user: Please show me the C implementation that matches the assembly code listed below:

```asm
<u_link>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x730,%rsp
  mov    %rdi,-0x728(%rbp)
  mov    %rsi,-0x730(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  mov    -0x728(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x2f,%al
  je     L12
  lea    -0x610(%rbp),%rdx
  mov    -0x728(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <relpath_to_abspath@plt>
  jmp    L10
L12:
  mov    -0x728(%rbp),%rcx
  lea    -0x610(%rbp),%rax
  mov    $0x100,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strncpy@plt>
L10:
  lea    -0x710(%rbp),%rcx
  lea    -0x71a(%rbp),%rdx
  lea    -0x71c(%rbp),%rsi
  lea    -0x610(%rbp),%rax
  mov    %rax,%rdi
  call   <get_dev_and_path@plt>
  mov    -0x730(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x2f,%al
  je     L98
  lea    -0x410(%rbp),%rdx
  mov    -0x730(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <relpath_to_abspath@plt>
  jmp    L17
L98:
  mov    -0x730(%rbp),%rcx
  lea    -0x410(%rbp),%rax
  mov    $0x100,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strncpy@plt>
L17:
  lea    -0x210(%rbp),%rdx
  lea    -0x310(%rbp),%rcx
  lea    -0x410(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <splitpath@plt>
  lea    -0x110(%rbp),%rcx
  lea    -0x716(%rbp),%rdx
  lea    -0x718(%rbp),%rsi
  lea    -0x310(%rbp),%rax
  mov    %rax,%rdi
  call   <get_dev_and_path@plt>
  movzwl -0x71c(%rbp),%edx
  movzwl -0x718(%rbp),%eax
  cmp    %ax,%dx
  je     L27
  mov    $0xffffffff,%eax
  jmp    L8
L27:
  movzwl -0x71a(%rbp),%eax
  cmp    $0x1,%ax
  je     L43
  mov    $0xffffffff,%eax
  jmp    L8
L43:
  lea    -0x110(%rbp),%rcx
  lea    -0x510(%rbp),%rax
  mov    $0x100,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strncpy@plt>
  lea    -0x510(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,-0x714(%rbp)
  cmpl   $0x1,-0x714(%rbp)
  jne    L58
  movl   $0x0,-0x714(%rbp)
L58:
  mov    -0x714(%rbp),%eax
  cltq
  movb   $0x2f,-0x510(%rbp,%rax,1)
  mov    -0x714(%rbp),%eax
  cltq
  lea    0x1(%rax),%rdx
  lea    -0x510(%rbp),%rax
  lea    (%rax,%rdx,1),%rcx
  lea    -0x210(%rbp),%rax
  mov    $0x100,%edx
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <strncpy@plt>
  movzwl -0x71c(%rbp),%eax
  cwtl
  lea    -0x510(%rbp),%rdx
  lea    -0x710(%rbp),%rcx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <mx_link@plt>
L8:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L54
  call   <__stack_chk_fail@plt>
L54:
  leave
  ret
```

assistant: ```c
int u_link(const char *path, const char *path2) {
  char localpath[256], abspath[256];
  short device, fs;
  char localpath2[256], abspath2[256];
  short device2, fs2;
  char dir2[256], base2[256], localdir2[256];
  if (*path != '/')
    relpath_to_abspath(path, abspath);
  else
    strncpy(abspath, path, 256);
  get_dev_and_path(abspath, &device, &fs, (char *)&localpath);
  if (*path2 != '/')
    relpath_to_abspath(path2, abspath2);
  else
    strncpy(abspath2, path2, 256);
  splitpath(abspath2, dir2, base2);
  get_dev_and_path(dir2, &device2, &fs2, (char *)&localdir2);
  if (device != device2)
    return -1;
  if (fs != 1)
    return -1;
  strncpy(localpath2, localdir2, 256);
  int len = strlen(localpath2);
  if (len == 1)
    len = 0;
  localpath2[len] = '/';
  strncpy(localpath2 + len + 1, base2, 256);
  return mx_link(device, localpath, localpath2);
}
```