user: What would the C source look like for the assembly code provided here:

```asm
<main>:
  endbr64
  push   %r12
  lea    D48(%rip),%rdi
  lea    D116(%rip),%r12
  push   %rbp
  lea    D114(%rip),%rbp
  sub    $0x18,%rsp
  call   <puts@plt>
  lea    D27(%rip),%rdi
  call   <puts@plt>
  xor    %eax,%eax
  call   <show_env@plt>
  lea    D126(%rip),%rdi
  call   <puts@plt>
  mov    $0x1,%edx
  mov    %r12,%rsi
  mov    %rbp,%rdi
  call   <setenv@plt>
  xor    %eax,%eax
  call   <show_env@plt>
  lea    D39(%rip),%rdi
  call   <puts@plt>
  mov    $0x1,%edx
  lea    D11(%rip),%rsi
  mov    %rbp,%rdi
  call   <setenv@plt>
  xor    %eax,%eax
  call   <show_env@plt>
  lea    D24(%rip),%rdi
  call   <puts@plt>
  xor    %edx,%edx
  mov    %r12,%rsi
  mov    %rbp,%rdi
  call   <setenv@plt>
  xor    %eax,%eax
  call   <show_env@plt>
  lea    D147(%rip),%rdi
  call   <puts@plt>
  xor    %edx,%edx
  mov    %r12,%rsi
  mov    %rbp,%rdi
  call   <setenv@plt>
  xor    %eax,%eax
  call   <show_env@plt>
  lea    D118(%rip),%rdi
  call   <puts@plt>
  lea    D105(%rip),%rdi
  call   <getenv@plt>
  test   %rax,%rax
  je     L27
  xor    %eax,%eax
  call   <oops@plt>
L27:
  lea    D142(%rip),%rdi
  call   <puts@plt>
  mov    %rbp,%rdi
  call   <getenv@plt>
  mov    %rax,%rsi
  test   %rax,%rax
  je     L11
L1:
  lea    D80(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    D89(%rip),%rdi
  call   <puts@plt>
  lea    D122(%rip),%rdi
  call   <putenv@plt>
  xor    %eax,%eax
  call   <show_env@plt>
  lea    D103(%rip),%rdi
  call   <puts@plt>
  lea    D7(%rip),%rdi
  call   <putenv@plt>
  xor    %eax,%eax
  call   <show_env@plt>
  xor    %edi,%edi
  call   <exit@plt>
  add    $0x18,%rsp
  xor    %eax,%eax
  pop    %rbp
  pop    %r12
  ret
L11:
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  call   <oops@plt>
  mov    0x8(%rsp),%rsi
  jmp    L1
```

tool_calls: name: retrieve_data
arguments: data_label: D48
data_type: string
name: retrieve_data
arguments: data_label: D116
data_type: string
name: retrieve_data
arguments: data_label: D114
data_type: string
name: retrieve_data
arguments: data_label: D27
data_type: string
name: retrieve_data
arguments: data_label: D126
data_type: string
name: retrieve_data
arguments: data_label: D39
data_type: string
name: retrieve_data
arguments: data_label: D11
data_type: string
name: retrieve_data
arguments: data_label: D24
data_type: string
name: retrieve_data
arguments: data_label: D147
data_type: string
name: retrieve_data
arguments: data_label: D118
data_type: string
name: retrieve_data
arguments: data_label: D105
data_type: string
name: retrieve_data
arguments: data_label: D142
data_type: string
name: retrieve_data
arguments: data_label: D80
data_type: string
name: retrieve_data
arguments: data_label: D89
data_type: string
name: retrieve_data
arguments: data_label: D122
data_type: string
name: retrieve_data
arguments: data_label: D103
data_type: string
name: retrieve_data
arguments: data_label: D7
data_type: string

tool: D48: test environment variables

tool: D116: /boot

tool: D114: PATH

tool: D27: show env

tool: D126: setenv-1

tool: D39: setenv-2

tool: D11: /boot:/bin

tool: D24: setenv-3

tool: D147: setenv-4

tool: D118: getenv-1

tool: D105: TMP

tool: D142: getenv-2

tool: D80: PATH=%s


tool: D89: putenv-1

tool: D122: TMP=/tmp

tool: D103: putenv-2

tool: D7: ABC=/abc

assistant: ```c
int main(int argc, char *argv[]) {
  char *val;
  printf("test environment variables\n");
  printf("show env\n");
  show_env();
  printf("setenv-1\n");
  setenv("PATH", "/boot", 1);
  show_env();
  printf("setenv-2\n");
  setenv("PATH", "/boot:/bin", 1);
  show_env();
  printf("setenv-3\n");
  setenv("PATH", "/boot", 0);
  show_env();
  printf("setenv-4\n");
  setenv("PATH", "/boot", 0);
  show_env();
  printf("getenv-1\n");
  val = getenv("TMP");
  if (val != NULL)
    oops();
  printf("getenv-2\n");
  val = getenv("PATH");
  if (val == NULL)
    oops();
  printf("PATH=%s\n", val);
  printf("putenv-1\n");
  putenv("TMP=/tmp");
  show_env();
  printf("putenv-2\n");
  putenv("ABC=/abc");
  show_env();
  exit(0);
}
```