user: 请从给定的汇编指令推导出C源代码:

```asm
<string_xmlfixup>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  sub    $0x8,%rsp
  movzbl (%rdi),%eax
  test   %al,%al
  je     L17
  mov    $0x1,%edx
  xor    %edi,%edi
  lea    D39(%rip),%rcx
  xchg   %ax,%ax
L122:
  sub    $0x22,%eax
  cmp    $0x1c,%al
  ja     L36
  movzbl %al,%eax
  movslq (%rcx,%rax,4),%rax
  add    %rcx,%rax
  notrack jmp *%rax
  nopl   0x0(%rax)
L36:
  add    $0x1,%edi
  nopl   0x0(%rax,%rax,1)
L27:
  mov    %edx,%esi
  add    $0x1,%rdx
  movzbl -0x1(%rbp,%rdx,1),%eax
  test   %al,%al
  jne    L122
  cmp    %esi,%edi
  je     L17
  add    $0x1,%edi
  call   <smalloc@plt>
  movzbl 0x0(%rbp),%edx
  mov    %rax,%r12
  test   %dl,%dl
  je     L124
  lea    0x1(%rbp),%rbx
  xor    %r13d,%r13d
  lea    D68(%rip),%rbp
  lea    D59(%rip),%r15
  lea    D63(%rip),%r14
  nopw   0x0(%rax,%rax,1)
L110:
  movslq %r13d,%rax
  lea    (%r12,%rax,1),%rdi
  lea    -0x22(%rdx),%eax
  cmp    $0x1c,%al
  ja     L84
  movzbl %al,%eax
  movslq 0x0(%rbp,%rax,4),%rax
  add    %rbp,%rax
  notrack jmp *%rax
  nopl   0x0(%rax)
L84:
  mov    %dl,(%rdi)
  add    $0x1,%r13d
  cs nopw 0x0(%rax,%rax,1)
L77:
  movzbl (%rbx),%edx
  add    $0x1,%rbx
  test   %dl,%dl
  jne    L110
  movslq %r13d,%rcx
  add    %r12,%rcx
L144:
  movb   $0x0,(%rcx)
  add    $0x8,%rsp
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  cs nopw 0x0(%rax,%rax,1)
  add    $0x4,%edi
  jmp    L27
  nopl   0x0(%rax,%rax,1)
  add    $0x6,%edi
  jmp    L27
  nopl   0x0(%rax,%rax,1)
  add    $0x5,%edi
  jmp    L27
  nopl   0x0(%rax,%rax,1)
  add    $0x8,%edi
  jmp    L27
  nopl   0x0(%rax,%rax,1)
  mov    $0x4,%edx
  mov    %r15,%rsi
  add    $0x4,%r13d
  call   <strncpy@plt>
  jmp    L77
  cs nopw 0x0(%rax,%rax,1)
  mov    $0x4,%edx
  mov    %r14,%rsi
  add    $0x4,%r13d
  call   <strncpy@plt>
  jmp    L77
  cs nopw 0x0(%rax,%rax,1)
  mov    $0x6,%edx
  lea    D23(%rip),%rsi
  add    $0x6,%r13d
  call   <strncpy@plt>
  jmp    L77
  nopw   0x0(%rax,%rax,1)
  mov    $0x5,%edx
  lea    D5(%rip),%rsi
  add    $0x5,%r13d
  call   <strncpy@plt>
  jmp    L77
  nopw   0x0(%rax,%rax,1)
  mov    $0x8,%edx
  lea    D40(%rip),%rsi
  add    $0x8,%r13d
  call   <strncpy@plt>
  jmp    L77
  nopw   0x0(%rax,%rax,1)
L17:
  add    $0x8,%rsp
  mov    %rbp,%rdi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1080 <string_dup@plt>
L124:
  mov    %rax,%rcx
  jmp    L144
```

tool_calls: name: retrieve_data
arguments: label: D59
type_infered: string
name: retrieve_data
arguments: label: D63
type_infered: string
name: retrieve_data
arguments: label: D23
type_infered: string
name: retrieve_data
arguments: label: D5
type_infered: string
name: retrieve_data
arguments: label: D40
type_infered: string

tool: D59: &gt;

tool: D63: &lt;

tool: D23: &apos;

tool: D5: &amp;

tool: D40: &dquote;

assistant: ```c
char *string_xmlfixup(const char *str, int cdata) {
  int ich, i;
  char *nstr;
  for (i = 0, ich = 0; str[i]; i++) {
    switch (str[i]) {
    case '&':
      ich += 5;
      break;
    case '\"':
      ich += 8;
      break;
    case '\'':
      ich += 6;
      break;
    case '<':
      ich += 4;
      break;
    case '>':
      ich += 4;
      break;
    default:
      ich++;
      break;
    }
  }
  if (ich == i) {
    return string_dup(str);
  }
  nstr = (char *)smalloc(ich + 1);
  for (i = 0, ich = 0; str[i]; i++) {
    switch (str[i]) {
    case '&':
      strncpy(nstr + ich, "&amp;", 5);
      ich += 5;
      break;
    case '\"':
      strncpy(nstr + ich, "&dquote;", 8);
      ich += 8;
      break;
    case '\'':
      strncpy(nstr + ich, "&apos;", 6);
      ich += 6;
      break;
    case '<':
      strncpy(nstr + ich, "&lt;", 4);
      ich += 4;
      break;
    case '>':
      strncpy(nstr + ich, "&gt;", 4);
      ich += 4;
      break;
    default:
      nstr[ich] = str[i];
      ich++;
      break;
    }
  }
  nstr[ich] = '\0';
  return nstr;
}
```