user: 请将以下的汇编代码转换成C语言代码：

```asm
<longdivision>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x58,%rsp
  mov    %rdi,%r15
  mov    %rsi,%r14
  mov    %rdx,0x8(%rsp)
  mov    %rcx,%r12
  mov    %r8,0x18(%rsp)
  mov    %r9d,0x20(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0x48(%rsp)
  xor    %eax,%eax
  movl   $0x0,0x3c(%rsp)
  movl   $0x0,0x40(%rsp)
  movl   $0x0,0x44(%rsp)
  cmpb   $0x1,(%rdi)
  je     L16
  movb   $0x0,(%rcx)
  movb   $0x0,0x1(%rcx)
  mov    %rdi,%rax
  mov    $0x0,%r13d
L6:
  cmpb   $0x0,(%rax)
  jne    L7
  add    $0x1,%r13d
  add    $0x1,%rax
  cmp    $0x5,%r13d
  jne    L6
L7:
  mov    %r14,%rax
  mov    $0x0,%ebp
L96:
  cmpb   $0x0,(%rax)
  jne    L153
  add    $0x1,%ebp
  add    $0x1,%rax
  cmp    $0x5,%ebp
  jne    L96
  movzbl 0x5(%r14),%edi
  call   <miLookup@plt>
  movzbl %al,%edi
  mov    %edi,0x24(%rsp)
  movslq %r13d,%rax
  movzbl (%r15,%rax,1),%esi
  call   <bd@plt>
  mov    %al,0x2(%r12)
  jmp    L38
L16:
  movb   $0x0,(%rcx)
  movb   $0x0,0x1(%rcx)
  movzbl 0x1(%rsi),%edi
  call   <miLookup@plt>
  mov    %eax,%r13d
  mov    $0x0,%ebx
  movzbl %al,%ebp
L24:
  movzbl 0x2(%r14,%rbx,1),%esi
  mov    %ebp,%edi
  call   <bd@plt>
  mov    %al,0x3c(%rsp,%rbx,1)
  add    $0x1,%rbx
  cmp    $0x3,%rbx
  jne    L24
  movzbl 0x4(%r15),%eax
  mov    %al,0x3f(%rsp)
  mov    %r13b,0x2(%r12)
  movzbl 0x3c(%rsp),%esi
  mov    %ebp,%edi
  call   <bd@plt>
  mov    %al,0x3(%r12)
  mov    $0x1,%ebx
  movzbl %al,%ebp
L39:
  movzbl (%r14,%rbx,1),%esi
  mov    %ebp,%edi
  call   <bd@plt>
  mov    %al,0x3f(%rsp,%rbx,1)
  add    $0x1,%rbx
  cmp    $0x5,%rbx
  jne    L39
  mov    0x8(%rsp),%rax
  movb   $0x0,(%rax)
  mov    $0x0,%eax
  lea    0x40(%rsp),%rcx
L25:
  movzbl 0x3c(%rsp,%rax,1),%edx
  xor    (%rax,%rcx,1),%dl
  mov    0x8(%rsp),%rsi
  mov    %dl,0x1(%rsi,%rax,1)
  add    $0x1,%rax
  cmp    $0x4,%rax
  jne    L25
  movslq 0x20(%rsp),%rbp
  shl    $0x2,%rbp
  mov    0x18(%rsp),%r14
  lea    (%r14,%rbp,1),%rbx
  lea    0x44(%rsp),%rdx
  mov    %r12,%rsi
  mov    %rbx,%rdi
  call   <modprod@plt>
  lea    0x4(%r14,%rbp,1),%rsi
  mov    $0x0,%eax
  lea    0x44(%rsp),%rcx
L58:
  movzbl -0x4(%rbx,%rax,1),%edx
  xor    (%rax,%rcx,1),%dl
  mov    %dl,(%rsi,%rax,1)
  add    $0x1,%rax
  cmp    $0x4,%rax
  jne    L58
  jmp    L176
L153:
  movslq %ebp,%rax
  mov    %rax,0x10(%rsp)
  movzbl (%r14,%rax,1),%edi
  call   <miLookup@plt>
  movslq %r13d,%rcx
  movzbl %al,%edi
  mov    %edi,0x24(%rsp)
  mov    %rcx,0x28(%rsp)
  movzbl (%r15,%rcx,1),%esi
  call   <bd@plt>
  mov    %al,0x2(%r12)
  lea    -0x1(%r13),%ebx
  mov    $0x4,%eax
  sub    %ebp,%eax
  lea    (%rax,%r13,1),%edi
  mov    %edi,0x4(%rsp)
  js     L38
  movslq %ebx,%rbx
  mov    %rbx,%rbp
  mov    0x10(%rsp),%rax
  sub    0x28(%rsp),%rax
  add    %r14,%rax
  mov    %rax,0x10(%rsp)
L2:
  mov    0x10(%rsp),%rax
  movzbl 0x1(%rax,%rbp,1),%esi
  movzbl 0x2(%r12),%edi
  call   <bd@plt>
  mov    %al,0x3c(%rsp,%rbp,1)
  add    $0x1,%rbp
  cmp    %ebp,0x4(%rsp)
  jg     L2
  lea    0x3c(%rsp),%rdx
L66:
  movzbl 0x1(%r15,%rbx,1),%eax
  xor    (%rbx,%rdx,1),%al
  mov    %al,0x40(%rsp,%rbx,1)
  add    $0x1,%rbx
  cmp    %ebx,0x4(%rsp)
  jg     L66
L38:
  movzbl 0x4(%r15),%eax
  mov    %al,0x43(%rsp)
  movslq %r13d,%r13
  movzbl 0x40(%rsp,%r13,1),%esi
  mov    0x24(%rsp),%edi
  call   <bd@plt>
  mov    %al,0x3(%r12)
  mov    $0x1,%ebx
  lea    0x3b(%rsp),%rbp
L149:
  movzbl (%r14,%rbx,1),%esi
  movzbl 0x3(%r12),%edi
  call   <bd@plt>
  mov    %al,0x0(%rbp,%rbx,1)
  add    $0x1,%rbx
  cmp    $0x5,%rbx
  jne    L149
  mov    0x8(%rsp),%rax
  movb   $0x0,(%rax)
  mov    $0x0,%eax
  lea    0x40(%rsp),%rcx
L112:
  movzbl 0x3c(%rsp,%rax,1),%edx
  xor    (%rax,%rcx,1),%dl
  mov    0x8(%rsp),%rdi
  mov    %dl,0x1(%rdi,%rax,1)
  add    $0x1,%rax
  cmp    $0x4,%rax
  jne    L112
  movslq 0x20(%rsp),%rbp
  shl    $0x2,%rbp
  mov    0x18(%rsp),%r15
  lea    (%r15,%rbp,1),%rbx
  lea    0x44(%rsp),%rdx
  mov    %r12,%rsi
  mov    %rbx,%rdi
  call   <modprod@plt>
  lea    0x4(%r15,%rbp,1),%rsi
  mov    $0x0,%eax
  lea    0x44(%rsp),%rcx
L106:
  movzbl -0x4(%rbx,%rax,1),%edx
  xor    (%rax,%rcx,1),%dl
  mov    %dl,(%rsi,%rax,1)
  add    $0x1,%rax
  cmp    $0x4,%rax
  jne    L106
L176:
  mov    0x48(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L80
  add    $0x58,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L80:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
void longdivision(unsigned char a[5], unsigned char b[5], unsigned char dest[5], unsigned char quo[4], unsigned char x[6][4], int round) {
  int i, j;
  int index_a;
  int index_b;
  unsigned char inv;
  unsigned char prod[4] = {0, 0, 0, 0};
  unsigned char temp[4] = {0, 0, 0, 0};
  unsigned char tempx[4] = {0, 0, 0, 0};
  if (a[0] == 1) {
    quo[0] = 0;
    quo[1] = 0;
    inv = miLookup(b[1]);
    for (i = 0; i < 3; i++) {
      prod[i] = bd(inv, b[i + 2]);
    }
    prod[3] = a[4];
    quo[2] = inv;
    inv = bd(inv, prod[0]);
    quo[3] = inv;
    for (i = 0; i < 4; i++) {
      temp[i] = bd(inv, b[i + 1]);
    }
    dest[0] = 0x0;
    for (i = 0; i < 4; i++) {
      dest[i + 1] = prod[i] ^ temp[i];
    }
    modprod(x[round], quo, tempx);
    for (i = 0; i < 4; i++) {
      x[round + 1][i] = x[round - 1][i] ^ tempx[i];
    }
  } else {
    quo[0] = 0;
    quo[1] = 0;
    for (index_a = 0; index_a < 5; index_a++) {
      if (a[index_a] != 0) {
        break;
      }
    }
    for (index_b = 0; index_b < 5; index_b++) {
      if (b[index_b] != 0x0) {
        break;
      }
    }
    inv = miLookup(b[index_b]);
    quo[2] = bd(inv, a[index_a]);
    j = 0;
    for (i = index_a - 1; i < 4 - index_b + index_a; i++, j++) {
      prod[i] = bd(quo[2], b[index_b + j]);
    }
    j = 0;
    for (i = index_a - 1; i < 4 - index_b + index_a; i++, j++) {
      temp[i] = a[index_a + j] ^ prod[i];
    }
    temp[3] = a[4];
    quo[3] = bd(inv, temp[index_a]);
    for (i = 0; i < 4; i++) {
      prod[i] = bd(quo[3], b[i + 1]);
    }
    dest[0] = 0x0;
    for (i = 0; i < 4; i++) {
      dest[i + 1] = prod[i] ^ temp[i];
    }
    modprod(x[round], quo, tempx);
    for (i = 0; i < 4; i++) {
      x[round + 1][i] = x[round - 1][i] ^ tempx[i];
    }
  }
}
```