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

```asm
<builtin_export>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %edi,-0x34(%rbp)
  mov    %esi,-0x38(%rbp)
  mov    %rdx,-0x40(%rbp)
  mov    %ecx,-0x44(%rbp)
  cmpl   $0x1,-0x38(%rbp)
  jg     L57
  mov    -0x34(%rbp),%eax
  lea    D14(%rip),%rdx
  mov    %eax,%esi
  mov    $0x0,%edi
  mov    $0x0,%eax
  call   <ftsh_error@plt>
  mov    $0x0,%eax
  jmp    L22
L57:
  cmpl   $0x2,-0x38(%rbp)
  jle    L49
  mov    -0x34(%rbp),%eax
  lea    D40(%rip),%rdx
  mov    %eax,%esi
  mov    $0x0,%edi
  mov    $0x0,%eax
  call   <ftsh_error@plt>
  mov    $0x0,%eax
  jmp    L22
L49:
  mov    -0x40(%rbp),%rax
  mov    0x8(%rax),%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <buffer_load@plt>
  mov    %rax,-0x28(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  jne    L56
  lea    D5(%rip),%rax
  mov    %rax,%rdi
  call   <xxstrdup@plt>
  mov    %rax,-0x28(%rbp)
L56:
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %rax,%rbx
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  add    %rbx,%rax
  add    $0x3,%rax
  mov    %rax,%rdi
  call   <malloc@plt>
  mov    %rax,-0x18(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  jne    L25
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0x0,%eax
  jmp    L22
L25:
  mov    -0x28(%rbp),%rcx
  mov    -0x20(%rbp),%rdx
  mov    -0x34(%rbp),%eax
  mov    %rcx,%r8
  mov    %rdx,%rcx
  lea    D29(%rip),%rdx
  mov    %eax,%esi
  mov    $0x14,%edi
  mov    $0x0,%eax
  call   <ftsh_error@plt>
  mov    -0x28(%rbp),%rcx
  mov    -0x20(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  lea    D42(%rip),%rsi
  mov    %rax,%rdi
  call   <sprintf@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <putenv@plt>
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0x1,%eax
L22:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

tool_calls: name: retrieve_data
arguments: label: D14
datatype: string
name: retrieve_data
arguments: label: D40
datatype: string
name: retrieve_data
arguments: label: D5
datatype: string
name: retrieve_data
arguments: label: D29
datatype: string
name: retrieve_data
arguments: label: D42
datatype: string

tool: D14: export: exactly one argument needed

tool: D40: export: too many arguments

tool: 

tool: D29: EXPORT %s (%s)

tool: D42: %s=%s

assistant: ```c
int builtin_export(int line, int argc, char **argv, time_t stoptime) {
  char *expr;
  char *name;
  char *value;
  if (argc < 2) {
    ftsh_error(0, line, "export: exactly one argument needed");
    return 0;
  } else if (argc > 2) {
    ftsh_error(0, line, "export: too many arguments");
    return 0;
  }
  name = argv[1];
  value = buffer_load(name);
  if (!value)
    value = xxstrdup("");
  expr = malloc(strlen(name) + strlen(value) + 3);
  if (!expr) {
    free(name);
    free(value);
    return 0;
  }
  ftsh_error(20, line, "EXPORT %s (%s)", name, value);
  sprintf(expr, "%s=%s", name, value);
  putenv(expr);
  free(name);
  free(value);
  return 1;
}
```