user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<_sconfig_parse_line>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  mov    %rdi,0x8(%rsp)
  mov    %esi,%ebp
  mov    %rdx,%r15
  mov    %rcx,%r13
  test   %esi,%esi
  jle    L12
  mov    %rdi,%r12
  mov    $0x0,%ebx
L254:
  movzbl (%r12),%edi
  cmp    $0x3d,%dil
  je     L173
  cmp    $0x5f,%dil
  je     L173
  movsbl %dil,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L124
  movsbl (%r12),%edi
  call   <isspace@plt>
  test   %rax,%rax
  je     L86
  add    $0x1,%ebx
  add    $0x1,%r12
  cmp    %ebx,%ebp
  jne    L254
  mov    $0x0,%eax
  jmp    L129
L12:
  mov    $0x0,%ebx
L86:
  cmp    %ebx,%ebp
  je     L53
  movslq %ebx,%r12
  add    0x8(%rsp),%r12
  mov    $0x0,%eax
  cmpb   $0x23,(%r12)
  je     L129
  mov    %r12,(%r15)
  cmp    %ebx,%ebp
  jle    L264
  movl   $0x0,0x4(%rsp)
  mov    $0x1,%r15d
  jmp    L356
L232:
  mov    %r15d,0x4(%rsp)
L314:
  add    $0x1,%ebx
  add    $0x1,%r12
  cmp    %ebx,%ebp
  je     L90
L356:
  movzbl (%r12),%edi
  cmp    $0x3d,%dil
  je     L366
  movsbl %dil,%edi
  call   <isupper@plt>
  test   %rax,%rax
  jne    L232
  movsbl (%r12),%edi
  call   <islower@plt>
  test   %rax,%rax
  jne    L70
  movsbl (%r12),%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L314
  cmpb   $0x5f,(%r12)
  je     L314
  mov    $0xffffffff,%eax
  jmp    L129
L70:
  mov    %r15d,0x4(%rsp)
  jmp    L314
L90:
  mov    $0xffffffff,%eax
  jmp    L129
L366:
  cmp    %ebx,%ebp
  je     L132
  cmpl   $0x0,0x4(%rsp)
  je     L132
  lea    0x1(%rbx),%r12d
  movslq %ebx,%rbx
  mov    0x8(%rsp),%rax
  movb   $0x0,(%rax,%rbx,1)
  cmp    %r12d,%ebp
  je     L386
  movslq %r12d,%rbx
  add    0x8(%rsp),%rbx
  mov    %rbx,0x0(%r13)
  cmp    %r12d,%ebp
  jle    L187
  mov    $0xffffffff,%r15d
  jmp    L179
L386:
  movslq %r12d,%rax
  add    0x8(%rsp),%rax
  mov    %rax,0x0(%r13)
  mov    $0x1,%eax
  jmp    L129
L133:
  movsbl (%r14),%edi
  call   <isspace@plt>
  test   %rax,%rax
  cmove  %r12d,%r15d
  add    $0x1,%r12d
  add    $0x1,%rbx
  cmp    %r12d,%ebp
  je     L115
L179:
  mov    %rbx,%r14
  cmpb   $0x23,(%rbx)
  jne    L133
  cmp    %rbx,0x0(%r13)
  je     L133
  movsbl -0x1(%rbx),%edi
  call   <isspace@plt>
  test   %rax,%rax
  je     L133
L115:
  cmp    $0xffffffff,%r15d
  je     L187
  mov    0x0(%r13),%rax
  movsbl (%rax),%edi
  call   <isspace@plt>
  test   %rax,%rax
  jne    L122
  movslq %r15d,%r15
  mov    0x8(%rsp),%rax
  movb   $0x0,0x1(%rax,%r15,1)
  mov    $0x2,%eax
  jmp    L129
L187:
  mov    0x0(%r13),%rax
  movb   $0x0,(%rax)
  mov    $0x1,%eax
  jmp    L129
L173:
  mov    $0xffffffff,%eax
L129:
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L124:
  mov    $0xffffffff,%eax
  jmp    L129
L53:
  mov    $0x0,%eax
  jmp    L129
L264:
  mov    $0xffffffff,%eax
  jmp    L129
L132:
  mov    $0xffffffff,%eax
  jmp    L129
L122:
  mov    $0xffffffff,%eax
  jmp    L129
```

assistant: ```c
int _sconfig_parse_line(char *buffer, int len, char **name, char **value) {
  int i;
  for (i = 0; i < len; ++i) {
    if (buffer[i] == '=' || buffer[i] == '_' || isdigit(buffer[i]))
      return -1;
    if (!isspace(buffer[i]))
      break;
  }
  if (i == len || buffer[i] == '#')
    return 0;
  *name = buffer + i;
  int has_alpha = 0;
  for (; i < len; ++i) {
    if (buffer[i] == '=')
      break;
    else if (isupper(buffer[i]) || islower(buffer[i])) {
      has_alpha = 1;
      continue;
    } else if (isdigit(buffer[i]) || buffer[i] == '_')
      continue;
    else
      return -1;
  }
  if (i == len || !has_alpha)
    return -1;
  buffer[i++] = '\0';
  if (i == len) {
    *value = buffer + i;
    return 1;
  }
  *value = buffer + i;
  int last_char = -1;
  for (; i < len; ++i) {
    if (buffer[i] == '#' && buffer + i != *value && isspace(buffer[i - 1]))
      break;
    else if (!isspace(buffer[i]))
      last_char = i;
  }
  if (last_char == -1) {
    **value = '\0';
    return 1;
  }
  if (isspace(**value))
    return -1;
  buffer[last_char + 1] = '\0';
  return 2;
}
```