1 files changed, 88 insertions, 0 deletions
diff --git a/support/support_quote_blob_main.c b/support/support_quote_blob_main.c
new file mode 100644
index 0000000000..19ccfad593
--- /dev/null
+++ b/support/support_quote_blob_main.c
@@ -0,0 +1,88 @@
+/* Quote a blob so that it can be used in C literals.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <support/support.h>
+#include <support/xmemstream.h>
+
+char *
+SUPPORT_QUOTE_BLOB (const void *blob, size_t length)
+{
+  struct xmemstream out;
+  xopen_memstream (&out);
+
+  const CHAR *p = blob;
+  for (size_t i = 0; i < length; ++i)
+    {
+      CHAR ch = p[i];
+
+      /* Use C backslash escapes for those control characters for
+	 which they are defined.  */
+      switch (ch)
+	{
+	case L_('\a'):
+	  putc_unlocked ('\\', out.out);
+	  putc_unlocked ('a', out.out);
+	  break;
+	case L_('\b'):
+	  putc_unlocked ('\\', out.out);
+	  putc_unlocked ('b', out.out);
+	  break;
+	case L_('\f'):
+	  putc_unlocked ('\\', out.out);
+	  putc_unlocked ('f', out.out);
+	  break;
+	case L_('\n'):
+	  putc_unlocked ('\\', out.out);
+	  putc_unlocked ('n', out.out);
+	  break;
+	case L_('\r'):
+	  putc_unlocked ('\\', out.out);
+	  putc_unlocked ('r', out.out);
+	  break;
+	case L_('\t'):
+	  putc_unlocked ('\\', out.out);
+	  putc_unlocked ('t', out.out);
+	  break;
+	case L_('\v'):
+	  putc_unlocked ('\\', out.out);
+	  putc_unlocked ('v', out.out);
+	  break;
+	case L_('\\'):
+	case L_('\''):
+	case L_('\"'):
+	  putc_unlocked ('\\', out.out);
+	  putc_unlocked (ch, out.out);
+	  break;
+	default:
+	  if (ch < L_(' ') || ch > L_('~'))
+	    /* For narrow characters, use octal sequences because they
+	       are fixed width, unlike hexadecimal sequences.  For
+	       wide characters, use N2785 delimited escape
+	       sequences.  */
+	    if (WIDE)
+	      fprintf (out.out, "\\x{%x}", (unsigned int) ch);
+	    else
+	      fprintf (out.out, "\\%03o", (unsigned int) ch);
+	  else
+	    putc_unlocked (ch, out.out);
+	}
+    }
+
+  xfclose_memstream (&out);
+  return out.buffer;
+}