user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<main>:
  endbr64
  push   %rbp
  lea    D36(%rip),%rdi
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  lea    D34(%rip),%r13
  push   %r12
  push   %rbx
  sub    $0x38,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  call   <printf@plt>
  lea    -0x3c(%rbp),%rsi
  mov    %r13,%rdi
  call   <scanf@plt>
  movslq -0x3c(%rbp),%rax
  lea    0x0(,%rax,4),%rcx
  mov    %rax,%r8
  imul   %rax,%rax
  mov    %rcx,-0x60(%rbp)
  mov    %rsp,%rcx
  lea    0xf(,%rax,4),%rax
  mov    %rax,%rdx
  and    $0xfffffffffffff000,%rax
  sub    %rax,%rcx
  and    $0xfffffffffffffff0,%rdx
  cmp    %rcx,%rsp
  je     L143
L125:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rcx,%rsp
  jne    L125
L143:
  and    $0xfff,%edx
  sub    %rdx,%rsp
  test   %rdx,%rdx
  jne    L147
L58:
  mov    %rsp,-0x48(%rbp)
  test   %r8d,%r8d
  jle    L169
  mov    -0x60(%rbp),%rax
  movq   $0x0,-0x50(%rbp)
  xor    %r12d,%r12d
  lea    D5(%rip),%r14
  shr    $0x2,%rax
  mov    %rax,-0x58(%rbp)
  nopl   0x0(%rax,%rax,1)
L214:
  mov    -0x48(%rbp),%rax
  mov    -0x50(%rbp),%rcx
  xor    %r15d,%r15d
  lea    (%rax,%rcx,4),%rbx
  nop
L139:
  mov    %r15d,%edx
  mov    %r12d,%esi
  mov    %r14,%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    %rbx,%rsi
  mov    %r13,%rdi
  add    $0x1,%r15d
  call   <scanf@plt>
  mov    -0x3c(%rbp),%r8d
  add    $0x4,%rbx
  cmp    %r15d,%r8d
  jg     L139
  add    $0x1,%r12d
  mov    -0x58(%rbp),%rcx
  add    %rcx,-0x50(%rbp)
  cmp    %r12d,%r8d
  jle    L169
  test   %r8d,%r8d
  jg     L214
L169:
  lea    -0x1(%r8),%eax
  imul   %r8d,%r8d
  mov    %eax,-0x50(%rbp)
  test   %r8d,%r8d
  je     L10
  mov    -0x60(%rbp),%rax
  movl   $0x0,-0x58(%rbp)
  xor    %r15d,%r15d
  xor    %ebx,%ebx
  xor    %r13d,%r13d
  xor    %r12d,%r12d
  xor    %r14d,%r14d
  shr    $0x2,%rax
  mov    %rax,-0x60(%rbp)
  jmp    L206
  nopl   0x0(%rax)
L132:
  cmp    $0x2,%eax
  je     L65
  cmp    $0x3,%eax
  jne    L165
  sub    $0x1,%r14d
L165:
  add    $0x1,%r13d
  lea    0x1(%r15),%eax
  cmp    -0x50(%rbp),%r13d
  je     L73
L191:
  and    $0x1,%eax
  or     -0x58(%rbp),%eax
  mov    %r15d,%eax
  je     L63
L170:
  mov    -0x3c(%rbp),%r8d
  add    $0x1,%ebx
  imul   %r8d,%r8d
  cmp    %ebx,%r8d
  jle    L10
L206:
  movslq %r14d,%rdx
  imul   -0x60(%rbp),%rdx
  mov    -0x48(%rbp),%rcx
  movslq %r12d,%rax
  mov    %r14d,%esi
  lea    D3(%rip),%rdi
  add    %rdx,%rax
  mov    %r12d,%edx
  mov    (%rcx,%rax,4),%r9d
  xor    %eax,%eax
  mov    %ebx,%ecx
  call   <printf@plt>
  mov    %r15d,%eax
  and    $0x3,%eax
  cmp    $0x1,%eax
  adc    $0x0,%r12d
  cmp    $0x1,%eax
  jne    L132
  add    $0x1,%r14d
  add    $0x1,%r13d
  lea    0x1(%r15),%eax
  cmp    -0x50(%rbp),%r13d
  jne    L191
L73:
  and    $0x1,%r15d
  je     L21
  mov    -0x3c(%rbp),%r8d
  add    $0x1,%ebx
  mov    %eax,%r15d
  mov    $0xffffffff,%r13d
  movl   $0x0,-0x58(%rbp)
  imul   %r8d,%r8d
  cmp    %ebx,%r8d
  jg     L206
  nopl   (%rax)
L10:
  mov    $0xa,%edi
  call   <putchar@plt>
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L101
  lea    -0x28(%rbp),%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
  nopw   0x0(%rax,%rax,1)
L65:
  sub    $0x1,%r12d
  jmp    L165
  nopl   0x0(%rax)
L21:
  mov    $0xffffffff,%r13d
L63:
  subl   $0x1,-0x50(%rbp)
  mov    %eax,%r15d
  movl   $0x1,-0x58(%rbp)
  jmp    L170
L147:
  orq    $0x0,-0x8(%rsp,%rdx,1)
  jmp    L58
L101:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: label: D36
type: string
name: disassemble_data
arguments: label: D34
type: string
name: disassemble_data
arguments: label: D5
type: string
name: disassemble_data
arguments: label: D3
type: string

tool: D36: Inserisci dimensione della matrice: 

tool: D34: %d

tool: D5: Inserisci numero [%d:%d]: 

tool: D3: 
[i=%d, k=%d; %d/%d]: %d

assistant: ```c
int main() {
  int i, k, j;
  int size;
  int direction, step, max_step;
  bool changed;
  printf("Inserisci dimensione della matrice: ");
  scanf("%d", &size);
  int matrix[size][size];
  for (i = 0; i < size; i++) {
    for (k = 0; k < size; k++) {
      printf("Inserisci numero [%d:%d]: ", i, k);
      scanf("%d", &matrix[i][k]);
    }
  }
  for (j = 0, i = 0, k = 0, direction = 0, step = 0, max_step = size - 1, changed = false; j < size * size; j++) {
    printf("\n[i=%d, k=%d; %d/%d]: %d", i, k, j, size * size, matrix[i][k]);
    if (direction % 4 == 0)
      k++;
    if (direction % 4 == 1)
      i++;
    if (direction % 4 == 2)
      k--;
    if (direction % 4 == 3)
      i--;
    step++;
    if (step == max_step)
      step = -1, direction++, changed = false;
    if ((direction + 1) % 2 == 0 && !changed)
      max_step--, changed = true;
  }
  printf("\n");
  return 0;
}
```