взял linux.org.ru
static void cp1251_to_utf8(char *out, const char *in) {
static const int table[128] = {
0x82D0,0x83D0,0x9A80E2,0x93D1,0x9E80E2,0xA680E2,0xA080E2,0xA180E2,
0xAC82E2,0xB080E2,0x89D0,0xB980E2,0x8AD0,0x8CD0,0x8BD0,0x8FD0,
0x92D1,0x9880E2,0x9980E2,0x9C80E2,0x9D80E2,0xA280E2,0x9380E2,0x9480E2,
0,0xA284E2,0x99D1,0xBA80E2,0x9AD1,0x9CD1,0x9BD1,0x9FD1,
0xA0C2,0x8ED0,0x9ED1,0x88D0,0xA4C2,0x90D2,0xA6C2,0xA7C2,
0x81D0,0xA9C2,0x84D0,0xABC2,0xACC2,0xADC2,0xAEC2,0x87D0,
0xB0C2,0xB1C2,0x86D0,0x96D1,0x91D2,0xB5C2,0xB6C2,0xB7C2,
0x91D1,0x9684E2,0x94D1,0xBBC2,0x98D1,0x85D0,0x95D1,0x97D1,
0x90D0,0x91D0,0x92D0,0x93D0,0x94D0,0x95D0,0x96D0,0x97D0,
0x98D0,0x99D0,0x9AD0,0x9BD0,0x9CD0,0x9DD0,0x9ED0,0x9FD0,
0xA0D0,0xA1D0,0xA2D0,0xA3D0,0xA4D0,0xA5D0,0xA6D0,0xA7D0,
0xA8D0,0xA9D0,0xAAD0,0xABD0,0xACD0,0xADD0,0xAED0,0xAFD0,
0xB0D0,0xB1D0,0xB2D0,0xB3D0,0xB4D0,0xB5D0,0xB6D0,0xB7D0,
0xB8D0,0xB9D0,0xBAD0,0xBBD0,0xBCD0,0xBDD0,0xBED0,0xBFD0,
0x80D1,0x81D1,0x82D1,0x83D1,0x84D1,0x85D1,0x86D1,0x87D1,
0x88D1,0x89D1,0x8AD1,0x8BD1,0x8CD1,0x8DD1,0x8ED1,0x8FD1
};
while (*in)
if (*in & 0x80) {
int v = table[(int)(0x7f & *in++)];
if (!v)
continue;
*out++ = (char)v;
*out++ = (char)(v >> 8);
if (v >>= 16)
*out++ = (char)v;
}
else
*out++ = *in++;
*out = 0;
}
int main()
{
FILE *file;
unsigned long fsize;
char *buffer, *cp1251;
file = fopen("in.html", "r");
fseek(file, 0, SEEK_END);
fsize = ftell(file);
rewind(file);
cp1251 = new char[fsize + 4];
buffer = new char[fsize*2 + 4];
fread(cp1251, 1, fsize, file);
cp1251_to_utf8(buffer, cp1251);
buffer[fsize] = 0;
cp1251[fsize] = 0;
printf("cp1251:\n\n\n%s\n*****\nutf-8:\n\n\n\n%s", cp1251, buffer);
delete[] buffer;
delete[] cp1251;
fclose(file);
return 0;
}