user: 请将以下的汇编代码转换成C语言代码:

```asm
<mg_parse_date_string>:
  endbr64
  push   %rbp
  push   %rbx
  sub    $0x58,%rsp
  mov    %rdi,%rbx
  mov    %fs:0x28,%rax
  mov    %rax,0x48(%rsp)
  xor    %eax,%eax
  lea    0x20(%rsp),%rcx
  lea    0x18(%rsp),%rdx
  lea    0xc(%rsp),%rax
  push   %rax
  lea    0x18(%rsp),%rax
  push   %rax
  lea    0x24(%rsp),%r9
  lea    0x2c(%rsp),%r8
  lea    D33(%rip),%rsi
  call   <sscanf@plt>
  add    $0x10,%rsp
  cmp    $0x6,%eax
  jne    L89
L25:
  mov    $0x0,%eax
  cmpl   $0x7b2,0x1c(%rsp)
  jg     L62
L22:
  mov    0x48(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L12
  add    $0x58,%rsp
  pop    %rbx
  pop    %rbp
  ret
L89:
  lea    0x20(%rsp),%rcx
  lea    0x18(%rsp),%rdx
  lea    0xc(%rsp),%rax
  push   %rax
  lea    0x18(%rsp),%rax
  push   %rax
  lea    0x24(%rsp),%r9
  lea    0x2c(%rsp),%r8
  lea    D24(%rip),%rsi
  mov    %rbx,%rdi
  call   <sscanf@plt>
  add    $0x10,%rsp
  cmp    $0x6,%eax
  je     L25
  lea    0x20(%rsp),%rcx
  lea    0x18(%rsp),%rdx
  lea    0xc(%rsp),%rax
  push   %rax
  lea    0x18(%rsp),%rax
  push   %rax
  lea    0x24(%rsp),%r9
  lea    0x2c(%rsp),%r8
  lea    D43(%rip),%rsi
  mov    %rbx,%rdi
  call   <sscanf@plt>
  add    $0x10,%rsp
  cmp    $0x6,%eax
  je     L25
  lea    0x20(%rsp),%rcx
  lea    0x18(%rsp),%rdx
  lea    0xc(%rsp),%rax
  push   %rax
  lea    0x18(%rsp),%rax
  push   %rax
  lea    0x24(%rsp),%r9
  lea    0x2c(%rsp),%r8
  lea    D23(%rip),%rsi
  mov    %rbx,%rdi
  call   <sscanf@plt>
  mov    %eax,%edx
  add    $0x10,%rsp
  mov    $0x0,%eax
  cmp    $0x6,%edx
  jne    L22
  jmp    L25
L62:
  lea    0x20(%rsp),%rdi
  call   <mg_get_month_index@plt>
  mov    %eax,%ebx
  mov    $0x0,%eax
  cmp    $0xffffffff,%ebx
  je     L22
  mov    0x1c(%rsp),%edi
  call   <mg_num_leap_years@plt>
  mov    %eax,%ebp
  mov    $0x7b2,%edi
  call   <mg_num_leap_years@plt>
  mov    %eax,%edx
  mov    0x1c(%rsp),%eax
  sub    $0x7b2,%eax
  imul   $0x16d,%eax,%eax
  movslq %ebx,%rbx
  lea    D40(%rip),%rcx
  movzwl (%rcx,%rbx,2),%ecx
  add    %ecx,%eax
  mov    0x18(%rsp),%ecx
  lea    -0x1(%rax,%rcx,1),%eax
  sub    %edx,%ebp
  add    %ebp,%eax
  imul   $0x15180,%eax,%eax
  imul   $0xe10,0x14(%rsp),%edx
  add    %edx,%eax
  imul   $0x3c,0x10(%rsp),%edx
  add    %edx,%eax
  add    0xc(%rsp),%eax
  jmp    L22
L12:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: tag: D33
data_type: string
name: extract_symbolic_data
arguments: tag: D24
data_type: string
name: extract_symbolic_data
arguments: tag: D43
data_type: string
name: extract_symbolic_data
arguments: tag: D23
data_type: string
name: extract_symbolic_data
arguments: tag: D40
data_type: string

tool: D33: %d/%3s/%d %d:%d:%d

tool: D24: %d %3s %d %d:%d:%d

tool: D43: %*3s, %d %3s %d %d:%d:%d

tool: D23: %d-%3s-%d %d:%d:%d

tool: 

assistant: ```c
time_t mg_parse_date_string(const char *datetime) {
  static const unsigned short days_before_month[] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
  char month_str[32];
  int second, minute, hour, day, month, year, leap_days, days;
  time_t result = (time_t)0;
  if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d", &day, month_str, &year, &hour, &minute, &second) == 6) || (sscanf(datetime, "%d %3s %d %d:%d:%d", &day, month_str, &year, &hour, &minute, &second) == 6) || (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d", &day, month_str, &year, &hour, &minute, &second) == 6) || (sscanf(datetime, "%d-%3s-%d %d:%d:%d", &day, month_str, &year, &hour, &minute, &second) == 6)) && year > 1970 && (month = mg_get_month_index(month_str)) != -1) {
    leap_days = mg_num_leap_years(year) - mg_num_leap_years(1970);
    year -= 1970;
    days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
    result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
  }
  return result;
}
```