1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) Manuel Novoa III <mjn3@codepoet.org>
6 * and Vladimir Oleynik <dzo@simtreas.ru>
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
13 #define WANT_HEX_ESCAPES 1
15 /* Usual "this only works for ascii compatible encodings" disclaimer. */
17 #define _tolower(X) ((X)|((char) 0x20))
19 char FAST_FUNC
bb_process_escape_sequence(const char **ptr
)
30 if (WANT_HEX_ESCAPES
&& *q
== 'x') {
36 /* bash requires leading 0 in octal escapes:
37 * \02 works, \2 does not (prints \ and 2).
38 * We treat \2 as a valid octal escape sequence. */
42 unsigned d
= (unsigned char)(*q
) - '0';
44 unsigned d
= (unsigned char)_tolower(*q
) - '0';
46 d
+= ('0' - 'a' + 10);
49 if (WANT_HEX_ESCAPES
&& base
== 16) {
51 if (num_digits
== 0) {
52 /* \x<bad_char>: return '\',
53 * leave ptr pointing to x */
67 } while (++num_digits
< 3);
69 if (num_digits
== 0) {
70 /* Not octal or hex escape sequence.
71 * Is it one-letter one? */
73 /* bash builtin "echo -e '\ec'" interprets \e as ESC,
74 * but coreutils "/bin/echo -e '\ec'" does not.
75 * Manpages tend to support coreutils way.
76 * Update: coreutils added support for \e on 28 Oct 2009. */
77 static const char charmap
[] ALIGN1
= {
78 'a', 'b', 'e', 'f', 'n', 'r', 't', 'v', '\\', '\0',
79 '\a', '\b', 27, '\f', '\n', '\r', '\t', '\v', '\\', '\\',
81 const char *p
= charmap
;
87 } while (*++p
!= '\0');
88 /* p points to found escape char or NUL,
89 * advance it and find what it translates to.
90 * Note that \NUL and unrecognized sequence \z return '\'
91 * and leave ptr pointing to NUL or z. */
92 n
= p
[sizeof(charmap
) / 2];
100 char* FAST_FUNC
strcpy_and_process_escape_sequences(char *dst
, const char *src
)
106 c1
= bb_process_escape_sequence(&src
);