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

```asm
<main>:
  endbr64
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  mov    %edi,%ebx
  mov    %rsi,%rbp
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  call   <init@plt>
  cmp    $0x1,%ebx
  jle    L75
  mov    $0x0,%r13d
  lea    D49(%rip),%r12
  cmp    $0x3,%ebx
  je     L53
L125:
  mov    0x8(%rbp),%rbp
  lea    D26(%rip),%rsi
  mov    %rbp,%rdi
  call   <strcmp@plt>
  mov    %eax,%ebx
  test   %eax,%eax
  je     L6
  lea    D35(%rip),%rsi
  mov    %rbp,%rdi
  call   <strcmp@plt>
  mov    %eax,%ebx
  test   %eax,%eax
  je     L71
  lea    D47(%rip),%rsi
  mov    %rbp,%rdi
  call   <strcmp@plt>
  test   %eax,%eax
  je     L67
  lea    D41(%rip),%rsi
  mov    %rbp,%rdi
  call   <strcmp@plt>
  test   %eax,%eax
  je     L16
  lea    D58(%rip),%rsi
  mov    %rbp,%rdi
  call   <strcmp@plt>
  test   %eax,%eax
  jne    L93
  call   <erase@plt>
  mov    %eax,%ebx
  jmp    L14
L53:
  mov    0x10(%rbp),%r12
  mov    %r12,%r13
  jmp    L125
L6:
  mov    $0x0,%eax
  call   <read_datafs_from_flash@plt>
  mov    %rax,%rbp
  mov    $0x4000,%edx
  mov    %rax,%rsi
  mov    %r12,%rdi
  call   <write_file@plt>
  mov    %rbp,%rdi
  call   <free@plt>
  jmp    L14
L71:
  movl   $0x0,0x4(%rsp)
  lea    0x4(%rsp),%rsi
  mov    %r12,%rdi
  call   <read_file@plt>
  mov    %rax,%rbp
  mov    %rax,%rdi
  call   <write_flash@plt>
  mov    %rbp,%rdi
  call   <free@plt>
  jmp    L14
L67:
  call   <save@plt>
  mov    %eax,%ebx
  jmp    L14
L16:
  mov    %r13,%rdi
  call   <load@plt>
  mov    %eax,%ebx
  jmp    L14
L93:
  mov    $0x0,%eax
  call   <usage@plt>
  mov    $0x0,%ebx
  jmp    L14
L75:
  mov    $0x0,%eax
  call   <usage@plt>
  mov    $0x0,%ebx
L14:
  mov    0x8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L97
  mov    %ebx,%eax
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L97:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: tag: D49
data_type: string
name: disassemble_data
arguments: tag: D26
data_type: string
name: disassemble_data
arguments: tag: D35
data_type: string
name: disassemble_data
arguments: tag: D47
data_type: string
name: disassemble_data
arguments: tag: D41
data_type: string
name: disassemble_data
arguments: tag: D58
data_type: string

tool: D49: -

tool: D26: read_datafs

tool: D35: write_datafs

tool: D47: save

tool: D41: load

tool: D58: erase

assistant: ```c
int main(int argc, char **argv) {
  char *filename = "-";
  char *optarg = NULL;
  char *optarg1 = NULL;
  char *optarg2 = NULL;
  char *optarg3 = NULL;
  int result = 0;
  if (0)
    _dbg("starting(): argc=%d\n", argc);
  init();
  if (0)
    _dbg("argc:%d, argv[0]=%s, argv[1]=%s, argv[2]=%s\n", argc, argv[0], argv[1], argv[2]);
  if (argc >= 2) {
    if (argc == 3)
      filename = optarg = argv[2];
    if (argc == 5) {
      optarg1 = argv[2];
      optarg2 = argv[3];
      optarg3 = argv[4];
    }
    if (0)
      _dbg("filename=%s\n", filename);
    if (!strcmp(argv[1], "read_datafs")) {
      char *buf = read_datafs_from_flash();
      write_file(filename, buf, (1024 * 16));
      free(buf);
    } else if (!strcmp(argv[1], "write_datafs")) {
      int size = 0;
      char *buf = read_file(filename, &size);
      write_flash(buf);
      free(buf);
    } else if (!strcmp(argv[1], "save")) {
      result = save();
    } else if (!strcmp(argv[1], "load")) {
      result = load(optarg);
    } else if (!strcmp(argv[1], "erase")) {
      result = erase();
    } else
      usage();
  } else
    usage();
  return result;
}
```