user: 请从给定的汇编指令推导出C源代码：

```asm
<getstr>:
  endbr64
  push   %r15
  lea    D43(%rip),%rdi
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  movb   $0x51,0x7(%rsp)
  call   <puts@plt>
  cmpb   $0xa,0x7(%rsp)
  je     1120 <getstr.cold>
  xor    %ebx,%ebx
  lea    0x7(%rsp),%r12
  lea    D30(%rip),%r14
  nopl   0x0(%rax)
L30:
  xor    %eax,%eax
  mov    %r12,%rbp
  call   <getchar@plt>
  lea    0x2(%rbx),%edi
  mov    %al,0x7(%rsp)
  call   <malloc@plt>
  mov    %ebx,%esi
  lea    D34(%rip),%rdi
  lea    (%rax,%rbx,1),%r15
  mov    %rax,%r12
  movzbl 0x7(%rsp),%eax
  mov    %al,(%r15)
  xor    %eax,%eax
  call   <printf@plt>
  movsbl 0x7(%rsp),%esi
  mov    %r14,%rdi
  xor    %eax,%eax
  call   <printf@plt>
  movsbl (%r15),%esi
  mov    %r14,%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    D21(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  xor    %eax,%eax
  lea    D54(%rip),%rdi
  call   <printf@plt>
  test   %rbx,%rbx
  jne    L16
  mov    %r12,%rbp
L40:
  add    $0x1,%rbx
  movb   $0x0,(%r12,%rbx,1)
  movsbl 0x0(%rbp),%edi
  test   %dil,%dil
  je     L25
  lea    0x1(%rbp),%r13
  nopl   0x0(%rax)
L12:
  call   <putchar@plt>
  movsbl 0x0(%r13),%edi
  add    $0x1,%r13
  test   %dil,%dil
  jne    L12
L25:
  xor    %eax,%eax
  mov    %rbp,%rsi
  lea    D5(%rip),%rdi
  call   <printf@plt>
  cmpb   $0xa,0x7(%rsp)
  jne    L30
  mov    %rbp,%rdi
  call   <free@plt>
  mov    0x8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L44
  add    $0x18,%rsp
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L16:
  lea    -0x1(%rbx),%ecx
  xor    %eax,%eax
  nopl   (%rax)
L18:
  movzbl 0x0(%rbp,%rax,1),%edx
  mov    %dl,(%r12,%rax,1)
  mov    %rax,%rdx
  add    $0x1,%rax
  cmp    %rcx,%rdx
  jne    L18
  jmp    L40
L44:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: label: D43
datatype: string
name: disassemble_data
arguments: label: D30
datatype: string
name: disassemble_data
arguments: label: D34
datatype: string
name: disassemble_data
arguments: label: D21
datatype: string
name: disassemble_data
arguments: label: D54
datatype: string
name: disassemble_data
arguments: label: D5
datatype: string

tool: D43: Enter String

tool: D30: %c


tool: D34: #%d


tool: D21: BREAK

tool: D54: _BREAK_

tool: D5: 

%s


assistant: ```c
char *getstr(char *input) {
  int n = 0;
  char scanned = 'Q';
  char *ptrTemp;
  char *ptrDel;
  ptrTemp = input = &scanned;
  printf("Enter String\n");
  while (scanned != '\n') {
    scanned = getchar();
    ptrTemp = malloc(sizeof(char) * (n + 2));
    *(ptrTemp + n) = scanned;
    printf("#%d\n", n);
    printf("%c\n", scanned);
    printf("%c\n", *(ptrTemp + n));
    printf("BREAK");
    printf("_BREAK_");
    if (n < 1) {
      input = ptrTemp;
    } else {
      for (int k = 0; k < n; k++) {
        *(ptrTemp + k) = *(input + k);
      }
    }
    *(ptrTemp + 1 + n) = '\0';
    for (int k = 0; *(input + k) != '\0'; k++) {
      printf("%c", *(input + k));
    }
    n++;
    printf("\n\n%s\n", input);
    ptrDel = input;
    input = ptrTemp;
  }
  free(ptrDel);
  return input;
}
```