user: 请将以下的汇编代码转换成C语言代码:

```asm
<stable_grail_merge_buffers_left_with_x_buf>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    %rdx,%r13
  mov    %r8d,%ebx
  mov    %r9d,0x8(%rsp)
  mov    %fs:0x28,%rdx
  mov    %rdx,0x18(%rsp)
  xor    %edx,%edx
  test   %ecx,%ecx
  je     L0
  mov    %rsi,%r14
  mov    %ecx,%eax
  mov    %r8d,0x10(%rsp)
  mov    (%rdi),%rcx
  mov    (%rsi),%rdx
  mov    (%rdx),%esi
  cmp    %esi,(%rcx)
  setge  %dl
  movzbl %dl,%edx
  mov    %edx,0x14(%rsp)
  cmp    $0x1,%eax
  jle    L21
  lea    0x8(%rdi),%rbp
  sub    $0x2,%eax
  mov    %eax,0xc(%rsp)
  mov    %eax,%eax
  lea    0x10(%rdi,%rax,8),%r15
  mov    %r8d,%r12d
  lea    0x14(%rsp),%rax
  mov    %rax,(%rsp)
  jmp    L107
L0:
  mov    %r8d,%ecx
  neg    %ecx
  mov    %r9d,%esi
  imul   %r8d,%esi
  mov    0x60(%rsp),%edx
  mov    %r13,%rdi
  call   <stable_grail_merge_left_with_x_buf@plt>
  jmp    L5
L50:
  cltq
  shl    $0x3,%edx
  lea    0x0(%r13,%rax,8),%rsi
  movslq %ebx,%rcx
  sub    %rcx,%rax
  lea    0x0(%r13,%rax,8),%rdi
  call   <memcpy@plt>
  mov    %ebx,0x10(%rsp)
L124:
  add    %ebx,%r12d
  add    $0x8,%rbp
  cmp    %r15,%rbp
  je     L121
L107:
  mov    0x10(%rsp),%edx
  mov    %r12d,%eax
  sub    %edx,%eax
  mov    0x0(%rbp),%rsi
  mov    (%r14),%rcx
  mov    (%rcx),%edi
  cmp    %edi,(%rsi)
  setge  %cl
  movzbl %cl,%ecx
  cmp    %ecx,0x14(%rsp)
  je     L50
  lea    0x10(%rsp),%rsi
  cltq
  lea    0x0(%r13,%rax,8),%rdi
  mov    %ebx,%r8d
  mov    %ebx,%ecx
  mov    (%rsp),%rdx
  call   <stable_grail_smart_merge_with_x_buf@plt>
  jmp    L124
L121:
  mov    0xc(%rsp),%eax
  imul   %ebx,%eax
  lea    (%rax,%rbx,2),%ebp
L33:
  mov    0x10(%rsp),%edx
  mov    %ebp,%eax
  sub    %edx,%eax
  cmpl   $0x0,0x60(%rsp)
  je     L55
  cmpl   $0x0,0x14(%rsp)
  jne    L109
  mov    0x8(%rsp),%ecx
  imul   %ebx,%ecx
  add    %ecx,%edx
  mov    %edx,0x10(%rsp)
L49:
  neg    %ebx
  mov    %ebx,%ecx
  cltq
  lea    0x0(%r13,%rax,8),%rdi
  mov    0x60(%rsp),%edx
  mov    0x10(%rsp),%esi
  call   <stable_grail_merge_left_with_x_buf@plt>
L5:
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L112
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L21:
  mov    %r8d,%ebp
  jmp    L33
L109:
  cltq
  shl    $0x3,%edx
  lea    0x0(%r13,%rax,8),%rsi
  movslq %ebx,%rcx
  sub    %rcx,%rax
  lea    0x0(%r13,%rax,8),%rdi
  call   <memcpy@plt>
  mov    0x8(%rsp),%eax
  imul   %ebx,%eax
  mov    %eax,0x10(%rsp)
  movl   $0x0,0x14(%rsp)
  mov    %ebp,%eax
  jmp    L49
L55:
  cltq
  shl    $0x3,%edx
  lea    0x0(%r13,%rax,8),%rsi
  movslq %ebx,%rbx
  sub    %rbx,%rax
  lea    0x0(%r13,%rax,8),%rdi
  call   <memcpy@plt>
  jmp    L5
L112:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
void stable_grail_merge_buffers_left_with_x_buf(int **keys, int **midkey, int **arr, int nblock, int lblock, int nblock2, int llast) {
  int l, prest, lrest, frest, pidx, cidx, fnext;
  if (nblock == 0) {
    l = nblock2 * lblock;
    stable_grail_merge_left_with_x_buf(arr, l, llast, -lblock);
    return;
  }
  lrest = lblock;
  frest = (*(*(keys)) - *(*(midkey))) < 0 ? 0 : 1;
  pidx = lblock;
  for (cidx = 1; cidx < nblock; cidx++, pidx += lblock) {
    prest = pidx - lrest;
    fnext = (*(*(keys + cidx)) - *(*(midkey))) < 0 ? 0 : 1;
    if (fnext == frest) {
      memcpy(arr + prest - lblock, arr + prest, lrest * sizeof(int *));
      prest = pidx;
      lrest = lblock;
    } else {
      stable_grail_smart_merge_with_x_buf(arr + prest, &lrest, &frest, lblock, lblock);
    }
  }
  prest = pidx - lrest;
  if (llast) {
    if (frest) {
      memcpy(arr + prest - lblock, arr + prest, lrest * sizeof(int *));
      prest = pidx;
      lrest = lblock * nblock2;
      frest = 0;
    } else {
      lrest += lblock * nblock2;
    }
    stable_grail_merge_left_with_x_buf(arr + prest, lrest, llast, -lblock);
  } else {
    memcpy(arr + prest - lblock, arr + prest, lrest * sizeof(int *));
  }
}
```