local. (Christian Brabandt)

https://code.google.com/p/vim/source/detail?r=v7-4-456
```

Succeeds #1228. Changed the type for the flags per https://github.com/neovim/neovim/pull/1228#discussion_r18125563, but used `unsigned int` instead of suggested `int` (seems to be used for other flags, e.g. https://github.com/neovim/neovim/blob/7fc7f026ad1103b1f6670507cd9cd7a816ae3539/src/nvim/option_defs.h#L310).

Original patch:

```diff
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -921,7 +921,7 @@ A jump table for the options with a shor
 
 						*'backupcopy'* *'bkc'*
 'backupcopy' 'bkc'	string	(Vi default for Unix: "yes", otherwise: "auto")
-			global
+			global or local to buffer |global-local|
 			{not in Vi}
 	When writing a file and a backup is made, this option tells how it's
 	done.  This is a comma separated list of words.
diff --git a/src/buffer.c b/src/buffer.c
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2001,6 +2001,7 @@ free_buf_options(buf, free_p_ff)
 #ifdef FEAT_LISP
     clear_string_option(&buf->b_p_lw);
 #endif
+    clear_string_option(&buf->b_p_bkc);
 }
 
 /*
diff --git a/src/fileio.c b/src/fileio.c
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3149,6 +3149,7 @@ buf_write(buf, fname, sfname, start, end
     int		    write_undo_file = FALSE;
     context_sha256_T sha_ctx;
 #endif
+    unsigned int    bkc = get_bkc_value(buf);
 
     if (fname == NULL || *fname == NUL)	/* safety check */
 	return FAIL;
@@ -3647,10 +3648,10 @@ buf_write(buf, fname, sfname, start, end
 	struct stat st;
 #endif
 
-	if ((bkc_flags & BKC_YES) || append)	/* "yes" */
+	if ((bkc & BKC_YES) || append)	/* "yes" */
 	    backup_copy = TRUE;
 #if defined(UNIX) || defined(WIN32)
-	else if ((bkc_flags & BKC_AUTO))	/* "auto" */
+	else if ((bkc & BKC_AUTO))	/* "auto" */
 	{
 	    int		i;
 
@@ -3738,7 +3739,7 @@ buf_write(buf, fname, sfname, start, end
 	/*
 	 * Break symlinks and/or hardlinks if we've been asked to.
 	 */
-	if ((bkc_flags & BKC_BREAKSYMLINK) || (bkc_flags & BKC_BREAKHARDLINK))
+	if ((bkc & BKC_BREAKSYMLINK) || (bkc & BKC_BREAKHARDLINK))
 	{
 # ifdef UNIX
 	    int	lstat_res;
@@ -3746,24 +3747,24 @@ buf_write(buf, fname, sfname, start, end
 	    lstat_res = mch_lstat((char *)fname, &st);
 
 	    /* Symlinks. */
-	    if ((bkc_flags & BKC_BREAKSYMLINK)
+	    if ((bkc & BKC_BREAKSYMLINK)
 		    && lstat_res == 0
 		    && st.st_ino != st_old.st_ino)
 		backup_copy = FALSE;
 
 	    /* Hardlinks. */
-	    if ((bkc_flags & BKC_BREAKHARDLINK)
+	    if ((bkc & BKC_BREAKHARDLINK)
 		    && st_old.st_nlink > 1
 		    && (lstat_res != 0 || st.st_ino == st_old.st_ino))
 		backup_copy = FALSE;
 # else
 #  if defined(WIN32)
 	    /* Symlinks. */
-	    if ((bkc_flags & BKC_BREAKSYMLINK) && mch_is_symbolic_link(fname))
+	    if ((bkc & BKC_BREAKSYMLINK) && mch_is_symbolic_link(fname))
 		backup_copy = FALSE;
 
 	    /* Hardlinks. */
-	    if ((bkc_flags & BKC_BREAKHARDLINK) && mch_is_hard_link(fname))
+	    if ((bkc & BKC_BREAKHARDLINK) && mch_is_hard_link(fname))
 		backup_copy = FALSE;
 #  endif
 # endif
diff --git a/src/option.c b/src/option.c
--- a/src/option.c
+++ b/src/option.c
@@ -56,6 +56,7 @@
  */
 #define PV_AI		OPT_BUF(BV_AI)
 #define PV_AR		OPT_BOTH(OPT_BUF(BV_AR))
+#define PV_BKC		OPT_BOTH(OPT_BUF(BV_BKC))
 #ifdef FEAT_QUICKFIX
 # define PV_BH		OPT_BUF(BV_BH)
 # define PV_BT		OPT_BUF(BV_BT)
@@ -582,7 +583,7 @@ static struct vimoption
 			    (char_u *)&p_bk, PV_NONE,
 			    {(char_u *)FALSE, (char_u *)0L} SCRIPTID_INIT},
     {"backupcopy",  "bkc",  P_STRING|P_VIM|P_COMMA|P_NODUP,
-			    (char_u *)&p_bkc, PV_NONE,
+			    (char_u *)&p_bkc, PV_BKC,
 #ifdef UNIX
 			    {(char_u *)"yes", (char_u *)"auto"}
 #else
@@ -5412,6 +5413,7 @@ check_buf_options(buf)
 #ifdef FEAT_LISP
     check_string_option(&buf->b_p_lw);
 #endif
+    check_string_option(&buf->b_p_bkc);
 }
 
 /*
@@ -5729,16 +5731,25 @@ did_set_string_option(opt_idx, varp, new
     }
 
     /* 'backupcopy' */
-    else if (varp == &p_bkc)
-    {
-	if (opt_strings_flags(p_bkc, p_bkc_values, &bkc_flags, TRUE) != OK)
+    else if (gvarp == &p_bkc)
+    {
+	char_u		*bkc = p_bkc;
+	unsigned int	*flags = &bkc_flags;
+
+	if (opt_flags & OPT_LOCAL)
+	{
+	    bkc = curbuf->b_p_bkc;
+	    flags = &curbuf->b_bkc_flags;
+	}
+
+	if (opt_strings_flags(bkc, p_bkc_values, flags, TRUE) != OK)
 	    errmsg = e_invarg;
-	if (((bkc_flags & BKC_AUTO) != 0)
-		+ ((bkc_flags & BKC_YES) != 0)
-		+ ((bkc_flags & BKC_NO) != 0) != 1)
+	if ((((int)*flags & BKC_AUTO) != 0)
+		+ (((int)*flags & BKC_YES) != 0)
+		+ (((int)*flags & BKC_NO) != 0) != 1)
 	{
 	    /* Must have exactly one of "auto", "yes"  and "no". */
-	    (void)opt_strings_flags(oldval, p_bkc_values, &bkc_flags, TRUE);
+	    (void)opt_strings_flags(oldval, p_bkc_values, flags, TRUE);
 	    errmsg = e_invarg;
 	}
     }
@@ -9025,12 +9036,13 @@ get_option_value_strict(name, numval, st
 }
 
 /*
- * Iterate over options. First argument is a pointer to a pointer to a structure 
- * inside options[] array, second is option type like in the above function.
+ * Iterate over options. First argument is a pointer to a pointer to a
+ * structure inside options[] array, second is option type like in the above
+ * function.
  *
- * If first argument points to NULL it is assumed that iteration just started 
+ * If first argument points to NULL it is assumed that iteration just started
  * and caller needs the very first value.
- * If first argument points to the end marker function returns NULL and sets 
+ * If first argument points to the end marker function returns NULL and sets
  * first argument to NULL.
  *
  * Returns full option name for current option on each call.
@@ -9856,6 +9868,10 @@ unset_global_local_option(name, from)
 	case PV_AR:
 	    buf->b_p_ar = -1;
 	    break;
+	case PV_BKC:
+	    clear_string_option(&buf->b_p_bkc);
+	    buf->b_bkc_flags = 0;
+	    break;
 	case PV_TAGS:
 	    clear_string_option(&buf->b_p_tags);
 	    break;
@@ -9961,6 +9977,7 @@ get_varp_scope(p, opt_flags)
 #ifdef FEAT_LISP
 	    case PV_LW:   return (char_u *)&(curbuf->b_p_lw);
 #endif
+	    case PV_BKC:  return (char_u *)&(curbuf->b_p_bkc);
 	}
 	return NULL; /* "cannot happen" */
     }
@@ -9993,6 +10010,8 @@ get_varp(p)
 				    ? (char_u *)&(curbuf->b_p_ar) : p->var;
 	case PV_TAGS:	return *curbuf->b_p_tags != NUL
 				    ? (char_u *)&(curbuf->b_p_tags) : p->var;
+	case PV_BKC:	return *curbuf->b_p_bkc != NUL
+				    ? (char_u *)&(curbuf->b_p_bkc) : p->var;
 #ifdef FEAT_FIND_ID
 	case PV_DEF:	return *curbuf->b_p_def != NUL
 				    ? (char_u *)&(curbuf->b_p_def) : p->var;
@@ -10585,6 +10604,8 @@ buf_copy_options(buf, flags)
 	     * are not copied, start using the global value */
 	    buf->b_p_ar = -1;
 	    buf->b_p_ul = NO_LOCAL_UNDOLEVEL;
+	    buf->b_p_bkc = empty_option;
+	    buf->b_bkc_flags = 0;
 #ifdef FEAT_QUICKFIX
 	    buf->b_p_gp = empty_option;
 	    buf->b_p_mp = empty_option;
@@ -12052,3 +12073,13 @@ briopt_check(wp)
     return OK;
 }
 #endif
+
+/*
+ * Get the local or global value of 'backupcopy'.
+ */
+    unsigned int
+get_bkc_value(buf)
+    buf_T *buf;
+{
+    return buf->b_bkc_flags ? buf->b_bkc_flags : bkc_flags;
+}
diff --git a/src/option.h b/src/option.h
--- a/src/option.h
+++ b/src/option.h
@@ -327,7 +327,7 @@ EXTERN char_u	*p_bs;		/* 'backspace' */
 EXTERN char_u	*p_bg;		/* 'background' */
 EXTERN int	p_bk;		/* 'backup' */
 EXTERN char_u	*p_bkc;		/* 'backupcopy' */
-EXTERN unsigned	bkc_flags;
+EXTERN unsigned	bkc_flags;	/* flags from 'backupcopy' */
 #ifdef IN_OPTION_C
 static char *(p_bkc_values[]) = {"yes", "auto", "no", "breaksymlink", "breakhardlink", NULL};
 #endif
@@ -918,6 +918,9 @@ enum
     , BV_AR
 #ifdef FEAT_QUICKFIX
     , BV_BH
+#endif
+    , BV_BKC
+#ifdef FEAT_QUICKFIX
     , BV_BT
     , BV_EFM
     , BV_GP
diff --git a/src/proto/option.pro b/src/proto/option.pro
--- a/src/proto/option.pro
+++ b/src/proto/option.pro
@@ -62,4 +62,5 @@ int check_ff_value __ARGS((char_u *p));
 long get_sw_value __ARGS((buf_T *buf));
 long get_sts_value __ARGS((void));
 void find_mps_values __ARGS((int *initc, int *findc, int *backwards, int switchit));
+unsigned int get_bkc_value __ARGS((buf_T *buf));
 /* vim: set ft=c : */
diff --git a/src/structs.h b/src/structs.h
--- a/src/structs.h
+++ b/src/structs.h
@@ -137,7 +137,7 @@ typedef struct
 #ifdef FEAT_LINEBREAK
     int		wo_bri;
 # define w_p_bri w_onebuf_opt.wo_bri	/* 'breakindent' */
-    char_u		*wo_briopt;
+    char_u	*wo_briopt;
 # define w_p_briopt w_onebuf_opt.wo_briopt /* 'breakindentopt' */
 #endif
 #ifdef FEAT_DIFF
@@ -1537,6 +1537,8 @@ struct file_buffer
 
     int		b_p_ai;		/* 'autoindent' */
     int		b_p_ai_nopaste;	/* b_p_ai saved for paste mode */
+    char_u	*b_p_bkc;	/* 'backupcopy' */
+    unsigned	b_bkc_flags;    /* flags for 'backupcopy' */
     int		b_p_ci;		/* 'copyindent' */
     int		b_p_bin;	/* 'binary' */
 #ifdef FEAT_MBYTE
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    456,
+/**/
     455,
 /**/
     454,
```