1 /* Quote a blob so that it can be used in C literals.
2 Copyright (C) 2018-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
19 #include <support/support.h>
20 #include <support/xmemstream.h>
23 SUPPORT_QUOTE_BLOB (const void *blob, size_t length)
25 struct xmemstream out;
26 xopen_memstream (&out);
29 for (size_t i = 0; i < length; ++i)
33 /* Use C backslash escapes for those control characters for
34 which they are defined. */
38 putc_unlocked ('\\', out.out);
39 putc_unlocked ('a', out.out);
42 putc_unlocked ('\\', out.out);
43 putc_unlocked ('b', out.out);
46 putc_unlocked ('\\', out.out);
47 putc_unlocked ('f', out.out);
50 putc_unlocked ('\\', out.out);
51 putc_unlocked ('n', out.out);
54 putc_unlocked ('\\', out.out);
55 putc_unlocked ('r', out.out);
58 putc_unlocked ('\\', out.out);
59 putc_unlocked ('t', out.out);
62 putc_unlocked ('\\', out.out);
63 putc_unlocked ('v', out.out);
68 putc_unlocked ('\\', out.out);
69 putc_unlocked (ch, out.out);
72 if (ch < L_(' ') || ch > L_('~'))
73 /* For narrow characters, use octal sequences because they
74 are fixed width, unlike hexadecimal sequences. For
75 wide characters, use N2785 delimited escape
78 fprintf (out.out, "\\x{%x}", (unsigned int) ch);
80 fprintf (out.out, "\\%03o", (unsigned int) ch);
82 putc_unlocked (ch, out.out);
86 xfclose_memstream (&out);