user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<getmodifiedtime>:
  endbr64
  add    $0x4d58,%rdi
  push   %r14
  movabs $0x8888888888888889,%rsi
  mov    %rdi,%rax
  push   %r13
  mul    %rsi
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdx,%rdi
  shr    $0x5,%rdi
  mov    %rdi,%rax
  mul    %rsi
  mov    %rdx,%r12
  mov    %rdx,%rsi
  movabs $0xaaaaaaaaaaaaaaab,%rdx
  shr    $0x5,%r12
  shr    $0x5,%rsi
  mov    %r12,%rax
  shl    $0x4,%rax
  sub    %r12,%rax
  shl    $0x2,%rax
  sub    %rax,%rdi
  mov    %rsi,%rax
  mul    %rdx
  mov    %rdi,%r12
  shr    $0x4,%rdx
  lea    (%rdx,%rdx,2),%rax
  mov    %rdx,%rcx
  movabs $0xb36d8397914268c9,%rdx
  shl    $0x3,%rax
  sub    %rax,%rsi
  mov    %rcx,%rax
  mul    %rdx
  mov    %rcx,%rax
  mov    %rsi,%r13
  shr    $0xa,%rdx
  lea    0x0(,%rdx,4),%rdi
  imul   $0x5b5,%rdx,%rdx
  sub    %rdx,%rax
  cmp    $0x447,%rax
  ja     L106
  cmp    $0x2da,%rax
  ja     L221
  xor    %r8d,%r8d
  cmp    $0x16d,%rax
  lea    D4(%rip),%r9
  seta   %r8b
  lea    (%r8,%r8,2),%rdx
  movzwl 0x16(%r9,%rdx,8),%esi
L136:
  lea    (%r8,%r8,2),%rdx
  mov    $0xb,%ecx
  lea    (%r9,%rdx,8),%rdx
  jmp    L93
  nopl   (%rax)
L29:
  movzwl (%rdx,%rcx,2),%esi
L93:
  cmp    %rax,%rsi
  jbe    L44
  sub    $0x1,%rcx
  jne    L29
  lea    0x1(%rax),%rbp
  lea    (%r8,%r8,2),%rax
  add    %r8,%rdi
  mov    $0x1,%r14d
  movzwl (%r9,%rax,8),%eax
  sub    %rax,%rbp
  cmp    $0x1f,%rbp
  je     L112
  xor    %ebx,%ebx
  nopl   0x0(%rax)
L170:
  cmp    $0x2,%r14
  jne    L113
L265:
  call   <checkleap@plt>
  cmp    $0x1,%eax
  je     L81
  cmp    $0x1c,%rbp
  jne    L113
L63:
  mov    $0x3,%r14d
  jmp    L191
  nopl   0x0(%rax)
L44:
  sub    %rsi,%rax
  add    %r8,%rdi
  lea    0x1(%rcx),%r14
  lea    0x1(%rax),%rbp
  test   $0xfffffffffffffffd,%rcx
  je     L128
  mov    $0xad0,%eax
  bt     %rcx,%rax
  jae    L253
L128:
  cmp    $0x1f,%rbp
  jne    L253
  lea    0x2(%rcx),%r14
  sub    $0x2,%rcx
  test   $0xfffffffffffffffd,%rcx
  je     L191
  jmp    L87
  nopw   0x0(%rax,%rax,1)
L253:
  mov    %r14,%rax
  and    $0xfffffffffffffffd,%rax
  cmp    $0x4,%rax
  jne    L83
L208:
  xor    %ebx,%ebx
  cmp    $0x1e,%rbp
  je     L220
L231:
  cmp    $0x2,%r14
  je     L265
L113:
  cmp    $0x1,%ebx
  adc    $0x0,%rbp
L100:
  mov    %r14,%rdi
  call   <getmonth@plt>
  mov    %rbp,%rdi
  call   <getdate@plt>
  mov    %r13,%rdi
  call   <gethours@plt>
  mov    $0x1,%edi
  mov    $0x1,%edx
  lea    D26(%rip),%rsi
  call   <write@plt>
  pop    %rbx
  mov    %r12,%rdi
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  jmp    10f0 <getminute@plt>
L83:
  cmp    $0x9,%rax
  je     L208
  xor    %ebx,%ebx
  jmp    L170
  nopl   0x0(%rax)
L220:
  add    $0x1,%r14
  cmp    $0x2,%r14
  je     L218
L191:
  mov    $0x1,%ebp
  jmp    L100
  nopl   0x0(%rax)
L112:
  mov    $0x2,%r14d
L87:
  mov    $0x1,%ebx
  mov    $0x1,%ebp
  jmp    L231
L106:
  mov    $0x596,%esi
  mov    $0x3,%r8d
  lea    D4(%rip),%r9
  jmp    L136
L221:
  mov    $0x429,%esi
  mov    $0x2,%r8d
  lea    D4(%rip),%r9
  jmp    L136
L218:
  call   <checkleap@plt>
  mov    $0x1,%ebp
  jmp    L100
L81:
  cmp    $0x1d,%rbp
  je     L63
  jmp    L113
```

tool_calls: name: unpack_data
arguments: label: D4
type: string
name: unpack_data
arguments: label: D26
type: string

tool: 

tool: D26: :

assistant: ```c
void getmodifiedtime(unsigned long epoch) {
  epoch += 19800;
  unsigned long second;
  unsigned long minute;
  unsigned long hour;
  unsigned long day;
  unsigned long month;
  unsigned long year;
  const static unsigned short days[4][12] = {
      {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335},
      {366, 397, 425, 456, 486, 517, 547, 578, 609, 639, 670, 700},
      {731, 762, 790, 821, 851, 882, 912, 943, 974, 1004, 1035, 1065},
      {1096, 1127, 1155, 1186, 1216, 1247, 1277, 1308, 1339, 1369, 1400, 1430},
  };
  second = epoch % 60;
  epoch /= 60;
  minute = epoch % 60;
  epoch /= 60;
  hour = epoch % 24;
  epoch /= 24;
  unsigned long years = epoch / (365 * 4 + 1) * 4;
  epoch %= 365 * 4 + 1;
  for (year = 3; year > 0; year--) {
    if (epoch >= days[year][0])
      break;
  }
  for (month = 11; month > 0; month--) {
    if (epoch >= days[year][month])
      break;
  }
  int ch = 0;
  day = epoch - days[year][month] + 1;
  year = years + year;
  month = month + 1;
  if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
    if (day == 31) {
      ch = 1;
      day = 1;
      month += 1;
    }
  }
  if (month == 4 || month == 6 || month == 9 || month == 11) {
    if (day == 30) {
      ch = 1;
      day = 1;
      month += 1;
    }
  }
  if (month == 2) {
    if (checkleap(year) == 1) {
      if (day == 29) {
        ch = 1;
        day = 1;
        month += 1;
      }
    } else {
      if (day == 28) {
        ch = 1;
        day = 1;
        month += 1;
      }
    }
  }
  if (ch == 0)
    day++;
  getmonth(month);
  getdate(day);
  gethours(hour);
  write(1, ":", 1);
  getminute(minute);
}
```