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392be3e494
We already had encode_wide_string_as_utf8, which treats the wide string as UTF-16 or UTF-32 as appropriate to the size of wchar_t. I'm about to need the inverse function, and was surprised that it didn't already exist (even though enough component parts did to make it easy).
36 lines
1019 B
C
36 lines
1019 B
C
/*
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* Decode a string of UTF-8 to a wchar_t string.
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*/
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#include "misc.h"
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wchar_t *decode_utf8_to_wide_string(const char *s)
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{
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wchar_t *ws = NULL;
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size_t wlen = 0, wsize = 0;
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BinarySource src[1];
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BinarySource_BARE_INIT_PL(src, ptrlen_from_asciz(s));
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while (get_avail(src) > 0) {
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/*
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* decode_utf8_to_wchar might emit up to 2 wchar_t if wchar_t
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* is 16 bits (because of UTF-16 surrogates), but will emit at
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* most one if wchar_t is 32-bit
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*/
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sgrowarrayn(ws, wsize, wlen, 1 + (sizeof(wchar_t) < 4));
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/* We ignore 'err': if it is set, then the character decode
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* function will have emitted U+FFFD REPLACEMENT CHARACTER,
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* which is what we'd have done in response anyway. */
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DecodeUTF8Failure err;
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wlen += decode_utf8_to_wchar(src, ws + wlen, &err);
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}
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/* Reallocate to the final size and append the trailing NUL */
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ws = sresize(ws, wlen + 1, wchar_t);
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ws[wlen] = L'\0';
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return ws;
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}
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