user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<i_Xs_conv>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  mov    %rdi,%r12
  mov    %rdx,%rdi
  push   %rbp
  mov    %rdx,%rbp
  push   %rbx
  xor    %ebx,%ebx
  sub    $0x18,%rsp
  mov    %esi,0xc(%rsp)
  call   <jelio_buffer_peekc@plt>
  mov    %eax,%edi
  jmp    L48
  nopw   0x0(%rax,%rax,1)
L182:
  mov    %rbp,%rdi
  add    $0x1,%ebx
  call   <jelio_buffer_getc@plt>
  mov    %rbp,%rdi
  call   <jelio_buffer_peekc@plt>
  mov    %eax,%edi
L48:
  call   <char_isspace@plt>
  test   %rax,%rax
  jne    L182
  mov    0xc(%rsp),%eax
  xor    %r13d,%r13d
  test   %eax,%eax
  jle    L68
  movl   $0x0,0x8(%rsp)
  add    $0x1,%ebx
  xor    %r15d,%r15d
  jmp    L94
  xchg   %ax,%ax
L51:
  lea    -0x41(%r14),%eax
  cmp    $0x5,%eax
  ja     L68
  mov    %ebx,%r13d
  test   %r15d,%r15d
  jne    L67
L73:
  lea    -0x37(%r14),%edx
  mov    $0x1,%r15d
  shl    $0x4,%edx
  mov    %dl,(%r12)
  nopw   0x0(%rax,%rax,1)
L122:
  mov    %rbp,%rdi
  add    $0x1,%ebx
  call   <jelio_buffer_getc@plt>
  mov    0xc(%rsp),%esi
  cmp    %esi,0x8(%rsp)
  jge    L68
L94:
  mov    %rbp,%rdi
  lea    -0x1(%rbx),%r13d
  call   <jelio_buffer_peekc@plt>
  mov    %eax,%r14d
  cmp    $0xffffffff,%eax
  je     L68
  mov    %eax,%edi
  call   <char_isspace@plt>
  test   %rax,%rax
  jne    L68
  lea    -0x30(%r14),%eax
  lea    -0x61(%r14),%ecx
  cmp    $0x9,%eax
  jbe    L5
  cmp    $0x5,%ecx
  ja     L51
L5:
  mov    %ebx,%r13d
  test   %r15d,%r15d
  je     L44
  movzbl (%r12),%r8d
  lea    0x1(%r12),%rdi
  lea    (%r8,%r14,1),%esi
  cmp    $0x9,%eax
  ja     L204
  lea    -0x30(%rsi),%eax
L69:
  mov    %al,(%r12)
  xor    %r15d,%r15d
  mov    %rdi,%r12
  addl   $0x1,0x8(%rsp)
  jmp    L122
  xchg   %ax,%ax
L44:
  cmp    $0x9,%eax
  ja     L132
  mov    %r14d,%edx
  mov    $0x1,%r15d
  shl    $0x4,%edx
  mov    %dl,(%r12)
  jmp    L122
  nopw   0x0(%rax,%rax,1)
L67:
  movzbl (%r12),%r8d
  lea    0x1(%r12),%rdi
L152:
  lea    -0x37(%r8,%r14,1),%eax
  jmp    L69
  nopl   0x0(%rax)
L68:
  add    $0x18,%rsp
  mov    %r13d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L204:
  cmp    $0x5,%ecx
  ja     L152
  lea    -0x57(%rsi),%eax
  jmp    L69
  nopl   0x0(%rax)
L132:
  cmp    $0x5,%ecx
  ja     L73
  lea    -0x57(%r14),%edx
  mov    $0x1,%r15d
  shl    $0x4,%edx
  mov    %dl,(%r12)
  jmp    L122
```

assistant: ```c
int i_Xs_conv(void *value, int n, void *inbuf) {
  struct jelio_buf *jb = inbuf;
  unsigned char *sval = value;
  unsigned int c;
  int count = 0;
  int scount = 0;
  int flag = 0;
  for (c = jelio_buffer_peekc(jb); char_isspace(c); c = jelio_buffer_peekc(jb)) {
    jelio_buffer_getc(jb);
    count++;
  }
  if (n < 1)
    return 0;
  while (1) {
    if (scount >= n)
      break;
    c = jelio_buffer_peekc(jb);
    if (c == -1 || char_isspace(c))
      break;
    if ((c < '0' || c > '9') && (c < 'a' || c > 'f') && (c < 'A' || c > 'F'))
      break;
    count++;
    if (flag) {
      if (c >= '0' && c <= '9')
        *sval++ += (c - '0');
      else {
        if (c >= 'a' && c <= 'f')
          *sval++ += (c - 'a' + 10);
        else
          *sval++ += (c - 'A' + 10);
      }
      scount++;
      flag = 0;
    } else {
      if (c >= '0' && c <= '9')
        *sval = (c - '0') << 4;
      else {
        if (c >= 'a' && c <= 'f')
          *sval = (c - 'a' + 10) << 4;
        else
          *sval = (c - 'A' + 10) << 4;
      }
      flag = 1;
    }
    jelio_buffer_getc(jb);
  }
  return count;
}
```