patch 8.2.0943: displaying ^M or ^J depends on current buffer

Problem:    Displaying ^M or ^J depends on current buffer.
Solution:   Pass the displayed buffer to transchar(). (closes #6225)

src/charset.c

@@ -499,18 +499,24 @@ str_foldcase(
  * Also doesn't work for the first byte of a multi-byte, "c" must be a
  * character!
  */
-static char_u	transchar_buf[7];
+static char_u	transchar_charbuf[7];
 
     char_u *
 transchar(int c)
+{
+    return transchar_buf(curbuf, c);
+}
+
+    char_u *
+transchar_buf(buf_T *buf, int c)
 {
     int			i;
 
     i = 0;
     if (IS_SPECIAL(c))	    // special key code, display as ~@ char
     {
-	transchar_buf[0] = '~';
+	transchar_charbuf[0] = '~';
-	transchar_buf[1] = '@';
+	transchar_charbuf[1] = '@';
 	i = 2;
 	c = K_SECOND(c);
     }
@@ -524,12 +530,12 @@ transchar(int c)
 		)) || (c < 256 && vim_isprintc_strict(c)))
     {
 	// printable character
-	transchar_buf[i] = c;
+	transchar_charbuf[i] = c;
-	transchar_buf[i + 1] = NUL;
+	transchar_charbuf[i + 1] = NUL;
     }
     else
-	transchar_nonprint(transchar_buf + i, c);
+	transchar_nonprint(buf, transchar_charbuf + i, c);
-    return transchar_buf;
+    return transchar_charbuf;
 }
 
 /*
@@ -541,27 +547,27 @@ transchar_byte(int c)
 {
     if (enc_utf8 && c >= 0x80)
     {
-	transchar_nonprint(transchar_buf, c);
+	transchar_nonprint(curbuf, transchar_charbuf, c);
-	return transchar_buf;
+	return transchar_charbuf;
     }
     return transchar(c);
 }
 
 /*
  * Convert non-printable character to two or more printable characters in
- * "buf[]".  "buf" needs to be able to hold five bytes.
+ * "buf[]".  "charbuf" needs to be able to hold five bytes.
  * Does NOT work for multi-byte characters, c must be <= 255.
  */
     void
-transchar_nonprint(char_u *buf, int c)
+transchar_nonprint(buf_T *buf, char_u *charbuf, int c)
 {
     if (c == NL)
 	c = NUL;		// we use newline in place of a NUL
-    else if (c == CAR && get_fileformat(curbuf) == EOL_MAC)
+    else if (c == CAR && get_fileformat(buf) == EOL_MAC)
 	c = NL;			// we use CR in place of  NL in this case
 
     if (dy_flags & DY_UHEX)		// 'display' has "uhex"
-	transchar_hex(buf, c);
+	transchar_hex(charbuf, c);
 
 #ifdef EBCDIC
     // For EBCDIC only the characters 0-63 and 255 are not printable
@@ -570,35 +576,35 @@ transchar_nonprint(char_u *buf, int c)
     else if (c <= 0x7f)			// 0x00 - 0x1f and 0x7f
 #endif
     {
-	buf[0] = '^';
+	charbuf[0] = '^';
 #ifdef EBCDIC
 	if (c == DEL)
-	    buf[1] = '?';		// DEL displayed as ^?
+	    charbuf[1] = '?';		// DEL displayed as ^?
 	else
-	    buf[1] = CtrlChar(c);
+	    charbuf[1] = CtrlChar(c);
 #else
-	buf[1] = c ^ 0x40;		// DEL displayed as ^?
+	charbuf[1] = c ^ 0x40;		// DEL displayed as ^?
 #endif
 
-	buf[2] = NUL;
+	charbuf[2] = NUL;
     }
     else if (enc_utf8 && c >= 0x80)
     {
-	transchar_hex(buf, c);
+	transchar_hex(charbuf, c);
     }
 #ifndef EBCDIC
     else if (c >= ' ' + 0x80 && c <= '~' + 0x80)    // 0xa0 - 0xfe
     {
-	buf[0] = '|';
+	charbuf[0] = '|';
-	buf[1] = c - 0x80;
+	charbuf[1] = c - 0x80;
-	buf[2] = NUL;
+	charbuf[2] = NUL;
     }
 #else
     else if (c < 64)
     {
-	buf[0] = '~';
+	charbuf[0] = '~';
-	buf[1] = MetaChar(c);
+	charbuf[1] = MetaChar(c);
-	buf[2] = NUL;
+	charbuf[2] = NUL;
     }
 #endif
     else					    // 0x80 - 0x9f and 0xff
@@ -607,13 +613,13 @@ transchar_nonprint(char_u *buf, int c)
 	 * TODO: EBCDIC I don't know what to do with this chars, so I display
 	 * them as '~?' for now
 	 */
-	buf[0] = '~';
+	charbuf[0] = '~';
 #ifdef EBCDIC
-	buf[1] = '?';			// 0xff displayed as ~?
+	charbuf[1] = '?';			// 0xff displayed as ~?
 #else
-	buf[1] = (c - 0x80) ^ 0x40;	// 0xff displayed as ~?
+	charbuf[1] = (c - 0x80) ^ 0x40;	// 0xff displayed as ~?
 #endif
-	buf[2] = NUL;
+	charbuf[2] = NUL;
     }
 }
 

src/drawline.c

@@ -1764,7 +1764,7 @@ win_line(
 			    {
 				// head byte at end of line
 				mb_l = 1;
-				transchar_nonprint(extra, c);
+				transchar_nonprint(wp->w_buffer, extra, c);
 			    }
 			    else
 			    {
@@ -2224,7 +2224,7 @@ win_line(
 		}
 		else if (c != NUL)
 		{
-		    p_extra = transchar(c);
+		    p_extra = transchar_buf(wp->w_buffer, c);
 		    if (n_extra == 0)
 			n_extra = byte2cells(c) - 1;
 #ifdef FEAT_RIGHTLEFT

src/ex_cmds.c

@@ -69,7 +69,7 @@ do_ascii(exarg_T *eap UNUSED)
 #endif
 			       ))
 	{
-	    transchar_nonprint(buf3, c);
+	    transchar_nonprint(curbuf, buf3, c);
 	    vim_snprintf(buf1, sizeof(buf1), "  <%s>", (char *)buf3);
 	}
 	else
@@ -2556,7 +2556,7 @@ do_ecmd(
     }
 
     /*
-     * if the file was changed we may not be allowed to abandon it
+     * If the file was changed we may not be allowed to abandon it:
      * - if we are going to re-edit the same file
      * - or if we are the only window on this file and if ECMD_HIDE is FALSE
      */

src/gui_beval.c

@@ -840,7 +840,7 @@ set_printable_label_text(GtkLabel *label, char_u *text)
 		    }
 		    else
 		    {
-			transchar_nonprint(pdest, *p);	// ^X
+			transchar_nonprint(curbuf, pdest, *p);	// ^X
 			outlen = 2;
 		    }
 		    if (pixel != INVALCOLOR)

src/message.c

@@ -1752,7 +1752,7 @@ str2special(
 	// For multi-byte characters check for an illegal byte.
 	if (has_mbyte && MB_BYTE2LEN(*str) > len)
 	{
-	    transchar_nonprint(buf, c);
+	    transchar_nonprint(curbuf, buf, c);
 	    *sp = str + 1;
 	    return buf;
 	}

src/proto/charset.pro

@@ -5,8 +5,9 @@ void trans_characters(char_u *buf, int bufsize);
 char_u *transstr(char_u *s);
 char_u *str_foldcase(char_u *str, int orglen, char_u *buf, int buflen);
 char_u *transchar(int c);
+char_u *transchar_buf(buf_T *buf, int c);
 char_u *transchar_byte(int c);
-void transchar_nonprint(char_u *buf, int c);
+void transchar_nonprint(buf_T *buf, char_u *charbuf, int c);
 void transchar_hex(char_u *buf, int c);
 int byte2cells(int b);
 int char2cells(int c);

src/testdir/dumps/Test_display_unprintable_01.dump

@@ -0,0 +1,9 @@
+>m+0&#ffffff0|a|c| @46
+|^+0#0000e05&|J|t+0#0000000&|w|o|^+0#0000e05&|J| +0#0000000&@42
+|~+0#4040ff13&| @48
+|X+3#0000000&|m|a|c|.|t|x|t| @23|1|,|1| @11|A|l@1
+|u+0&&|n|i|x|^+0#0000e05&|M| +0#0000000&@43
+|t|w|o| @46
+|~+0#4040ff13&| @48
+|X+1#0000000&|u|n|i|x|.|t|x|t| @22|1|,|1| @11|A|l@1
+|"+0&&|X|m|a|c|.|t|x|t|"| |[|n|o|e|o|l|]|[|m|a|c|]| |2|L|,| |9|C| @19

src/testdir/dumps/Test_display_unprintable_02.dump

@@ -0,0 +1,9 @@
+|m+0&#ffffff0|a|c| @46
+|^+0#0000e05&|J|t+0#0000000&|w|o|^+0#0000e05&|J| +0#0000000&@42
+|~+0#4040ff13&| @48
+|X+1#0000000&|m|a|c|.|t|x|t| @23|1|,|1| @11|A|l@1
+>u+0&&|n|i|x|^+0#0000e05&|M| +0#0000000&@43
+|t|w|o| @46
+|~+0#4040ff13&| @48
+|X+3#0000000&|u|n|i|x|.|t|x|t| @22|1|,|1| @11|A|l@1
+| +0&&@49

src/testdir/test_display.vim

@@ -197,3 +197,26 @@ func Test_edit_long_file_name()
   call delete(longName)
 endfunc
 
+func Test_unprintable_fileformats()
+  CheckScreendump
+
+  call writefile(["unix\r", "two"], 'Xunix.txt')
+  call writefile(["mac\r", "two"], 'Xmac.txt')
+  let lines =<< trim END
+    edit Xunix.txt
+    split Xmac.txt
+    edit ++ff=mac
+  END
+  let filename = 'Xunprintable'
+  call writefile(lines, filename)
+  let buf = RunVimInTerminal('-S '.filename, #{rows: 9, cols: 50})
+  call VerifyScreenDump(buf, 'Test_display_unprintable_01', {})
+  call term_sendkeys(buf, "\<C-W>\<C-W>\<C-L>")
+  call VerifyScreenDump(buf, 'Test_display_unprintable_02', {})
+
+  " clean up
+  call StopVimInTerminal(buf)
+  call delete('Xunix.txt')
+  call delete('Xmac.txt')
+  call delete(filename)
+endfunc

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    943,
 /**/
     942,
 /**/