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

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x18,%rsp
  mov    %rsi,%r12
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  cmp    $0x2,%edi
  jne    L124
L109:
  mov    0x8(%r12),%rdi
  lea    D62(%rip),%rsi
  call   <fopen@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  je     L126
L137:
  mov    0x8(%r12),%rdi
  mov    $0x2f,%esi
  call   <strrchr@plt>
  lea    0x1(%rax),%r13
  test   %rax,%rax
  je     L81
L78:
  mov    %r13,%rdi
  call   <strlen@plt>
  add    $0x5,%eax
  cltq
  lea    0xf(%rax),%rdx
  mov    %rdx,%rsi
  and    $0xfffffffffffffff0,%rsi
  and    $0xfffffffffffff000,%rdx
  mov    %rsp,%rcx
  sub    %rdx,%rcx
L72:
  cmp    %rcx,%rsp
  je     L101
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L72
L124:
  mov    (%rsi),%rdi
  call   <usage@plt>
  jmp    L109
L126:
  lea    D1(%rip),%rdi
  call   <puts@plt>
  mov    $0x1,%edi
  call   <exit@plt>
  jmp    L137
L81:
  mov    0x8(%r12),%r13
  jmp    L78
L101:
  mov    %rsi,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  test   %rdx,%rdx
  je     L39
  orq    $0x0,-0x8(%rsp,%rdx,1)
L39:
  mov    %rsp,%r14
  add    $0xf,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffffff0,%rcx
  and    $0xfffffffffffff000,%rax
  mov    %rsp,%rdx
  sub    %rax,%rdx
L115:
  cmp    %rdx,%rsp
  je     L122
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L115
L122:
  mov    %rcx,%rax
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  je     L24
  orq    $0x0,-0x8(%rsp,%rax,1)
L24:
  mov    %r13,%rsi
  mov    %r14,%rdi
  call   <strcpy@plt>
  mov    %r13,%rsi
  mov    %rsp,%rdi
  call   <strcpy@plt>
  lea    D53(%rip),%rsi
  mov    %r14,%rdi
  call   <strcat@plt>
  lea    D31(%rip),%rsi
  mov    %rsp,%rdi
  call   <strcat@plt>
  lea    D58(%rip),%r13
  mov    %r13,%rsi
  mov    %r14,%rdi
  call   <fopen@plt>
  mov    %rax,%r14
  mov    %r13,%rsi
  mov    %rsp,%rdi
  call   <fopen@plt>
  mov    %rax,%r13
  mov    $0xffffffff,%esi
  mov    %rbx,%rdi
  call   <FseekEnd@plt>
  mov    %rbx,%rdi
  call   <ftell@plt>
  lea    0x1(%rax),%r15d
  movslq %r15d,%rdx
  mov    0x8(%r12),%rsi
  lea    D23(%rip),%rdi
  call   <printf@plt>
  test   %r15b,%r15b
  je     L8
  lea    D42(%rip),%rdi
  call   <puts@plt>
  mov    $0x1,%edi
  call   <exit@plt>
L8:
  mov    $0xffffff00,%esi
  mov    %rbx,%rdi
  call   <FseekEnd@plt>
  lea    -0x40(%rbp),%rdi
  mov    %rbx,%rcx
  mov    $0x1,%edx
  mov    $0x8,%esi
  call   <fread@plt>
  movzbl -0x40(%rbp),%eax
  movzbl -0x3e(%rbp),%edx
  add    %edx,%eax
  cmp    $0xff,%eax
  sete   %dil
  movzbl %dil,%edi
  call   <assert@plt>
  movzbl -0x3f(%rbp),%eax
  movzbl -0x3d(%rbp),%edx
  add    %edx,%eax
  cmp    $0xff,%eax
  sete   %dil
  movzbl %dil,%edi
  call   <assert@plt>
  movzbl -0x3c(%rbp),%eax
  movzbl -0x3a(%rbp),%edx
  add    %edx,%eax
  cmp    $0xff,%eax
  sete   %dil
  movzbl %dil,%edi
  call   <assert@plt>
  movzbl -0x3b(%rbp),%eax
  movzbl -0x39(%rbp),%edx
  add    %edx,%eax
  cmp    $0xff,%eax
  sete   %dil
  movzbl %dil,%edi
  call   <assert@plt>
  movzbl -0x3c(%rbp),%r12d
  shl    $0x10,%r12d
  movzbl -0x3b(%rbp),%eax
  shl    $0x8,%eax
  or     %eax,%r12d
  movslq %r12d,%r12
  movzbl -0x40(%rbp),%edx
  shl    $0x10,%edx
  movzbl -0x3f(%rbp),%eax
  shl    $0x8,%eax
  or     %eax,%edx
  movslq %edx,%rdx
  mov    %rbx,%rsi
  mov    %r14,%rdi
  call   <dump_fw@plt>
  mov    %r12,%rdx
  mov    %rbx,%rsi
  mov    %r13,%rdi
  call   <dump_fw@plt>
  mov    %rbx,%rdi
  call   <fclose@plt>
  mov    %r14,%rdi
  call   <fclose@plt>
  mov    %r13,%rdi
  call   <fclose@plt>
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L48
  mov    $0x0,%eax
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
L48:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: tag: D62
type: string
name: disassemble_data
arguments: tag: D1
type: string
name: disassemble_data
arguments: tag: D53
type: string
name: disassemble_data
arguments: tag: D31
type: string
name: disassemble_data
arguments: tag: D58
type: string
name: disassemble_data
arguments: tag: D23
type: string
name: disassemble_data
arguments: tag: D42
type: string

tool: D62: rb

tool: D1: Error opening file!

tool: D53: .fw1

tool: D31: .fw2

tool: D58: wb

tool: D23: size of %s: 0x%lx


tool: D42: The ROM size must be multiple of 0x100

assistant: ```c
int main(int argc, char *argv[]) {
  if (argc != 2)
    usage(argv[0]);
  FILE *fp = fopen(argv[1], "rb");
  if (fp == NULL) {
    puts("Error opening file!");
    exit(1);
  }
  char *basename = strrchr(argv[1], '/');
  if (basename == NULL)
    basename = argv[1];
  else
    basename = basename + 1;
  int len = strlen(basename);
  char fn1[len + 5], fn2[len + 5];
  strcpy(fn1, basename);
  strcpy(fn2, basename);
  strcat(fn1, ".fw1");
  strcat(fn2, ".fw2");
  FILE *fw1 = fopen(fn1, "wb");
  FILE *fw2 = fopen(fn2, "wb");
  long romsz;
  FseekEnd(fp, -1);
  romsz = ftell(fp) + 1;
  printf("size of %s: 0x%lx\n", argv[1], romsz);
  if (romsz & 0xff) {
    puts("The ROM size must be multiple of 0x100");
    exit(1);
  }
  unsigned char offs[8];
  FseekEnd(fp, -0x100);
  fread(offs, 8, 1, fp);
  assert(offs[0] + offs[2] == 0xff);
  assert(offs[1] + offs[3] == 0xff);
  assert(offs[4] + offs[6] == 0xff);
  assert(offs[5] + offs[7] == 0xff);
  long offw1 = (offs[0] << 16) | (offs[1] << 8);
  long offw2 = (offs[4] << 16) | (offs[5] << 8);
  dump_fw(fw1, fp, offw1);
  dump_fw(fw2, fp, offw2);
  fclose(fp);
  fclose(fw1);
  fclose(fw2);
  return 0;
}
```