blob: 9a423431e64a9d71ace87ccd1fb2c2df454131d9
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * Copyright (C) 2007 Denys Vlasenko |
6 | * |
7 | * Licensed under GPLv2, see file LICENSE in this source tree. |
8 | */ |
9 | |
10 | #include "libbb.h" |
11 | |
12 | void FAST_FUNC fputc_printable(int ch, FILE *file) |
13 | { |
14 | if ((ch & (0x80 + PRINTABLE_META)) == (0x80 + PRINTABLE_META)) { |
15 | fputs("M-", file); |
16 | ch &= 0x7f; |
17 | } |
18 | ch = (unsigned char) ch; |
19 | if (ch == 0x9b) { |
20 | /* VT100's CSI, aka Meta-ESC, is not printable on vt-100 */ |
21 | ch = '{'; |
22 | goto print_caret; |
23 | } |
24 | if (ch < ' ') { |
25 | ch += '@'; |
26 | goto print_caret; |
27 | } |
28 | if (ch == 0x7f) { |
29 | ch = '?'; |
30 | print_caret: |
31 | fputc('^', file); |
32 | } |
33 | fputc(ch, file); |
34 | } |
35 | |
36 | void FAST_FUNC visible(unsigned ch, char *buf, int flags) |
37 | { |
38 | if (ch == '\t' && !(flags & VISIBLE_SHOW_TABS)) { |
39 | goto raw; |
40 | } |
41 | if (ch == '\n') { |
42 | if (flags & VISIBLE_ENDLINE) |
43 | *buf++ = '$'; |
44 | } else { |
45 | if (ch >= 128) { |
46 | ch -= 128; |
47 | *buf++ = 'M'; |
48 | *buf++ = '-'; |
49 | } |
50 | if (ch < 32 || ch == 127) { |
51 | *buf++ = '^'; |
52 | ch ^= 0x40; |
53 | } |
54 | } |
55 | raw: |
56 | *buf++ = ch; |
57 | *buf = '\0'; |
58 | } |
59 |