user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<malloc_and_copy>:
  endbr64
  push   %r15
  mov    %edx,%eax
  mov    %ecx,%r15d
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  test   %eax,%eax
  mov    %edx,0x28(%rsp)
  movzbl (%rdi),%edx
  setg   %cl
  test   %dl,%dl
  setne  %al
  and    %al,%cl
  mov    %cl,0x2f(%rsp)
  je     L55
  xor    %r14d,%r14d
  xor    %ebp,%ebp
  mov    %rdi,%r8
  mov    %r14,%r12
  nop
L32:
  movslq %ebp,%r13
  movzbl 0x2f(%rsp),%edi
  lea    0x1(%r8,%r13,1),%rax
  add    %r8,%r13
  cmp    %dl,%r15b
  je     L63
  jmp    L150
  nopw   0x0(%rax,%rax,1)
L99:
  test   %dil,%dil
  je     L150
L63:
  movzbl (%rax),%edx
  add    $0x1,%ebp
  mov    %rax,%r13
  test   %dl,%dl
  setne  %dil
  add    $0x1,%rax
  cmp    %r15b,%dl
  je     L99
L150:
  lea    0x0(,%r12,8),%r9
  cmp    %dl,%r15b
  je     L140
  test   %dil,%dil
  je     L140
  movslq %ebp,%rdx
  mov    %ebp,%ebx
  lea    0x1(%r8,%rdx,1),%rax
  jmp    L34
  nopl   0x0(%rax,%rax,1)
L160:
  test   %cl,%cl
  je     L68
L34:
  movzbl (%rax),%ecx
  mov    %ebx,%r14d
  mov    %rax,%r13
  add    $0x1,%ebx
  add    $0x1,%rax
  cmp    %r15b,%cl
  jne    L160
L68:
  mov    %ebx,%edi
  mov    %r9,0x20(%rsp)
  sub    %ebp,%edi
  mov    %rdx,0x18(%rsp)
  add    $0x1,%edi
  mov    %r8,0x10(%rsp)
  mov    %rsi,0x8(%rsp)
  call   <malloc@plt>
  mov    0x8(%rsp),%rsi
  mov    0x20(%rsp),%r9
  mov    %rax,%rdi
  mov    0x10(%rsp),%r8
  mov    0x18(%rsp),%rdx
  mov    (%rsi),%rax
  test   %rdi,%rdi
  mov    %rdi,(%rax,%r9,1)
  je     L66
  cmp    %ebp,%ebx
  jle    L106
  xor    %eax,%eax
  lea    (%r8,%rdx,1),%r11
  lea    -0x1(%rbp),%r10d
  jmp    L112
  nopl   0x0(%rax)
L50:
  mov    (%rsi),%rdx
  mov    (%rdx,%r9,1),%rdi
L112:
  movzbl (%r11,%rax,1),%edx
  mov    %dl,(%rdi,%rax,1)
  add    $0x1,%rax
  lea    (%r10,%rax,1),%edx
  cmp    %edx,%r14d
  jg     L50
  mov    %r14d,%edi
  mov    $0x1,%edx
  mov    (%rsi),%rax
  sub    %ebp,%edi
  add    $0x1,%edi
  cmp    %r14d,%ebp
  mov    %ebx,%ebp
  cmovg  %edx,%edi
  movslq %edi,%rdi
  add    (%rax,%r9,1),%rdi
L122:
  movb   $0x0,(%rdi)
  movzbl 0x0(%r13),%edx
  lea    0x1(%r12),%eax
  cmp    %eax,0x28(%rsp)
  setg   %dil
  test   %dl,%dl
  setne  %al
  add    $0x1,%r12
  test   %al,%dil
  jne    L32
L55:
  mov    0x28(%rsp),%eax
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   (%rax)
L140:
  mov    $0x1,%edi
  mov    %rsi,0x18(%rsp)
  mov    %r8,0x10(%rsp)
  mov    %r9,0x8(%rsp)
  call   <malloc@plt>
  mov    0x18(%rsp),%rsi
  mov    0x8(%rsp),%r9
  mov    %rax,%rdi
  mov    0x10(%rsp),%r8
  mov    (%rsi),%rax
  test   %rdi,%rdi
  mov    %rdi,(%rax,%r9,1)
  jne    L122
L66:
  add    $0x38,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L106:
  mov    %ebx,%ebp
  jmp    L122
```

assistant: ```c
int malloc_and_copy(char *s, char ***tab, int words, char c) {
  int i;
  int j;
  int k;
  int flag;
  i = 0;
  j = 0;
  while (s[i] && j < words) {
    while (s[i] && s[i] == c)
      i++;
    flag = i;
    while (s[i] && s[i] != c)
      i++;
    (*tab)[j] = (char *)malloc(sizeof(char) * (i - flag + 1));
    if ((*tab)[j] == 0)
      return (0);
    k = 0;
    while (flag < i)
      (*tab)[j][k++] = s[flag++];
    (*tab)[j][k] = '\0';
    j++;
  }
  return (words);
}
```