g_print() fails to print UTF8 string

According to documentation g_print() is supposed to receive UTF8 string and print it. But it does print garbage. The simple printf() prints text correctly.

#include <glib-2.0/glib.h>
#include <stdio.h>

int main() {
  guchar val[] = "яблоко";
  g_print("Fruit is %s\n", val);
  printf("Fruit is %s\n", val);

  printf("sizeof(val)=%ld\n", sizeof(val));
  for(int idx=0; val[idx]; idx++) {
     printf("%02x ", val[idx]);
  }
  printf("\n");

  return 0;
}

The output is:

Fruit is ??????
Fruit is яблоко
sizeof(val)=13
d1 8f d0 b1 d0 bb d0 be d0 ba d0 be

The last two line shows that val array really does have UTF8 string.

Why g_print() prints garbage? What am I missing?

Found a solution, not sure if it is correct one, but it works for me right now.

Apparently, the g_print() does convert UTF8 symbols into question marks if it believes that console is not UTF8 compatible: https://docs.gtk.org/glib/warnings.html#encoding And yes, using setlocale() did solve my problem. Still, not entirely sure why.

Adding to the previous sample this code

  const char *charset;
  g_get_console_charset(&charset);
  g_print("charset = %s\n", charset);

  setlocale(LC_ALL, "");
  g_get_console_charset(&charset);
  g_print("charset = %s\n", charset);

Provided additional output:

charset = ANSI_X3.4-1968
charset = UTF-8

So, my application, at the start, believes that console is using ANSI_X3.4-1968 code page. No idea where this came from. But setlocale(LC_ALL,"") did reset the console expectation to UTF8 - after that g_print() start working properly (and printf() continue to work properly.