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

```asm
<vFrustum>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x18(%rbp)
  mov    %esi,-0x1c(%rbp)
  mov    %edx,-0x20(%rbp)
  mov    %ecx,-0x24(%rbp)
  mov    %r8d,-0x28(%rbp)
  mov    %r9d,-0x2c(%rbp)
  mov    -0x20(%rbp),%edx
  mov    -0x1c(%rbp),%eax
  lea    (%rdx,%rax,1),%ecx
  mov    -0x20(%rbp),%eax
  sub    -0x1c(%rbp),%eax
  mov    %eax,%edi
  mov    %ecx,%eax
  cltd
  idiv   %edi
  mov    %eax,-0x10(%rbp)
  mov    -0x28(%rbp),%edx
  mov    -0x24(%rbp),%eax
  lea    (%rdx,%rax,1),%ecx
  mov    -0x28(%rbp),%eax
  sub    -0x24(%rbp),%eax
  mov    %eax,%esi
  mov    %ecx,%eax
  cltd
  idiv   %esi
  mov    %eax,-0xc(%rbp)
  mov    0x10(%rbp),%edx
  mov    -0x2c(%rbp),%eax
  add    %edx,%eax
  neg    %eax
  mov    %eax,%ecx
  mov    0x10(%rbp),%eax
  sub    -0x2c(%rbp),%eax
  mov    %eax,%edi
  mov    %ecx,%eax
  cltd
  idiv   %edi
  mov    %eax,-0x8(%rbp)
  mov    0x10(%rbp),%eax
  imul   -0x2c(%rbp),%eax
  mov    %eax,%edx
  mov    $0x0,%eax
  sub    %edx,%eax
  add    %eax,%eax
  mov    %eax,%ecx
  mov    0x10(%rbp),%eax
  sub    -0x2c(%rbp),%eax
  mov    %eax,%esi
  mov    %ecx,%eax
  cltd
  idiv   %esi
  mov    %eax,-0x4(%rbp)
  mov    -0x2c(%rbp),%eax
  lea    (%rax,%rax,1),%ecx
  mov    -0x20(%rbp),%eax
  sub    -0x1c(%rbp),%eax
  mov    %eax,%edi
  mov    %ecx,%eax
  cltd
  idiv   %edi
  mov    %eax,%edx
  mov    -0x18(%rbp),%rax
  mov    %edx,(%rax)
  mov    -0x18(%rbp),%rax
  add    $0x10,%rax
  movl   $0x0,(%rax)
  mov    -0x18(%rbp),%rax
  lea    0x20(%rax),%rdx
  mov    -0x10(%rbp),%eax
  mov    %eax,(%rdx)
  mov    -0x18(%rbp),%rax
  add    $0x30,%rax
  movl   $0x0,(%rax)
  mov    -0x18(%rbp),%rax
  add    $0x4,%rax
  movl   $0x0,(%rax)
  mov    -0x2c(%rbp),%eax
  lea    (%rax,%rax,1),%esi
  mov    -0x28(%rbp),%eax
  sub    -0x24(%rbp),%eax
  mov    %eax,%edi
  mov    -0x18(%rbp),%rax
  lea    0x14(%rax),%rcx
  mov    %esi,%eax
  cltd
  idiv   %edi
  mov    %eax,(%rcx)
  mov    -0x18(%rbp),%rax
  lea    0x24(%rax),%rdx
  mov    -0xc(%rbp),%eax
  mov    %eax,(%rdx)
  mov    -0x18(%rbp),%rax
  add    $0x34,%rax
  movl   $0x0,(%rax)
  mov    -0x18(%rbp),%rax
  add    $0x8,%rax
  movl   $0x0,(%rax)
  mov    -0x18(%rbp),%rax
  add    $0x18,%rax
  movl   $0x0,(%rax)
  mov    -0x18(%rbp),%rax
  lea    0x28(%rax),%rdx
  mov    -0x8(%rbp),%eax
  mov    %eax,(%rdx)
  mov    -0x18(%rbp),%rax
  lea    0x38(%rax),%rdx
  mov    -0x4(%rbp),%eax
  mov    %eax,(%rdx)
  mov    -0x18(%rbp),%rax
  add    $0xc,%rax
  movl   $0x0,(%rax)
  mov    -0x18(%rbp),%rax
  add    $0x1c,%rax
  movl   $0x0,(%rax)
  mov    -0x18(%rbp),%rax
  add    $0x2c,%rax
  movl   $0xffffffff,(%rax)
  mov    -0x18(%rbp),%rax
  add    $0x3c,%rax
  movl   $0x0,(%rax)
  nop
  pop    %rbp
  ret
```

assistant: ```c
void vFrustum(GLfloat mMatrix[16], GLfloat nLeft, GLfloat nRight, GLfloat nBottom, GLfloat nTop, GLfloat nNear, GLfloat nFar) {
  GLfloat nA = (nRight + nLeft) / (nRight - nLeft);
  GLfloat nB = (nTop + nBottom) / (nTop - nBottom);
  GLfloat nC = -(nFar + nNear) / (nFar - nNear);
  GLfloat nD = -(2 * nFar * nNear) / (nFar - nNear);
  mMatrix[0] = (2 * nNear) / (nRight - nLeft);
  mMatrix[4] = 0;
  mMatrix[8] = nA;
  mMatrix[12] = 0;
  mMatrix[1] = 0;
  mMatrix[5] = (2 * nNear) / (nTop - nBottom);
  mMatrix[9] = nB;
  mMatrix[13] = 0;
  mMatrix[2] = 0;
  mMatrix[6] = 0;
  mMatrix[10] = nC;
  mMatrix[14] = nD;
  mMatrix[3] = 0;
  mMatrix[7] = 0;
  mMatrix[11] = -1;
  mMatrix[15] = 0;
}
```