user: Translate the below assembly code into C programming language:

```asm
<dt_parse_iso_zone_lenient>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  mov    %rsi,%r12
  test   %rsi,%rsi
  je     L56
  mov    %rdi,%rbp
  mov    %rsi,%rbx
  mov    %rdx,%r13
  movzbl (%rdi),%eax
  cmp    $0x47,%al
  je     L287
  jbe    L220
  mov    %eax,%edx
  and    $0xffffffdf,%edx
  cmp    $0x5a,%dl
  je     L155
  mov    $0x0,%r12d
  cmp    $0x55,%al
  jne    L56
  mov    $0x0,%r12d
  cmp    $0x2,%rsi
  jbe    L56
  cmpb   $0x54,0x1(%rdi)
  jne    L56
  cmpb   $0x43,0x2(%rdi)
  jne    L56
  cmp    $0x3,%rsi
  jbe    L224
  movzbl 0x3(%rdi),%eax
  sub    $0x2b,%eax
  test   $0xfd,%al
  je     L369
  mov    $0x3,%r12d
  mov    $0x0,%r14d
  jmp    L262
L220:
  cmp    $0x2b,%al
  je     L64
  cmp    $0x2d,%al
  jne    L25
  mov    $0xffffffff,%r15d
L134:
  mov    $0x0,%r12d
  cmp    $0x1,%rbx
  jbe    L56
  mov    %rbx,%rdx
  mov    $0x1,%esi
  mov    %rbp,%rdi
  call   <count_digits@plt>
  cmp    $0x2,%eax
  je     L150
  cmp    $0x4,%eax
  je     L18
  cmp    $0x1,%eax
  jne    L56
  mov    $0x1,%edx
  mov    $0x1,%esi
  mov    %rbp,%rdi
  call   <parse_number@plt>
  mov    %eax,%r14d
  mov    $0x2,%r12d
L373:
  lea    0x1(%r12),%rax
  mov    %rax,0x8(%rsp)
  cmp    %rbx,%rax
  ja     L315
  mov    $0x0,%eax
  cmpb   $0x3a,0x0(%rbp,%r12,1)
  jne    L269
  mov    %rbx,%rdx
  mov    0x8(%rsp),%rsi
  mov    %rbp,%rdi
  call   <count_digits@plt>
  cmp    $0x2,%eax
  je     L260
  mov    $0x0,%r12d
  jmp    L56
L25:
  mov    $0x0,%r12d
  jmp    L56
L287:
  mov    $0x0,%r12d
  cmp    $0x2,%rsi
  jbe    L56
  cmpb   $0x4d,0x1(%rdi)
  jne    L56
  cmpb   $0x54,0x2(%rdi)
  jne    L56
  cmp    $0x3,%rsi
  jbe    L374
  movzbl 0x3(%rdi),%eax
  sub    $0x2b,%eax
  test   $0xfd,%al
  je     L26
  mov    $0x3,%r12d
  mov    $0x0,%r14d
  jmp    L262
L26:
  lea    -0x3(%rsi),%rsi
  lea    0x3(%rdi),%rdi
  call   <dt_parse_iso_zone_lenient>
  mov    %rax,%r12
  lea    0x3(%rax),%rax
  test   %r12,%r12
  cmovne %rax,%r12
  jmp    L56
L369:
  lea    -0x3(%rsi),%rsi
  lea    0x3(%rdi),%rdi
  mov    %r13,%rdx
  call   <dt_parse_iso_zone_lenient>
  mov    %rax,%r12
  lea    0x3(%rax),%rax
  test   %r12,%r12
  cmovne %rax,%r12
  jmp    L56
L64:
  mov    $0x1,%r15d
  jmp    L134
L150:
  mov    $0x2,%edx
  mov    $0x1,%esi
  mov    %rbp,%rdi
  call   <parse_number@plt>
  mov    %eax,%r14d
  mov    $0x3,%r12d
  jmp    L373
L18:
  mov    $0x2,%edx
  mov    $0x1,%esi
  mov    %rbp,%rdi
  call   <parse_number@plt>
  mov    %eax,%r14d
  mov    $0x2,%edx
  mov    $0x3,%esi
  mov    %rbp,%rdi
  call   <parse_number@plt>
  mov    $0x5,%r12d
L269:
  cmp    $0x17,%r14d
  jg     L180
  cmp    $0x3b,%eax
  jg     L180
  imul   $0x3c,%r14d,%r14d
  add    %eax,%r14d
  imul   %r15d,%r14d
  jmp    L262
L260:
  mov    $0x2,%edx
  mov    0x8(%rsp),%rsi
  mov    %rbp,%rdi
  call   <parse_number@plt>
  add    $0x3,%r12
  jmp    L269
L315:
  mov    $0x0,%eax
  jmp    L269
L155:
  mov    $0x1,%r12d
  mov    $0x0,%r14d
L262:
  test   %r13,%r13
  je     L56
  mov    %r14d,0x0(%r13)
L56:
  mov    %r12,%rax
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L374:
  mov    $0x3,%r12d
  mov    $0x0,%r14d
  jmp    L262
L224:
  mov    $0x3,%r12d
  mov    $0x0,%r14d
  jmp    L262
L180:
  mov    $0x0,%r12d
  jmp    L56
```

assistant: ```c
size_t dt_parse_iso_zone_lenient(const char *str, size_t len, int *op) {
  const unsigned char *p;
  int o, h, m, sign;
  size_t n;
  if (len < 1)
    return 0;
  p = (const unsigned char *)str;
  switch (*p) {
  case 'z':
  case 'Z':
    o = 0;
    n = 1;
    goto zulu;
  case 'G':
    if (len < 3 || p[1] != 'M' || p[2] != 'T')
      return 0;
    if (len > 3 && (p[3] == '+' || p[3] == '-')) {
      if (!(n = dt_parse_iso_zone_lenient(str + 3, len - 3, op)))
        return 0;
      return n + 3;
    }
    o = 0;
    n = 3;
    goto zulu;
  case 'U':
    if (len < 3 || p[1] != 'T' || p[2] != 'C')
      return 0;
    if (len > 3 && (p[3] == '+' || p[3] == '-')) {
      if (!(n = dt_parse_iso_zone_lenient(str + 3, len - 3, op)))
        return 0;
      return n + 3;
    }
    o = 0;
    n = 3;
    goto zulu;
  case '+':
    sign = 1;
    break;
  case '-':
    sign = -1;
    break;
  default:
    return 0;
  }
  if (len < 2)
    return 0;
  n = count_digits(p, 1, len);
  m = 0;
  switch (n) {
  case 1:
    h = parse_number(p, 1, 1);
    n = 2;
    break;
  case 2:
    h = parse_number(p, 1, 2);
    n = 3;
    break;
  case 4:
    h = parse_number(p, 1, 2);
    m = parse_number(p, 3, 2);
    n = 5;
    goto hm;
  default:
    return 0;
  }
  if (len < n + 1 || p[n] != ':')
    goto hm;
  if (count_digits(p, ++n, len) != 2)
    return 0;
  m = parse_number(p, n, 2);
  n += 2;
hm:
  if (h > 23 || m > 59)
    return 0;
  o = sign * (h * 60 + m);
zulu:
  if (op)
    *op = o;
  return n;
}
```