user: 请从给定的汇编指令推导出C源代码：

```asm
<stime_darg>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x38(%rbp)
  mov    %rsi,-0x40(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movq   $0x0,-0x10(%rbp)
  movl   $0x0,-0x2c(%rbp)
  mov    -0x40(%rbp),%rax
  movq   $0x0,0x8(%rax)
  movl   $0xffffffff,-0x10(%rbp)
  mov    -0x38(%rbp),%rax
  mov    $0x3a,%esi
  mov    %rax,%rdi
  call   <strchr@plt>
  mov    %rax,-0x20(%rbp)
  cmpq   $0x0,-0x20(%rbp)
  je     L3
  mov    -0x20(%rbp),%rax
  add    $0x1,%rax
  mov    $0x3a,%esi
  mov    %rax,%rdi
  call   <strchr@plt>
  test   %rax,%rax
  je     L3
  mov    -0x38(%rbp),%rax
  mov    $0x54,%esi
  mov    %rax,%rdi
  call   <strchr@plt>
  test   %rax,%rax
  je     L168
  lea    D0(%rip),%rax
  jmp    L156
L168:
  lea    D6(%rip),%rax
L156:
  mov    %rax,-0x18(%rbp)
  lea    -0x10(%rbp),%rdx
  mov    -0x18(%rbp),%rcx
  mov    -0x38(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strptime@plt>
  mov    %rax,-0x28(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  je     L78
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x2e,%al
  je     L32
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x2c,%al
  jne    L107
L32:
  mov    -0x28(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  je     L107
  addq   $0x1,-0x28(%rbp)
  movl   $0x5f5e100,-0x30(%rbp)
  jmp    L37
L5:
  mov    -0x40(%rbp),%rax
  mov    0x8(%rax),%rdx
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  sub    $0x30,%eax
  imul   -0x30(%rbp),%eax
  cltq
  add    %rax,%rdx
  mov    -0x40(%rbp),%rax
  mov    %rdx,0x8(%rax)
  addq   $0x1,-0x28(%rbp)
  mov    -0x30(%rbp),%eax
  movslq %eax,%rdx
  imul   $0x66666667,%rdx,%rdx
  shr    $0x20,%rdx
  sar    $0x2,%edx
  sar    $0x1f,%eax
  mov    %eax,%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  mov    %eax,-0x30(%rbp)
L37:
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L5
L107:
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x5a,%al
  jne    L76
  movl   $0x1,-0x2c(%rbp)
  addq   $0x1,-0x28(%rbp)
L76:
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L20
  cmpl   $0x0,-0x2c(%rbp)
  je     L48
  lea    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <timegm@plt>
  jmp    L34
L48:
  lea    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <mktime@plt>
L34:
  mov    -0x40(%rbp),%rdx
  mov    %eax,(%rdx)
  mov    -0x40(%rbp),%rax
  lea    0x10(%rax),%rcx
  mov    -0x40(%rbp),%rax
  mov    0x8(%rax),%rdx
  mov    (%rax),%rax
  mov    %rax,(%rcx)
  mov    %rdx,0x8(%rcx)
  jmp    L157
L3:
  nop
  jmp    L15
L78:
  nop
  jmp    L15
L20:
  nop
L15:
  lea    D24(%rip),%rax
  mov    %rax,%rsi
  mov    $0x1,%edi
  call   <errx@plt>
L157:
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L94
  call   <__stack_chk_fail@plt>
L94:
  leave
  ret
```

tool_calls: name: retrieve_data
arguments: tag: D0
datatype: string
name: retrieve_data
arguments: tag: D6
datatype: string
name: retrieve_data
arguments: tag: D24
datatype: string

tool: D0: %Y-%m-%dT%H:%M:%S

tool: D6: %Y-%m-%d %H:%M:%S

tool: D24: out of range or illegal time specification: YYYY-MM-DDThh:mm:SS[.frac][tz]

assistant: ```c
void stime_darg(const char *arg, struct timespec *tvp) {
  struct tm t = {.tm_sec = 0};
  const char *fmt, *colon;
  char *p;
  int val, isutc = 0;
  tvp[0].tv_nsec = 0;
  t.tm_isdst = -1;
  colon = strchr(arg, ':');
  if (colon == NULL || strchr(colon + 1, ':') == NULL)
    goto bad;
  fmt = strchr(arg, 'T') != NULL ? "%Y-%m-%dT%H:%M:%S" : "%Y-%m-%d %H:%M:%S";
  p = strptime(arg, fmt, &t);
  if (p == NULL)
    goto bad;
  if ((*p == '.' || *p == ',') && isdigit((unsigned char)p[1])) {
    p++;
    val = 100000000;
    while (isdigit((unsigned char)*p)) {
      tvp[0].tv_nsec += val * (*p - '0');
      p++;
      val /= 10;
    }
  }
  if (*p == 'Z') {
    isutc = 1;
    p++;
  }
  if (*p != '\0')
    goto bad;
  tvp[0].tv_sec = isutc ? timegm(&t) : mktime(&t);
  tvp[1] = tvp[0];
  return;
bad:
  errx(1, "out of range or illegal time specification: YYYY-MM-DDThh:mm:SS[.frac][tz]");
}
```