user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<split>:
  endbr64
  push   %rbx
  mov    %rdi,%rax
  mov    %rsi,%r9
  mov    %edx,%r8d
  movzbl (%rcx),%esi
  test   %sil,%sil
  jne    L532
L171:
  lea    0x1(%rax),%rcx
  movzbl -0x1(%rcx),%edx
  cmp    $0x9,%dl
  je     L24
  cmp    $0x20,%dl
  je     L24
  mov    $0x0,%r10d
  cmpb   $0x0,(%rax)
  je     L158
  mov    $0x9,%edi
  mov    $0x1,%ebx
  mov    $0x20,%esi
L320:
  mov    %r8d,%r11d
  jmp    L527
L24:
  mov    %rcx,%rax
  jmp    L171
L532:
  mov    $0x0,%r10d
  cmpb   $0x0,(%rdi)
  je     L158
  movzbl 0x1(%rcx),%edi
  test   %dil,%dil
  jne    L263
  lea    0x8(%r9),%rdi
  mov    %rax,(%r9)
  mov    %edx,%ecx
  sub    $0x1,%ecx
  je     L40
L318:
  add    $0x1,%rax
  movzbl -0x1(%rax),%edx
  cmp    %dl,%sil
  je     L38
  test   %dl,%dl
  jne    L318
  sub    %ecx,%r8d
  mov    %r8d,%r10d
L158:
  mov    %r10d,%eax
  pop    %rbx
  ret
L38:
  movb   $0x0,-0x1(%rax)
  add    $0x8,%rdi
  mov    %rax,-0x8(%rdi)
  sub    $0x1,%ecx
  jne    L318
L40:
  mov    %r8d,%r10d
  jmp    L455
L118:
  add    $0x1,%r10d
L455:
  add    $0x1,%rax
  movzbl -0x1(%rax),%edx
  cmp    %dl,%sil
  je     L118
  test   %dl,%dl
  jne    L455
  jmp    L158
L263:
  cmpb   $0x0,0x2(%rcx)
  je     L415
  mov    $0x0,%r10d
L67:
  cmp    %r8d,%r10d
  jge    L378
  mov    %rax,(%r9)
  lea    0x8(%r9),%r9
L378:
  add    $0x1,%r10d
  jmp    L385
L415:
  mov    $0x0,%ebx
  jmp    L320
L279:
  test   %r11d,%r11d
  je     L345
  movb   $0x0,-0x1(%rcx)
  mov    %rcx,%rax
L502:
  lea    0x1(%rax),%rcx
  movzbl -0x1(%rcx),%edx
  cmp    %dl,%dil
  je     L461
  cmp    %dl,%sil
  je     L461
L527:
  add    $0x8,%r9
  mov    %rax,-0x8(%r9)
  mov    %r11d,%r10d
  sub    $0x1,%r11d
  mov    %rax,%rcx
L319:
  add    $0x1,%rcx
  movzbl -0x1(%rcx),%edx
  cmp    %dl,%sil
  je     L279
  cmp    %dl,%dil
  je     L279
  test   %dl,%dl
  jne    L319
  test   %ebx,%ebx
  je     L266
  cmpb   $0x0,(%rax)
  cmove  %r10d,%r11d
L266:
  sub    %r11d,%r8d
  mov    %r8d,%r10d
  jmp    L158
L345:
  mov    %r8d,%r10d
  test   %dl,%dl
  jne    L172
L214:
  test   %ebx,%ebx
  je     L158
  sub    $0x1,%rcx
L337:
  sub    $0x1,%rcx
  movzbl (%rcx),%eax
  cmp    %al,%dil
  je     L337
  cmp    %al,%sil
  je     L337
  cmpb   $0x0,0x1(%rcx)
  je     L158
  add    $0x1,%r8d
  cmp    %r10d,%r8d
  je     L538
L249:
  sub    $0x1,%r10d
  jmp    L158
L461:
  mov    %rcx,%rax
  jmp    L502
L95:
  mov    %rdx,%rcx
L172:
  lea    0x1(%rcx),%rdx
  movzbl -0x1(%rdx),%eax
  cmp    %al,%dil
  je     L95
  cmp    %al,%sil
  je     L95
  add    $0x1,%r10d
L137:
  add    $0x1,%rcx
  movzbl -0x1(%rcx),%eax
  test   %al,%al
  je     L214
  cmp    %al,%sil
  je     L172
  cmp    %al,%dil
  je     L172
  jmp    L137
L538:
  movb   $0x0,0x1(%rcx)
  jmp    L249
L146:
  test   %sil,%sil
  jne    L294
L385:
  add    $0x1,%rax
  movzbl -0x1(%rax),%edi
  test   %dil,%dil
  je     L158
  mov    %rcx,%rdx
L386:
  add    $0x1,%rdx
  movzbl -0x1(%rdx),%esi
  cmp    %sil,%dil
  je     L146
  test   %sil,%sil
  jne    L386
  jmp    L146
L294:
  cmp    %r10d,%r8d
  jle    L227
  movb   $0x0,-0x1(%rax)
L227:
  mov    %rax,%rdi
  jmp    L228
L58:
  test   %sil,%sil
  je     L67
L228:
  mov    %rdi,%rax
  add    $0x1,%rdi
  movzbl -0x1(%rdi),%r11d
  mov    %rcx,%rdx
L358:
  add    $0x1,%rdx
  movzbl -0x1(%rdx),%esi
  cmp    %sil,%r11b
  je     L58
  test   %sil,%sil
  jne    L358
  jmp    L58
```

assistant: ```c
int split(string, fields, nfields, sep)
char *string;
char *fields[];
int nfields;
char *sep;
{
  char *p = string;
  char c;
  char sepc = sep[0];
  char sepc2;
  int fn;
  char **fp = fields;
  char *sepp;
  int trimtrail;
  if (sepc == '\0') {
    while ((c = *p++) == ' ' || c == '\t')
      continue;
    p--;
    trimtrail = 1;
    sep = (char *)" \t";
    sepc = ' ';
  } else
    trimtrail = 0;
  sepc2 = sep[1];
  if (*p == '\0')
    return (0);
  if (sepc2 == '\0') {
    fn = nfields;
    for (;;) {
      *fp++ = p;
      fn--;
      if (fn == 0)
        break;
      while ((c = *p++) != sepc)
        if (c == '\0')
          return (nfields - fn);
      *(p - 1) = '\0';
    }
    fn = nfields;
    for (;;) {
      while ((c = *p++) != sepc)
        if (c == '\0')
          return (fn);
      fn++;
    }
  }
  if (sep[2] == '\0') {
    fn = nfields;
    for (;;) {
      *fp++ = p;
      fn--;
      while ((c = *p++) != sepc && c != sepc2)
        if (c == '\0') {
          if (trimtrail && **(fp - 1) == '\0')
            fn++;
          return (nfields - fn);
        }
      if (fn == 0)
        break;
      *(p - 1) = '\0';
      while ((c = *p++) == sepc || c == sepc2)
        continue;
      p--;
    }
    fn = nfields;
    while (c != '\0') {
      while ((c = *p++) == sepc || c == sepc2)
        continue;
      p--;
      fn++;
      while ((c = *p++) != '\0' && c != sepc && c != sepc2)
        continue;
    }
    if (trimtrail) {
      p--;
      while ((c = *--p) == sepc || c == sepc2)
        continue;
      p++;
      if (*p != '\0') {
        if (fn == nfields + 1)
          *p = '\0';
        fn--;
      }
    }
    return (fn);
  }
  fn = 0;
  for (;;) {
    if (fn < nfields)
      *fp++ = p;
    fn++;
    for (;;) {
      c = *p++;
      if (c == '\0')
        return (fn);
      sepp = sep;
      while ((sepc = *sepp++) != '\0' && sepc != c)
        continue;
      if (sepc != '\0')
        break;
    }
    if (fn < nfields)
      *(p - 1) = '\0';
    for (;;) {
      c = *p++;
      sepp = sep;
      while ((sepc = *sepp++) != '\0' && sepc != c)
        continue;
      if (sepc == '\0')
        break;
    }
    p--;
  }
}
```