CODEWITHSUNDEEP
c
MaMu
MaMu

Reputation: 1869

Saving size_t as unsigned bytes

I have a variable s of type size_t and a variable buffer of type unsigned char. I wish to save this variable in buffer in network order as 4 bytes. How can I do it?

Upvotes: 0

Views: 263

Answers (2)

MOHAMED
MOHAMED

Reputation: 43518

size_t myvar;

myvar = htonl(myvar); // For the endian issues

memcpy(buffer, &myvar, sizeof(size_t));

Upvotes: 2

alk
alk

Reputation: 70931

char c8[8] = {0};
size_t s = 0x1233456789abcdef0, s_be = 0;

if (4 == sizeof(s))
{
  s_be = htonl(s);
}
else if (8 == sizeof(s))
{
  s_be = htobe64(s);
}
else
{
  assert(0);
}

memcpy(c8, &s_be, sizeof(s_be));

For htobe64() have a look here: https://stackoverflow.com/a/4410728/694576

Upvotes: 2

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