How to use UTF-8 in C code?

Question

My setup: gcc-4.9.2, UTF-8 environment.

The following C-program works in ASCII, but does not in UTF-8.

Create input file:

echo -n \'привет мир\'          


        

Answer 1

The following code works as required:

#include 
#include 
#include 
#include 

#define SIZE 10

int main(void)
{
  setlocale(LC_ALL, "");
  wchar_t buf[SIZE+1];
  wchar_t *pat = L"привет мир";
  wchar_t str[SIZE+2];

  FILE *f1;
  FILE *f2;

  f1 = fopen("/tmp/вход","r");
  f2 = fopen("/tmp/выход","w");

  fgetws(buf, SIZE+1, f1);

  if (wcsncmp(buf, pat, SIZE) == 0) {
    swprintf(str, SIZE+2, L"% 11ls", buf);
    fputws(str, f2);
  }

  fclose(f1);
  fclose(f2);

  exit(0);
}