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

```asm
<string_line_pack>:
  endbr64
  push   %r15
  mov    %rdi,%rdx
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x28,%rsp
  movzbl (%rdi),%eax
  cmp    $0x20,%al
  jne    L237
  nop
L493:
  movzbl 0x1(%rdx),%eax
  add    $0x1,%rdx
  cmp    $0x20,%al
  je     L493
L237:
  test   %al,%al
  je     L329
  mov    $0x1,%edi
  xor    %ecx,%ecx
  xor    %ebp,%ebp
  jmp    L263
  nop
L171:
  cmp    $0x1,%ecx
  je     L564
  cmp    $0x5c,%al
  je     L228
L564:
  cmp    $0x20,%al
  jne    L361
  or     %ecx,%edi
  jne    L361
  add    $0x1,%ebp
  mov    %esi,%eax
  xor    %ecx,%ecx
  mov    $0x1,%edi
  nopl   0x0(%rax)
L474:
  add    $0x1,%rdx
  test   %al,%al
  je     L360
L263:
  movzbl 0x1(%rdx),%esi
  cmp    $0x2,%ecx
  je     L330
  cmp    $0x27,%al
  je     L141
L330:
  cmp    $0x22,%al
  jne    L171
  cmp    $0x1,%ecx
  je     L361
  test   %ecx,%ecx
  mov    %esi,%eax
  sete   %cl
  add    $0x1,%rdx
  movzbl %cl,%ecx
  add    %ecx,%ecx
  test   %al,%al
  jne    L263
L360:
  lea    0x1(%rbp),%r13d
  test   %edi,%edi
  jne    L139
  lea    0x10(,%rbp,8),%edi
  mov    %r13d,%ebp
  call   <malloc@plt>
  mov    %rax,%r12
L208:
  xor    %r15d,%r15d
  jmp    L131
  nopl   (%rax)
L312:
  add    $0x1,%rbx
L131:
  movzbl (%rbx),%eax
  cmp    $0x20,%al
  je     L312
  mov    %rbx,%r13
  test   %al,%al
  je     L362
  xor    %ecx,%ecx
  xor    %edx,%edx
  jmp    L82
  nopl   0x0(%rax)
L106:
  cmp    $0x5c,%al
  je     L241
L357:
  test   %edx,%edx
  jne    L45
  cmp    $0x20,%al
  je     L38
L45:
  mov    %rbx,%rax
L292:
  lea    0x1(%rax),%rbx
  movzbl 0x1(%rax),%eax
  test   %al,%al
  je     L38
L82:
  cmp    $0x27,%al
  jne    L334
  cmp    $0x2,%edx
  jne    L353
L334:
  cmp    $0x22,%al
  jne    L106
  mov    %rbx,%rax
  cmp    $0x1,%edx
  je     L292
  test   %edx,%edx
  lea    0x1(%rax),%rbx
  movzbl 0x1(%rax),%eax
  sete   %dl
  sub    $0x1,%ecx
  movzbl %dl,%edx
  add    %edx,%edx
  test   %al,%al
  jne    L82
  nopl   0x0(%rax)
L38:
  mov    %rbx,%rax
  sub    %r13,%rax
  lea    (%rcx,%rax,1),%r14d
  lea    0x1(%r14),%edi
  call   <malloc@plt>
  mov    %rax,%r8
  test   %rax,%rax
  je     L348
  movslq %r14d,%rcx
  xor    %esi,%esi
  xor    %edx,%edx
  lea    (%rax,%rcx,1),%r14
  cmp    %rbx,%r13
  jne    L170
  jmp    L278
  nopl   0x0(%rax)
L328:
  cmp    $0x22,%al
  je     L394
  cmp    $0x1,%edx
  je     L408
  cmp    $0x5c,%al
  jne    L408
  movsbl 0x1(%r13),%edi
  test   %dil,%dil
  jne    L12
  nop
L408:
  movslq %esi,%rdi
  add    $0x1,%esi
  mov    %al,(%r8,%rdi,1)
L565:
  add    $0x1,%r13
  cmp    %rbx,%r13
  je     L278
L170:
  movzbl 0x0(%r13),%eax
  cmp    $0x27,%al
  jne    L328
  cmp    $0x2,%edx
  je     L408
  add    $0x1,%r13
  xor    $0x1,%edx
  cmp    %rbx,%r13
  jne    L170
  nopl   (%rax)
L278:
  movb   $0x0,(%r14)
  mov    %r8,(%r12,%r15,8)
  add    $0x1,%r15
  cmp    %r15d,%ebp
  jg     L131
  movslq %ebp,%rbp
  lea    (%r12,%rbp,8),%rax
L384:
  movq   $0x0,(%rax)
L471:
  add    $0x28,%rsp
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   (%rax)
L361:
  cmp    $0x20,%al
  sete   %al
  xor    %edi,%edi
  test   %ecx,%ecx
  sete   %dil
  and    %eax,%edi
  mov    %esi,%eax
  jmp    L474
  xchg   %ax,%ax
L141:
  xor    $0x1,%ecx
  mov    %esi,%eax
  jmp    L474
L228:
  test   %sil,%sil
  je     L361
  movzbl 0x2(%rdx),%eax
  xor    %edi,%edi
  add    $0x1,%rdx
  jmp    L474
  xchg   %ax,%ax
L353:
  xor    $0x1,%edx
  sub    $0x1,%ecx
  mov    %rbx,%rax
  jmp    L292
  xchg   %ax,%ax
L241:
  cmp    $0x1,%edx
  je     L45
  cmpb   $0x0,0x1(%rbx)
  je     L357
  sub    $0x1,%ecx
  lea    0x1(%rbx),%rax
  jmp    L292
  nop
L394:
  cmp    $0x1,%edx
  je     L408
  test   %edx,%edx
  sete   %dl
  movzbl %dl,%edx
  add    %edx,%edx
  jmp    L565
  nopl   0x0(%rax,%rax,1)
L12:
  lea    0x1(%rsi),%eax
  mov    %r8,0x18(%rsp)
  add    $0x1,%r13
  mov    %edx,0x14(%rsp)
  mov    %esi,0x10(%rsp)
  mov    %eax,0xc(%rsp)
  call   <char_unescape@plt>
  movslq 0x10(%rsp),%rsi
  mov    0x18(%rsp),%r8
  mov    0x14(%rsp),%edx
  mov    %al,(%r8,%rsi,1)
  mov    0xc(%rsp),%esi
  jmp    L565
L348:
  mov    %r12,%rdi
  xor    %r12d,%r12d
  call   <string_pack_free@plt>
  jmp    L471
L362:
  mov    $0x1,%edi
  call   <malloc@plt>
  mov    %rax,%r8
  test   %rax,%rax
  je     L348
  mov    %rax,%r14
  jmp    L278
L139:
  lea    0x0(,%r13,8),%edi
  call   <malloc@plt>
  mov    %rax,%r12
  test   %ebp,%ebp
  jne    L208
  jmp    L384
  nop
L329:
  mov    $0x8,%edi
  call   <malloc@plt>
  mov    %rax,%r12
  jmp    L384
```

assistant: ```c
char **string_line_pack(const char *buf) {
  const char delimiter = ' ', *p = buf;
  int elements = 0, quote = 0;
  bool isdelimiter = true;
  while (*p == delimiter)
    ++p;
  while (*p != '\0') {
    if (*p == '\'' && quote != 2)
      quote = quote == 0 ? 1 : 0;
    else if (*p == '"' && quote != 1)
      quote = quote == 0 ? 2 : 0;
    else if (*p == '\\' && quote != 1 && *(p + 1) != '\0') {
      isdelimiter = false;
      ++p;
    } else {
      if (*p == delimiter && !isdelimiter && quote == 0)
        ++elements;
      isdelimiter = (*p == delimiter && quote == 0);
    }
    ++p;
  }
  if (!isdelimiter)
    ++elements;
  char **packed = (char **)malloc((elements + 1) * sizeof(char *));
  const char *q = buf;
  for (int i = 0; i < elements; i++) {
    int length = 0;
    quote = 0;
    while (*q == delimiter)
      ++q;
    p = q;
    while (*p != '\0') {
      if (*p == '\'' && quote != 2) {
        quote = quote == 0 ? 1 : 0;
        length -= 1;
      } else if (*p == '"' && quote != 1) {
        quote = quote == 0 ? 2 : 0;
        length -= 1;
      } else if (*p == '\\' && quote != 1 && *(p + 1) != '\0') {
        length -= 1;
        p += 1;
      } else if (quote == 0 && *p == delimiter)
        break;
      ++p;
    }
    length += p - q;
    char *newstr = (char *)malloc(length + 1);
    if (!newstr) {
      string_pack_free(packed);
      return NULL;
    }
    int j = 0;
    quote = 0;
    for (; q != p; q++) {
      if (*q == '\'' && quote != 2)
        quote = quote == 0 ? 1 : 0;
      else if (*q == '"' && quote != 1)
        quote = quote == 0 ? 2 : 0;
      else if (*q == '\\' && quote != 1 && *(q + 1) != '\0') {
        newstr[j] = char_unescape(*(q + 1));
        ++j;
        q += 1;
      } else {
        newstr[j] = *q;
        ++j;
      }
    }
    newstr[length] = '\0';
    packed[i] = newstr;
  }
  packed[elements] = NULL;
  return packed;
}
```