Конвертер символов в юникод

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
 
int main(int argc, char *argv[], char *envp[])
{ FILE *SrcFile;
  FILE *DstFile;
  char ch;
  wchar_t wch;
 
  if(argc > 1)
  { if((SrcFile = fopen("input.txt", "rb")) == NULL) return 1;
    if((DstFile = fopen("output.txt","wb+")) == NULL) return 1;
 
    fputc(0xFF, DstFile);
    fputc(0xFE, DstFile);
 
    while(TRUE)
    { ch = fgetc(SrcFile);
      if(feof(SrcFile)) break;
 
      MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, &ch, 1, &wch, 1);
      fputwc(wch, DstFile);
    }
    fclose(SrcFile);
    fclose(DstFile);
  }
  else { printf("Error"); }
  return 0;
}

#include <stdio.h>
#include <iconv.h>
 
int main(){
  char str[1000];
  char res[1000];
  size_t s_in, s_out;
  iconv_t descr = iconv_open("UTF8", "KOI8-R");
  
  while(fgets(str, 999, stdin) != NULL){
    s_in=999;
    s_out=999;
    char *inp = str;
    char *outp= res;
    iconv(descr, &inp, &s_in, &outp, &s_out);
    puts(res);
  }
  
  iconv_close(descr);
}

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
 
int main()
{
    FILE* src = fopen("input.txt", "rb");
    if(!src) return 0;
 
    FILE* dst = fopen("output.txt", "wb");
    if(!dst) return 0;
 
    fseek(src, 0, SEEK_END);
    long filesize = ftell(src);
    char *ansi = malloc(filesize);
 
    fseek(src, 0, SEEK_SET);
    fread(ansi, 1, filesize, src);
 
    int codepage = CP_ACP;
    int u16size = MultiByteToWideChar(codepage, 0, ansi, filesize, NULL, 0);
    wchar_t *u16 = malloc(u16size * sizeof(wchar_t));
    MultiByteToWideChar(codepage, 0, ansi, filesize, u16, u16size);
 
    int u8size = WideCharToMultiByte(CP_UTF8, 0, u16, u16size, NULL, 0, NULL, FALSE);
    char *u8 = malloc(u8size);
    WideCharToMultiByte(CP_UTF8, 0, u16, u16size, u8, u8size, NULL, FALSE);
 
    fwrite(u8, 1, u8size, dst);
    return 0;
}