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

```asm
<readTriangle>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %rsi,-0x50(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  mov    D18(%rip),%rax
  mov    (%rax),%edx
  mov    -0x48(%rbp),%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <fseek@plt>
  mov    -0x48(%rbp),%rax
  mov    %rax,%rdi
  call   <ftell@plt>
  mov    %eax,-0x2c(%rbp)
  movl   $0x0,-0x3c(%rbp)
  movl   $0x3,-0x38(%rbp)
  mov    -0x50(%rbp),%rax
  movl   $0x0,(%rax)
  mov    -0x2c(%rbp),%eax
  cmp    -0x38(%rbp),%eax
  jl     L17
  jmp    L20
L87:
  mov    -0x38(%rbp),%eax
  add    %eax,-0x3c(%rbp)
  addl   $0x3,-0x38(%rbp)
  mov    -0x50(%rbp),%rax
  mov    (%rax),%eax
  lea    0x1(%rax),%edx
  mov    -0x50(%rbp),%rax
  mov    %edx,(%rax)
L20:
  mov    -0x3c(%rbp),%eax
  cmp    -0x2c(%rbp),%eax
  jl     L87
L17:
  mov    -0x50(%rbp),%rax
  mov    (%rax),%eax
  cltq
  shl    $0x3,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x28(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  jne    L67
  mov    $0x0,%eax
  jmp    L81
L67:
  mov    -0x48(%rbp),%rax
  mov    %rax,%rdi
  call   <rewind@plt>
  movw   $0x0,-0x1b(%rbp)
  movb   $0x0,-0x19(%rbp)
  movl   $0x0,-0x34(%rbp)
  jmp    L82
L34:
  mov    -0x34(%rbp),%eax
  add    $0x1,%eax
  cltq
  shl    $0x2,%eax
  mov    %eax,%edx
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rcx
  mov    -0x28(%rbp),%rax
  lea    (%rcx,%rax,1),%rbx
  mov    %edx,%edi
  call   <malloc@plt>
  mov    %rax,(%rbx)
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  test   %rax,%rax
  jne    L97
  mov    -0x34(%rbp),%edx
  mov    -0x28(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <freeTriangle@plt>
  mov    $0x0,%eax
  jmp    L81
L97:
  movl   $0x0,-0x30(%rbp)
  jmp    L78
L70:
  mov    -0x48(%rbp),%rdx
  lea    -0x1b(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x2,%edx
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <fread@plt>
  cmp    $0x2,%eax
  je     L137
  mov    -0x34(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    -0x28(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <freeTriangle@plt>
  mov    $0x0,%eax
  jmp    L81
L137:
  mov    D10(%rip),%rax
  mov    (%rax),%edx
  mov    -0x48(%rbp),%rax
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <fseek@plt>
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x30(%rbp),%eax
  cltq
  shl    $0x2,%rax
  lea    (%rdx,%rax,1),%rbx
  lea    -0x1b(%rbp),%rax
  mov    %rax,%rdi
  call   <atoi@plt>
  mov    %eax,(%rbx)
  addl   $0x1,-0x30(%rbp)
L78:
  mov    -0x30(%rbp),%eax
  cmp    -0x34(%rbp),%eax
  jle    L70
  addl   $0x1,-0x34(%rbp)
L82:
  mov    -0x50(%rbp),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x34(%rbp)
  jl     L34
  mov    -0x28(%rbp),%rax
L81:
  mov    -0x18(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L2
  call   <__stack_chk_fail@plt>
L2:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
int **readTriangle(FILE *file, int *rows) {
  fseek(file, 0, SEEK_END);
  int length = ftell(file), fileIndex = 0, limit = 3;
  *rows = 0;
  if (length >= limit) {
    while (fileIndex < length) {
      fileIndex += limit;
      limit += 3;
      (*rows)++;
    }
  }
  int **triangle = malloc(sizeof(*triangle) * (*rows));
  if (triangle == NULL) {
    return NULL;
  }
  rewind(file);
  char number[3] = {0};
  int i, j;
  for (i = 0; i < *rows; i++) {
    triangle[i] = malloc(sizeof(**triangle) * (i + 1));
    if (triangle[i] == NULL) {
      freeTriangle(triangle, i);
      return NULL;
    }
    for (j = 0; j <= i; j++) {
      if (fread(number, 1, 2, file) != 2) {
        freeTriangle(triangle, i + 1);
        return NULL;
      }
      fseek(file, 1, SEEK_CUR);
      triangle[i][j] = atoi(number);
    }
  }
  return triangle;
}
```