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stdlib: Clean up and export SDL_UCS4ToUTF8().

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Also fix internal usage of the function.

Fixes #10157.
This commit is contained in:
Ryan C. Gordon
2024-07-04 01:09:46 -04:00
parent f338fa20dd
commit c3bf874abf
9 changed files with 74 additions and 33 deletions
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25
src/SDL_utils.c
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@@ -101,31 +101,6 @@ SDL_bool SDL_endswith(const char *string, const char *suffix)
return SDL_FALSE;
}
char *SDL_UCS4ToUTF8(Uint32 ch, char *dst)
{
Uint8 *p = (Uint8 *)dst;
if (ch <= 0x7F) {
*p = (Uint8)ch;
++dst;
} else if (ch <= 0x7FF) {
p[0] = 0xC0 | (Uint8)((ch >> 6) & 0x1F);
p[1] = 0x80 | (Uint8)(ch & 0x3F);
dst += 2;
} else if (ch <= 0xFFFF) {
p[0] = 0xE0 | (Uint8)((ch >> 12) & 0x0F);
p[1] = 0x80 | (Uint8)((ch >> 6) & 0x3F);
p[2] = 0x80 | (Uint8)(ch & 0x3F);
dst += 3;
} else {
p[0] = 0xF0 | (Uint8)((ch >> 18) & 0x07);
p[1] = 0x80 | (Uint8)((ch >> 12) & 0x3F);
p[2] = 0x80 | (Uint8)((ch >> 6) & 0x3F);
p[3] = 0x80 | (Uint8)(ch & 0x3F);
dst += 4;
}
return dst;
}
/* Assume we can wrap SDL_AtomicInt values and cast to Uint32 */
SDL_COMPILE_TIME_ASSERT(sizeof_object_id, sizeof(int) == sizeof(Uint32));