user: What is the c source code of the assembly code below?

```asm
<fmerge>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x60,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %rsi,-0x50(%rbp)
  mov    %rdx,-0x58(%rbp)
  mov    %ecx,-0x5c(%rbp)
  mov    %r8d,-0x60(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  mov    -0x60(%rbp),%eax
  sub    -0x5c(%rbp),%eax
  mov    %eax,-0x24(%rbp)
  movq   $0x0,-0x20(%rbp)
  movq   $0x0,-0x18(%rbp)
  movq   $0x0,-0x10(%rbp)
  movl   $0x0,-0x34(%rbp)
  movl   $0x0,-0x2c(%rbp)
  movl   $0x0,-0x30(%rbp)
  movl   $0x0,-0x28(%rbp)
  cmpl   $0x0,-0x24(%rbp)
  jle    L126
  cmpl   $0x1,-0x24(%rbp)
  jne    L84
  mov    -0x48(%rbp),%rax
  mov    %rax,%rdx
  lea    D0(%rip),%rax
  mov    %rax,%rsi
  mov    $0x0,%edi
  call   <freopen@plt>
  mov    %rax,-0x48(%rbp)
  mov    -0x5c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    -0x48(%rbp),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <copy_content@plt>
  mov    -0x5c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
  jmp    L32
L84:
  mov    -0x5c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x5c(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    %rax,-0x18(%rbp)
  mov    $0x0,%eax
  call   <tmpfile@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x20(%rbp),%rdx
  lea    -0x34(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x4,%esi
  mov    %rax,%rdi
  call   <fread@plt>
  mov    %eax,-0x2c(%rbp)
  mov    -0x18(%rbp),%rdx
  lea    -0x30(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x4,%esi
  mov    %rax,%rdi
  call   <fread@plt>
  mov    %eax,-0x28(%rbp)
L69:
  cmpl   $0x0,-0x2c(%rbp)
  je     L104
  cmpl   $0x0,-0x28(%rbp)
  jne    L104
  mov    -0x10(%rbp),%rdx
  lea    -0x34(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x4,%esi
  mov    %rax,%rdi
  call   <fwrite@plt>
  mov    -0x20(%rbp),%rdx
  lea    -0x34(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x4,%esi
  mov    %rax,%rdi
  call   <fread@plt>
  mov    %eax,-0x2c(%rbp)
  jmp    L22
L104:
  cmpl   $0x0,-0x28(%rbp)
  je     L118
  cmpl   $0x0,-0x2c(%rbp)
  jne    L118
  mov    -0x10(%rbp),%rdx
  lea    -0x30(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x4,%esi
  mov    %rax,%rdi
  call   <fwrite@plt>
  mov    -0x18(%rbp),%rdx
  lea    -0x30(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x4,%esi
  mov    %rax,%rdi
  call   <fread@plt>
  mov    %eax,-0x28(%rbp)
  jmp    L22
L118:
  cmpl   $0x0,-0x2c(%rbp)
  je     L71
  cmpl   $0x0,-0x28(%rbp)
  je     L71
  mov    -0x34(%rbp),%edx
  mov    -0x30(%rbp),%eax
  cmp    %eax,%edx
  jge    L159
  mov    -0x10(%rbp),%rdx
  lea    -0x34(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x4,%esi
  mov    %rax,%rdi
  call   <fwrite@plt>
  mov    -0x20(%rbp),%rdx
  lea    -0x34(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x4,%esi
  mov    %rax,%rdi
  call   <fread@plt>
  mov    %eax,-0x2c(%rbp)
  jmp    L69
L159:
  mov    -0x10(%rbp),%rdx
  lea    -0x30(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x4,%esi
  mov    %rax,%rdi
  call   <fwrite@plt>
  mov    -0x18(%rbp),%rdx
  lea    -0x30(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x4,%esi
  mov    %rax,%rdi
  call   <fread@plt>
  mov    %eax,-0x28(%rbp)
L22:
  jmp    L69
L71:
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
  mov    $0x0,%eax
  call   <tmpfile@plt>
  mov    %rax,-0x18(%rbp)
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <rewind@plt>
  mov    -0x18(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <copy_content@plt>
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <rewind@plt>
  mov    -0x5c(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rax,%rdx
  mov    -0x18(%rbp),%rax
  mov    %rax,(%rdx)
  mov    -0x5c(%rbp),%eax
  lea    0x1(%rax),%ecx
  mov    -0x60(%rbp),%edi
  mov    -0x58(%rbp),%rdx
  mov    -0x50(%rbp),%rsi
  mov    -0x48(%rbp),%rax
  mov    %edi,%r8d
  mov    %rax,%rdi
  call   <fmerge>
  jmp    L32
L126:
  nop
L32:
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L68
  call   <__stack_chk_fail@plt>
L68:
  leave
  ret
```

tool_calls: name: extract_symbolic_data
arguments: data_label: D0
type_infered: string

tool: D0: wb

assistant: ```c
void fmerge(FILE *f, FILE **file_list, size_t buffer_size, int begin, int end) {
  int len = end - begin;
  FILE *f1 = 0;
  FILE *f2 = 0;
  FILE *f3 = 0;
  int a = 0;
  int read_a = 0;
  int b = 0;
  int read_b = 0;
  if (len < 1) {
    return;
  }
  if (len == 1) {
    f = freopen(0, "wb", f);
    copy_content(file_list[begin], f);
    fclose(file_list[begin]);
    return;
  }
  f1 = file_list[begin];
  f2 = file_list[begin + 1];
  f3 = tmpfile();
  read_a = (int)fread(&a, sizeof(a), 1, f1);
  read_b = (int)fread(&b, sizeof(b), 1, f2);
  while (1) {
    if (read_a && !read_b) {
      fwrite(&a, sizeof(a), 1, f3);
      read_a = (int)fread(&a, sizeof(a), 1, f1);
    } else if (read_b && !read_a) {
      fwrite(&b, sizeof(b), 1, f3);
      read_b = (int)fread(&b, sizeof(b), 1, f2);
    } else if (read_a && read_b) {
      if (a < b) {
        fwrite(&a, sizeof(a), 1, f3);
        read_a = (int)fread(&a, sizeof(a), 1, f1);
      } else {
        fwrite(&b, sizeof(b), 1, f3);
        read_b = (int)fread(&b, sizeof(b), 1, f2);
      }
    } else {
      break;
    }
  }
  fclose(f1);
  fclose(f2);
  f2 = tmpfile();
  rewind(f3);
  copy_content(f3, f2);
  fclose(f3);
  rewind(f2);
  file_list[begin + 1] = f2;
  fmerge(f, file_list, buffer_size, begin + 1, end);
}
```