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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; |
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11 | int writtenlen; |
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12 | int stopped; |
13 | }; |
14 | |
15 | static void charset_emit(void *ctx, long int output) |
16 | { |
17 | struct charset_emit_param *param = (struct charset_emit_param *)ctx; |
18 | |
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19 | if (param->outlen != 0) { |
20 | if (param->output) |
21 | *param->output++ = output; |
22 | if (param->outlen > 0) |
23 | param->outlen--; |
24 | param->writtenlen++; |
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25 | } else { |
26 | param->stopped = 1; |
27 | } |
28 | } |
29 | |
30 | int charset_from_unicode(const wchar_t **input, int *inlen, |
31 | char *output, int outlen, |
32 | int charset, charset_state *state, int *error) |
33 | { |
34 | charset_spec const *spec = charset_find_spec(charset); |
35 | charset_state localstate = CHARSET_INIT_STATE; |
36 | struct charset_emit_param param; |
37 | int locallen; |
38 | |
39 | if (!input) { |
40 | locallen = 1; |
41 | inlen = &locallen; |
42 | } |
43 | |
44 | param.output = output; |
45 | param.outlen = outlen; |
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46 | param.writtenlen = 0; |
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47 | param.stopped = 0; |
48 | |
49 | if (state) |
50 | localstate = *state; /* structure copy */ |
51 | if (error) |
52 | *error = FALSE; |
53 | |
54 | while (*inlen > 0) { |
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55 | int lenbefore = param.writtenlen; |
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56 | int ret; |
57 | |
58 | if (input) |
59 | ret = spec->write(spec, **input, &localstate, |
60 | charset_emit, ¶m); |
61 | else |
62 | ret = spec->write(spec, -1, &localstate, charset_emit, ¶m); |
63 | if (error && !ret) { |
64 | /* |
65 | * We have hit a difficult character, which the user |
66 | * wants to know about. Leave now. |
67 | */ |
68 | *error = TRUE; |
69 | return lenbefore; |
70 | } |
71 | if (param.stopped) { |
72 | /* |
73 | * The emit function has _tried_ to output some |
74 | * characters, but ran up against the end of the |
75 | * buffer. Leave immediately, and return what happened |
76 | * _before_ attempting to process this character. |
77 | */ |
78 | return lenbefore; |
79 | } |
80 | if (state) |
81 | *state = localstate; /* structure copy */ |
82 | if (input) |
83 | (*input)++; |
84 | (*inlen)--; |
85 | } |
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86 | return param.writtenlen; |
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87 | } |