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Added SDL_StepBackUTF8()

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This commit is contained in:
Sam Lantinga
2024-10-09 09:43:23 -07:00
parent 1f08a03794
commit f8eac30276
5 changed files with 54 additions and 1 deletions
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20
src/stdlib/SDL_string.c
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@@ -265,6 +265,26 @@ Uint32 SDL_StepUTF8(const char **pstr, size_t *pslen)
return result;
}
Uint32 SDL_StepBackUTF8(const char *start, const char **pstr)
{
if (!pstr || *pstr <= start) {
return 0;
}
// Step back over the previous UTF-8 character
const char *str = *pstr;
do {
if (str == start) {
break;
}
--str;
} while ((*str & 0xC0) == 0x80);
size_t length = (*pstr - str);
*pstr = str;
return StepUTF8(&str, length);
}
#if (SDL_SIZEOF_WCHAR_T == 2)
static Uint32 StepUTF16(const Uint16 **_str, const size_t slen)
{