Blame SOURCES/bash-4.2-noecho.patch

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--- bash-4.2/parse.y	2014-05-29 14:46:09.545543384 +0200
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+++ bash-4.2/parse.y	2014-05-29 14:48:40.758626213 +0200
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@@ -3858,6 +3858,8 @@ xparse_dolparen (base, string, indp, fla
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     sflags |= SEVAL_NOLONGJMP;
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   save_parser_state (&ps);
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   save_input_line_state (&ls);
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+  /* avoid echoing every substitution again */
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+  echo_input_at_read = 0;
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   /*(*/
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   parser_state |= PST_CMDSUBST|PST_EOFTOKEN;	/* allow instant ')' */ /*(*/
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--- bash-4.2/subst.c	2014-05-29 16:04:35.802784549 +0200
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+++ bash-4.2/subst.c	2014-05-29 16:08:25.021942676 +0200
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@@ -7103,6 +7103,7 @@ param_expand (string, sindex, quoted, ex
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   WORD_LIST *list;
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   WORD_DESC *tdesc, *ret;
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   int tflag;
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+  int old_echo_input;
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   zindex = *sindex;
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   c = string[++zindex];
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@@ -7401,6 +7402,9 @@ arithsub:
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 	}
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 comsub:
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+      old_echo_input = echo_input_at_read;
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+      /* avoid echoing every substitution again */
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+      echo_input_at_read = 0;
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       if (pflags & PF_NOCOMSUB)
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 	/* we need zindex+1 because string[zindex] == RPAREN */
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 	temp1 = substring (string, *sindex, zindex+1);
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@@ -7413,6 +7417,7 @@ comsub:
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 	}
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       FREE (temp);
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       temp = temp1;
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+      echo_input_at_read = old_echo_input;
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       break;
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     /* Do POSIX.2d9-style arithmetic substitution.  This will probably go