#define CHARSET_MAX 41

static
const char *getTok(const char **pp)
{
  enum { inAtom, inString, init, inComment };
  int state = init;
  const char *tokStart = 0;
  for (;;) {
    switch (**pp) {
    case '\0':
      return 0;
    case ' ':
    case '\r':
    case '\t':
    case '\n':
      if (state == inAtom)
	return tokStart;
      break;
    case '(':
      if (state == inAtom)
	return tokStart;
      if (state != inString)
	state++;
      break;
    case ')':
      if (state > init)
	--state;
      else if (state != inString)
	return 0;
      break;
    case ';':
    case '/':
    case '=':
      if (state == inAtom)
	return tokStart;
      if (state == init)
	return (*pp)++;
      break;
    case '\\':
      ++*pp;
      if (**pp == '\0')
	return 0;
      break;
    case '"':
      switch (state) {
      case inString:
	++*pp;
	return tokStart;
      case inAtom:
	return tokStart;
      case init:
	tokStart = *pp;
	state = inString;
	break;
      }
      break;
    default:
      if (state == init) {
	tokStart = *pp;
	state = inAtom;
      }
      break;
    }
    ++*pp;
  }
  /* not reached */
}

/* key must be lowercase ASCII */

static
int matchkey(const char *start, const char *end, const char *key)
{
  if (!start)
    return 0;
  for (; start != end; start++, key++)
    if (*start != *key && *start != 'A' + (*key - 'a'))
      return 0;
  return *key == '\0';
}

void getXMLCharset(const char *buf, char *charset)
{
  const char *next, *p;

  charset[0] = '\0';
  next = buf;
  p = getTok(&next);
  if (matchkey(p, next, "text"))
    strcpy(charset, "us-ascii");
  else if (!matchkey(p, next, "application"))
    return;
  p = getTok(&next);
  if (!p || *p != '/')
    return;
  p = getTok(&next);
  if (matchkey(p, next, "xml"))
    isXml = 1;
  p = getTok(&next);
  while (p) {
    if (*p == ';') {
      p = getTok(&next);
      if (matchkey(p, next, "charset")) {
	p = getTok(&next);
	if (p && *p == '=') {
	  p = getTok(&next);
	  if (p) {
	    char *s = charset;
	    if (*p == '"') {
	      while (++p != next - 1) {
		if (*p == '\\')
		  ++p;
		if (s == charset + CHARSET_MAX - 1) {
		  charset[0] = '\0';
		  break;
		}
		*s++ = *p;
	      }
	      *s++ = '\0';
	    }
	    else {
	      if (next - p > CHARSET_MAX - 1)
		break;
	      while (p != next)
		*s++ = *p++;
	      *s = 0;
	      break;
	    }
	  }
	}
      }
    }
  else
    p = getTok(&next);
  }
}

int main(int argc, char **argv)
{
  char buf[CHARSET_MAX];
  getXMLCharset(argv[1], buf);
  printf("charset = \"%s\"\n", buf);
  return 0;
}
