Contents of /trunk/mkinitrd-magellan/busybox/libbb/process_escape_sequence.c
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
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File size: 1928 byte(s)
Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 1928 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * Copyright (C) Manuel Novoa III <mjn3@codepoet.org> |
6 | * and Vladimir Oleynik <dzo@simtreas.ru> |
7 | * |
8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
9 | */ |
10 | |
11 | #include "libbb.h" |
12 | |
13 | #define WANT_HEX_ESCAPES 1 |
14 | |
15 | /* Usual "this only works for ascii compatible encodings" disclaimer. */ |
16 | #undef _tolower |
17 | #define _tolower(X) ((X)|((char) 0x20)) |
18 | |
19 | char FAST_FUNC bb_process_escape_sequence(const char **ptr) |
20 | { |
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', '\\', '\\' }; |
28 | |
29 | const char *p; |
30 | const char *q; |
31 | unsigned num_digits; |
32 | unsigned r; |
33 | unsigned n; |
34 | unsigned d; |
35 | unsigned base; |
36 | |
37 | num_digits = n = 0; |
38 | base = 8; |
39 | q = *ptr; |
40 | |
41 | #ifdef WANT_HEX_ESCAPES |
42 | if (*q == 'x') { |
43 | ++q; |
44 | base = 16; |
45 | ++num_digits; |
46 | } |
47 | #endif |
48 | |
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. */ |
52 | do { |
53 | d = (unsigned char)(*q) - '0'; |
54 | #ifdef WANT_HEX_ESCAPES |
55 | if (d >= 10) { |
56 | d = (unsigned char)(_tolower(*q)) - 'a' + 10; |
57 | } |
58 | #endif |
59 | |
60 | if (d >= base) { |
61 | #ifdef WANT_HEX_ESCAPES |
62 | if ((base == 16) && (!--num_digits)) { |
63 | /* return '\\'; */ |
64 | --q; |
65 | } |
66 | #endif |
67 | break; |
68 | } |
69 | |
70 | r = n * base + d; |
71 | if (r > UCHAR_MAX) { |
72 | break; |
73 | } |
74 | |
75 | n = r; |
76 | ++q; |
77 | } while (++num_digits < 3); |
78 | |
79 | if (num_digits == 0) { /* mnemonic escape sequence? */ |
80 | p = charmap; |
81 | do { |
82 | if (*p == *q) { |
83 | q++; |
84 | break; |
85 | } |
86 | } while (*++p); |
87 | /* p points to found escape char or NUL, |
88 | * advance it and find what it translates to */ |
89 | p += sizeof(charmap) / 2; |
90 | n = *p; |
91 | } |
92 | |
93 | *ptr = q; |
94 | |
95 | return (char) n; |
96 | } |