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de82cb0d | 1 | /* Quote a blob so that it can be used in C literals. |
6d7e8eda | 2 | Copyright (C) 2018-2023 Free Software Foundation, Inc. |
de82cb0d JM |
3 | This file is part of the GNU C Library. |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
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/>. */ | |
18 | ||
19 | #include <support/support.h> | |
20 | #include <support/xmemstream.h> | |
21 | ||
22 | char * | |
23 | SUPPORT_QUOTE_BLOB (const void *blob, size_t length) | |
24 | { | |
25 | struct xmemstream out; | |
26 | xopen_memstream (&out); | |
27 | ||
28 | const CHAR *p = blob; | |
29 | for (size_t i = 0; i < length; ++i) | |
30 | { | |
31 | CHAR ch = p[i]; | |
32 | ||
33 | /* Use C backslash escapes for those control characters for | |
34 | which they are defined. */ | |
35 | switch (ch) | |
36 | { | |
37 | case L_('\a'): | |
38 | putc_unlocked ('\\', out.out); | |
39 | putc_unlocked ('a', out.out); | |
40 | break; | |
41 | case L_('\b'): | |
42 | putc_unlocked ('\\', out.out); | |
43 | putc_unlocked ('b', out.out); | |
44 | break; | |
45 | case L_('\f'): | |
46 | putc_unlocked ('\\', out.out); | |
47 | putc_unlocked ('f', out.out); | |
48 | break; | |
49 | case L_('\n'): | |
50 | putc_unlocked ('\\', out.out); | |
51 | putc_unlocked ('n', out.out); | |
52 | break; | |
53 | case L_('\r'): | |
54 | putc_unlocked ('\\', out.out); | |
55 | putc_unlocked ('r', out.out); | |
56 | break; | |
57 | case L_('\t'): | |
58 | putc_unlocked ('\\', out.out); | |
59 | putc_unlocked ('t', out.out); | |
60 | break; | |
61 | case L_('\v'): | |
62 | putc_unlocked ('\\', out.out); | |
63 | putc_unlocked ('v', out.out); | |
64 | break; | |
65 | case L_('\\'): | |
66 | case L_('\''): | |
67 | case L_('\"'): | |
68 | putc_unlocked ('\\', out.out); | |
69 | putc_unlocked (ch, out.out); | |
70 | break; | |
71 | default: | |
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 | |
76 | sequences. */ | |
77 | if (WIDE) | |
78 | fprintf (out.out, "\\x{%x}", (unsigned int) ch); | |
79 | else | |
80 | fprintf (out.out, "\\%03o", (unsigned int) ch); | |
81 | else | |
82 | putc_unlocked (ch, out.out); | |
83 | } | |
84 | } | |
85 | ||
86 | xfclose_memstream (&out); | |
87 | return out.buffer; | |
88 | } |