user: 这段汇编代码用C语言表示是什么样的：

```asm
<SubVar>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    %rsi,0x8(%rsp)
  mov    %rdx,%r15
  mov    %rdx,0x18(%rsp)
  mov    %rcx,0x10(%rsp)
  mov    %r8,%rbx
  mov    %edi,%r13d
  mov    %rcx,%rdi
  call   <strlen@plt>
  mov    %rax,%r14
  mov    %r15,%rdi
  call   <strlen@plt>
  mov    %rax,%rbp
  mov    (%rbx),%r12d
  mov    0x8(%rsp),%rdi
  call   <strlen@plt>
  sub    %eax,%r14d
  lea    -0x1(%r14,%rbp,1),%eax
  cmp    %eax,%r12d
  jle    L26
L22:
  movslq (%rbx),%rdi
  call   <malloc@plt>
  mov    %rax,%r12
  mov    0x10(%rsp),%rsi
  mov    %rax,%rdi
  call   <strcpy@plt>
  movzbl (%r12),%eax
  test   %al,%al
  je     L98
  mov    %r12,%rbx
  jmp    L7
L26:
  mov    $0x200,%eax
  cmp    %eax,%ebp
  cmovl  %eax,%ebp
  lea    (%r12,%rbp,1),%esi
  movslq %esi,%rsi
  mov    0x10(%rsp),%rdi
  call   <realloc@plt>
  mov    %rax,0x10(%rsp)
  add    %ebp,(%rbx)
  jmp    L22
L61:
  cmp    %rbx,%r12
  jae    L37
  cmpb   $0x5c,-0x1(%rbx)
  je     L113
L37:
  lea    0x1(%rbx),%r14
  lea    D19(%rip),%rsi
  mov    %r14,%rdi
  call   <strcspn@plt>
  cltq
  lea    0x1(%rbx,%rax,1),%rbp
  movzbl 0x0(%rbp),%r15d
  movb   $0x0,0x0(%rbp)
  mov    %r14,%rsi
  mov    0x8(%rsp),%rdi
  call   <strcasecmp@plt>
  test   %eax,%eax
  je     L46
  mov    %r15b,0x0(%rbp)
L34:
  lea    0x1(%rbp),%rbx
L56:
  movzbl (%rbx),%eax
  test   %al,%al
  je     L98
L7:
  cmp    %al,%r13b
  je     L61
  add    $0x1,%rbx
  jmp    L56
L113:
  add    $0x1,%rbx
  jmp    L56
L46:
  movb   $0x0,(%rbx)
  lea    0x1(%rbp),%r9
  movsbl %r15b,%r8d
  mov    0x18(%rsp),%rcx
  mov    %r12,%rdx
  lea    D8(%rip),%rsi
  mov    0x10(%rsp),%rbx
  mov    %rbx,%rdi
  call   <sprintf@plt>
  mov    %rbx,%rsi
  mov    %r12,%rdi
  call   <strcpy@plt>
  jmp    L34
L98:
  mov    %r12,%rdi
  call   <free@plt>
  mov    0x10(%rsp),%rax
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

tool_calls: name: unpack_data
arguments: data_tag: D19
datatype: string
name: unpack_data
arguments: data_tag: D8
datatype: string

tool: D19:  ,()'
:;.{}[]-+=~!@#$%^*<>"

tool: D8: %s%s%c%s

assistant: ```c
char *SubVar(char sep, char *var_name, char *var_value, char *oldbuf, int *bufsize) {
  char *buf, *s, *t;
  int l, n;
  char o;
  char *local_buf;
  l = strlen(oldbuf);
  n = strlen(var_value);
  if (l - (int)strlen(var_name) - 1 + (int)strlen(var_value) > (int)(*bufsize - 1)) {
    buf = realloc(oldbuf, *bufsize + ((n > 512) ? n : 512));
    *bufsize += ((n > 512) ? n : 512);
  } else
    buf = oldbuf;
  local_buf = malloc(*bufsize * sizeof(char));
  strcpy(local_buf, buf);
  if (!local_buf) {
    html_error("FI Error", "Unable to allocate memory");
    exit(-1);
  }
  s = local_buf;
  while (*s != '\0') {
    if (*s == sep) {
      if (s > local_buf && *(s - 1) == '\\') {
        s++;
        continue;
      }
      n = strcspn(s + 1, " ,()'\n:;.{}[]-+=~!@#$%^*<>\"");
      t = s + n + 1;
      o = *t;
      *t = '\0';
      if (!strcasecmp(var_name, s + 1)) {
        *s = '\0';
        sprintf(buf, "%s%s%c%s", local_buf, var_value, o, t + 1);
        strcpy(local_buf, buf);
      } else {
        *t = o;
      }
      s = t + 1;
    } else
      s++;
  }
  free(local_buf);
  return (buf);
}
```