ylfeng/ReF-Decompile-dataset huggingface dataset:
user: Converte this assembly snippet into its equivalent C code:

```asm
<uninitvar_mbstowcs>:
  endbr64
  xor    %edx,%edx
  xor    %esi,%esi
  xor    %edi,%edi
  jmp    1050 <mbstowcs@plt>
```

assistant: ```c
void uninitvar_mbstowcs(void) {
  wchar_t *ws;
  char *s;
  size_t n;
  (void)mbstowcs(ws, s, n);
}
```
user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<int8Copy>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x10,%rsp
  mov    %rdi,-0x8(%rbp)
  mov    %rsi,-0x10(%rbp)
  cmpq   $0x0,-0x8(%rbp)
  setne  %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  cmpq   $0x0,-0x10(%rbp)
  setne  %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x10(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x8(%rbp),%rax
  mov    %edx,(%rax)
  nop
  leave
  ret
```

assistant: ```c
void int8Copy(int8_t *dst, const int8_t *src) {
  assert(dst != NULL);
  assert(src != NULL);
  *dst = *src;
}
```
user: 请从给定的汇编指令推导出C源代码：

```asm
<int8Copy>:
  endbr64
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  mov    %rdi,%rbx
  mov    %rsi,%rbp
  test   %rdi,%rdi
  setne  %dil
  movzbl %dil,%edi
  call   <assert@plt>
  test   %rbp,%rbp
  setne  %dil
  movzbl %dil,%edi
  call   <assert@plt>
  mov    0x0(%rbp),%eax
  mov    %eax,(%rbx)
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  ret
```

assistant: ```c
void int8Copy(int8_t *dst, const int8_t *src) {
  assert(dst != NULL);
  assert(src != NULL);
  *dst = *src;
}
```
user: 请将以下的汇编代码转换成C语言代码：

```asm
<int8Copy>:
  endbr64
  push   %rbp
  mov    %rsi,%rbp
  push   %rbx
  mov    %rdi,%rbx
  xor    %edi,%edi
  sub    $0x8,%rsp
  test   %rbx,%rbx
  setne  %dil
  call   <assert@plt>
  xor    %edi,%edi
  test   %rbp,%rbp
  setne  %dil
  call   <assert@plt>
  mov    0x0(%rbp),%eax
  mov    %eax,(%rbx)
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  ret
```

assistant: ```c
void int8Copy(int8_t *dst, const int8_t *src) {
  assert(dst != NULL);
  assert(src != NULL);
  *dst = *src;
}
```
user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<int8Copy>:
  endbr64
  push   %rbp
  mov    %rsi,%rbp
  push   %rbx
  mov    %rdi,%rbx
  xor    %edi,%edi
  sub    $0x8,%rsp
  test   %rbx,%rbx
  setne  %dil
  call   <assert@plt>
  xor    %edi,%edi
  test   %rbp,%rbp
  setne  %dil
  call   <assert@plt>
  mov    0x0(%rbp),%eax
  mov    %eax,(%rbx)
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  ret
```

assistant: ```c
void int8Copy(int8_t *dst, const int8_t *src) {
  assert(dst != NULL);
  assert(src != NULL);
  *dst = *src;
}
```
user: 这段汇编代码用C语言表示是什么样的:

```asm
<Get_args>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x8(%rbp)
  mov    %rsi,-0x10(%rbp)
  mov    %rdx,-0x18(%rbp)
  mov    %rcx,-0x20(%rbp)
  mov    %r8,-0x28(%rbp)
  mov    %r9,-0x30(%rbp)
  mov    -0x8(%rbp),%rax
  add    $0x8,%rax
  mov    (%rax),%rax
  mov    $0xa,%edx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <strtol@plt>
  mov    -0x10(%rbp),%rdx
  mov    %eax,(%rdx)
  mov    -0x8(%rbp),%rax
  add    $0x10,%rax
  mov    (%rax),%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <strtof@plt>
  movd   %xmm0,%eax
  mov    -0x18(%rbp),%rdx
  mov    %eax,(%rdx)
  mov    -0x8(%rbp),%rax
  add    $0x18,%rax
  mov    (%rax),%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <strtof@plt>
  movd   %xmm0,%eax
  mov    -0x20(%rbp),%rdx
  mov    %eax,(%rdx)
  mov    -0x8(%rbp),%rax
  add    $0x20,%rax
  mov    (%rax),%rax
  mov    $0xa,%edx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <strtol@plt>
  mov    -0x28(%rbp),%rdx
  mov    %eax,(%rdx)
  mov    -0x8(%rbp),%rax
  add    $0x28,%rax
  mov    (%rax),%rax
  mov    $0xa,%edx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <strtol@plt>
  mov    -0x30(%rbp),%rdx
  mov    %eax,(%rdx)
  nop
  leave
  ret
```

assistant: ```c
void Get_args(char *argv[], int *bin_count_p, float *min_meas_p, float *max_meas_p, int *data_count_p, int *thread_count) {
  *bin_count_p = strtol(argv[1], NULL, 10);
  *min_meas_p = strtof(argv[2], NULL);
  *max_meas_p = strtof(argv[3], NULL);
  *data_count_p = strtol(argv[4], NULL, 10);
  *thread_count = strtol(argv[5], NULL, 10);
}
```
user: 请将以下的汇编代码转换成C语言代码：

```asm
<Get_args>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  mov    %rdi,%rbx
  mov    %rsi,%r15
  mov    %rdx,%r14
  mov    %rcx,%r13
  mov    %r8,%r12
  mov    %r9,%rbp
  mov    0x8(%rdi),%rdi
  mov    $0xa,%edx
  mov    $0x0,%esi
  call   <strtol@plt>
  mov    %eax,(%r15)
  mov    0x10(%rbx),%rdi
  mov    $0x0,%esi
  call   <strtof@plt>
  movss  %xmm0,(%r14)
  mov    0x18(%rbx),%rdi
  mov    $0x0,%esi
  call   <strtof@plt>
  movss  %xmm0,0x0(%r13)
  mov    0x20(%rbx),%rdi
  mov    $0xa,%edx
  mov    $0x0,%esi
  call   <strtol@plt>
  mov    %eax,(%r12)
  mov    0x28(%rbx),%rdi
  mov    $0xa,%edx
  mov    $0x0,%esi
  call   <strtol@plt>
  mov    %eax,0x0(%rbp)
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void Get_args(char *argv[], int *bin_count_p, float *min_meas_p, float *max_meas_p, int *data_count_p, int *thread_count) {
  *bin_count_p = strtol(argv[1], NULL, 10);
  *min_meas_p = strtof(argv[2], NULL);
  *max_meas_p = strtof(argv[3], NULL);
  *data_count_p = strtol(argv[4], NULL, 10);
  *thread_count = strtol(argv[5], NULL, 10);
}
```
user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<Get_args>:
  endbr64
  push   %r15
  mov    %rsi,%r15
  xor    %esi,%esi
  push   %r14
  mov    %rdx,%r14
  mov    $0xa,%edx
  push   %r13
  mov    %rcx,%r13
  push   %r12
  mov    %r8,%r12
  push   %rbp
  mov    %r9,%rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x8,%rsp
  mov    0x8(%rdi),%rdi
  call   <strtol@plt>
  mov    0x10(%rbx),%rdi
  xor    %esi,%esi
  mov    %eax,(%r15)
  call   <strtof@plt>
  mov    0x18(%rbx),%rdi
  xor    %esi,%esi
  movss  %xmm0,(%r14)
  call   <strtof@plt>
  mov    0x20(%rbx),%rdi
  mov    $0xa,%edx
  xor    %esi,%esi
  movss  %xmm0,0x0(%r13)
  call   <strtol@plt>
  mov    0x28(%rbx),%rdi
  mov    $0xa,%edx
  xor    %esi,%esi
  mov    %eax,(%r12)
  call   <strtol@plt>
  mov    %eax,0x0(%rbp)
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void Get_args(char *argv[], int *bin_count_p, float *min_meas_p, float *max_meas_p, int *data_count_p, int *thread_count) {
  *bin_count_p = strtol(argv[1], NULL, 10);
  *min_meas_p = strtof(argv[2], NULL);
  *max_meas_p = strtof(argv[3], NULL);
  *data_count_p = strtol(argv[4], NULL, 10);
  *thread_count = strtol(argv[5], NULL, 10);
}
```
user: Demonstrate the C code that generates the assembly output below:

```asm
<strlen>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x18(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  jne    L8
  mov    $0x0,%eax
  jmp    L16
L8:
  movq   $0x0,-0x8(%rbp)
  jmp    L15
L25:
  addq   $0x1,-0x8(%rbp)
L15:
  mov    -0x18(%rbp),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L25
  mov    -0x8(%rbp),%rax
L16:
  pop    %rbp
  ret
```

assistant: ```c
size_t strlen(const char *s) {
  size_t count;
  if (!s)
    return 0;
  for (count = 0; s[count]; count++)
    ;
  return count;
}
```
user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<strlen>:
  endbr64
  cmpb   $0x0,(%rdi)
  je     L17
  mov    $0x0,%eax
L10:
  add    $0x1,%rax
  cmpb   $0x0,(%rdi,%rax,1)
  jne    L10
  ret
L17:
  mov    $0x0,%eax
  ret
```

assistant: ```c
size_t strlen(const char *s) {
  size_t count;
  if (!s)
    return 0;
  for (count = 0; s[count]; count++)
    ;
  return count;
}
```
user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<strlen>:
  endbr64
  xor    %eax,%eax
  cmpb   $0x0,(%rdi)
  je     L0
  nopl   0x0(%rax,%rax,1)
L14:
  add    $0x1,%rax
  cmpb   $0x0,(%rdi,%rax,1)
  jne    L14
  ret
  nopl   0x0(%rax,%rax,1)
L0:
  ret
```

assistant: ```c
size_t strlen(const char *s) {
  size_t count;
  if (!s)
    return 0;
  for (count = 0; s[count]; count++)
    ;
  return count;
}
```
user: Translate the below assembly code into C programming language:

```asm
<strlen>:
  endbr64
  xor    %eax,%eax
  cmpb   $0x0,(%rdi)
  je     L0
  nopl   0x0(%rax,%rax,1)
L18:
  add    $0x1,%rax
  cmpb   $0x0,(%rdi,%rax,1)
  jne    L18
  ret
  nopl   0x0(%rax,%rax,1)
L0:
  ret
```

assistant: ```c
size_t strlen(const char *s) {
  size_t count;
  if (!s)
    return 0;
  for (count = 0; s[count]; count++)
    ;
  return count;
}
```
user: 下面的汇编指令对应的C源代码是什么：

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  lea    D29(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D6(%rip),%rax
  mov    %rax,%rdi
  call   <foo@plt>
  mov    %eax,%esi
  lea    D23(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  lea    D6(%rip),%rax
  mov    %rax,%rdi
  call   <bar@plt>
  mov    %eax,%esi
  lea    D15(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  lea    D34(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0x0,%eax
  pop    %rbp
  ret
```

tool_calls: name: extract_symbolic_data
arguments: label: D29
type_guessed: string
name: extract_symbolic_data
arguments: label: D6
type_guessed: string
name: extract_symbolic_data
arguments: label: D23
type_guessed: string
name: extract_symbolic_data
arguments: label: D15
type_guessed: string
name: extract_symbolic_data
arguments: label: D34
type_guessed: string

tool: D29: begin

tool: D6: bar

tool: D23: foo result: %d


tool: D15: bar result: %d


tool: D34: end

assistant: ```c
int main() {
  puts("begin");
  printf("foo result: %d\n", foo("bar"));
  printf("bar result: %d\n", bar("bar"));
  puts("end");
  return 0;
}
```
user: Demonstrate the C code that generates the assembly output below:

```asm
<main>:
  endbr64
  push   %rbx
  lea    D21(%rip),%rdi
  call   <puts@plt>
  lea    D32(%rip),%rbx
  mov    %rbx,%rdi
  call   <foo@plt>
  mov    %eax,%esi
  lea    D33(%rip),%rdi
  call   <printf@plt>
  mov    %rbx,%rdi
  call   <bar@plt>
  mov    %eax,%esi
  lea    D31(%rip),%rdi
  call   <printf@plt>
  lea    D9(%rip),%rdi
  call   <puts@plt>
  mov    $0x0,%eax
  pop    %rbx
  ret
```

tool_calls: name: unpack_data
arguments: tag: D21
datatype: string
name: unpack_data
arguments: tag: D32
datatype: string
name: unpack_data
arguments: tag: D33
datatype: string
name: unpack_data
arguments: tag: D31
datatype: string
name: unpack_data
arguments: tag: D9
datatype: string

tool: D21: begin

tool: D32: bar

tool: D33: foo result: %d


tool: D31: bar result: %d


tool: D9: end

assistant: ```c
int main() {
  puts("begin");
  printf("foo result: %d\n", foo("bar"));
  printf("bar result: %d\n", bar("bar"));
  puts("end");
  return 0;
}
```
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
  push   %rbp
  lea    D41(%rip),%rdi
  lea    D21(%rip),%rbp
  call   <puts@plt>
  mov    %rbp,%rdi
  call   <foo@plt>
  lea    D38(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    %rbp,%rdi
  call   <bar@plt>
  lea    D8(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  lea    D2(%rip),%rdi
  call   <puts@plt>
  xor    %eax,%eax
  pop    %rbp
  ret
```

tool_calls: name: parse_data
arguments: data_tag: D41
type_infered: string
name: parse_data
arguments: data_tag: D21
type_infered: string
name: parse_data
arguments: data_tag: D38
type_infered: string
name: parse_data
arguments: data_tag: D8
type_infered: string
name: parse_data
arguments: data_tag: D2
type_infered: string

tool: D41: begin

tool: D21: bar

tool: D38: foo result: %d


tool: D8: bar result: %d


tool: D2: end

assistant: ```c
int main() {
  puts("begin");
  printf("foo result: %d\n", foo("bar"));
  printf("bar result: %d\n", bar("bar"));
  puts("end");
  return 0;
}
```
user: Please show me the C implementation that matches the assembly code listed below:

```asm
<main>:
  endbr64
  push   %rbp
  lea    D49(%rip),%rdi
  lea    D10(%rip),%rbp
  call   <puts@plt>
  mov    %rbp,%rdi
  call   <foo@plt>
  lea    D44(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  mov    %rbp,%rdi
  call   <bar@plt>
  lea    D6(%rip),%rdi
  mov    %eax,%esi
  call   <printf@plt>
  lea    D45(%rip),%rdi
  call   <puts@plt>
  xor    %eax,%eax
  pop    %rbp
  ret
```

tool_calls: name: parse_data
arguments: label: D49
data_type: string
name: parse_data
arguments: label: D10
data_type: string
name: parse_data
arguments: label: D44
data_type: string
name: parse_data
arguments: label: D6
data_type: string
name: parse_data
arguments: label: D45
data_type: string

tool: D49: begin

tool: D10: bar

tool: D44: foo result: %d


tool: D6: bar result: %d


tool: D45: end

assistant: ```c
int main() {
  puts("begin");
  printf("foo result: %d\n", foo("bar"));
  printf("bar result: %d\n", bar("bar"));
  puts("end");
  return 0;
}
```
user: What would the C source look like for the assembly code provided here?

```asm
<scan_pm_gps>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  lea    D0(%rip),%rax
  mov    %rax,%rdi
  call   <exists@plt>
  test   %rax,%rax
  je     L15
  lea    D0(%rip),%rax
  jmp    L11
L15:
  mov    $0x0,%eax
L11:
  pop    %rbp
  ret
```

tool_calls: name: parse_data
arguments: label: D0
data_type: string

tool: D0: /sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0

assistant: ```c
const char *scan_pm_gps() {
  if (exists("/sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0"))
    return "/sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0";
  return NULL;
}
```
user: 请从给定的汇编指令推导出C源代码:

```asm
<scan_pm_gps>:
  endbr64
  sub    $0x8,%rsp
  lea    D3(%rip),%rdi
  call   <exists@plt>
  test   %rax,%rax
  lea    D3(%rip),%rax
  mov    $0x0,%edx
  cmove  %rdx,%rax
  add    $0x8,%rsp
  ret
```

tool_calls: name: disassemble_data
arguments: data_label: D3
type_guessed: string

tool: D3: /sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0

assistant: ```c
const char *scan_pm_gps() {
  if (exists("/sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0"))
    return "/sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0";
  return NULL;
}
```
user: Translate the below assembly code into C programming language:

```asm
<scan_pm_gps>:
  endbr64
  push   %rbx
  lea    D0(%rip),%rbx
  mov    %rbx,%rdi
  call   <exists@plt>
  test   %rax,%rax
  mov    $0x0,%eax
  cmovne %rbx,%rax
  pop    %rbx
  ret
```

tool_calls: name: disassemble_data
arguments: data_tag: D0
type_guessed: string

tool: D0: /sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0

assistant: ```c
const char *scan_pm_gps() {
  if (exists("/sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0"))
    return "/sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0";
  return NULL;
}
```
user: 这段汇编代码用C语言表示是什么样的?

```asm
<scan_pm_gps>:
  endbr64
  push   %rbx
  lea    D2(%rip),%rbx
  mov    %rbx,%rdi
  call   <exists@plt>
  test   %rax,%rax
  mov    $0x0,%eax
  cmovne %rbx,%rax
  pop    %rbx
  ret
```

tool_calls: name: retrieve_data
arguments: data_label: D2
type_infered: string

tool: D2: /sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0

assistant: ```c
const char *scan_pm_gps() {
  if (exists("/sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0"))
    return "/sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-gps.0";
  return NULL;
}
```
user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<utf8_backskip_char>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x8(%rbp)
  mov    %rsi,-0x10(%rbp)
  subq   $0x1,-0x10(%rbp)
  jmp    L10
L14:
  subq   $0x1,-0x10(%rbp)
L10:
  mov    -0x10(%rbp),%rax
  cmp    -0x8(%rbp),%rax
  jbe    L22
  mov    -0x10(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  and    $0xc0,%eax
  cmp    $0x80,%eax
  je     L14
L22:
  mov    -0x10(%rbp),%rax
  pop    %rbp
  ret
```

assistant: ```c
char *utf8_backskip_char(const char *start, const char *s) {
  for (s--; s > start && (((*s) & 0xc0) == 0x80); s--)
    ;
  return (char *)s;
}
```
user: What is the c source code of the assembly code below:

```asm
<utf8_backskip_char>:
  endbr64
  lea    -0x1(%rsi),%rax
  cmp    %rdi,%rax
  jbe    L20
L10:
  movsbl (%rax),%edx
  and    $0xc0,%edx
  cmp    $0x80,%edx
  jne    L2
  sub    $0x1,%rax
  cmp    %rax,%rdi
  jne    L10
  mov    %rdi,%rax
  ret
L20:
  ret
L2:
  ret
```

assistant: ```c
char *utf8_backskip_char(const char *start, const char *s) {
  for (s--; s > start && (((*s) & 0xc0) == 0x80); s--)
    ;
  return (char *)s;
}
```
user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<utf8_backskip_char>:
  endbr64
  lea    -0x1(%rsi),%rax
  cmp    %rdi,%rax
  ja     L2
  jmp    L26
  nop
L27:
  sub    $0x1,%rax
  cmp    %rax,%rdi
  je     L36
L2:
  movsbl (%rax),%edx
  and    $0xc0,%edx
  cmp    $0x80,%edx
  je     L27
L36:
  ret
L26:
  ret
```

assistant: ```c
char *utf8_backskip_char(const char *start, const char *s) {
  for (s--; s > start && (((*s) & 0xc0) == 0x80); s--)
    ;
  return (char *)s;
}
```
user: Demonstrate the C code that generates the assembly output below:

```asm
<utf8_backskip_char>:
  endbr64
  lea    -0x1(%rsi),%rax
  cmp    %rdi,%rax
  ja     L17
  jmp    L39
  nop
L10:
  sub    $0x1,%rax
  cmp    %rax,%rdi
  je     L18
L17:
  movsbl (%rax),%edx
  and    $0xc0,%edx
  cmp    $0x80,%edx
  je     L10
L18:
  ret
L39:
  ret
```

assistant: ```c
char *utf8_backskip_char(const char *start, const char *s) {
  for (s--; s > start && (((*s) & 0xc0) == 0x80); s--)
    ;
  return (char *)s;
}
```
user: What would the C source look like for the assembly code provided here?

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x50,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0x38(%rbp)
  lea    -0x40(%rbp),%rdx
  lea    -0x44(%rbp),%rax
  mov    %rax,%rsi
  lea    D3(%rip),%rax
  mov    %rax,%rdi
  call   <scanf@plt>
  mov    -0x40(%rbp),%eax
  mov    %eax,-0x34(%rbp)
  movl   $0x0,-0x38(%rbp)
  jmp    L44
L47:
  mov    -0x34(%rbp),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  mov    %eax,-0x34(%rbp)
  addl   $0x1,-0x38(%rbp)
L44:
  cmpl   $0x0,-0x34(%rbp)
  jg     L47
  mov    -0x38(%rbp),%eax
  mov    %eax,-0x3c(%rbp)
  jmp    L46
L3:
  mov    -0x40(%rbp),%eax
  mov    -0x3c(%rbp),%edx
  sub    $0x1,%edx
  mov    %eax,%ecx
  sar    $0x1f,%ecx
  shr    $0x1f,%ecx
  add    %ecx,%eax
  and    $0x1,%eax
  sub    %ecx,%eax
  mov    %eax,%ecx
  movslq %edx,%rax
  mov    %ecx,-0x30(%rbp,%rax,4)
  mov    -0x40(%rbp),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  mov    %eax,-0x40(%rbp)
  subl   $0x1,-0x3c(%rbp)
L46:
  cmpl   $0x0,-0x3c(%rbp)
  jg     L3
  mov    -0x44(%rbp),%edx
  mov    -0x38(%rbp),%eax
  sub    %edx,%eax
  sub    $0x1,%eax
  mov    %eax,-0x3c(%rbp)
  mov    -0x3c(%rbp),%eax
  cltq
  mov    -0x30(%rbp,%rax,4),%eax
  mov    %eax,%esi
  lea    D0(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x0,%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L45
  call   <__stack_chk_fail@plt>
L45:
  leave
  ret
```

tool_calls: name: parse_data
arguments: data_tag: D3
datatype: string
name: parse_data
arguments: data_tag: D0
datatype: string

tool: D3: %d %d

tool: D0: %d

assistant: ```c
int main() {
  int a, b, i, j = 0, c, m[7];
  scanf("%d %d", &a, &b);
  c = b;
  for (j = 0; c > 0; j++)
    c = c / 2;
  for (i = j; i > 0; i--) {
    m[i - 1] = b % 2;
    b = b / 2;
  }
  i = j - a - 1;
  printf("%d", m[i]);
  return 0;
}
```
user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<main>:
  endbr64
  sub    $0x48,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x38(%rsp)
  xor    %eax,%eax
  lea    0xc(%rsp),%rdx
  lea    0x8(%rsp),%rsi
  lea    D15(%rip),%rdi
  call   <scanf@plt>
  mov    0xc(%rsp),%eax
  test   %eax,%eax
  jle    L27
  mov    %eax,%edx
  mov    $0x0,%esi
L34:
  mov    %edx,%ecx
  mov    %edx,%edi
  shr    $0x1f,%edi
  add    %edi,%edx
  sar    %edx
  add    $0x1,%esi
  cmp    $0x1,%ecx
  jg     L34
  test   %esi,%esi
  jle    L4
  movslq %esi,%rcx
L32:
  mov    %eax,%edi
  shr    $0x1f,%edi
  lea    (%rax,%rdi,1),%edx
  and    $0x1,%edx
  sub    %edi,%edx
  mov    %edx,0xc(%rsp,%rcx,4)
  add    %edi,%eax
  sar    %eax
  sub    $0x1,%rcx
  test   %ecx,%ecx
  jg     L32
  mov    %eax,0xc(%rsp)
L4:
  sub    0x8(%rsp),%esi
  sub    $0x1,%esi
  movslq %esi,%rsi
  mov    0x10(%rsp,%rsi,4),%esi
  lea    D13(%rip),%rdi
  call   <printf@plt>
  mov    0x38(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L1
  mov    $0x0,%eax
  add    $0x48,%rsp
  ret
L27:
  mov    $0x0,%esi
  jmp    L4
L1:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: label: D15
data_type: string
name: disassemble_data
arguments: label: D13
data_type: string

tool: D15: %d %d

tool: D13: %d

assistant: ```c
int main() {
  int a, b, i, j = 0, c, m[7];
  scanf("%d %d", &a, &b);
  c = b;
  for (j = 0; c > 0; j++)
    c = c / 2;
  for (i = j; i > 0; i--) {
    m[i - 1] = b % 2;
    b = b / 2;
  }
  i = j - a - 1;
  printf("%d", m[i]);
  return 0;
}
```
user: 请从给定的汇编指令推导出C源代码:

```asm
<main>:
  endbr64
  sub    $0x48,%rsp
  lea    D14(%rip),%rdi
  mov    %fs:0x28,%rax
  mov    %rax,0x38(%rsp)
  xor    %eax,%eax
  lea    0xc(%rsp),%rdx
  lea    0x8(%rsp),%rsi
  call   <scanf@plt>
  mov    0xc(%rsp),%ecx
  test   %ecx,%ecx
  jle    L45
  mov    %ecx,%eax
  xor    %edx,%edx
  nopw   0x0(%rax,%rax,1)
L46:
  add    $0x1,%edx
  sar    %eax
  jne    L46
  movslq %edx,%rax
  lea    0x10(%rsp),%rdi
  nop
L41:
  mov    %ecx,%esi
  sar    %ecx
  and    $0x1,%esi
  mov    %esi,-0x4(%rdi,%rax,4)
  sub    $0x1,%rax
  test   %eax,%eax
  jne    L41
  mov    %ecx,0xc(%rsp)
L18:
  sub    0x8(%rsp),%edx
  lea    D12(%rip),%rdi
  sub    $0x1,%edx
  movslq %edx,%rdx
  mov    0x10(%rsp,%rdx,4),%esi
  call   <printf@plt>
  mov    0x38(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L3
  xor    %eax,%eax
  add    $0x48,%rsp
  ret
L45:
  xor    %edx,%edx
  jmp    L18
L3:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: tag: D14
type_guessed: string
name: extract_symbolic_data
arguments: tag: D12
type_guessed: string

tool: D14: %d %d

tool: D12: %d

assistant: ```c
int main() {
  int a, b, i, j = 0, c, m[7];
  scanf("%d %d", &a, &b);
  c = b;
  for (j = 0; c > 0; j++)
    c = c / 2;
  for (i = j; i > 0; i--) {
    m[i - 1] = b % 2;
    b = b / 2;
  }
  i = j - a - 1;
  printf("%d", m[i]);
  return 0;
}
```