# HG changeset patch
# User Christian Brabandt <cb@256bit.org>
# Date 1471376706 -7200
# Node ID 41c5d59e7e10cfc6592f6378e0d1d05f8032d2a9
# Parent  ec73a26cd6cffc5276e310841ee2cf9a8eefbac0
commit https://github.com/vim/vim/commit/e5a8f35b4286135f3469f3b00a6c2220553d9658
Author: Bram Moolenaar <Bram@vim.org>
Date:   Tue Aug 16 21:30:54 2016 +0200

    patch 7.4.2220
    Problem:    printf() gives an error when the argument for %s is not a string.
                (Ozaki Kiichi)
    Solution:   Behave like invoking string() on the argument. (Ken Takata)

diff --git a/src/message.c b/src/message.c
--- a/src/message.c
+++ b/src/message.c
@@ -3887,7 +3887,7 @@ do_browse(
 static char *e_printf = N_("E766: Insufficient arguments for printf()");
 
 static varnumber_T tv_nr(typval_T *tvs, int *idxp);
-static char *tv_str(typval_T *tvs, int *idxp);
+static char *tv_str(typval_T *tvs, int *idxp, char_u **tofree);
 # ifdef FEAT_FLOAT
 static double tv_float(typval_T *tvs, int *idxp);
 # endif
@@ -3916,20 +3916,28 @@ tv_nr(typval_T *tvs, int *idxp)
 
 /*
  * Get string argument from "idxp" entry in "tvs".  First entry is 1.
+ * If "tofree" is NULL get_tv_string_chk() is used.  Some types (e.g. List)
+ * are not converted to a string.
+ * If "tofree" is not NULL echo_string() is used.  All types are converted to
+ * a string with the same format as ":echo".  The caller must free "*tofree".
  * Returns NULL for an error.
  */
     static char *
-tv_str(typval_T *tvs, int *idxp)
+tv_str(typval_T *tvs, int *idxp, char_u **tofree)
 {
-    int		idx = *idxp - 1;
-    char	*s = NULL;
+    int		    idx = *idxp - 1;
+    char	    *s = NULL;
+    static char_u   numbuf[NUMBUFLEN];
 
     if (tvs[idx].v_type == VAR_UNKNOWN)
 	EMSG(_(e_printf));
     else
     {
 	++*idxp;
-	s = (char *)get_tv_string_chk(&tvs[idx]);
+	if (tofree != NULL)
+	    s = (char *)echo_string(&tvs[idx], tofree, numbuf, get_copyID());
+	else
+	    s = (char *)get_tv_string_chk(&tvs[idx]);
     }
     return s;
 }
@@ -4113,6 +4121,10 @@ vim_vsnprintf(
 	    /* current conversion specifier character */
 	    char    fmt_spec = '\0';
 
+	    /* buffer for 's' and 'S' specs */
+	    char_u  *tofree = NULL;
+
+
 	    str_arg = NULL;
 	    p++;  /* skip '%' */
 
@@ -4276,7 +4288,7 @@ vim_vsnprintf(
 		case 'S':
 		    str_arg =
 # if defined(FEAT_EVAL)
-				tvs != NULL ? tv_str(tvs, &arg_idx) :
+				tvs != NULL ? tv_str(tvs, &arg_idx, &tofree) :
 # endif
 				    va_arg(ap, char *);
 		    if (str_arg == NULL)
@@ -4367,7 +4379,8 @@ vim_vsnprintf(
 			length_modifier = '\0';
 			ptr_arg =
 # if defined(FEAT_EVAL)
-				 tvs != NULL ? (void *)tv_str(tvs, &arg_idx) :
+				 tvs != NULL ? (void *)tv_str(tvs, &arg_idx,
+									NULL) :
 # endif
 					va_arg(ap, void *);
 			if (ptr_arg != NULL)
@@ -4877,6 +4890,7 @@ vim_vsnprintf(
 		    str_l += pn;
 		}
 	    }
+	    vim_free(tofree);
 	}
     }
 
diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -136,6 +136,33 @@ function Test_printf_64bit()
   endif
 endfunc
 
+function Test_printf_spec_s()
+  " number
+  call assert_equal("1234567890", printf('%s', 1234567890))
+
+  " string
+  call assert_equal("abcdefgi", printf('%s', "abcdefgi"))
+
+  " float
+  if has('float')
+    call assert_equal("1.23", printf('%s', 1.23))
+  endif
+
+  " list
+  let value = [1, 'two', ['three', 4]]
+  call assert_equal(string(value), printf('%s', value))
+
+  " dict
+  let value = {'key1' : 'value1', 'key2' : ['list', 'value'], 'key3' : {'dict' : 'value'}}
+  call assert_equal(string(value), printf('%s', value))
+
+  " funcref
+  call assert_equal('printf', printf('%s', function('printf')))
+
+  " partial
+  call assert_equal(string(function('printf', ['%s'])), printf('%s', function('printf', ['%s'])))
+endfunc
+
 func Test_substitute_expr()
   let g:val = 'XXX'
   call assert_equal('XXX', substitute('yyy', 'y*', '\=g:val', ''))
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -764,6 +764,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2220,
+/**/
     2219,
 /**/
     2218,