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 tarball for details.
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)
21 /* bash builtin "echo -e '\ec'" interprets \e as ESC,
22 * but coreutils "/bin/echo -e '\ec'" does not.
23 * manpages tend to support coreutils way.
24 * Update: coreutils added support for \e on 28 Oct 2009. */
25 static const char charmap[] ALIGN1 = {
26 'a', 'b', 'e', 'f', 'n', 'r', 't', 'v', '\\', 0,
27 '\a', '\b', 27, '\f', '\n', '\r', '\t', '\v', '\\', '\\' };
41 #ifdef WANT_HEX_ESCAPES
49 /* bash requires leading 0 in octal escapes:
50 * \02 works, \2 does not (prints \ and 2).
51 * We treat \2 as a valid octal escape sequence. */
53 d = (unsigned char)(*q) - '0';
54 #ifdef WANT_HEX_ESCAPES
56 d = (unsigned char)(_tolower(*q)) - 'a' + 10;
61 #ifdef WANT_HEX_ESCAPES
62 if ((base == 16) && (!--num_digits)) {
77 } while (++num_digits < 3);
79 if (num_digits == 0) { /* mnemonic escape sequence? */
87 /* p points to found escape char or NUL,
88 * advance it and find what it translates to */
89 p += sizeof(charmap) / 2;