user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<genericMemcachedCommand>:
  endbr64
  push   %r15
  mov    %edi,%eax
  push   %r14
  mov    %edx,%r14d
  push   %r13
  mov    %r9,%r13
  push   %r12
  push   %rbp
  mov    %r8,%rbp
  push   %rbx
  mov    %rsi,%rbx
  sub    $0x28,%rsp
  mov    %ecx,0x1c(%rsp)
  cmp    $0x2,%edi
  jle    L236
  sub    $0x3,%eax
  mov    $0xffffffff,%r8d
  cmp    $0x2,%eax
  ja     L219
  xor    %r12d,%r12d
  cmpl   $0x1,0x1c(%rsp)
  mov    %rsi,%r8
  jle    L205
  mov    0x1c(%rsp),%eax
  xor    %r15d,%r15d
  xor    %r12d,%r12d
  sub    $0x2,%eax
  mov    %rax,0x10(%rsp)
  jmp    L259
  nopl   0x0(%rax)
L75:
  test   %r13,%r13
  je     L166
  mov    0x0(%r13,%r15,8),%rdx
L187:
  movslq %r12d,%rdi
  mov    %rdx,0x8(%rsp)
  add    %rbx,%rdi
  call   <memcpy@plt>
  mov    0x8(%rsp),%rdx
  lea    (%r12,%rdx,1),%eax
  lea    0x1(%rax),%r12d
  cltq
  movb   $0x20,(%rbx,%rax,1)
  lea    0x1(%r15),%rax
  cmp    %r15,0x10(%rsp)
  je     L37
  mov    %rax,%r15
L259:
  mov    0x0(%rbp,%r15,8),%rsi
  test   %r14d,%r14d
  jne    L75
  mov    %rsi,%rdi
  call   <sdslen@plt>
  mov    0x0(%rbp,%r15,8),%rsi
  mov    %rax,%rdx
  jmp    L187
  nopl   0x0(%rax,%rax,1)
L236:
  mov    $0xffffffff,%r8d
  test   %edi,%edi
  jg     L264
L219:
  add    $0x28,%rsp
  mov    %r8d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L37:
  movslq %r12d,%r8
  add    %rbx,%r8
L205:
  movslq 0x1c(%rsp),%r15
  shl    $0x3,%r15
  lea    -0x8(%rbp,%r15,1),%rdx
  mov    (%rdx),%rsi
  test   %r14d,%r14d
  je     L116
  test   %r13,%r13
  je     L188
  mov    -0x8(%r13,%r15,1),%rbp
L72:
  add    %ebp,%r12d
  mov    %r8,%rdi
  mov    %rbp,%rdx
  call   <memcpy@plt>
  movslq %r12d,%rax
  lea    0x2(%r12),%r8d
  add    $0x1,%r12d
  movslq %r12d,%r12
  movb   $0xd,(%rbx,%rax,1)
  movb   $0xa,(%rbx,%r12,1)
  jmp    L219
  cs nopw 0x0(%rax,%rax,1)
L166:
  mov    %rsi,%rdi
  mov    %rsi,0x8(%rsp)
  call   <strlen@plt>
  mov    0x8(%rsp),%rsi
  mov    %rax,%rdx
  jmp    L187
  nopw   0x0(%rax,%rax,1)
L264:
  mov    0x1c(%rsp),%eax
  cmp    $0x1,%eax
  jle    L83
  sub    $0x2,%eax
  xor    %r15d,%r15d
  xor    %r12d,%r12d
  mov    %rax,0x10(%rsp)
  jmp    L136
  nopl   (%rax)
L164:
  test   %r13,%r13
  je     L13
  mov    0x0(%r13,%r15,8),%rdx
L1:
  movslq %r12d,%rdi
  mov    %rdx,0x8(%rsp)
  add    %rbx,%rdi
  call   <memcpy@plt>
  mov    0x8(%rsp),%rdx
  lea    (%r12,%rdx,1),%eax
  movslq %eax,%rdx
  lea    0x1(%rax),%r12d
  movb   $0x20,(%rbx,%rdx,1)
  lea    0x1(%r15),%rdx
  cmp    %r15,0x10(%rsp)
  je     L153
  mov    %rdx,%r15
L136:
  mov    0x0(%rbp,%r15,8),%rsi
  test   %r14d,%r14d
  jne    L164
  mov    %rsi,%rdi
  call   <sdslen@plt>
  mov    0x0(%rbp,%r15,8),%rsi
  mov    %rax,%rdx
  jmp    L1
  nopl   0x0(%rax,%rax,1)
L13:
  mov    %rsi,%rdi
  mov    %rsi,0x8(%rsp)
  call   <strlen@plt>
  mov    0x8(%rsp),%rsi
  mov    %rax,%rdx
  jmp    L1
  nopw   0x0(%rax,%rax,1)
L153:
  movslq %r12d,%r12
  lea    0x2(%rax),%esi
  lea    (%rbx,%r12,1),%rdx
  lea    0x3(%rax),%r12d
  movslq %esi,%rsi
  movslq %r12d,%rcx
L242:
  movslq 0x1c(%rsp),%r15
  movb   $0xd,(%rdx)
  movb   $0xa,(%rbx,%rsi,1)
  shl    $0x3,%r15
  lea    -0x8(%rbp,%r15,1),%rdx
  test   %r14d,%r14d
  je     L277
  mov    (%rdx),%rsi
  test   %r13,%r13
  je     L121
  mov    -0x8(%r13,%r15,1),%rbp
L43:
  mov    %rbp,%rdx
  lea    (%rbx,%rcx,1),%rdi
  call   <memcpy@plt>
  lea    (%r12,%rbp,1),%eax
  movslq %eax,%rdx
  lea    0x2(%rax),%r8d
  add    $0x1,%eax
  cltq
  movb   $0xd,(%rbx,%rdx,1)
  movb   $0xa,(%rbx,%rax,1)
  jmp    L219
  nopl   0x0(%rax,%rax,1)
L121:
  mov    %rsi,%rdi
  mov    %rcx,0x10(%rsp)
  mov    %rsi,0x8(%rsp)
  call   <strlen@plt>
  mov    0x8(%rsp),%rsi
  mov    0x10(%rsp),%rcx
  mov    %rax,%rbp
  jmp    L43
  nopl   0x0(%rax)
L188:
  mov    %rsi,%rdi
  mov    %r8,0x10(%rsp)
  mov    %rsi,0x8(%rsp)
  call   <strlen@plt>
  mov    0x8(%rsp),%rsi
  mov    0x10(%rsp),%r8
  mov    %rax,%rbp
  jmp    L72
  nopl   0x0(%rax)
L116:
  mov    %rsi,%rdi
  mov    %rdx,0x10(%rsp)
  mov    %r8,0x8(%rsp)
  call   <sdslen@plt>
  mov    0x10(%rsp),%rdx
  mov    0x8(%rsp),%r8
  mov    %rax,%rbp
  mov    (%rdx),%rsi
  jmp    L72
  nopw   0x0(%rax,%rax,1)
L277:
  mov    (%rdx),%rdi
  mov    %rcx,0x10(%rsp)
  mov    %rdx,0x8(%rsp)
  call   <sdslen@plt>
  mov    0x8(%rsp),%rdx
  mov    0x10(%rsp),%rcx
  mov    %rax,%rbp
  mov    (%rdx),%rsi
  jmp    L43
  nopw   0x0(%rax,%rax,1)
L83:
  mov    %rsi,%rdx
  mov    $0x2,%ecx
  mov    $0x2,%r12d
  mov    $0x1,%esi
  jmp    L242
```

assistant: ```c
int genericMemcachedCommand(int cmdtype, char *cmd, int argtype, int argc, char **argv, size_t *argvlen) {
  int j;
  size_t len;
  int pos = 0;
  switch (cmdtype) {
  case 1:
  case 2:
    for (j = 0; j < argc - 1; j++) {
      len = (argtype == 0 ? sdslen(argv[j]) : (argvlen == NULL ? strlen(argv[j]) : argvlen[j]));
      memcpy(cmd + pos, argv[j], len);
      pos += (int)len;
      cmd[pos++] = ' ';
    }
    cmd[pos++] = '\r';
    cmd[pos++] = '\n';
    len = (argtype == 0 ? sdslen(argv[argc - 1]) : (argvlen == NULL ? strlen(argv[argc - 1]) : argvlen[argc - 1]));
    memcpy(cmd + pos, argv[argc - 1], len);
    pos += (int)len;
    cmd[pos++] = '\r';
    cmd[pos++] = '\n';
    break;
  case 4:
  case 3:
  case 5:
    for (j = 0; j < argc - 1; j++) {
      len = (argtype == 0 ? sdslen(argv[j]) : (argvlen == NULL ? strlen(argv[j]) : argvlen[j]));
      memcpy(cmd + pos, argv[j], len);
      pos += len;
      cmd[pos++] = ' ';
    }
    len = (argtype == 0 ? sdslen(argv[argc - 1]) : (argvlen == NULL ? strlen(argv[argc - 1]) : argvlen[argc - 1]));
    memcpy(cmd + pos, argv[argc - 1], len);
    pos += (int)len;
    cmd[pos++] = '\r';
    cmd[pos++] = '\n';
    break;
  default:
    pos = -1;
    break;
  }
  return pos;
}
```