user: 请将以下的汇编代码转换成C语言代码:

```asm
<fc_damerau0>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  mov    %rdi,%rbp
  mov    %rsi,%r12
  mov    %edx,%r13d
  mov    %rcx,%rbx
  mov    %r8d,%r14d
  cmp    %r8d,%edx
  setge  %r15b
  cmp    $0x1000,%r8d
  setbe  %al
  and    %r15d,%eax
  cmp    $0x1000,%edx
  setbe  %dil
  movzbl %dil,%edi
  and    %eax,%edi
  call   <assert@plt>
  movzbl %r15b,%edi
  call   <assert@plt>
  test   %r14d,%r14d
  je     L171
L182:
  mov    (%rbx),%rax
  cmp    %rax,(%r12)
  jne    L237
  add    $0x8,%r12
  add    $0x8,%rbx
  sub    $0x1,%r13d
  sub    $0x1,%r14d
  jne    L182
  jmp    L171
L237:
  test   %r14d,%r14d
  je     L171
  movslq %r14d,%r8
  movslq %r13d,%rax
  sub    %r8,%rax
  lea    (%r12,%rax,8),%rax
L2:
  mov    %r8d,%r10d
  mov    -0x8(%rbx,%r8,8),%rsi
  cmp    %rsi,-0x8(%rax,%r8,8)
  jne    L22
  sub    $0x1,%r13d
  sub    $0x1,%r8
  test   %r8d,%r8d
  jne    L2
L171:
  mov    %r13d,%eax
  jmp    L107
L22:
  test   %r8d,%r8d
  je     L97
  movslq %r8d,%rax
  lea    0x4(,%rax,4),%r11
  lea    0x0(%rbp,%r11,1),%rdi
  lea    (%rdi,%r11,1),%rsi
  js     L200
  mov    %r8d,%ecx
  mov    $0x0,%eax
L185:
  mov    %eax,(%rdi,%rax,4)
  mov    %rax,%rdx
  add    $0x1,%rax
  cmp    %rcx,%rdx
  jne    L185
L200:
  test   %r13d,%r13d
  jle    L145
  mov    %r12,%rcx
  add    $0x1,%r13d
  mov    $0x1,%r9d
  lea    0x1(%r8),%r12d
  jmp    L15
L199:
  mov    -0x4(%rdi,%rax,4),%edx
  mov    %edx,(%rsi,%rax,4)
L105:
  add    $0x1,%rax
  cmp    %rax,%r12
  je     L143
L218:
  mov    -0x8(%rbx,%rax,8),%rdx
  cmp    %rdx,(%rcx)
  je     L199
  mov    -0x4(%rsi,%rax,4),%edx
  add    $0x1,%edx
  mov    (%rdi,%rax,4),%r15d
  lea    0x1(%r15),%r14d
  cmp    %r14d,%edx
  cmovg  %r14d,%edx
  mov    -0x4(%rdi,%rax,4),%r15d
  lea    0x1(%r15),%r14d
  cmp    %r14d,%edx
  cmovg  %r14d,%edx
  mov    %edx,(%rsi,%rax,4)
  cmp    $0x1,%r9d
  jle    L105
  cmp    $0x1,%eax
  jle    L105
  mov    -0x8(%rbx,%rax,8),%r15
  cmp    %r15,-0x8(%rcx)
  jne    L105
  mov    -0x10(%rbx,%rax,8),%r15
  cmp    %r15,(%rcx)
  jne    L105
  mov    -0x8(%rbp,%rax,4),%r8d
  add    $0x1,%r8d
  cmp    %edx,%r8d
  cmovg  %edx,%r8d
  mov    %r8d,(%rsi,%rax,4)
  jmp    L105
L143:
  add    $0x1,%r9d
  add    $0x8,%rcx
  mov    %rdi,%rax
  mov    %rsi,%rdi
  cmp    %r9d,%r13d
  je     L239
  mov    %rbp,%rsi
  mov    %rax,%rbp
L15:
  mov    %r9d,(%rsi)
  test   %r10d,%r10d
  jle    L143
  mov    $0x1,%eax
  jmp    L218
L145:
  mov    %rdi,%rsi
L239:
  mov    -0x4(%rsi,%r11,1),%eax
L107:
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L97:
  mov    %r13d,%eax
  jmp    L107
```

assistant: ```c
int32_t fc_damerau0(int32_t *matrix, const char32_t *seq1, int32_t len1, const char32_t *seq2, int32_t len2) {
  assert((len1 >= 0 && len1 <= 4096) && (len2 >= 0 && len2 <= 4096) && len1 >= len2);
  do {
    assert(len1 >= len2);
    while (len2 && *seq1 == *seq2) {
      seq1++;
      seq2++;
      len1--;
      len2--;
    }
    while (len2 && seq1[len1 - 1] == seq2[len2 - 1]) {
      len1--;
      len2--;
    }
  } while (0);
  if (len2 == 0)
    return len1;
  int32_t *transpos = matrix;
  int32_t *previous = &transpos[len2 + 1];
  int32_t *current = &previous[len2 + 1];
  for (int32_t j = 0; j <= len2; j++)
    previous[j] = j;
  for (int32_t i = 1; i <= len1; i++) {
    current[0] = i;
    for (int32_t j = 1; j <= len2; j++) {
      if (seq1[i - 1] == seq2[j - 1]) {
        current[j] = previous[j - 1];
      } else {
        const int32_t ic = current[j - 1] + 1;
        const int32_t dc = previous[j] + 1;
        const int32_t rc = previous[j - 1] + 1;
        current[j] = ((ic) < (((dc) < (rc) ? (dc) : (rc))) ? (ic) : (((dc) < (rc) ? (dc) : (rc))));
        if ((i > 1 && j > 1 && seq1[i - 2] == seq2[j - 1] && seq1[i - 1] == seq2[j - 2])) {
          const int32_t tc = transpos[j - 2] + 1;
          current[j] = ((tc) < (current[j]) ? (tc) : (current[j]));
        }
      }
    }
    do {
      int32_t *tmp = transpos;
      transpos = previous;
      previous = current;
      current = tmp;
    } while (0);
  }
  return previous[len2];
}
```