user: 请从给定的汇编指令推导出C源代码:

```asm
<_DtHelpCeAddCharToBuf>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  mov    %rdx,-0x28(%rbp)
  mov    %rcx,-0x30(%rbp)
  mov    %r8d,-0x34(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  je     L98
  mov    -0x18(%rbp),%rax
  mov    (%rax),%rax
  test   %rax,%rax
  je     L98
  cmpq   $0x0,-0x20(%rbp)
  je     L98
  cmpq   $0x0,-0x28(%rbp)
  je     L98
  cmpq   $0x0,-0x30(%rbp)
  je     L98
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rax
  test   %rax,%rax
  jne    L78
  mov    -0x28(%rbp),%rax
  mov    (%rax),%eax
  test   %eax,%eax
  jne    L98
  mov    -0x30(%rbp),%rax
  mov    (%rax),%eax
  test   %eax,%eax
  je     L78
L98:
  mov    D12(%rip),%rax
  mov    (%rax),%edx
  mov    D27(%rip),%rax
  mov    %edx,(%rax)
  mov    $0xffffffff,%eax
  jmp    L157
L78:
  mov    -0x18(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x28(%rbp),%rax
  mov    (%rax),%eax
  lea    0x2(%rax),%edx
  mov    -0x30(%rbp),%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  jl     L109
  mov    -0x28(%rbp),%rax
  mov    (%rax),%eax
  lea    0x3(%rax),%edx
  mov    -0x30(%rbp),%rax
  mov    (%rax),%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  cmp    %eax,-0x34(%rbp)
  jle    L19
  mov    -0x30(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x34(%rbp),%eax
  add    %eax,%edx
  mov    -0x30(%rbp),%rax
  mov    %edx,(%rax)
  jmp    L104
L19:
  mov    -0x28(%rbp),%rax
  mov    (%rax),%eax
  lea    0x3(%rax),%edx
  mov    -0x30(%rbp),%rax
  mov    %edx,(%rax)
L104:
  cmpq   $0x0,-0x10(%rbp)
  je     L121
  mov    -0x30(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x10(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <realloc@plt>
  mov    %rax,-0x10(%rbp)
  jmp    L69
L121:
  mov    -0x30(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x28(%rbp),%rax
  movl   $0x0,(%rax)
L69:
  mov    -0x20(%rbp),%rax
  mov    -0x10(%rbp),%rdx
  mov    %rdx,(%rax)
L109:
  cmpq   $0x0,-0x10(%rbp)
  jne    L148
  mov    D27(%rip),%rax
  movl   $0xfffffff9,(%rax)
  mov    $0xffffffff,%eax
  jmp    L157
L148:
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x28(%rbp),%rdx
  mov    (%rdx),%edx
  movslq %edx,%rcx
  mov    -0x10(%rbp),%rdx
  add    %rcx,%rdx
  movzbl (%rax),%eax
  mov    %al,(%rdx)
  mov    -0x18(%rbp),%rax
  mov    -0x8(%rbp),%rdx
  mov    %rdx,(%rax)
  mov    -0x28(%rbp),%rax
  mov    (%rax),%eax
  lea    0x1(%rax),%edx
  mov    -0x28(%rbp),%rax
  mov    %edx,(%rax)
  mov    -0x28(%rbp),%rax
  mov    (%rax),%eax
  movslq %eax,%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
  mov    $0x0,%eax
L157:
  leave
  ret
```

assistant: ```c
int _DtHelpCeAddCharToBuf(char **src, char **dst, int *dst_size, int *dst_max, int grow_size) {
  char *srcPtr;
  char *dstPtr;
  if (src == 0 || *src == 0 || dst == 0 || dst_size == 0 || dst_max == 0 || (*dst == 0 && (*dst_size || *dst_max))) {
    errno = EINVAL;
    return -1;
  }
  srcPtr = *src;
  dstPtr = *dst;
  if ((*dst_size + 2) >= *dst_max) {
    if (grow_size > *dst_size + 3 - *dst_max)
      *dst_max = *dst_max + grow_size;
    else
      *dst_max = *dst_size + 3;
    if (dstPtr)
      dstPtr = (char *)realloc((void *)dstPtr, *dst_max);
    else {
      dstPtr = (char *)malloc(*dst_max);
      *dst_size = 0;
    }
    *dst = dstPtr;
  }
  if (!dstPtr) {
    errno = -7;
    return -1;
  }
  dstPtr[*dst_size] = *srcPtr++;
  *src = srcPtr;
  *dst_size = *dst_size + 1;
  dstPtr[*dst_size] = '\0';
  return 0;
}
```