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

```asm
<readxy_ex>:
  endbr64
  push   %r15
  push   %r14
  mov    %rsi,%r14
  push   %r13
  push   %r12
  mov    %rcx,%r12
  push   %rbp
  mov    %r9d,%ebp
  push   %rbx
  sub    $0x108,%rsp
  mov    %rdi,0x18(%rsp)
  mov    %rdx,0x8(%rsp)
  mov    %r8,0x10(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0xf8(%rsp)
  xor    %eax,%eax
  movq   $0x0,(%rsi)
  lea    D40(%rip),%rsi
  movq   $0x0,(%rdx)
  movl   $0x0,(%rcx)
  call   <fopen@plt>
  test   %rax,%rax
  je     L137
  mov    %rax,%r13
  lea    0x30(%rsp),%rbx
  lea    0x20(%rsp),%r15
  cs nopw 0x0(%rax,%rax,1)
L178:
  mov    %r13,%rdx
  mov    $0xc7,%esi
  mov    %rbx,%rdi
  test   %ebp,%ebp
  je     L136
L119:
  call   <get_line_cf@plt>
  test   %rax,%rax
  je     L124
L96:
  mov    %rbx,%rdi
  call   <clean_line@plt>
  mov    $0x2,%edx
  mov    %r15,%rsi
  mov    %rbx,%rdi
  call   <string_read_doubles@plt>
  cmp    $0x2,%eax
  jne    L178
  addl   $0x1,(%r12)
  mov    %r13,%rdx
  mov    $0xc7,%esi
  mov    %rbx,%rdi
  test   %ebp,%ebp
  jne    L119
L136:
  call   <fgets@plt>
  test   %rax,%rax
  jne    L96
L124:
  mov    %r13,%rdi
  call   <fclose@plt>
  mov    (%r12),%r13d
  test   %r13d,%r13d
  jne    L63
  cmpq   $0x0,0x10(%rsp)
  je     L200
  mov    0x18(%rsp),%rdx
  mov    0x10(%rsp),%rdi
  lea    D61(%rip),%rsi
  call   <fprintf@plt>
  jmp    L99
  nopl   (%rax)
L138:
  mov    %r13,%rdi
  call   <fclose@plt>
  mov    0x4(%rsp),%eax
  cmp    %eax,(%r12)
  jne    L247
L200:
  xor    %r13d,%r13d
L99:
  mov    0xf8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L126
  add    $0x108,%rsp
  mov    %r13d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   (%rax)
L63:
  movslq %r13d,%rsi
  lea    D35(%rip),%rdx
  mov    %r14,%rdi
  shl    $0x4,%rsi
  call   <willus_mem_alloc@plt>
  test   %eax,%eax
  je     L167
  movslq (%r12),%rdx
  mov    (%r14),%rax
  lea    D40(%rip),%rsi
  mov    0x8(%rsp),%rcx
  mov    0x18(%rsp),%rdi
  lea    (%rax,%rdx,8),%rax
  mov    %rax,(%rcx)
  call   <fopen@plt>
  mov    %rax,%r13
  test   %rax,%rax
  je     L247
  movl   $0x0,0x4(%rsp)
  lea    0x20(%rsp),%r15
  nopl   0x0(%rax,%rax,1)
L118:
  mov    %r13,%rdx
  mov    $0xc7,%esi
  mov    %rbx,%rdi
  test   %ebp,%ebp
  je     L157
L22:
  call   <get_line_cf@plt>
L33:
  test   %rax,%rax
  je     L138
  mov    %rbx,%rdi
  call   <clean_line@plt>
  mov    $0x2,%edx
  mov    %r15,%rsi
  mov    %rbx,%rdi
  call   <string_read_doubles@plt>
  cmp    $0x2,%eax
  jne    L118
  mov    0x4(%rsp),%eax
  cmp    %eax,(%r12)
  jle    L267
  movslq 0x4(%rsp),%rax
  mov    (%r14),%rdx
  mov    %rbx,%rdi
  movsd  0x20(%rsp),%xmm0
  mov    0x8(%rsp),%rsi
  mov    %rax,%rcx
  movsd  %xmm0,(%rdx,%rax,8)
  mov    (%rsi),%rdx
  add    $0x1,%ecx
  mov    $0xc7,%esi
  movsd  0x28(%rsp),%xmm0
  mov    %ecx,0x4(%rsp)
  movsd  %xmm0,(%rdx,%rax,8)
  mov    %r13,%rdx
  test   %ebp,%ebp
  jne    L22
L157:
  call   <fgets@plt>
  jmp    L33
  nopw   0x0(%rax,%rax,1)
L267:
  mov    %r13,%rdi
  call   <fclose@plt>
  mov    %r14,%rdi
  call   <freexy@plt>
  mov    0x10(%rsp),%rdi
  test   %rdi,%rdi
  je     L108
  mov    0x18(%rsp),%rdx
  lea    D70(%rip),%rsi
  call   <fprintf@plt>
L108:
  mov    $0xfffffffd,%r13d
  jmp    L99
L247:
  mov    %r14,%rdi
  mov    $0xfffffffd,%r13d
  call   <freexy@plt>
  mov    0x10(%rsp),%rdi
  test   %rdi,%rdi
  je     L99
  mov    0x18(%rsp),%rdx
  lea    D70(%rip),%rsi
  call   <fprintf@plt>
  jmp    L99
L167:
  mov    0x10(%rsp),%rdi
  mov    $0xffffffff,%r13d
  test   %rdi,%rdi
  je     L99
  mov    0x18(%rsp),%rdx
  lea    D8(%rip),%rsi
  call   <fprintf@plt>
  jmp    L99
L137:
  mov    0x10(%rsp),%rdi
  mov    $0xfffffffe,%r13d
  test   %rdi,%rdi
  je     L99
  mov    0x18(%rsp),%rdx
  lea    D76(%rip),%rsi
  call   <fprintf@plt>
  jmp    L99
L126:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: data_label: D40
type: string
name: read_data
arguments: data_label: D61
type: string
name: read_data
arguments: data_label: D35
type: string
name: read_data
arguments: data_label: D70
type: string
name: read_data
arguments: data_label: D8
type: string
name: read_data
arguments: data_label: D76
type: string

tool: D40: r

tool: D61: There are no array pairs in file %s.


tool: D35: readxy

tool: D70: Internal error re-reading file %s.


tool: D8: There is not enough memory to read in file %s.


tool: D76: Cannot open file %s for reading array pairs.


assistant: ```c
int readxy_ex(char *filename, double **x, double **y, int *n, FILE *output, int ignore_after_semicolon) {
  FILE *f;
  static char *notenough = "There is not enough memory to read in file %s.\n";
  static char *internal = "Internal error re-reading file %s.\n";
  char buf[200];
  long memsize;
  int i;
  size_t memsizest;
  static char *funcname = "readxy";
  (*x) = NULL;
  (*y) = NULL;
  (*n) = 0;
  f = fopen(filename, "r");
  if (f == NULL) {
    if (output != NULL)
      fprintf(output, "Cannot open file %s for reading array pairs.\n", filename);
    return (-2);
  }
  while (1) {
    double v[2];
    void *ptr;
    if (ignore_after_semicolon)
      ptr = get_line_cf(buf, 199, f);
    else
      ptr = fgets(buf, 199, f);
    if (ptr == NULL)
      break;
    clean_line(buf);
    if (string_read_doubles(buf, v, 2) == 2)
      (*n)++;
  }
  fclose(f);
  if ((*n) == 0) {
    if (output != NULL)
      fprintf(output, "There are no array pairs in file %s.\n", filename);
    return (0);
  }
  memsize = (long)sizeof(double) * (*n) * 2L;
  memsizest = (size_t)memsize;
  if (memsize != memsizest) {
    if (output != NULL)
      fprintf(output, notenough, filename);
    return (-1);
  }
  if (!willus_mem_alloc(x, memsizest, funcname)) {
    if (output != NULL)
      fprintf(output, notenough, filename);
    return (-1);
  }
  (*y) = &(*x)[(*n)];
  i = 0;
  f = fopen(filename, "r");
  if (f == NULL) {
    freexy(x);
    if (output != NULL)
      fprintf(output, internal, filename);
    return (-3);
  }
  while (1) {
    double v[2];
    void *ptr;
    if (ignore_after_semicolon)
      ptr = get_line_cf(buf, 199, f);
    else
      ptr = fgets(buf, 199, f);
    if (ptr == NULL)
      break;
    clean_line(buf);
    if (string_read_doubles(buf, v, 2) == 2) {
      if (i >= (*n)) {
        fclose(f);
        freexy(x);
        if (output != NULL)
          fprintf(output, internal, filename);
        return (-3);
      }
      (*x)[i] = v[0];
      (*y)[i] = v[1];
      i++;
    }
  }
  fclose(f);
  if (i != (*n)) {
    freexy(x);
    if (output != NULL)
      fprintf(output, internal, filename);
    return (-3);
  }
  return (0);
}
```