cpython/Modules/expat/xmltok_ns.c

const ENCODING *NS(XmlGetUtf8InternalEncoding)(void)
{
  return &ns(internal_utf8_encoding).enc;
}

const ENCODING *NS(XmlGetUtf16InternalEncoding)(void)
{
#if XML_BYTE_ORDER == 12
  return &ns(internal_little2_encoding).enc;
#elif XML_BYTE_ORDER == 21
  return &ns(internal_big2_encoding).enc;
#else
  const short n = 1;
  return *(const char *)&n ? &ns(internal_little2_encoding).enc : &ns(internal_big2_encoding).enc;
#endif
}

static
const ENCODING *NS(encodings)[] = {
  &ns(latin1_encoding).enc,
  &ns(ascii_encoding).enc,
  &ns(utf8_encoding).enc,
  &ns(big2_encoding).enc,
  &ns(big2_encoding).enc,
  &ns(little2_encoding).enc,
  &ns(utf8_encoding).enc /* NO_ENC */
};

static
int NS(initScanProlog)(const ENCODING *enc, const char *ptr, const char *end,
		       const char **nextTokPtr)
{
  return initScan(NS(encodings), (const INIT_ENCODING *)enc, XML_PROLOG_STATE, ptr, end, nextTokPtr);
}

static
int NS(initScanContent)(const ENCODING *enc, const char *ptr, const char *end,
		       const char **nextTokPtr)
{
  return initScan(NS(encodings), (const INIT_ENCODING *)enc, XML_CONTENT_STATE, ptr, end, nextTokPtr);
}

int NS(XmlInitEncoding)(INIT_ENCODING *p, const ENCODING **encPtr, const char *name)
{
  int i = getEncodingIndex(name);
  if (i == UNKNOWN_ENC)
    return 0;
  SET_INIT_ENC_INDEX(p, i);
  p->initEnc.scanners[XML_PROLOG_STATE] = NS(initScanProlog);
  p->initEnc.scanners[XML_CONTENT_STATE] = NS(initScanContent);
  p->initEnc.updatePosition = initUpdatePosition;
  p->encPtr = encPtr;
  *encPtr = &(p->initEnc);
  return 1;
}

static
const ENCODING *NS(findEncoding)(const ENCODING *enc, const char *ptr, const char *end)
{
#define ENCODING_MAX 128
  char buf[ENCODING_MAX];
  char *p = buf;
  int i;
  XmlUtf8Convert(enc, &ptr, end, &p, p + ENCODING_MAX - 1);
  if (ptr != end)
    return 0;
  *p = 0;
  if (streqci(buf, KW_UTF_16) && enc->minBytesPerChar == 2)
    return enc;
  i = getEncodingIndex(buf);
  if (i == UNKNOWN_ENC)
    return 0;
  return NS(encodings)[i];
}

int NS(XmlParseXmlDecl)(int isGeneralTextEntity,
			const ENCODING *enc,
			const char *ptr,
			const char *end,
			const char **badPtr,
			const char **versionPtr,
			const char **versionEndPtr,
			const char **encodingName,
			const ENCODING **encoding,
			int *standalone)
{
  return doParseXmlDecl(NS(findEncoding),
			isGeneralTextEntity,
			enc,
			ptr,
			end,
			badPtr,
			versionPtr,
			versionEndPtr,
			encodingName,
			encoding,
			standalone);
}