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

```asm
<scan>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %esi,-0x1c(%rbp)
  mov    -0x18(%rbp),%rax
  mov    %rax,-0x8(%rbp)
L100:
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  mov    %al,-0x9(%rbp)
  movsbl -0x9(%rbp),%eax
  test   %eax,%eax
  je     L235
  cmp    $0x3c,%eax
  je     L219
  nop
  addq   $0x1,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  mov    %al,-0x9(%rbp)
  jmp    L8
L219:
  nop
  addq   $0x1,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  mov    %al,-0x9(%rbp)
  movsbl -0x9(%rbp),%eax
  cmp    $0x7a,%eax
  jg     L2
  cmp    $0x62,%eax
  jge    L151
  cmp    $0x61,%eax
  je     L233
  cmp    $0x61,%eax
  jg     L2
  cmp    $0x41,%eax
  je     L233
  cmp    $0x41,%eax
  jl     L2
  sub    $0x42,%eax
  cmp    $0x18,%eax
  ja     L2
  jmp    L151
L2:
  nop
L8:
  jmp    L100
L235:
  nop
  addq   $0x1,-0x8(%rbp)
  mov    $0x0,%esi
  lea    D18(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x0,%eax
  jmp    L131
L233:
  nop
  addq   $0x1,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  mov    %al,-0x9(%rbp)
  movsbl -0x9(%rbp),%eax
  cmp    $0x5a,%eax
  jg     L45
  cmp    $0x41,%eax
  jge    L75
  jmp    L159
L45:
  sub    $0x61,%eax
  cmp    $0x19,%eax
  jbe    L75
L159:
  nop
  mov    $0x1,%esi
  lea    D18(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x1,%eax
  jmp    L131
L151:
  nop
  jmp    L1
L75:
  nop
L1:
  addq   $0x1,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  mov    %al,-0x9(%rbp)
  movsbl -0x9(%rbp),%eax
  cmp    $0x5a,%eax
  jg     L230
  cmp    $0x41,%eax
  jge    L1
  jmp    L42
L230:
  sub    $0x61,%eax
  cmp    $0x19,%eax
  ja     L42
  jmp    L1
L42:
  nop
  mov    $0x2,%esi
  lea    D18(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x2,%eax
L131:
  leave
  ret
```

tool_calls: name: unpack_data
arguments: data_label: D18
type: string

tool: D18: %d


assistant: ```c
int scan(char *s, int l) {
  char *p = s;
  char *q;
cont : {
  char yych;
  if (((s + l) - p) < 3)
    ;
  yych = *p;
  switch (yych) {
  case 0x00:
    goto yy4;
  case '<':
    goto yy2;
  default:
    goto yy6;
  }
yy2:
  ++p;
  switch ((yych = *p)) {
  case 'A':
  case 'a':
    goto yy7;
  case 'B':
  case 'C':
  case 'D':
  case 'E':
  case 'F':
  case 'G':
  case 'H':
  case 'I':
  case 'J':
  case 'K':
  case 'L':
  case 'M':
  case 'N':
  case 'O':
  case 'P':
  case 'Q':
  case 'R':
  case 'S':
  case 'T':
  case 'U':
  case 'V':
  case 'W':
  case 'X':
  case 'Y':
  case 'Z':
  case 'b':
  case 'c':
  case 'd':
  case 'e':
  case 'f':
  case 'g':
  case 'h':
  case 'i':
  case 'j':
  case 'k':
  case 'l':
  case 'm':
  case 'n':
  case 'o':
  case 'p':
  case 'q':
  case 'r':
  case 's':
  case 't':
  case 'u':
  case 'v':
  case 'w':
  case 'x':
  case 'y':
  case 'z':
    goto yy9;
  default:
    goto yy3;
  }
yy3 : { goto cont; }
yy4:
  ++p;
  {
    printf("%d\n", 0);
    return 0;
  }
yy6:
  yych = *++p;
  goto yy3;
yy7:
  ++p;
  switch ((yych = *p)) {
  case 'A':
  case 'B':
  case 'C':
  case 'D':
  case 'E':
  case 'F':
  case 'G':
  case 'H':
  case 'I':
  case 'J':
  case 'K':
  case 'L':
  case 'M':
  case 'N':
  case 'O':
  case 'P':
  case 'Q':
  case 'R':
  case 'S':
  case 'T':
  case 'U':
  case 'V':
  case 'W':
  case 'X':
  case 'Y':
  case 'Z':
  case 'a':
  case 'b':
  case 'c':
  case 'd':
  case 'e':
  case 'f':
  case 'g':
  case 'h':
  case 'i':
  case 'j':
  case 'k':
  case 'l':
  case 'm':
  case 'n':
  case 'o':
  case 'p':
  case 'q':
  case 'r':
  case 's':
  case 't':
  case 'u':
  case 'v':
  case 'w':
  case 'x':
  case 'y':
  case 'z':
    goto yy9;
  default:
    goto yy8;
  }
yy8 : {
  printf("%d\n", 1);
  return 1;
}
yy9:
  ++p;
  if ((s + l) <= p)
    ;
  yych = *p;
  switch (yych) {
  case 'A':
  case 'B':
  case 'C':
  case 'D':
  case 'E':
  case 'F':
  case 'G':
  case 'H':
  case 'I':
  case 'J':
  case 'K':
  case 'L':
  case 'M':
  case 'N':
  case 'O':
  case 'P':
  case 'Q':
  case 'R':
  case 'S':
  case 'T':
  case 'U':
  case 'V':
  case 'W':
  case 'X':
  case 'Y':
  case 'Z':
  case 'a':
  case 'b':
  case 'c':
  case 'd':
  case 'e':
  case 'f':
  case 'g':
  case 'h':
  case 'i':
  case 'j':
  case 'k':
  case 'l':
  case 'm':
  case 'n':
  case 'o':
  case 'p':
  case 'q':
  case 'r':
  case 's':
  case 't':
  case 'u':
  case 'v':
  case 'w':
  case 'x':
  case 'y':
  case 'z':
    goto yy9;
  default:
    goto yy11;
  }
yy11 : {
  printf("%d\n", 2);
  return 2;
}
}
}
```