ylfeng/ReF-Decompile-dataset huggingface dataset:
user: 请从给定的汇编指令推导出C源代码:

```asm
<parse_extension>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  cmp    $0xf0,%eax
  je     L84
  cmp    $0xf0,%eax
  jg     L162
  cmp    $0x70,%eax
  je     L138
  cmp    $0x70,%eax
  jg     L162
  cmp    $0x60,%eax
  je     L50
  cmp    $0x60,%eax
  jg     L162
  cmp    $0x50,%eax
  je     L7
  cmp    $0x50,%eax
  jg     L162
  cmp    $0x40,%eax
  je     L142
  cmp    $0x40,%eax
  jg     L162
  cmp    $0x2,%eax
  je     L44
  cmp    $0x10,%eax
  je     L144
  jmp    L162
L44:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <extension_version@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <parse_cta@plt>
  mov    %eax,-0x4(%rbp)
  jmp    L88
L138:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <extension_version@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <parse_displayid@plt>
  jmp    L88
L84:
  nop
  jmp    L88
L162:
  nop
  jmp    L88
L50:
  nop
  jmp    L88
L7:
  nop
  jmp    L88
L142:
  nop
  jmp    L88
L144:
  nop
L88:
  mov    -0x4(%rbp),%eax
  leave
  ret
```

assistant: ```c
int parse_extension(const unsigned char *x) {
  int conformant_extension;
  (void)("\n");
  switch (x[0]) {
  case 0x02:
    (void)("CTA extension block\n");
    extension_version(x);
    conformant_extension = parse_cta(x);
    break;
  case 0x10:
    (void)("VTB extension block\n");
    break;
  case 0x40:
    (void)("DI extension block\n");
    break;
  case 0x50:
    (void)("LS extension block\n");
    break;
  case 0x60:
    (void)("DPVL extension block\n");
    break;
  case 0x70:
    (void)("DisplayID extension block\n");
    extension_version(x);
    parse_displayid(x);
    break;
  case 0xF0:
    (void)("Block map\n");
    break;
  case 0xFF:
    (void)("Manufacturer-specific extension block\n");
  default:
    (void)("Unknown extension block\n");
    break;
  }
  (void)("\n");
  return conformant_extension;
}
```
user: 请从给定的汇编指令推导出C源代码：

```asm
<parse_extension>:
  endbr64
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  mov    %rdi,%rbx
  movzbl (%rdi),%edx
  cmp    $0x2,%dl
  je     L31
  cmp    $0x70,%dl
  je     L20
L38:
  mov    %ebp,%eax
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  ret
L31:
  call   <extension_version@plt>
  mov    %rbx,%rdi
  call   <parse_cta@plt>
  mov    %eax,%ebp
  jmp    L38
L20:
  call   <extension_version@plt>
  mov    %rbx,%rdi
  call   <parse_displayid@plt>
  jmp    L38
```

assistant: ```c
int parse_extension(const unsigned char *x) {
  int conformant_extension;
  (void)("\n");
  switch (x[0]) {
  case 0x02:
    (void)("CTA extension block\n");
    extension_version(x);
    conformant_extension = parse_cta(x);
    break;
  case 0x10:
    (void)("VTB extension block\n");
    break;
  case 0x40:
    (void)("DI extension block\n");
    break;
  case 0x50:
    (void)("LS extension block\n");
    break;
  case 0x60:
    (void)("DPVL extension block\n");
    break;
  case 0x70:
    (void)("DisplayID extension block\n");
    extension_version(x);
    parse_displayid(x);
    break;
  case 0xF0:
    (void)("Block map\n");
    break;
  case 0xFF:
    (void)("Manufacturer-specific extension block\n");
  default:
    (void)("Unknown extension block\n");
    break;
  }
  (void)("\n");
  return conformant_extension;
}
```
user: Translate the below assembly code into C programming language:

```asm
<parse_extension>:
  endbr64
  push   %rbp
  movzbl (%rdi),%eax
  mov    %rdi,%rbp
  cmp    $0x2,%al
  je     L8
  cmp    $0x70,%al
  jne    L0
  call   <extension_version@plt>
  mov    %rbp,%rdi
  call   <parse_displayid@plt>
L0:
  xor    %eax,%eax
  pop    %rbp
  ret
  nopl   0x0(%rax)
L8:
  call   <extension_version@plt>
  mov    %rbp,%rdi
  pop    %rbp
  jmp    1080 <parse_cta@plt>
```

assistant: ```c
int parse_extension(const unsigned char *x) {
  int conformant_extension;
  (void)("\n");
  switch (x[0]) {
  case 0x02:
    (void)("CTA extension block\n");
    extension_version(x);
    conformant_extension = parse_cta(x);
    break;
  case 0x10:
    (void)("VTB extension block\n");
    break;
  case 0x40:
    (void)("DI extension block\n");
    break;
  case 0x50:
    (void)("LS extension block\n");
    break;
  case 0x60:
    (void)("DPVL extension block\n");
    break;
  case 0x70:
    (void)("DisplayID extension block\n");
    extension_version(x);
    parse_displayid(x);
    break;
  case 0xF0:
    (void)("Block map\n");
    break;
  case 0xFF:
    (void)("Manufacturer-specific extension block\n");
  default:
    (void)("Unknown extension block\n");
    break;
  }
  (void)("\n");
  return conformant_extension;
}
```
user: Please show me the C implementation that matches the assembly code listed below:

```asm
<parse_extension>:
  endbr64
  push   %rbp
  movzbl (%rdi),%eax
  mov    %rdi,%rbp
  cmp    $0x2,%al
  je     L13
  cmp    $0x70,%al
  jne    L17
  call   <extension_version@plt>
  mov    %rbp,%rdi
  call   <parse_displayid@plt>
L17:
  xor    %eax,%eax
  pop    %rbp
  ret
  nopl   0x0(%rax)
L13:
  call   <extension_version@plt>
  mov    %rbp,%rdi
  pop    %rbp
  jmp    1080 <parse_cta@plt>
```

assistant: ```c
int parse_extension(const unsigned char *x) {
  int conformant_extension;
  (void)("\n");
  switch (x[0]) {
  case 0x02:
    (void)("CTA extension block\n");
    extension_version(x);
    conformant_extension = parse_cta(x);
    break;
  case 0x10:
    (void)("VTB extension block\n");
    break;
  case 0x40:
    (void)("DI extension block\n");
    break;
  case 0x50:
    (void)("LS extension block\n");
    break;
  case 0x60:
    (void)("DPVL extension block\n");
    break;
  case 0x70:
    (void)("DisplayID extension block\n");
    extension_version(x);
    parse_displayid(x);
    break;
  case 0xF0:
    (void)("Block map\n");
    break;
  case 0xFF:
    (void)("Manufacturer-specific extension block\n");
  default:
    (void)("Unknown extension block\n");
    break;
  }
  (void)("\n");
  return conformant_extension;
}
```
user: 这段汇编代码用C语言表示是什么样的?

```asm
<sscanf>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0xd0,%rsp
  mov    %rdi,-0xc8(%rbp)
  mov    %rsi,-0xd0(%rbp)
  mov    %rdx,-0xa0(%rbp)
  mov    %rcx,-0x98(%rbp)
  mov    %r8,-0x90(%rbp)
  mov    %r9,-0x88(%rbp)
  test   %al,%al
  je     L3
  movaps %xmm0,-0x80(%rbp)
  movaps %xmm1,-0x70(%rbp)
  movaps %xmm2,-0x60(%rbp)
  movaps %xmm3,-0x50(%rbp)
  movaps %xmm4,-0x40(%rbp)
  movaps %xmm5,-0x30(%rbp)
  movaps %xmm6,-0x20(%rbp)
  movaps %xmm7,-0x10(%rbp)
L3:
  mov    -0xd0(%rbp),%rdx
  mov    -0xb8(%rbp),%eax
  mov    %rdx,%rsi
  mov    %eax,%edi
  call   <va_start@plt>
  mov    -0xb8(%rbp),%edx
  mov    -0xd0(%rbp),%rcx
  mov    -0xc8(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <vsscanf@plt>
  mov    %eax,-0xb4(%rbp)
  mov    -0xb8(%rbp),%eax
  mov    %eax,%edi
  call   <va_end@plt>
  mov    -0xb4(%rbp),%eax
  leave
  ret
```

assistant: ```c
int sscanf(const char *restrict input, const char *restrict format, ...) {
  int r;
  va_list args;
  va_start(args, format);
  r = vsscanf(input, format, args);
  va_end(args);
  return r;
}
```
user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<sscanf>:
  endbr64
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%r12
  mov    %rsi,%rbx
  mov    $0x0,%ebp
  mov    %ebp,%edi
  call   <va_start@plt>
  mov    %ebp,%edx
  mov    %rbx,%rsi
  mov    %r12,%rdi
  call   <vsscanf@plt>
  mov    %eax,%ebx
  mov    %ebp,%edi
  call   <va_end@plt>
  mov    %ebx,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
```

assistant: ```c
int sscanf(const char *restrict input, const char *restrict format, ...) {
  int r;
  va_list args;
  va_start(args, format);
  r = vsscanf(input, format, args);
  va_end(args);
  return r;
}
```
user: What would the C source look like for the assembly code provided here:

```asm
<sscanf>:
  endbr64
  push   %r13
  xor    %r13d,%r13d
  push   %r12
  mov    %rdi,%r12
  mov    %r13d,%edi
  push   %rbp
  mov    %rsi,%rbp
  call   <va_start@plt>
  mov    %r13d,%edx
  mov    %rbp,%rsi
  mov    %r12,%rdi
  call   <vsscanf@plt>
  mov    %r13d,%edi
  mov    %eax,%r12d
  call   <va_end@plt>
  mov    %r12d,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
```

assistant: ```c
int sscanf(const char *restrict input, const char *restrict format, ...) {
  int r;
  va_list args;
  va_start(args, format);
  r = vsscanf(input, format, args);
  va_end(args);
  return r;
}
```
user: What is the c source code of the assembly code below?

```asm
<sscanf>:
  endbr64
  push   %r13
  xor    %r13d,%r13d
  push   %r12
  mov    %rdi,%r12
  mov    %r13d,%edi
  push   %rbp
  mov    %rsi,%rbp
  call   <va_start@plt>
  mov    %r13d,%edx
  mov    %rbp,%rsi
  mov    %r12,%rdi
  call   <vsscanf@plt>
  mov    %r13d,%edi
  mov    %eax,%r12d
  call   <va_end@plt>
  mov    %r12d,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
```

assistant: ```c
int sscanf(const char *restrict input, const char *restrict format, ...) {
  int r;
  va_list args;
  va_start(args, format);
  r = vsscanf(input, format, args);
  va_end(args);
  return r;
}
```
user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<gf8mul_00011011>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  pxor   %xmm7,%xmm6
  pxor   %xmm7,%xmm5
  pxor   %xmm7,%xmm4
  pxor   %xmm7,%xmm3
  pxor   %xmm7,%xmm1
  pxor   %xmm7,%xmm0
  pxor   %xmm6,%xmm7
  pxor   %xmm6,%xmm5
  pxor   %xmm6,%xmm4
  pxor   %xmm6,%xmm3
  pxor   %xmm6,%xmm2
  pxor   %xmm5,%xmm7
  pxor   %xmm5,%xmm4
  pxor   %xmm5,%xmm2
  pxor   %xmm5,%xmm1
  pxor   %xmm4,%xmm7
  pxor   %xmm4,%xmm1
  pxor   %xmm4,%xmm0
  pxor   %xmm7,%xmm4
  pxor   %xmm3,%xmm7
  pxor   %xmm3,%xmm6
  pxor   %xmm3,%xmm4
  pxor   %xmm2,%xmm6
  pxor   %xmm2,%xmm5
  pxor   %xmm2,%xmm3
  pxor   %xmm1,%xmm5
  pxor   %xmm1,%xmm4
  pxor   %xmm1,%xmm2
  pxor   %xmm0,%xmm4
  pxor   %xmm0,%xmm3
  pxor   %xmm0,%xmm1
  nop
  pop    %rbp
  ret
```

assistant: ```c
void gf8mul_00011011(void) {
  __asm__ __volatile__("\tpxor    %xmm7, %xmm6\n"
                       "\tpxor    %xmm7, %xmm5\n"
                       "\tpxor    %xmm7, %xmm4\n"
                       "\tpxor    %xmm7, %xmm3\n"
                       "\tpxor    %xmm7, %xmm1\n"
                       "\tpxor    %xmm7, %xmm0\n"
                       "\tpxor    %xmm6, %xmm7\n"
                       "\tpxor    %xmm6, %xmm5\n"
                       "\tpxor    %xmm6, %xmm4\n"
                       "\tpxor    %xmm6, %xmm3\n"
                       "\tpxor    %xmm6, %xmm2\n"
                       "\tpxor    %xmm5, %xmm7\n"
                       "\tpxor    %xmm5, %xmm4\n"
                       "\tpxor    %xmm5, %xmm2\n"
                       "\tpxor    %xmm5, %xmm1\n"
                       "\tpxor    %xmm4, %xmm7\n"
                       "\tpxor    %xmm4, %xmm1\n"
                       "\tpxor    %xmm4, %xmm0\n"
                       "\tpxor    %xmm7, %xmm4\n"
                       "\tpxor    %xmm3, %xmm7\n"
                       "\tpxor    %xmm3, %xmm6\n"
                       "\tpxor    %xmm3, %xmm4\n"
                       "\tpxor    %xmm2, %xmm6\n"
                       "\tpxor    %xmm2, %xmm5\n"
                       "\tpxor    %xmm2, %xmm3\n"
                       "\tpxor    %xmm1, %xmm5\n"
                       "\tpxor    %xmm1, %xmm4\n"
                       "\tpxor    %xmm1, %xmm2\n"
                       "\tpxor    %xmm0, %xmm4\n"
                       "\tpxor    %xmm0, %xmm3\n"
                       "\tpxor    %xmm0, %xmm1\n");
}
```
user: Demonstrate the C code that generates the assembly output below:

```asm
<gf8mul_00011011>:
  endbr64
  pxor   %xmm7,%xmm6
  pxor   %xmm7,%xmm5
  pxor   %xmm7,%xmm4
  pxor   %xmm7,%xmm3
  pxor   %xmm7,%xmm1
  pxor   %xmm7,%xmm0
  pxor   %xmm6,%xmm7
  pxor   %xmm6,%xmm5
  pxor   %xmm6,%xmm4
  pxor   %xmm6,%xmm3
  pxor   %xmm6,%xmm2
  pxor   %xmm5,%xmm7
  pxor   %xmm5,%xmm4
  pxor   %xmm5,%xmm2
  pxor   %xmm5,%xmm1
  pxor   %xmm4,%xmm7
  pxor   %xmm4,%xmm1
  pxor   %xmm4,%xmm0
  pxor   %xmm7,%xmm4
  pxor   %xmm3,%xmm7
  pxor   %xmm3,%xmm6
  pxor   %xmm3,%xmm4
  pxor   %xmm2,%xmm6
  pxor   %xmm2,%xmm5
  pxor   %xmm2,%xmm3
  pxor   %xmm1,%xmm5
  pxor   %xmm1,%xmm4
  pxor   %xmm1,%xmm2
  pxor   %xmm0,%xmm4
  pxor   %xmm0,%xmm3
  pxor   %xmm0,%xmm1
  ret
```

assistant: ```c
void gf8mul_00011011(void) {
  __asm__ __volatile__("\tpxor    %xmm7, %xmm6\n"
                       "\tpxor    %xmm7, %xmm5\n"
                       "\tpxor    %xmm7, %xmm4\n"
                       "\tpxor    %xmm7, %xmm3\n"
                       "\tpxor    %xmm7, %xmm1\n"
                       "\tpxor    %xmm7, %xmm0\n"
                       "\tpxor    %xmm6, %xmm7\n"
                       "\tpxor    %xmm6, %xmm5\n"
                       "\tpxor    %xmm6, %xmm4\n"
                       "\tpxor    %xmm6, %xmm3\n"
                       "\tpxor    %xmm6, %xmm2\n"
                       "\tpxor    %xmm5, %xmm7\n"
                       "\tpxor    %xmm5, %xmm4\n"
                       "\tpxor    %xmm5, %xmm2\n"
                       "\tpxor    %xmm5, %xmm1\n"
                       "\tpxor    %xmm4, %xmm7\n"
                       "\tpxor    %xmm4, %xmm1\n"
                       "\tpxor    %xmm4, %xmm0\n"
                       "\tpxor    %xmm7, %xmm4\n"
                       "\tpxor    %xmm3, %xmm7\n"
                       "\tpxor    %xmm3, %xmm6\n"
                       "\tpxor    %xmm3, %xmm4\n"
                       "\tpxor    %xmm2, %xmm6\n"
                       "\tpxor    %xmm2, %xmm5\n"
                       "\tpxor    %xmm2, %xmm3\n"
                       "\tpxor    %xmm1, %xmm5\n"
                       "\tpxor    %xmm1, %xmm4\n"
                       "\tpxor    %xmm1, %xmm2\n"
                       "\tpxor    %xmm0, %xmm4\n"
                       "\tpxor    %xmm0, %xmm3\n"
                       "\tpxor    %xmm0, %xmm1\n");
}
```
user: What would the C source look like for the assembly code provided here?

```asm
<gf8mul_00011011>:
  endbr64
  pxor   %xmm7,%xmm6
  pxor   %xmm7,%xmm5
  pxor   %xmm7,%xmm4
  pxor   %xmm7,%xmm3
  pxor   %xmm7,%xmm1
  pxor   %xmm7,%xmm0
  pxor   %xmm6,%xmm7
  pxor   %xmm6,%xmm5
  pxor   %xmm6,%xmm4
  pxor   %xmm6,%xmm3
  pxor   %xmm6,%xmm2
  pxor   %xmm5,%xmm7
  pxor   %xmm5,%xmm4
  pxor   %xmm5,%xmm2
  pxor   %xmm5,%xmm1
  pxor   %xmm4,%xmm7
  pxor   %xmm4,%xmm1
  pxor   %xmm4,%xmm0
  pxor   %xmm7,%xmm4
  pxor   %xmm3,%xmm7
  pxor   %xmm3,%xmm6
  pxor   %xmm3,%xmm4
  pxor   %xmm2,%xmm6
  pxor   %xmm2,%xmm5
  pxor   %xmm2,%xmm3
  pxor   %xmm1,%xmm5
  pxor   %xmm1,%xmm4
  pxor   %xmm1,%xmm2
  pxor   %xmm0,%xmm4
  pxor   %xmm0,%xmm3
  pxor   %xmm0,%xmm1
  ret
```

assistant: ```c
void gf8mul_00011011(void) {
  __asm__ __volatile__("\tpxor    %xmm7, %xmm6\n"
                       "\tpxor    %xmm7, %xmm5\n"
                       "\tpxor    %xmm7, %xmm4\n"
                       "\tpxor    %xmm7, %xmm3\n"
                       "\tpxor    %xmm7, %xmm1\n"
                       "\tpxor    %xmm7, %xmm0\n"
                       "\tpxor    %xmm6, %xmm7\n"
                       "\tpxor    %xmm6, %xmm5\n"
                       "\tpxor    %xmm6, %xmm4\n"
                       "\tpxor    %xmm6, %xmm3\n"
                       "\tpxor    %xmm6, %xmm2\n"
                       "\tpxor    %xmm5, %xmm7\n"
                       "\tpxor    %xmm5, %xmm4\n"
                       "\tpxor    %xmm5, %xmm2\n"
                       "\tpxor    %xmm5, %xmm1\n"
                       "\tpxor    %xmm4, %xmm7\n"
                       "\tpxor    %xmm4, %xmm1\n"
                       "\tpxor    %xmm4, %xmm0\n"
                       "\tpxor    %xmm7, %xmm4\n"
                       "\tpxor    %xmm3, %xmm7\n"
                       "\tpxor    %xmm3, %xmm6\n"
                       "\tpxor    %xmm3, %xmm4\n"
                       "\tpxor    %xmm2, %xmm6\n"
                       "\tpxor    %xmm2, %xmm5\n"
                       "\tpxor    %xmm2, %xmm3\n"
                       "\tpxor    %xmm1, %xmm5\n"
                       "\tpxor    %xmm1, %xmm4\n"
                       "\tpxor    %xmm1, %xmm2\n"
                       "\tpxor    %xmm0, %xmm4\n"
                       "\tpxor    %xmm0, %xmm3\n"
                       "\tpxor    %xmm0, %xmm1\n");
}
```
user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<gf8mul_00011011>:
  endbr64
  pxor   %xmm7,%xmm6
  pxor   %xmm7,%xmm5
  pxor   %xmm7,%xmm4
  pxor   %xmm7,%xmm3
  pxor   %xmm7,%xmm1
  pxor   %xmm7,%xmm0
  pxor   %xmm6,%xmm7
  pxor   %xmm6,%xmm5
  pxor   %xmm6,%xmm4
  pxor   %xmm6,%xmm3
  pxor   %xmm6,%xmm2
  pxor   %xmm5,%xmm7
  pxor   %xmm5,%xmm4
  pxor   %xmm5,%xmm2
  pxor   %xmm5,%xmm1
  pxor   %xmm4,%xmm7
  pxor   %xmm4,%xmm1
  pxor   %xmm4,%xmm0
  pxor   %xmm7,%xmm4
  pxor   %xmm3,%xmm7
  pxor   %xmm3,%xmm6
  pxor   %xmm3,%xmm4
  pxor   %xmm2,%xmm6
  pxor   %xmm2,%xmm5
  pxor   %xmm2,%xmm3
  pxor   %xmm1,%xmm5
  pxor   %xmm1,%xmm4
  pxor   %xmm1,%xmm2
  pxor   %xmm0,%xmm4
  pxor   %xmm0,%xmm3
  pxor   %xmm0,%xmm1
  ret
```

assistant: ```c
void gf8mul_00011011(void) {
  __asm__ __volatile__("\tpxor    %xmm7, %xmm6\n"
                       "\tpxor    %xmm7, %xmm5\n"
                       "\tpxor    %xmm7, %xmm4\n"
                       "\tpxor    %xmm7, %xmm3\n"
                       "\tpxor    %xmm7, %xmm1\n"
                       "\tpxor    %xmm7, %xmm0\n"
                       "\tpxor    %xmm6, %xmm7\n"
                       "\tpxor    %xmm6, %xmm5\n"
                       "\tpxor    %xmm6, %xmm4\n"
                       "\tpxor    %xmm6, %xmm3\n"
                       "\tpxor    %xmm6, %xmm2\n"
                       "\tpxor    %xmm5, %xmm7\n"
                       "\tpxor    %xmm5, %xmm4\n"
                       "\tpxor    %xmm5, %xmm2\n"
                       "\tpxor    %xmm5, %xmm1\n"
                       "\tpxor    %xmm4, %xmm7\n"
                       "\tpxor    %xmm4, %xmm1\n"
                       "\tpxor    %xmm4, %xmm0\n"
                       "\tpxor    %xmm7, %xmm4\n"
                       "\tpxor    %xmm3, %xmm7\n"
                       "\tpxor    %xmm3, %xmm6\n"
                       "\tpxor    %xmm3, %xmm4\n"
                       "\tpxor    %xmm2, %xmm6\n"
                       "\tpxor    %xmm2, %xmm5\n"
                       "\tpxor    %xmm2, %xmm3\n"
                       "\tpxor    %xmm1, %xmm5\n"
                       "\tpxor    %xmm1, %xmm4\n"
                       "\tpxor    %xmm1, %xmm2\n"
                       "\tpxor    %xmm0, %xmm4\n"
                       "\tpxor    %xmm0, %xmm3\n"
                       "\tpxor    %xmm0, %xmm1\n");
}
```
user: 请将以下的汇编代码转换成C语言代码：

```asm
<Sfile_fgets_n>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %esi,-0x1c(%rbp)
  mov    %rdx,-0x28(%rbp)
  mov    %ecx,-0x20(%rbp)
  mov    -0x28(%rbp),%rdx
  mov    -0x1c(%rbp),%ecx
  mov    -0x18(%rbp),%rax
  mov    %ecx,%esi
  mov    %rax,%rdi
  call   <fgets@plt>
  mov    %rax,-0x8(%rbp)
  cmpq   $0x0,-0x8(%rbp)
  jne    L53
  mov    $0x0,%eax
  jmp    L61
L53:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,-0xc(%rbp)
  cmpl   $0x0,-0xc(%rbp)
  jle    L36
  mov    -0x20(%rbp),%eax
  and    $0x1,%eax
  test   %eax,%eax
  jne    L36
  mov    -0xc(%rbp),%eax
  cltq
  lea    -0x1(%rax),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0xd,%al
  jne    L36
  subl   $0x1,-0xc(%rbp)
  mov    -0xc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
L36:
  cmpl   $0x0,-0xc(%rbp)
  jle    L34
  mov    -0xc(%rbp),%eax
  cltq
  lea    -0x1(%rax),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0xa,%al
  jne    L34
  subl   $0x1,-0xc(%rbp)
  mov    -0xc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
L34:
  cmpl   $0x0,-0xc(%rbp)
  jle    L72
  mov    -0x20(%rbp),%eax
  and    $0x1,%eax
  test   %eax,%eax
  jne    L72
  mov    -0xc(%rbp),%eax
  cltq
  lea    -0x1(%rax),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0xd,%al
  jne    L72
  subl   $0x1,-0xc(%rbp)
  mov    -0xc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
L72:
  mov    -0x8(%rbp),%rax
L61:
  leave
  ret
```

assistant: ```c
char *Sfile_fgets_n(char *line, int maxl, FILE *fp, int flag) {
  int l;
  char *ret;
  ret = fgets(line, maxl, fp);
  if (ret == NULL)
    return (NULL);
  l = strlen(line);
  if (l > 0 && !(flag & 1))
    if (line[l - 1] == '\r')
      line[--l] = 0;
  if (l > 0)
    if (line[l - 1] == '\n')
      line[--l] = 0;
  if (l > 0 && !(flag & 1))
    if (line[l - 1] == '\r')
      line[--l] = 0;
  return (ret);
}
```
user: What would the C source look like for the assembly code provided here:

```asm
<Sfile_fgets_n>:
  endbr64
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%rbx
  mov    %ecx,%r12d
  call   <fgets@plt>
  mov    %rax,%rbp
  test   %rax,%rax
  je     L20
  mov    %rbx,%rdi
  call   <strlen@plt>
  test   %eax,%eax
  jle    L20
  and    $0x1,%r12d
  jne    L126
  movslq %eax,%rdx
  lea    -0x1(%rbx,%rdx,1),%rdx
  cmpb   $0xd,(%rdx)
  je     L106
L110:
  movslq %eax,%rdx
  lea    -0x1(%rbx,%rdx,1),%rdx
  cmpb   $0xa,(%rdx)
  je     L48
L113:
  cltq
  lea    -0x1(%rbx,%rax,1),%rax
  cmpb   $0xd,(%rax)
  je     L74
L20:
  mov    %rbp,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
L106:
  sub    $0x1,%eax
  movb   $0x0,(%rdx)
  test   %eax,%eax
  jg     L110
  jmp    L20
L74:
  movb   $0x0,(%rax)
  jmp    L20
L126:
  movslq %eax,%rdx
  lea    -0x1(%rbx,%rdx,1),%rdx
  cmpb   $0xa,(%rdx)
  jne    L20
L48:
  sub    $0x1,%eax
  movb   $0x0,(%rdx)
  test   %eax,%eax
  jle    L20
  test   %r12d,%r12d
  jne    L20
  jmp    L113
```

assistant: ```c
char *Sfile_fgets_n(char *line, int maxl, FILE *fp, int flag) {
  int l;
  char *ret;
  ret = fgets(line, maxl, fp);
  if (ret == NULL)
    return (NULL);
  l = strlen(line);
  if (l > 0 && !(flag & 1))
    if (line[l - 1] == '\r')
      line[--l] = 0;
  if (l > 0)
    if (line[l - 1] == '\n')
      line[--l] = 0;
  if (l > 0 && !(flag & 1))
    if (line[l - 1] == '\r')
      line[--l] = 0;
  return (ret);
}
```
user: 请从给定的汇编指令推导出C源代码：

```asm
<Sfile_fgets_n>:
  endbr64
  push   %r12
  push   %rbp
  mov    %ecx,%ebp
  push   %rbx
  mov    %rdi,%rbx
  call   <fgets@plt>
  mov    %rax,%r12
  test   %rax,%rax
  je     L46
  mov    %rbx,%rdi
  call   <strlen@plt>
  test   %eax,%eax
  jle    L46
  movslq %eax,%rsi
  and    $0x1,%ebp
  lea    -0x1(%rbx,%rsi,1),%rdx
  movzbl (%rdx),%ecx
  jne    L80
  cmp    $0xd,%cl
  je     L0
  cmp    $0xa,%cl
  jne    L46
L42:
  movb   $0x0,(%rdx)
  sub    $0x1,%eax
  je     L46
  cltq
  lea    -0x1(%rbx,%rax,1),%rdx
  movzbl (%rdx),%ecx
L84:
  cmp    $0xd,%cl
  jne    L46
L71:
  movb   $0x0,(%rdx)
L46:
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
  nopw   0x0(%rax,%rax,1)
L80:
  cmp    $0xa,%cl
  je     L71
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
  nopl   (%rax)
L0:
  movb   $0x0,(%rdx)
  sub    $0x1,%eax
  je     L46
  lea    -0x2(%rbx,%rsi,1),%rdx
  movzbl (%rdx),%ecx
  cmp    $0xa,%cl
  jne    L84
  jmp    L42
```

assistant: ```c
char *Sfile_fgets_n(char *line, int maxl, FILE *fp, int flag) {
  int l;
  char *ret;
  ret = fgets(line, maxl, fp);
  if (ret == NULL)
    return (NULL);
  l = strlen(line);
  if (l > 0 && !(flag & 1))
    if (line[l - 1] == '\r')
      line[--l] = 0;
  if (l > 0)
    if (line[l - 1] == '\n')
      line[--l] = 0;
  if (l > 0 && !(flag & 1))
    if (line[l - 1] == '\r')
      line[--l] = 0;
  return (ret);
}
```