user: Please show me the C implementation that matches the assembly code listed below:

```asm
<myAtoi>:
  endbr64
  mov    %rdi,%rcx
  test   %rdi,%rdi
  je     L13
  movzbl (%rdi),%edx
  test   %dl,%dl
  je     L13
  mov    D18(%rip),%rax
  xor    %r11d,%r11d
  movslq (%rax),%rdi
  mov    %rdi,%r10
  imul   $0x66666667,%rdi,%rdi
  mov    %r10d,%eax
  sar    $0x1f,%eax
  sar    $0x22,%rdi
  sub    %eax,%edi
  mov    D10(%rip),%rax
  movslq (%rax),%r8
  mov    %r8,%r9
  imul   $0x66666667,%r8,%r8
  mov    %r9d,%eax
  sar    $0x1f,%eax
  sar    $0x22,%r8
  sub    %eax,%r8d
  xor    %eax,%eax
L20:
  mov    %edx,%esi
  and    $0xffffffef,%esi
  cmp    $0x20,%sil
  je     L137
  cmp    $0x2d,%dl
  je     L86
  cmp    $0x2b,%dl
  je     L148
  movzbl (%rcx),%edx
  jmp    L151
  nopw   0x0(%rax,%rax,1)
L185:
  cmp    %eax,%edi
  jl     L104
  lea    (%rax,%rax,4),%eax
  movsbl %sil,%esi
  mov    %r10d,%edx
  add    %eax,%eax
  sub    %esi,%edx
  cmp    %eax,%edx
  jl     L104
  movzbl 0x1(%rcx),%edx
  add    $0x1,%rcx
  add    %esi,%eax
  test   %dl,%dl
  je     L10
L151:
  lea    -0x30(%rdx),%esi
  cmp    $0x9,%sil
  ja     L10
  test   %r11d,%r11d
  je     L185
L58:
  cmp    %eax,%r8d
  jg     L60
  sub    $0x30,%edx
  lea    (%rax,%rax,4),%eax
  movsbl %dl,%edx
  add    %eax,%eax
  lea    (%r9,%rdx,1),%esi
  cmp    %eax,%esi
  jg     L60
  add    $0x1,%rcx
  sub    %edx,%eax
  mov    $0x1,%r11d
  movzbl (%rcx),%edx
  test   %dl,%dl
  jne    L151
L10:
  ret
  nopw   0x0(%rax,%rax,1)
L137:
  movzbl 0x1(%rcx),%edx
  add    $0x1,%rcx
  test   %dl,%dl
  jne    L20
  ret
  nopl   0x0(%rax)
L86:
  movzbl 0x1(%rcx),%edx
  lea    0x1(%rcx),%rsi
  test   %dl,%dl
  je     L13
  lea    -0x30(%rdx),%ecx
  cmp    $0x9,%cl
  ja     L198
  mov    %rsi,%rcx
  jmp    L58
  nopl   0x0(%rax)
L148:
  movzbl 0x1(%rcx),%edx
  lea    0x1(%rcx),%rsi
  test   %dl,%dl
  je     L13
  mov    %rsi,%rcx
  jmp    L151
  nopl   0x0(%rax)
L13:
  xor    %eax,%eax
  ret
  nopl   0x0(%rax,%rax,1)
L104:
  mov    %r10d,%eax
  ret
  nopl   0x0(%rax)
L60:
  mov    %r9d,%eax
  ret
L198:
  ret
```

assistant: ```c
int myAtoi(char *str) {
  if (str == NULL)
    return 0;
  int negtive = 0;
  int result = 0;
  int tmp = 0;
  int start = 0;
  char *p = str;
  while (*p) {
    if (start == 0) {
      if (*p == ' ' || *p == '0') {
        p++;
        continue;
      } else {
        start = 1;
        if (*p == '-') {
          negtive = 1;
          p++;
          if (*p == '\0') {
            return 0;
          }
        } else if (*p == '+') {
          p++;
          if (*p == '\0') {
            return 0;
          }
        }
      }
    }
    if (*p >= '0' && *p <= '9') {
      if (!negtive) {
        if (INT_MAX / 10 >= result) {
          result *= 10;
          tmp = *p - '0';
          if (INT_MAX - tmp >= result) {
            result += tmp;
            p++;
          } else {
            return INT_MAX;
          }
        } else {
          return INT_MAX;
        }
      } else {
        if (INT_MIN / 10 <= result) {
          result *= 10;
          tmp = *p - '0';
          if (INT_MIN + tmp <= result) {
            result -= tmp;
            p++;
          } else {
            return INT_MIN;
          }
        } else {
          return INT_MIN;
        }
      }
    } else {
      break;
    }
  }
  return result;
}
```