user: 下面的汇编指令对应的C源代码是什么:

```asm
<url_encode>:
  endbr64
  push   %r15
  mov    $0xfe,%ecx
  pxor   %xmm0,%xmm0
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  mov    %esi,%ebx
  mov    %rbp,%rsi
  sub    $0x818,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x808(%rsp)
  xor    %eax,%eax
  lea    0x10(%rsp),%rdi
  movaps %xmm0,(%rsp)
  rep stos %rax,%es:(%rdi)
  lea    D7(%rip),%rdi
  call   <printf@plt>
  movzbl 0x0(%rbp),%edi
  test   %dil,%dil
  je     L47
  mov    %rsp,%r12
  mov    %rbp,%r15
  lea    D44(%rip),%r13
  mov    %r12,%r14
  jmp    L11
L100:
  movzbl (%r15),%eax
  add    $0x1,%r14
  mov    %al,-0x1(%r14)
L135:
  movzbl 0x1(%r15),%edi
  add    $0x1,%r15
  test   %dil,%dil
  je     L74
L50:
  mov    %r14,%rax
  sub    %r12,%rax
  cmp    $0x7fb,%rax
  jg     L74
L11:
  call   <isalnum@plt>
  test   %rax,%rax
  jne    L100
  movzbl (%r15),%esi
  mov    %r13,%rdi
  call   <strchr@plt>
  test   %rax,%rax
  jne    L100
  movzbl (%r15),%edi
  test   %ebx,%ebx
  jne    L25
L97:
  cmp    $0x20,%dil
  jne    L16
  movzbl 0x1(%r15),%edi
  movb   $0x2b,(%r14)
  add    $0x1,%r15
  add    $0x1,%r14
  test   %dil,%dil
  jne    L50
  nopl   0x0(%rax,%rax,1)
L74:
  movb   $0x0,(%r14)
  mov    %r12,%rsi
  lea    D23(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    %r12,%rcx
  mov    $0x800,%esi
  mov    %rbp,%rdi
  lea    D15(%rip),%rdx
  call   <snprintf@plt>
  mov    0x808(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L38
  add    $0x818,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L16:
  movb   $0x25,(%r14)
  shr    $0x4,%dil
  add    $0x3,%r14
  movzbl %dil,%edi
  call   <to_hex@plt>
  movzbl (%r15),%edi
  mov    %al,-0x2(%r14)
  and    $0xf,%edi
  call   <to_hex@plt>
  mov    %al,-0x1(%r14)
  jmp    L135
  cs nopw 0x0(%rax,%rax,1)
L25:
  movzbl %dil,%esi
  lea    D25(%rip),%rdi
  call   <strchr@plt>
  test   %rax,%rax
  jne    L100
  movzbl (%r15),%edi
  jmp    L97
L47:
  mov    %rsp,%r12
  mov    %r12,%r14
  jmp    L74
L38:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: data_tag: D7
type_infered: string
name: read_data
arguments: data_tag: D44
type_infered: string
name: read_data
arguments: data_tag: D23
type_infered: string
name: read_data
arguments: data_tag: D15
type_infered: string
name: read_data
arguments: data_tag: D25
type_infered: string

tool: D7: orignal str:%s


tool: D44: _-.~

tool: D23: encode: %s


tool: D15: %s

tool: D25: %?&=/:

assistant: ```c
int url_encode(char *str, int ext) {
  unsigned char *pstr = (unsigned char *)str;
  unsigned char buf[2048] = {0};
  unsigned char *pbuf = buf;
  printf("orignal str:%s\n", str);
  while (*pstr && (pbuf - buf + 4) < 2048) {
    if (isalnum(*pstr) || NULL != strchr("_-.~", *pstr) || (ext && NULL != strchr("%?&=/:", *pstr))) {
      *pbuf++ = *pstr;
    } else if (*pstr == ' ') {
      *pbuf++ = '+';
    } else {
      *pbuf++ = '%';
      *pbuf++ = to_hex(*pstr >> 4);
      *pbuf++ = to_hex(*pstr & 15);
    }
    pstr++;
  }
  *pbuf = '\0';
  printf("encode: %s\n", buf);
  snprintf(str, 2048, "%s", buf);
  return 0;
}
```