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.
12 #define WANT_HEX_ESCAPES 1
14 /* Usual "this only works for ascii compatible encodings" disclaimer. */
16 #define _tolower(X) ((X)|((char) 0x20))
18 char FAST_FUNC bb_process_escape_sequence(const char **ptr)
29 if (WANT_HEX_ESCAPES && *q == 'x') {
35 /* bash requires leading 0 in octal escapes:
36 * \02 works, \2 does not (prints \ and 2).
37 * We treat \2 as a valid octal escape sequence. */
41 unsigned d = (unsigned char)(*q) - '0';
43 unsigned d = (unsigned char)_tolower(*q) - '0';
45 d += ('0' - 'a' + 10);
48 if (WANT_HEX_ESCAPES && base == 16) {
50 if (num_digits == 0) {
51 /* \x<bad_char>: return '\',
52 * leave ptr pointing to x */
66 } while (++num_digits < 3);
68 if (num_digits == 0) {
69 /* Not octal or hex escape sequence.
70 * Is it one-letter one? */
72 /* bash builtin "echo -e '\ec'" interprets \e as ESC,
73 * but coreutils "/bin/echo -e '\ec'" does not.
74 * Manpages tend to support coreutils way.
75 * Update: coreutils added support for \e on 28 Oct 2009. */
76 static const char charmap[] ALIGN1 = {
77 'a', 'b', 'e', 'f', 'n', 'r', 't', 'v', '\\', '\0',
78 '\a', '\b', 27, '\f', '\n', '\r', '\t', '\v', '\\', '\\',
80 const char *p = charmap;
86 } while (*++p != '\0');
87 /* p points to found escape char or NUL,
88 * advance it and find what it translates to.
89 * Note that \NUL and unrecognized sequence \z return '\'
90 * and leave ptr pointing to NUL or z. */
91 n = p[sizeof(charmap) / 2];
99 char* FAST_FUNC strcpy_and_process_escape_sequences(char *dst, const char *src)
105 c1 = bb_process_escape_sequence(&src);