user: 请从给定的汇编指令推导出C源代码：

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  add    $0xffffffffffffff80,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  lea    D41(%rip),%rax
  mov    %rax,%rsi
  lea    D109(%rip),%rax
  mov    %rax,%rdi
  call   <fopen@plt>
  mov    %rax,-0x68(%rbp)
  cmpq   $0x0,-0x68(%rbp)
  jne    L7
  lea    D3(%rip),%rax
  mov    %rax,%rdi
  call   <nrerror@plt>
L7:
  mov    -0x68(%rbp),%rdx
  lea    -0x60(%rbp),%rax
  mov    $0x50,%esi
  mov    %rax,%rdi
  call   <fgets@plt>
  jmp    L30
L68:
  mov    -0x68(%rbp),%rdx
  lea    -0x60(%rbp),%rax
  mov    $0x50,%esi
  mov    %rax,%rdi
  call   <fgets@plt>
  mov    -0x68(%rbp),%rax
  mov    %rax,%rdi
  call   <feof@plt>
  test   %rax,%rax
  je     L30
  lea    D84(%rip),%rax
  mov    %rax,%rdi
  call   <nrerror@plt>
L30:
  lea    -0x60(%rbp),%rax
  mov    $0xe,%edx
  lea    D43(%rip),%rcx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strncmp@plt>
  test   %rax,%rax
  jne    L68
  lea    -0x78(%rbp),%rdx
  mov    -0x68(%rbp),%rax
  lea    D14(%rip),%rcx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <fscanf@plt>
  lea    D85(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D133(%rip),%rax
  mov    %rax,%rcx
  lea    D74(%rip),%rax
  mov    %rax,%rdx
  lea    D57(%rip),%rax
  mov    %rax,%rsi
  lea    D12(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x1,-0x6c(%rbp)
  jmp    L49
L52:
  lea    -0x70(%rbp),%rcx
  lea    -0x74(%rbp),%rdx
  mov    -0x68(%rbp),%rax
  lea    D18(%rip),%rsi
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <fscanf@plt>
  movss  -0x70(%rbp),%xmm1
  movss  D138(%rip),%xmm0
  subss  %xmm1,%xmm0
  movss  %xmm0,-0x70(%rbp)
  mov    -0x74(%rbp),%eax
  movd   %eax,%xmm0
  call   <erfcc@plt>
  movq   %xmm0,%rdx
  movss  -0x70(%rbp),%xmm0
  cvtss2sd %xmm0,%xmm0
  movss  -0x74(%rbp),%xmm1
  pxor   %xmm3,%xmm3
  cvtss2sd %xmm1,%xmm3
  movq   %xmm3,%rax
  movq   %rdx,%xmm2
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  lea    D35(%rip),%rax
  mov    %rax,%rdi
  mov    $0x3,%eax
  call   <printf@plt>
  addl   $0x1,-0x6c(%rbp)
L49:
  mov    -0x78(%rbp),%eax
  cmp    %eax,-0x6c(%rbp)
  jle    L52
  mov    -0x68(%rbp),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
  mov    $0x0,%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L50
  call   <__stack_chk_fail@plt>
L50:
  leave
  ret
```

tool_calls: name: retrieve_data
arguments: data_label: D41
type: string
name: retrieve_data
arguments: data_label: D109
type: string
name: retrieve_data
arguments: data_label: D3
type: string
name: retrieve_data
arguments: data_label: D84
type: string
name: retrieve_data
arguments: data_label: D43
type: string
name: retrieve_data
arguments: data_label: D14
type: string
name: retrieve_data
arguments: data_label: D85
type: string
name: retrieve_data
arguments: data_label: D133
type: string
name: retrieve_data
arguments: data_label: D74
type: string
name: retrieve_data
arguments: data_label: D57
type: string
name: retrieve_data
arguments: data_label: D12
type: string
name: retrieve_data
arguments: data_label: D18
type: string
name: retrieve_data
arguments: data_label: D138
type: f32
name: retrieve_data
arguments: data_label: D35
type: string

tool: D41: r

tool: D109: fncval.dat

tool: D3: Data file fncval.dat not found


tool: D84: Data not found in fncval.dat


tool: D43: Error Function

tool: D14: %d %*s

tool: D85: 
complementary error function

tool: D133: erfcc(x)

tool: D74: actual

tool: D57: x

tool: D12: %5s %12s %13s


tool: D18: %f %f

tool: D138: 1

tool: D35: %6.2f %12.7f %12.7f


assistant: ```c
int main(void) {
  char txt[80];
  int i, nval;
  float x, val;
  FILE *fp;
  if ((fp = fopen("fncval.dat", "r")) == NULL)
    nrerror("Data file fncval.dat not found\n");
  fgets(txt, 80, fp);
  while (strncmp(txt, "Error Function", 14)) {
    fgets(txt, 80, fp);
    if (feof(fp))
      nrerror("Data not found in fncval.dat\n");
  }
  fscanf(fp, "%d %*s", &nval);
  printf("\ncomplementary error function\n");
  printf("%5s %12s %13s\n", "x", "actual", "erfcc(x)");
  for (i = 1; i <= nval; i++) {
    fscanf(fp, "%f %f", &x, &val);
    val = 1.0 - val;
    printf("%6.2f %12.7f %12.7f\n", x, val, erfcc(x));
  }
  fclose(fp);
  return 0;
}
```