user: Demonstrate the C code that generates the assembly output below:

```asm
<mangle_filename>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x50,%rsp
  mov    %rdi,-0x48(%rbp)
  movl   $0x0,-0x3c(%rbp)
  lea    D10(%rip),%rax
  mov    %rax,%rdi
  call   <getenv@plt>
  mov    %rax,-0x20(%rbp)
  lea    D8(%rip),%rax
  mov    %rax,%rdi
  call   <getenv@plt>
  mov    %rax,-0x18(%rbp)
  cmpq   $0x0,-0x20(%rbp)
  je     L111
  mov    -0x20(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L86
L111:
  mov    -0x48(%rbp),%rax
  mov    %rax,%rdi
  call   <strdup@plt>
  jmp    L47
L86:
  cmpq   $0x0,-0x18(%rbp)
  je     L46
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <atoi@plt>
  mov    %eax,-0x40(%rbp)
  cmpl   $0x0,-0x40(%rbp)
  jns    L25
  movl   $0x0,-0x40(%rbp)
  jmp    L25
L46:
  movl   $0x0,-0x40(%rbp)
L25:
  mov    -0x48(%rbp),%rax
  mov    %rax,-0x30(%rbp)
  movl   $0x0,-0x3c(%rbp)
  mov    -0x30(%rbp),%rax
  add    $0x1,%rax
  mov    %rax,-0x28(%rbp)
  jmp    L118
L6:
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  je     L22
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x2f,%al
  jne    L127
  mov    -0x28(%rbp),%rax
  mov    %rax,-0x30(%rbp)
  addl   $0x1,-0x3c(%rbp)
  jmp    L96
L127:
  nop
L96:
  addq   $0x1,-0x28(%rbp)
L118:
  mov    -0x3c(%rbp),%eax
  cmp    -0x40(%rbp),%eax
  jl     L6
  jmp    L30
L22:
  nop
L30:
  mov    -0x30(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %rax,-0x38(%rbp)
  mov    -0x38(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  add    $0x2,%rax
  mov    %rax,%rdi
  call   <malloc@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x38(%rbp),%rdx
  mov    -0x20(%rbp),%rcx
  mov    -0x8(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0x38(%rbp),%rax
  lea    -0x1(%rax),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x2f,%al
  je     L124
  mov    -0x38(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x38(%rbp)
  mov    -0x8(%rbp),%rdx
  add    %rdx,%rax
  movb   $0x2f,(%rax)
L124:
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    -0x8(%rbp),%rcx
  mov    -0x38(%rbp),%rax
  add    %rax,%rcx
  mov    -0x30(%rbp),%rax
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <memcpy@plt>
  mov    -0x8(%rbp),%rax
L47:
  leave
  ret
```

tool_calls: name: extract_symbolic_data
arguments: label: D10
type: string
name: extract_symbolic_data
arguments: label: D8
type: string

tool: D10: GCOV_PREFIX

tool: D8: GCOV_PREFIX_STRIP

assistant: ```c
char *mangle_filename(const char *orig_filename) {
  char *new_filename;
  size_t filename_len, prefix_len;
  int prefix_strip;
  int level = 0;
  const char *fname, *ptr;
  const char *prefix = getenv("GCOV_PREFIX");
  const char *prefix_strip_str = getenv("GCOV_PREFIX_STRIP");
  if (prefix == NULL || prefix[0] == '\0')
    return strdup(orig_filename);
  if (prefix_strip_str) {
    prefix_strip = atoi(prefix_strip_str);
    if (prefix_strip < 0)
      prefix_strip = 0;
  } else {
    prefix_strip = 0;
  }
  fname = orig_filename;
  for (level = 0, ptr = fname + 1; level < prefix_strip; ++ptr) {
    if (*ptr == '\0')
      break;
    if (*ptr != '/')
      continue;
    fname = ptr;
    ++level;
  }
  filename_len = strlen(fname);
  prefix_len = strlen(prefix);
  new_filename = malloc(prefix_len + 1 + filename_len + 1);
  memcpy(new_filename, prefix, prefix_len);
  if (prefix[prefix_len - 1] != '/')
    new_filename[prefix_len++] = '/';
  memcpy(new_filename + prefix_len, fname, filename_len + 1);
  return new_filename;
}
```