ylfeng/ReF-Decompile-dataset huggingface dataset:
user: Demonstrate the C code that generates the assembly output below:

```asm
<appendstring>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    %rcx,-0x40(%rbp)
  mov    -0x30(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %rax,-0x20(%rbp)
  mov    -0x38(%rbp),%rax
  mov    (%rax),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x40(%rbp),%rax
  mov    (%rax),%rax
  cmp    %rax,-0x18(%rbp)
  jb     L22
  mov    -0x18(%rbp),%rax
  add    %rax,%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <realloc@plt>
  mov    %rax,-0x8(%rbp)
  cmpq   $0x0,-0x8(%rbp)
  je     L28
  mov    -0x8(%rbp),%rax
  mov    %rax,-0x28(%rbp)
  mov    -0x40(%rbp),%rax
  mov    -0x10(%rbp),%rdx
  mov    %rdx,(%rax)
  jmp    L22
L28:
  mov    $0x0,%eax
  jmp    L20
L22:
  mov    -0x38(%rbp),%rax
  mov    (%rax),%rdx
  mov    -0x28(%rbp),%rax
  add    %rax,%rdx
  mov    -0x30(%rbp),%rax
  mov    %rax,%rsi
  mov    %rdx,%rdi
  call   <strcpy@plt>
  mov    -0x38(%rbp),%rax
  mov    (%rax),%rdx
  mov    -0x20(%rbp),%rax
  add    %rax,%rdx
  mov    -0x38(%rbp),%rax
  mov    %rdx,(%rax)
  mov    -0x28(%rbp),%rax
L20:
  leave
  ret
```

assistant: ```c
char *appendstring(char *string, char *buffer, size_t *stringlen, size_t *stralloc) {
  size_t len = strlen(buffer);
  size_t needed_len = len + *stringlen;
  if (needed_len >= *stralloc) {
    char *newptr;
    size_t newsize = needed_len * 2;
    newptr = realloc(string, newsize);
    if (newptr) {
      string = newptr;
      *stralloc = newsize;
    } else
      return NULL;
  }
  strcpy(&string[*stringlen], buffer);
  *stringlen += len;
  return string;
}
```
user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<appendstring>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  mov    %rdi,%rbx
  mov    %rsi,%r13
  mov    %rdx,%rbp
  mov    %rcx,%r14
  mov    %rsi,%rdi
  call   <strlen@plt>
  mov    %rax,%r12
  add    0x0(%rbp),%rax
  cmp    %rax,(%r14)
  ja     L12
  lea    (%rax,%rax,1),%r15
  mov    %r15,%rsi
  mov    %rbx,%rdi
  call   <realloc@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  je     L3
  mov    %r15,(%r14)
L12:
  mov    %rbx,%rdi
  add    0x0(%rbp),%rdi
  mov    %r13,%rsi
  call   <strcpy@plt>
  add    %r12,0x0(%rbp)
  mov    %rbx,%rax
L3:
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
char *appendstring(char *string, char *buffer, size_t *stringlen, size_t *stralloc) {
  size_t len = strlen(buffer);
  size_t needed_len = len + *stringlen;
  if (needed_len >= *stralloc) {
    char *newptr;
    size_t newsize = needed_len * 2;
    newptr = realloc(string, newsize);
    if (newptr) {
      string = newptr;
      *stralloc = newsize;
    } else
      return NULL;
  }
  strcpy(&string[*stringlen], buffer);
  *stringlen += len;
  return string;
}
```
user: Demonstrate the C code that generates the assembly output below:

```asm
<appendstring>:
  endbr64
  push   %r15
  push   %r14
  mov    %rsi,%r14
  push   %r13
  mov    %rcx,%r13
  push   %r12
  push   %rbp
  mov    %rdi,%rbp
  mov    %rsi,%rdi
  push   %rbx
  mov    %rdx,%rbx
  sub    $0x8,%rsp
  call   <strlen@plt>
  mov    (%rbx),%rdi
  mov    %rax,%r12
  add    %rdi,%rax
  cmp    %rax,0x0(%r13)
  ja     L11
  lea    (%rax,%rax,1),%r15
  mov    %rbp,%rdi
  mov    %r15,%rsi
  call   <realloc@plt>
  mov    %rax,%rbp
  test   %rax,%rax
  je     L10
  mov    %r15,0x0(%r13)
  mov    (%rbx),%rdi
L11:
  add    %rbp,%rdi
  mov    %r14,%rsi
  call   <strcpy@plt>
  add    %r12,(%rbx)
  mov    %rbp,%rax
L12:
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L10:
  xor    %eax,%eax
  jmp    L12
```

assistant: ```c
char *appendstring(char *string, char *buffer, size_t *stringlen, size_t *stralloc) {
  size_t len = strlen(buffer);
  size_t needed_len = len + *stringlen;
  if (needed_len >= *stralloc) {
    char *newptr;
    size_t newsize = needed_len * 2;
    newptr = realloc(string, newsize);
    if (newptr) {
      string = newptr;
      *stralloc = newsize;
    } else
      return NULL;
  }
  strcpy(&string[*stringlen], buffer);
  *stringlen += len;
  return string;
}
```
user: What is the c source code of the assembly code below?

```asm
<appendstring>:
  endbr64
  push   %r15
  push   %r14
  mov    %rsi,%r14
  push   %r13
  mov    %rcx,%r13
  push   %r12
  push   %rbp
  mov    %rdi,%rbp
  mov    %rsi,%rdi
  push   %rbx
  mov    %rdx,%rbx
  sub    $0x8,%rsp
  call   <strlen@plt>
  mov    (%rbx),%rdi
  mov    %rax,%r12
  add    %rdi,%rax
  cmp    %rax,0x0(%r13)
  ja     L7
  lea    (%rax,%rax,1),%r15
  mov    %rbp,%rdi
  mov    %r15,%rsi
  call   <realloc@plt>
  mov    %rax,%rbp
  test   %rax,%rax
  je     L1
  mov    %r15,0x0(%r13)
  mov    (%rbx),%rdi
L7:
  add    %rbp,%rdi
  mov    %r14,%rsi
  call   <strcpy@plt>
  add    %r12,(%rbx)
  mov    %rbp,%rax
L27:
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L1:
  xor    %eax,%eax
  jmp    L27
```

assistant: ```c
char *appendstring(char *string, char *buffer, size_t *stringlen, size_t *stralloc) {
  size_t len = strlen(buffer);
  size_t needed_len = len + *stringlen;
  if (needed_len >= *stralloc) {
    char *newptr;
    size_t newsize = needed_len * 2;
    newptr = realloc(string, newsize);
    if (newptr) {
      string = newptr;
      *stralloc = newsize;
    } else
      return NULL;
  }
  strcpy(&string[*stringlen], buffer);
  *stringlen += len;
  return string;
}
```
user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<main>:
  endbr64
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  lea    D72(%rip),%rdi
  call   <printf@plt>
  lea    0xc(%rsp),%rsi
  lea    D11(%rip),%rdi
  call   <scanf@plt>
  cmpl   $0x17,0xc(%rsp)
  ja     L26
  lea    D17(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    0x10(%rsp),%rsi
  lea    D11(%rip),%rdi
  call   <scanf@plt>
  cmpl   $0x3b,0x10(%rsp)
  ja     L16
  lea    D46(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    0x14(%rsp),%rsi
  lea    D11(%rip),%rdi
  call   <scanf@plt>
  mov    0x14(%rsp),%edx
  cmp    $0x3b,%edx
  ja     L57
  mov    0x10(%rsp),%esi
  mov    0xc(%rsp),%edi
  call   <secondsSinceTwelve@plt>
  mov    %eax,%esi
  lea    D86(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0x0,%eax
L1:
  mov    0x18(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L64
  add    $0x28,%rsp
  ret
L26:
  lea    D13(%rip),%rdi
  call   <puts@plt>
  mov    $0xffffffff,%eax
  jmp    L1
L16:
  lea    D26(%rip),%rdi
  call   <puts@plt>
  mov    $0xffffffff,%eax
  jmp    L1
L57:
  lea    D92(%rip),%rdi
  call   <puts@plt>
  mov    $0xffffffff,%eax
  jmp    L1
L64:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: parse_data
arguments: data_label: D72
type: string
name: parse_data
arguments: data_label: D11
type: string
name: parse_data
arguments: data_label: D17
type: string
name: parse_data
arguments: data_label: D46
type: string
name: parse_data
arguments: data_label: D86
type: string
name: parse_data
arguments: data_label: D13
type: string
name: parse_data
arguments: data_label: D26
type: string
name: parse_data
arguments: data_label: D92
type: string

tool: D72: Enter hours: 

tool: D11: %d

tool: D17: Enter minutes: 

tool: D46: Enter seconds: 

tool: D86: It has been %d seconds since 12 O'clock.


tool: D13: Invalid value for hours entered!

tool: D26: Invalid value for minutes entered!

tool: D92: Invalid value for seconds entered!

assistant: ```c
int main() {
  int hours, minutes, seconds;
  int result;
  printf("Enter hours: ");
  scanf("%d", &hours);
  if (hours < 0 || hours > 23) {
    printf("Invalid value for hours entered!\n");
    return -1;
  }
  printf("Enter minutes: ");
  scanf("%d", &minutes);
  if (minutes < 0 || minutes > 59) {
    printf("Invalid value for minutes entered!\n");
    return -1;
  }
  printf("Enter seconds: ");
  scanf("%d", &seconds);
  if (seconds < 0 || seconds > 59) {
    printf("Invalid value for seconds entered!\n");
    return -1;
  }
  result = secondsSinceTwelve(hours, minutes, seconds);
  printf("It has been %d seconds since 12 O'clock.\n", result);
  return 0;
}
```
user: Converte this assembly snippet into its equivalent C code:

```asm
<main>:
  endbr64
  push   %rbp
  lea    D66(%rip),%rdi
  lea    D47(%rip),%rbp
  sub    $0x20,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  call   <printf@plt>
  lea    0xc(%rsp),%rsi
  mov    %rbp,%rdi
  call   <scanf@plt>
  cmpl   $0x17,0xc(%rsp)
  ja     L23
  lea    D16(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    0x10(%rsp),%rsi
  mov    %rbp,%rdi
  call   <scanf@plt>
  cmpl   $0x3b,0x10(%rsp)
  ja     L8
  lea    D54(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    0x14(%rsp),%rsi
  mov    %rbp,%rdi
  call   <scanf@plt>
  mov    0x14(%rsp),%edx
  cmp    $0x3b,%edx
  ja     L24
  mov    0x10(%rsp),%esi
  mov    0xc(%rsp),%edi
  call   <secondsSinceTwelve@plt>
  lea    D21(%rip),%rdi
  mov    %eax,%esi
  xor    %eax,%eax
  call   <printf@plt>
  xor    %eax,%eax
L6:
  mov    0x18(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L62
  add    $0x20,%rsp
  pop    %rbp
  ret
L23:
  lea    D38(%rip),%rdi
  call   <puts@plt>
  or     $0xffffffff,%eax
  jmp    L6
L8:
  lea    D29(%rip),%rdi
  call   <puts@plt>
  or     $0xffffffff,%eax
  jmp    L6
L24:
  lea    D42(%rip),%rdi
  call   <puts@plt>
  or     $0xffffffff,%eax
  jmp    L6
L62:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: tag: D66
data_type: string
name: extract_symbolic_data
arguments: tag: D47
data_type: string
name: extract_symbolic_data
arguments: tag: D16
data_type: string
name: extract_symbolic_data
arguments: tag: D54
data_type: string
name: extract_symbolic_data
arguments: tag: D21
data_type: string
name: extract_symbolic_data
arguments: tag: D38
data_type: string
name: extract_symbolic_data
arguments: tag: D29
data_type: string
name: extract_symbolic_data
arguments: tag: D42
data_type: string

tool: D66: Enter hours: 

tool: D47: %d

tool: D16: Enter minutes: 

tool: D54: Enter seconds: 

tool: D21: It has been %d seconds since 12 O'clock.


tool: D38: Invalid value for hours entered!

tool: D29: Invalid value for minutes entered!

tool: D42: Invalid value for seconds entered!

assistant: ```c
int main() {
  int hours, minutes, seconds;
  int result;
  printf("Enter hours: ");
  scanf("%d", &hours);
  if (hours < 0 || hours > 23) {
    printf("Invalid value for hours entered!\n");
    return -1;
  }
  printf("Enter minutes: ");
  scanf("%d", &minutes);
  if (minutes < 0 || minutes > 59) {
    printf("Invalid value for minutes entered!\n");
    return -1;
  }
  printf("Enter seconds: ");
  scanf("%d", &seconds);
  if (seconds < 0 || seconds > 59) {
    printf("Invalid value for seconds entered!\n");
    return -1;
  }
  result = secondsSinceTwelve(hours, minutes, seconds);
  printf("It has been %d seconds since 12 O'clock.\n", result);
  return 0;
}
```
user: 这段汇编代码用C语言表示是什么样的:

```asm
<main>:
  endbr64
  push   %rbp
  lea    D62(%rip),%rdi
  lea    D71(%rip),%rbp
  sub    $0x20,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  call   <printf@plt>
  lea    0xc(%rsp),%rsi
  mov    %rbp,%rdi
  call   <scanf@plt>
  cmpl   $0x17,0xc(%rsp)
  ja     L55
  lea    D36(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    0x10(%rsp),%rsi
  mov    %rbp,%rdi
  call   <scanf@plt>
  cmpl   $0x3b,0x10(%rsp)
  ja     L49
  lea    D52(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    0x14(%rsp),%rsi
  mov    %rbp,%rdi
  call   <scanf@plt>
  mov    0x14(%rsp),%edx
  cmp    $0x3b,%edx
  ja     L9
  mov    0x10(%rsp),%esi
  mov    0xc(%rsp),%edi
  call   <secondsSinceTwelve@plt>
  lea    D59(%rip),%rdi
  mov    %eax,%esi
  xor    %eax,%eax
  call   <printf@plt>
  xor    %eax,%eax
L47:
  mov    0x18(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L46
  add    $0x20,%rsp
  pop    %rbp
  ret
L55:
  lea    D46(%rip),%rdi
  call   <puts@plt>
  or     $0xffffffff,%eax
  jmp    L47
L49:
  lea    D73(%rip),%rdi
  call   <puts@plt>
  or     $0xffffffff,%eax
  jmp    L47
L9:
  lea    D17(%rip),%rdi
  call   <puts@plt>
  or     $0xffffffff,%eax
  jmp    L47
L46:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: data_label: D62
data_type: string
name: extract_symbolic_data
arguments: data_label: D71
data_type: string
name: extract_symbolic_data
arguments: data_label: D36
data_type: string
name: extract_symbolic_data
arguments: data_label: D52
data_type: string
name: extract_symbolic_data
arguments: data_label: D59
data_type: string
name: extract_symbolic_data
arguments: data_label: D46
data_type: string
name: extract_symbolic_data
arguments: data_label: D73
data_type: string
name: extract_symbolic_data
arguments: data_label: D17
data_type: string

tool: D62: Enter hours: 

tool: D71: %d

tool: D36: Enter minutes: 

tool: D52: Enter seconds: 

tool: D59: It has been %d seconds since 12 O'clock.


tool: D46: Invalid value for hours entered!

tool: D73: Invalid value for minutes entered!

tool: D17: Invalid value for seconds entered!

assistant: ```c
int main() {
  int hours, minutes, seconds;
  int result;
  printf("Enter hours: ");
  scanf("%d", &hours);
  if (hours < 0 || hours > 23) {
    printf("Invalid value for hours entered!\n");
    return -1;
  }
  printf("Enter minutes: ");
  scanf("%d", &minutes);
  if (minutes < 0 || minutes > 59) {
    printf("Invalid value for minutes entered!\n");
    return -1;
  }
  printf("Enter seconds: ");
  scanf("%d", &seconds);
  if (seconds < 0 || seconds > 59) {
    printf("Invalid value for seconds entered!\n");
    return -1;
  }
  result = secondsSinceTwelve(hours, minutes, seconds);
  printf("It has been %d seconds since 12 O'clock.\n", result);
  return 0;
}
```
user: 下面的汇编指令对应的C源代码是什么：

```asm
<htoi>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x18(%rbp)
  movl   $0x0,-0x8(%rbp)
  movl   $0x0,-0x4(%rbp)
  jmp    L17
L24:
  cmpl   $0xff,-0x8(%rbp)
  jbe    L95
  mov    $0x0,%eax
  jmp    L16
L95:
  mov    -0x4(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x2f,%al
  jle    L32
  mov    -0x4(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x39,%al
  jg     L32
  mov    -0x8(%rbp),%eax
  shl    $0x4,%eax
  mov    %eax,%ecx
  mov    -0x4(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  add    %ecx,%eax
  sub    $0x30,%eax
  mov    %eax,-0x8(%rbp)
  jmp    L66
L32:
  mov    -0x4(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x40,%al
  jle    L2
  mov    -0x4(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x46,%al
  jg     L2
  mov    -0x8(%rbp),%eax
  shl    $0x4,%eax
  mov    %eax,%ecx
  mov    -0x4(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  add    %ecx,%eax
  sub    $0x37,%eax
  mov    %eax,-0x8(%rbp)
  jmp    L66
L2:
  mov    $0x0,%eax
  jmp    L16
L66:
  addl   $0x1,-0x4(%rbp)
L17:
  cmpl   $0x1,-0x4(%rbp)
  jle    L24
  mov    -0x8(%rbp),%eax
L16:
  pop    %rbp
  ret
```

assistant: ```c
unsigned int htoi(char *s) {
  unsigned int val = 0;
  for (int x = 0; x < 2; x++) {
    if (val > 255)
      return 0;
    else if (s[x] >= '0' && s[x] <= '9') {
      val = val * 16 + s[x] - '0';
    } else if (s[x] >= 'A' && s[x] <= 'F') {
      val = val * 16 + s[x] - 'A' + 10;
    } else
      return 0;
  }
  return val;
}
```
user: Demonstrate the C code that generates the assembly output below:

```asm
<htoi>:
  endbr64
  movzbl (%rdi),%eax
  lea    -0x30(%rax),%edx
  cmp    $0x9,%dl
  jbe    L19
  lea    -0x41(%rax),%edx
  cmp    $0x5,%dl
  ja     L48
  movsbl %al,%eax
  sub    $0x37,%eax
  jmp    L22
L19:
  movsbl %al,%eax
  sub    $0x30,%eax
L22:
  movzbl 0x1(%rdi),%edx
  lea    -0x30(%rdx),%ecx
  cmp    $0x9,%cl
  ja     L44
  shl    $0x4,%eax
  movsbl %dl,%edx
  lea    -0x30(%rax,%rdx,1),%eax
  ret
L44:
  lea    -0x41(%rdx),%ecx
  cmp    $0x5,%cl
  ja     L29
  shl    $0x4,%eax
  movsbl %dl,%edx
  lea    -0x37(%rax,%rdx,1),%eax
  ret
L48:
  mov    $0x0,%eax
  ret
L29:
  mov    $0x0,%eax
  ret
```

assistant: ```c
unsigned int htoi(char *s) {
  unsigned int val = 0;
  for (int x = 0; x < 2; x++) {
    if (val > 255)
      return 0;
    else if (s[x] >= '0' && s[x] <= '9') {
      val = val * 16 + s[x] - '0';
    } else if (s[x] >= 'A' && s[x] <= 'F') {
      val = val * 16 + s[x] - 'A' + 10;
    } else
      return 0;
  }
  return val;
}
```
user: 下面的汇编指令对应的C源代码是什么:

```asm
<htoi>:
  endbr64
  movsbl (%rdi),%eax
  lea    -0x30(%rax),%edx
  cmp    $0x9,%dl
  jbe    L10
  lea    -0x41(%rax),%edx
  cmp    $0x5,%dl
  ja     L17
  movsbl 0x1(%rdi),%edx
  sub    $0x37,%eax
  lea    -0x30(%rdx),%ecx
  cmp    $0x9,%cl
  jbe    L48
L27:
  lea    -0x41(%rdx),%ecx
  cmp    $0x5,%cl
  ja     L17
  shl    $0x4,%eax
  lea    -0x37(%rax,%rdx,1),%eax
  ret
  cs nopw 0x0(%rax,%rax,1)
L10:
  movsbl 0x1(%rdi),%edx
  sub    $0x30,%eax
  lea    -0x30(%rdx),%ecx
  cmp    $0x9,%cl
  ja     L27
L48:
  shl    $0x4,%eax
  lea    -0x30(%rax,%rdx,1),%eax
  ret
  nopw   0x0(%rax,%rax,1)
L17:
  xor    %eax,%eax
  ret
```

assistant: ```c
unsigned int htoi(char *s) {
  unsigned int val = 0;
  for (int x = 0; x < 2; x++) {
    if (val > 255)
      return 0;
    else if (s[x] >= '0' && s[x] <= '9') {
      val = val * 16 + s[x] - '0';
    } else if (s[x] >= 'A' && s[x] <= 'F') {
      val = val * 16 + s[x] - 'A' + 10;
    } else
      return 0;
  }
  return val;
}
```
user: What is the c source code of the assembly code below?

```asm
<htoi>:
  endbr64
  movsbl (%rdi),%eax
  lea    -0x30(%rax),%edx
  cmp    $0x9,%dl
  jbe    L40
  lea    -0x41(%rax),%edx
  cmp    $0x5,%dl
  ja     L45
  movsbl 0x1(%rdi),%edx
  sub    $0x37,%eax
  lea    -0x30(%rdx),%ecx
  cmp    $0x9,%cl
  jbe    L18
L12:
  lea    -0x41(%rdx),%ecx
  cmp    $0x5,%cl
  ja     L45
  shl    $0x4,%eax
  lea    -0x37(%rax,%rdx,1),%eax
  ret
  cs nopw 0x0(%rax,%rax,1)
L40:
  movsbl 0x1(%rdi),%edx
  sub    $0x30,%eax
  lea    -0x30(%rdx),%ecx
  cmp    $0x9,%cl
  ja     L12
L18:
  shl    $0x4,%eax
  lea    -0x30(%rax,%rdx,1),%eax
  ret
  nopw   0x0(%rax,%rax,1)
L45:
  xor    %eax,%eax
  ret
```

assistant: ```c
unsigned int htoi(char *s) {
  unsigned int val = 0;
  for (int x = 0; x < 2; x++) {
    if (val > 255)
      return 0;
    else if (s[x] >= '0' && s[x] <= '9') {
      val = val * 16 + s[x] - '0';
    } else if (s[x] >= 'A' && s[x] <= 'F') {
      val = val * 16 + s[x] - 'A' + 10;
    } else
      return 0;
  }
  return val;
}
```
user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<ez_writer_write_track>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %esi,-0x1c(%rbp)
  mov    %rdx,-0x28(%rbp)
  mov    %rcx,-0x30(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movb   $0x1b,-0xa(%rbp)
  mov    -0x1c(%rbp),%eax
  and    $0xe,%eax
  mov    %al,-0x9(%rbp)
  lea    -0xa(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  mov    $0x2,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <serial_port_write@plt>
  test   %eax,%eax
  jne    L21
  mov    $0x0,%eax
  jmp    L18
L21:
  mov    -0x30(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memchr@plt>
  test   %rax,%rax
  je     L6
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %rax,-0x30(%rbp)
L6:
  cmpq   $0x0,-0x30(%rbp)
  jne    L63
  mov    $0x1,%eax
  jmp    L18
L63:
  mov    -0x30(%rbp),%rax
  lea    -0x2(%rax),%rdx
  mov    -0x28(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    -0x18(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <serial_port_write@plt>
  test   %eax,%eax
  jne    L17
  mov    $0x0,%eax
  jmp    L18
L17:
  mov    $0x1,%eax
L18:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L44
  call   <__stack_chk_fail@plt>
L44:
  leave
  ret
```

assistant: ```c
bool ez_writer_write_track(struct serial_port *sport, unsigned track, const char *trackdata, size_t len) {
  char track_begin[] = {'\x1b', track & (((1) << ((1) & (1 | 2 | 3))) | ((1) << ((2) & (1 | 2 | 3))) | ((1) << ((3) & (1 | 2 | 3))))};
  if (!serial_port_write(sport, track_begin, sizeof track_begin / sizeof track_begin[0]))
    return (false);
  if (memchr(trackdata, '\0', len) != NULL)
    len = strlen(trackdata);
  if (len == 0)
    return (true);
  if (!serial_port_write(sport, trackdata + 1, len - 2))
    return (false);
  return (true);
}
```
user: Demonstrate the C code that generates the assembly output below:

```asm
<ez_writer_write_track>:
  endbr64
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x10,%rsp
  mov    %rdi,%r12
  mov    %rdx,%rbp
  mov    %rcx,%rbx
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  movb   $0x1b,0x6(%rsp)
  and    $0xe,%esi
  mov    %sil,0x7(%rsp)
  lea    0x6(%rsp),%rsi
  mov    $0x2,%edx
  call   <serial_port_write@plt>
  test   %eax,%eax
  jne    L13
L23:
  mov    0x8(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L25
  add    $0x10,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
L13:
  mov    %rbx,%rdx
  mov    $0x0,%esi
  mov    %rbp,%rdi
  call   <memchr@plt>
  test   %rax,%rax
  je     L14
  mov    %rbp,%rdi
  call   <strlen@plt>
  mov    %rax,%rbx
L14:
  mov    $0x1,%eax
  test   %rbx,%rbx
  je     L23
  lea    -0x2(%rbx),%rdx
  lea    0x1(%rbp),%rsi
  mov    %r12,%rdi
  call   <serial_port_write@plt>
  test   %eax,%eax
  setne  %al
  movzbl %al,%eax
  jmp    L23
L25:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
bool ez_writer_write_track(struct serial_port *sport, unsigned track, const char *trackdata, size_t len) {
  char track_begin[] = {'\x1b', track & (((1) << ((1) & (1 | 2 | 3))) | ((1) << ((2) & (1 | 2 | 3))) | ((1) << ((3) & (1 | 2 | 3))))};
  if (!serial_port_write(sport, track_begin, sizeof track_begin / sizeof track_begin[0]))
    return (false);
  if (memchr(trackdata, '\0', len) != NULL)
    len = strlen(trackdata);
  if (len == 0)
    return (true);
  if (!serial_port_write(sport, trackdata + 1, len - 2))
    return (false);
  return (true);
}
```
user: 请从给定的汇编指令推导出C源代码:

```asm
<ez_writer_write_track>:
  endbr64
  push   %r12
  and    $0xe,%esi
  mov    %rdi,%r12
  push   %rbp
  mov    %rdx,%rbp
  mov    $0x2,%edx
  push   %rbx
  mov    %rcx,%rbx
  sub    $0x10,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  mov    %sil,0x7(%rsp)
  lea    0x6(%rsp),%rsi
  movb   $0x1b,0x6(%rsp)
  call   <serial_port_write@plt>
  test   %eax,%eax
  jne    L47
L13:
  mov    0x8(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L23
  add    $0x10,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
  xchg   %ax,%ax
L47:
  xor    %esi,%esi
  mov    %rbx,%rdx
  mov    %rbp,%rdi
  call   <memchr@plt>
  test   %rax,%rax
  je     L37
  mov    %rbp,%rdi
  call   <strlen@plt>
  mov    %rax,%rbx
L37:
  mov    $0x1,%eax
  test   %rbx,%rbx
  je     L13
  lea    -0x2(%rbx),%rdx
  lea    0x1(%rbp),%rsi
  mov    %r12,%rdi
  call   <serial_port_write@plt>
  test   %eax,%eax
  setne  %al
  movzbl %al,%eax
  jmp    L13
L23:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
bool ez_writer_write_track(struct serial_port *sport, unsigned track, const char *trackdata, size_t len) {
  char track_begin[] = {'\x1b', track & (((1) << ((1) & (1 | 2 | 3))) | ((1) << ((2) & (1 | 2 | 3))) | ((1) << ((3) & (1 | 2 | 3))))};
  if (!serial_port_write(sport, track_begin, sizeof track_begin / sizeof track_begin[0]))
    return (false);
  if (memchr(trackdata, '\0', len) != NULL)
    len = strlen(trackdata);
  if (len == 0)
    return (true);
  if (!serial_port_write(sport, trackdata + 1, len - 2))
    return (false);
  return (true);
}
```