Blame SOURCES/0001-patch-8.2.4359-crash-when-repeatedly-using-retab.patch

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diff --git a/src/errors.h b/src/errors.h
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index 3008020..3daf1a6 100644
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--- a/src/errors.h
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+++ b/src/errors.h
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@@ -381,3 +381,5 @@ EXTERN char e_missing_end_block[]
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 	INIT(= N_("E1171: Missing } after inline function"));
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 EXTERN char e_cannot_use_default_values_in_lambda[]
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 	INIT(= N_("E1172: Cannot use default values in a lambda"));
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+EXTERN char e_resulting_text_too_long[]
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+	INIT(= N_("E1240: Resulting text too long"));
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diff --git a/src/indent.c b/src/indent.c
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index 4f909d0..77d8b0a 100644
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--- a/src/indent.c
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+++ b/src/indent.c
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@@ -1696,6 +1696,11 @@ ex_retab(exarg_T *eap)
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 	    if (ptr[col] == NUL)
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 		break;
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 	    vcol += chartabsize(ptr + col, (colnr_T)vcol);
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+	    if (vcol >= MAXCOL)
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+	    {
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+		emsg(_(e_resulting_text_too_long));
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+		break;
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+	    }
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 	    if (has_mbyte)
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 		col += (*mb_ptr2len)(ptr + col);
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 	    else
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diff --git a/src/testdir/test_retab.vim b/src/testdir/test_retab.vim
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index c7190aa..6133e8f 100644
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--- a/src/testdir/test_retab.vim
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+++ b/src/testdir/test_retab.vim
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@@ -70,6 +70,8 @@ func Test_retab()
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   call assert_equal("    a       b        c    ",         Retab('!', 3))
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   call assert_equal("    a       b        c    ",         Retab('',  5))
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   call assert_equal("    a       b        c    ",         Retab('!', 5))
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+
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+  set tabstop& expandtab&
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 endfunc
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 func Test_retab_error()
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@@ -80,4 +82,21 @@ func Test_retab_error()
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   call assert_fails('ret 80000000000000000000', 'E475:')
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 endfunc
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+func Test_retab_endless()
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+  new
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+  call setline(1, "\t0\t")
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+  let caught = 'no'
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+  try
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+    while 1
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+      set ts=4000
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+      retab 4
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+    endwhile
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+  catch /E1240/
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+    let caught = 'yes'
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+  endtry
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+  bwipe!
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+  set tabstop&
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+endfunc
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+
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+
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 " vim: shiftwidth=2 sts=2 expandtab