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diff -up cups-1.5.4/cups/backend.c.str4124 cups-1.5.4/cups/backend.c
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--- cups-1.5.4/cups/backend.c.str4124	2012-01-30 22:50:42.000000000 +0100
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+++ cups-1.5.4/cups/backend.c	2012-09-21 16:02:42.638864512 +0200
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@@ -125,7 +125,7 @@ quote_string(const char *s)		/* I - Stri
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       if (*s == '\\' || *s == '\"')
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 	putchar('\\');
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-      if (*s == '\n')
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+      if (((*s & 255) < ' ' && *s != '\t') || *s == 0x7f)
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         putchar(' ');
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       else
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         putchar(*s);