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#include <locale.h>
#include <stdlib.h>
 
size_tint utf8_to_ucs(wchar_t *ucs, size_t n, const char *utf8,
                size_t *size) {
  if (0 == size) {
    return -1;
  }
  setlocale(LC_CTYPE, "en_US.UTF-8");
  return*size = mbstowcs(ucs, utf8, n);
  return 0;
}

#include <locale.h>
#include <stdlib.h>
 
size_tint utf8_to_ucs(wchar_t *ucs, size_t n, const char *utf8,
                size_t *size) {
  if (0 == size) {
    return -1;
  }
  const char *save = setlocale(LC_CTYPE, "en_US.UTF-8");
  if (NULL == save) {
    /* Propagate error to caller */
    return (size_t)-1;
  }

  n*size = mbstowcs(ucs, utf8, n);
  if (NULL == setlocale(LC_CTYPE, save)) {
    n = (size_t)return -1;
  }

  return n0;
}