user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<RGB24toBGR32>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %rdi,0x8(%rsp)
  mov    %edx,0x18(%rsp)
  mov    %ecx,%ebx
  mov    %r8d,0x10(%rsp)
  mov    %r9d,%r15d
  mov    0x90(%rsp),%rbp
  mov    0xa8(%rsp),%r12d
  mov    0xb0(%rsp),%r13d
  mov    0xc0(%rsp),%r14d
  mov    %fs:0x28,%rax
  mov    %rax,0x38(%rsp)
  xor    %eax,%eax
  lea    0x34(%rsp),%rax
  push   %rax
  lea    0x38(%rsp),%rax
  push   %rax
  mov    0xd8(%rsp),%eax
  push   %rax
  push   %r14
  mov    0xd8(%rsp),%eax
  push   %rax
  push   %r13
  push   %r12
  mov    0xd8(%rsp),%eax
  push   %rax
  mov    0xd8(%rsp),%eax
  push   %rax
  push   %rbp
  mov    0xd8(%rsp),%eax
  push   %rax
  mov    0xd8(%rsp),%eax
  push   %rax
  call   <chk_args@plt>
  add    $0x60,%rsp
  test   %eax,%eax
  je     L127
  test   %r12d,%r12d
  js     L263
L31:
  test   %ebx,%ebx
  js     L153
L163:
  mov    0x30(%rsp),%eax
  cmp    $0x1,%eax
  je     L172
  cmp    $0x2,%eax
  jne    L168
  cmpl   $0x2,0x34(%rsp)
  jne    L133
  lea    0x0(%r13,%r13,2),%eax
  movslq %eax,%rdx
  mov    %r12d,%eax
  imul   0xb8(%rsp),%eax
  cltq
  add    %rdx,%rax
  add    %rax,%rbp
  mov    0x10(%rsp),%r8d
  shl    $0x2,%r8d
  movslq %r8d,%r8
  imul   %ebx,%r15d
  movslq %r15d,%rax
  add    %rax,%r8
  add    0x8(%rsp),%r8
  cmpl   $0x0,0xc8(%rsp)
  jle    L166
  lea    0x0(,%r14,8),%r15d
  movslq %r15d,%rax
  neg    %rax
  mov    %rax,0x8(%rsp)
  movslq %r12d,%r12
  lea    (%r14,%r14,2),%eax
  cltq
  sub    %rax,%r12
  mov    %r12,0x18(%rsp)
  lea    (%rbx,%rbx,1),%eax
  cltq
  mov    %rax,0x10(%rsp)
  lea    -0x1(%r14),%eax
  add    $0x1,%rax
  lea    (%rax,%rax,2),%r13
  shl    $0x3,%rax
  mov    %rax,0x28(%rsp)
  mov    $0x0,%r12d
  movslq %ebx,%rax
  mov    %rax,0x20(%rsp)
  mov    %r8,%rbx
  jmp    L51
L263:
  mov    0xa0(%rsp),%eax
  sub    $0x1,%eax
  imul   %r12d,%eax
  cltq
  sub    %rax,%rbp
  jmp    L31
L153:
  mov    0x18(%rsp),%eax
  sub    $0x1,%eax
  imul   %ebx,%eax
  cltq
  sub    %rax,0x8(%rsp)
  jmp    L163
L172:
  mov    $0xffffffff,%eax
  cmpl   $0x1,0x34(%rsp)
  jne    L201
  lea    0x0(%r13,%r13,2),%edi
  movslq %edi,%rdi
  mov    %r12d,%eax
  imul   0xb8(%rsp),%eax
  cltq
  add    %rax,%rdi
  add    %rbp,%rdi
  mov    0x10(%rsp),%r8d
  shl    $0x2,%r8d
  movslq %r8d,%r8
  mov    %r15d,%eax
  imul   %ebx,%eax
  cltq
  add    %rax,%r8
  add    0x8(%rsp),%r8
  cmpl   $0x0,0x88(%rsp)
  jle    L14
  mov    0x80(%rsp),%eax
  lea    (%rax,%rax,2),%eax
  mov    %r12d,%ebp
  sub    %eax,%ebp
  movslq %ebp,%rbp
  mov    0x80(%rsp),%eax
  shl    $0x2,%eax
  sub    %eax,%ebx
  movslq %ebx,%rbx
  mov    0x80(%rsp),%eax
  lea    -0x1(%rax),%r11d
  add    $0x1,%r11
  lea    (%r11,%r11,2),%r10
  shl    $0x2,%r11
  mov    $0x0,%r9d
  mov    %eax,%r12d
  mov    0x88(%rsp),%r13d
  jmp    L246
L229:
  movzbl (%rdx),%eax
  shl    $0x10,%eax
  movzbl 0x1(%rdx),%r14d
  shl    $0x8,%r14d
  or     %r14d,%eax
  movzbl 0x2(%rdx),%r14d
  or     %r14d,%eax
  mov    %eax,(%rcx)
  add    $0x4,%rcx
  add    $0x3,%rdx
  cmp    %rsi,%rdx
  jne    L229
  add    %r11,%r8
  add    %r10,%rdi
L183:
  add    %rbp,%rdi
  add    %rbx,%r8
  add    $0x1,%r9d
  cmp    %r9d,%r13d
  je     L79
L246:
  lea    (%rdi,%r10,1),%rsi
  mov    %r8,%rcx
  mov    %rdi,%rdx
  test   %r12d,%r12d
  jne    L229
  jmp    L183
L108:
  movzbl (%rdx),%eax
  shl    $0x10,%eax
  movzbl 0x1(%rdx),%esi
  shl    $0x8,%esi
  or     %esi,%eax
  movzbl 0x2(%rdx),%esi
  or     %esi,%eax
  mov    %eax,(%rcx)
  mov    %eax,0x4(%rcx)
  add    $0x8,%rcx
  add    $0x3,%rdx
  cmp    %rdi,%rdx
  jne    L108
  add    0x28(%rsp),%rbx
  add    %r13,%rbp
L114:
  add    0x8(%rsp),%rbx
  mov    0x20(%rsp),%rax
  lea    (%rbx,%rax,1),%rdi
  mov    %r15d,%edx
  mov    %rbx,%rsi
  call   <memcpy@plt>
  add    0x18(%rsp),%rbp
  add    0x10(%rsp),%rbx
  add    $0x1,%r12d
  cmp    %r12d,0xc8(%rsp)
  je     L38
L51:
  lea    0x0(%rbp,%r13,1),%rdi
  mov    %rbx,%rcx
  mov    %rbp,%rdx
  test   %r14d,%r14d
  jne    L108
  jmp    L114
L127:
  mov    $0xffffffff,%eax
  jmp    L201
L14:
  mov    $0x0,%eax
  jmp    L201
L79:
  mov    $0x0,%eax
  jmp    L201
L168:
  mov    $0xffffffff,%eax
  jmp    L201
L133:
  mov    $0xffffffff,%eax
  jmp    L201
L166:
  mov    $0x0,%eax
  jmp    L201
L38:
  mov    $0x0,%eax
L201:
  mov    0x38(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L239
  add    $0x48,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L239:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
int RGB24toBGR32(unsigned char *dest_ptr, int dest_width, int dest_height, int dest_pitch, int dest_x, int dest_y, int dest_dx, int dest_dy, unsigned char *src_ptr, int src_width, int src_height, int src_pitch, int src_x, int src_y, int src_dx, int src_dy) {
  int scale_x, scale_y;
  if (!chk_args(dest_ptr, dest_width, dest_height, dest_pitch, dest_x, dest_y, dest_dx, dest_dy, src_ptr, src_width, src_height, src_pitch, src_x, src_y, src_dx, src_dy, &scale_x, &scale_y))
    return -1;
  if (src_pitch < 0)
    src_ptr -= (src_height - 1) * src_pitch;
  if (dest_pitch < 0)
    dest_ptr -= (dest_height - 1) * dest_pitch;
  if (scale_x == 1 && scale_y == 1) {
    unsigned char *s, *d;
    register int i;
    s = src_ptr + src_x * 3 + src_y * src_pitch;
    d = dest_ptr + dest_x * 4 + dest_y * dest_pitch;
    for (i = 0; i < dest_dy; i++) {
      register int ddx = dest_dx;
      while (ddx) {
        *(unsigned int *)d = (unsigned int)(s[0] << 16) | (s[1] << 8) | s[2];
        d += 4;
        s += 3;
        ddx--;
      }
      s += src_pitch - dest_dx * 3;
      d += dest_pitch - dest_dx * 4;
    }
    return 0;
  }
  if (scale_x == 2 && scale_y == 2) {
    unsigned char *s, *d;
    register int i;
    s = src_ptr + src_x * 3 + src_y * src_pitch;
    d = dest_ptr + dest_x * 4 + dest_y * dest_pitch;
    for (i = 0; i < src_dy; i++) {
      register int sdx = src_dx;
      while (sdx) {
        register unsigned int a;
        a = (unsigned int)(s[0] << 16) | (s[1] << 8) | s[2];
        *(unsigned int *)d = a;
        *(unsigned int *)(d + 4) = a;
        d += 2 * 4;
        s += 3;
        sdx--;
      }
      s -= src_dx * 3;
      d -= src_dx * 2 * 4;
      memcpy(d + dest_pitch, d, src_dx * 2 * 4);
      s += src_pitch;
      d += dest_pitch * 2;
    }
    return 0;
  }
  return -1;
}
```