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

```asm
<atof>:
  endbr64
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  mov    %rdi,%rbx
  jmp    L73
L42:
  add    $0x1,%rbx
L73:
  movsbl (%rbx),%edi
  call   <isspace@plt>
  test   %rax,%rax
  jne    L42
  movzbl (%rbx),%eax
  cmp    $0x2d,%al
  je     L43
  mov    $0x0,%ebp
  cmp    $0x2b,%al
  je     L127
L170:
  pxor   %xmm2,%xmm2
  movss  %xmm2,0x8(%rsp)
  jmp    L133
L43:
  add    $0x1,%rbx
  mov    $0x1,%ebp
  jmp    L170
L127:
  add    $0x1,%rbx
  jmp    L170
L27:
  movsbl (%rbx),%eax
  sub    $0x30,%eax
  pxor   %xmm0,%xmm0
  cvtsi2sd %eax,%xmm0
  pxor   %xmm1,%xmm1
  cvtss2sd 0x8(%rsp),%xmm1
  mulsd  D23(%rip),%xmm1
  addsd  %xmm1,%xmm0
  pxor   %xmm3,%xmm3
  cvtsd2ss %xmm0,%xmm3
  movss  %xmm3,0x8(%rsp)
  add    $0x1,%rbx
L133:
  movsbl (%rbx),%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L27
  cmpb   $0x2e,(%rbx)
  je     L3
L26:
  movsbl (%rbx),%edi
  call   <toupper@plt>
  cmp    $0x45,%al
  je     L145
L159:
  test   %bpl,%bpl
  je     L122
  movss  0x8(%rsp),%xmm2
  xorps  D52(%rip),%xmm2
  movss  %xmm2,0x8(%rsp)
L122:
  movss  0x8(%rsp),%xmm0
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  ret
L3:
  add    $0x1,%rbx
  movss  D41(%rip),%xmm7
  movss  %xmm7,0xc(%rsp)
  jmp    L146
L24:
  movsbl (%rbx),%eax
  sub    $0x30,%eax
  pxor   %xmm0,%xmm0
  cvtsi2ss %eax,%xmm0
  movss  0xc(%rsp),%xmm4
  mulss  %xmm4,%xmm0
  addss  0x8(%rsp),%xmm0
  movss  %xmm0,0x8(%rsp)
  pxor   %xmm0,%xmm0
  cvtss2sd %xmm4,%xmm0
  mulsd  D29(%rip),%xmm0
  pxor   %xmm6,%xmm6
  cvtsd2ss %xmm0,%xmm6
  movss  %xmm6,0xc(%rsp)
  add    $0x1,%rbx
L146:
  movsbl (%rbx),%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L24
  jmp    L26
L145:
  lea    0x1(%rbx),%rdi
  call   <atoi@plt>
  mov    %eax,%edx
  test   %al,%al
  je     L159
  movss  D57(%rip),%xmm1
  movsd  D29(%rip),%xmm2
  jmp    L112
L85:
  pxor   %xmm0,%xmm0
  cvtss2sd 0x8(%rsp),%xmm0
  mulsd  %xmm2,%xmm0
  pxor   %xmm7,%xmm7
  cvtsd2ss %xmm0,%xmm7
  movss  %xmm7,0x8(%rsp)
  add    $0x1,%edx
L147:
  test   %dl,%dl
  je     L159
L112:
  test   %dl,%dl
  js     L85
  movss  0x8(%rsp),%xmm7
  mulss  %xmm1,%xmm7
  movss  %xmm7,0x8(%rsp)
  sub    $0x1,%edx
  jmp    L147
```

tool_calls: name: disassemble_data
arguments: data_label: D23
type: f64
name: disassemble_data
arguments: data_label: D52
type: byte[16]
name: disassemble_data
arguments: data_label: D41
type: f32
name: disassemble_data
arguments: data_label: D29
type: byte[8]
name: disassemble_data
arguments: data_label: D57
type: byte[4]

tool: D23: 10

tool: {"D52": [0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00]}

tool: D41: 0.1

tool: {"D29": [0x9a,0x99,0x99,0x99,0x99,0x99,0xb9,0x3f]}

tool: {"D57": [0x00,0x00,0x20,0x41]}

assistant: ```c
float atof(char *s) {
  float value, fraction;
  signed char iexp;
  char sign;
  while (isspace(*s))
    s++;
  if (*s == '-') {
    sign = 1;
    s++;
  } else {
    sign = 0;
    if (*s == '+')
      s++;
  }
  for (value = 0.0; isdigit(*s); s++) {
    value = 10.0 * value + (*s - '0');
  }
  if (*s == '.') {
    s++;
    for (fraction = 0.1; isdigit(*s); s++) {
      value += (*s - '0') * fraction;
      fraction *= 0.1;
    }
  }
  if (toupper(*s) == 'E') {
    s++;
    iexp = (signed char)atoi(s);
    {
      while (iexp != 0) {
        if (iexp < 0) {
          value *= 0.1;
          iexp++;
        } else {
          value *= 10.0;
          iexp--;
        }
      }
    }
  }
  if (sign)
    value *= -1.0;
  return (value);
}
```