c6d25d8d |
1 | /* |
2 | * fromucs.c - convert Unicode to other character sets. |
3 | */ |
4 | |
5 | #include "charset.h" |
6 | #include "internal.h" |
7 | |
8 | struct charset_emit_param { |
9 | char *output; |
10 | int outlen; |
11 | int stopped; |
12 | }; |
13 | |
14 | static void charset_emit(void *ctx, long int output) |
15 | { |
16 | struct charset_emit_param *param = (struct charset_emit_param *)ctx; |
17 | |
18 | if (param->outlen > 0) { |
19 | *param->output++ = output; |
20 | param->outlen--; |
21 | } else { |
22 | param->stopped = 1; |
23 | } |
24 | } |
25 | |
26 | int charset_from_unicode(const wchar_t **input, int *inlen, |
27 | char *output, int outlen, |
28 | int charset, charset_state *state, int *error) |
29 | { |
30 | charset_spec const *spec = charset_find_spec(charset); |
31 | charset_state localstate = CHARSET_INIT_STATE; |
32 | struct charset_emit_param param; |
33 | int locallen; |
34 | |
35 | if (!input) { |
36 | locallen = 1; |
37 | inlen = &locallen; |
38 | } |
39 | |
40 | param.output = output; |
41 | param.outlen = outlen; |
42 | param.stopped = 0; |
43 | |
44 | if (state) |
45 | localstate = *state; /* structure copy */ |
46 | if (error) |
47 | *error = FALSE; |
48 | |
49 | while (*inlen > 0) { |
50 | int lenbefore = param.output - output; |
51 | int ret; |
52 | |
53 | if (input) |
54 | ret = spec->write(spec, **input, &localstate, |
55 | charset_emit, ¶m); |
56 | else |
57 | ret = spec->write(spec, -1, &localstate, charset_emit, ¶m); |
58 | if (error && !ret) { |
59 | /* |
60 | * We have hit a difficult character, which the user |
61 | * wants to know about. Leave now. |
62 | */ |
63 | *error = TRUE; |
64 | return lenbefore; |
65 | } |
66 | if (param.stopped) { |
67 | /* |
68 | * The emit function has _tried_ to output some |
69 | * characters, but ran up against the end of the |
70 | * buffer. Leave immediately, and return what happened |
71 | * _before_ attempting to process this character. |
72 | */ |
73 | return lenbefore; |
74 | } |
75 | if (state) |
76 | *state = localstate; /* structure copy */ |
77 | if (input) |
78 | (*input)++; |
79 | (*inlen)--; |
80 | } |
81 | return param.output - output; |
82 | } |