user: 请从给定的汇编指令推导出C源代码：

```asm
<Decode_date_output_format>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %rdi,%r12
  mov    %rsi,%rbx
  mov    %fs:0x28,%rax
  mov    %rax,0x28(%rsp)
  xor    %eax,%eax
  movl   $0x0,0x18(%rsp)
  movq   $0x0,0x20(%rsp)
  mov    $0x10,%edx
  mov    $0x0,%esi
  call   <memset@plt>
  movl   $0xffffffff,(%r12)
  lea    0x20(%rsp),%rcx
  lea    0x18(%rsp),%rdx
  mov    $0x0,%r8d
  mov    %rbx,%rsi
  lea    D9(%rip),%rdi
  call   <Sfile_make_argv@plt>
  mov    %eax,%r13d
  test   %eax,%eax
  jle    L250
  cmpl   $0x1,0x18(%rsp)
  jle    L203
  mov    $0x8,%ebx
  movl   $0x0,0xc(%rsp)
  mov    $0x0,%r15d
  mov    $0x0,%r14d
  mov    $0x0,%r13d
  mov    $0x1,%ebp
  jmp    L169
L115:
  mov    0x20(%rsp),%rax
  mov    (%rax,%rbx,1),%rdi
  mov    $0x0,%esi
  call   <Decode_date_month@plt>
  test   %eax,%eax
  js     L75
  mov    %eax,0x4(%r12)
  mov    $0x1,%r14d
  jmp    L230
L148:
  mov    0x20(%rsp),%rax
  mov    (%rax,%rbx,1),%rdi
  mov    $0x0,%esi
  call   <Decode_date_mday@plt>
  test   %eax,%eax
  jg     L209
  cmp    $0xfffffffe,%eax
  jne    L25
  mov    %r15d,%r13d
  jmp    L250
L209:
  mov    %eax,0x8(%r12)
  mov    $0x1,%r15d
  jmp    L230
L176:
  mov    0x20(%rsp),%rax
  mov    (%rax,%rbx,1),%rdi
  mov    $0x0,%edx
  mov    %r12,%rsi
  call   <Decode_date_hms@plt>
  test   %eax,%eax
  jle    L233
  movl   $0x1,0xc(%rsp)
  jmp    L230
L34:
  mov    0x20(%rsp),%rax
  mov    (%rax,%rbx,1),%rdi
  mov    $0x0,%edx
  mov    %r12,%rsi
  call   <Decode_date_timezone@plt>
  test   %eax,%eax
  js     L154
L230:
  add    $0x1,%ebp
  add    $0x8,%rbx
  cmp    %ebp,0x18(%rsp)
  jle    L165
L169:
  test   %r14d,%r14d
  je     L115
L75:
  test   %r15d,%r15d
  je     L148
L25:
  cmpl   $0x0,0xc(%rsp)
  je     L176
L233:
  test   %r13d,%r13d
  jne    L34
  mov    0x20(%rsp),%rax
  mov    (%rax,%rbx,1),%rdi
  mov    $0x0,%esi
  call   <Decode_date_year@plt>
  test   %eax,%eax
  jle    L34
  sub    $0x76c,%eax
  mov    %eax,0xc(%r12)
  mov    $0x1,%r13d
  jmp    L230
L154:
  mov    0x20(%rsp),%rax
  mov    (%rax,%rbx,1),%rdi
  mov    $0x0,%esi
  call   <Decode_date_weekday@plt>
  test   %eax,%eax
  jns    L230
  mov    $0x0,%r13d
L250:
  lea    0x20(%rsp),%rcx
  lea    0x18(%rsp),%rdx
  mov    $0x2,%r8d
  lea    D3(%rip),%rdi
  mov    %rdi,%rsi
  call   <Sfile_make_argv@plt>
  mov    0x28(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L156
  mov    %r13d,%eax
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L165:
  test   %r15d,%r15d
  je     L106
  test   %r14d,%r14d
  je     L106
  test   %r13d,%r13d
  jne    L250
  mov    $0x0,%edi
  call   <time@plt>
  mov    %eax,0x1c(%rsp)
  lea    0x1c(%rsp),%rdi
  call   <localtime@plt>
  mov    0xc(%rax),%eax
  mov    %eax,0xc(%r12)
  mov    $0x1,%r13d
  jmp    L250
L203:
  mov    $0x0,%r13d
  jmp    L250
L106:
  mov    $0x0,%r13d
  jmp    L250
L156:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: data_tag: D9
datatype: string
name: unpack_data
arguments: data_tag: D3
datatype: string

tool: D9: xorriso

tool: 

assistant: ```c
int Decode_date_output_format(struct tm *erg, char *text, int flag) {
  int ret, i, argc = 0, seen_year = 0, seen_month = 0, seen_day = 0, seen_time = 0;
  char **argv = NULL;
  struct tm *now;
  time_t timep;
  memset(erg, 0, sizeof(*erg));
  erg->tm_isdst = -1;
  ret = Sfile_make_argv("xorriso", text, &argc, &argv, 0);
  if (ret <= 0)
    goto ex;
  for (i = 1; i < argc; i++) {
    if (!seen_month) {
      ret = Decode_date_month(argv[i], 0);
      if (ret >= 0) {
        seen_month = 1;
        erg->tm_mon = ret;
        continue;
      }
    }
    if (!seen_day) {
      ret = Decode_date_mday(argv[i], 0);
      if (ret > 0) {
        seen_day = 1;
        erg->tm_mday = ret;
        continue;
      }
      if (ret == -2) {
        ret = 0;
        goto ex;
      }
    }
    if (!seen_time) {
      ret = Decode_date_hms(argv[i], erg, 0);
      if (ret > 0) {
        seen_time = 1;
        continue;
      }
    }
    if (!seen_year) {
      ret = Decode_date_year(argv[i], 0);
      if (ret > 0) {
        erg->tm_year = ret - 1900;
        seen_year = 1;
        continue;
      }
    }
    ret = Decode_date_timezone(argv[i], erg, 0);
    if (ret >= 0)
      continue;
    ret = Decode_date_weekday(argv[i], 0);
    if (ret >= 0)
      continue;
    {
      ret = 0;
      goto ex;
    }
  }
  if (!(seen_day && seen_month)) {
    ret = 0;
    goto ex;
  }
  if (!seen_year) {
    timep = time(NULL);
    now = localtime(&timep);
    erg->tm_year = now->tm_year;
  }
  ret = 1;
ex:
  Sfile_make_argv("", "", &argc, &argv, 2);
  return (ret);
}
```