user: 请将以下的汇编代码转换成C语言代码:

```asm
<dband>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %edi,%r14d
  mov    %edi,0x14(%rsp)
  mov    %esi,0x28(%rsp)
  mov    %edx,%r13d
  mov    %rcx,%r12
  mov    %r8,%rbp
  mov    %r9,%rbx
  mov    %fs:0x28,%rax
  mov    %rax,0x58(%rsp)
  xor    %eax,%eax
  movl   $0x7c8,0x40(%rsp)
  movl   $0x7c9,0x44(%rsp)
  movl   $0x7ca,0x48(%rsp)
  movl   $0x7cb,0x4c(%rsp)
  lea    D6(%rip),%rdi
  call   <printf@plt>
  mov    %rbx,%r8
  mov    %rbp,%rcx
  mov    %r12,%rdx
  mov    %r13d,%esi
  mov    %r14d,%edi
  call   <dallocateA@plt>
  mov    (%r12),%rax
  mov    %rax,0x30(%rsp)
  mov    0x0(%rbp),%rax
  mov    %rax,0x38(%rsp)
  mov    (%rbx),%rax
  mov    %rax,0x18(%rsp)
  lea    0x40(%rsp),%rdx
  lea    0x50(%rsp),%rsi
L23:
  mov    (%rdx),%ecx
  mov    %ecx,%eax
  neg    %eax
  cmovs  %ecx,%eax
  and    $0xfff,%eax
  mov    %eax,(%rdx)
  add    $0x4,%rdx
  cmp    %rsi,%rdx
  jne    L23
  mov    0x4c(%rsp),%edx
  mov    %edx,%ecx
  shr    $0x1f,%ecx
  lea    (%rdx,%rcx,1),%eax
  and    $0x1,%eax
  sub    %ecx,%eax
  cmp    $0x1,%eax
  je     L22
  add    $0x1,%edx
  mov    %edx,0x4c(%rsp)
L22:
  mov    0x14(%rsp),%eax
  test   %eax,%eax
  jle    L1
  mov    %eax,%esi
  mov    %rsi,0x20(%rsp)
  movq   $0x0,0x8(%rsp)
  movl   $0x0,0x10(%rsp)
  sub    $0x1,%eax
  mov    %eax,0x2c(%rsp)
  jmp    L8
L56:
  sub    %r15d,%ebp
  mov    0x10(%rsp),%eax
  lea    0x1(%rax,%rbp,1),%eax
  mov    %eax,0x10(%rsp)
  addq   $0x1,0x8(%rsp)
  mov    0x8(%rsp),%rax
  cmp    0x20(%rsp),%rax
  je     L39
L8:
  mov    0x18(%rsp),%rcx
  mov    0x8(%rsp),%rsi
  mov    0x10(%rsp),%eax
  mov    %eax,(%rcx,%rsi,4)
  cltq
  mov    %esi,%r15d
  mov    0x28(%rsp),%ecx
  sub    %ecx,%r15d
  mov    $0x0,%edx
  cmovs  %edx,%r15d
  add    %esi,%ecx
  mov    %ecx,%ebp
  cmp    %ecx,0x14(%rsp)
  cmovle 0x2c(%rsp),%ebp
  cmp    %r15d,%ebp
  jl     L56
  movslq %r15d,%rbx
  mov    %rax,%rdx
  sub    %rbx,%rdx
  mov    0x30(%rsp),%rcx
  lea    (%rcx,%rdx,8),%r14
  mov    0x38(%rsp),%rdi
  lea    (%rdi,%rdx,4),%r13
  lea    0x40(%rsp),%r12
L2:
  mov    %r12,%rdi
  mov    $0x0,%eax
  call   <dlaran_@plt>
  movsd  %xmm0,(%r14,%rbx,8)
  mov    %ebx,0x0(%r13,%rbx,4)
  add    $0x1,%rbx
  cmp    %ebx,%ebp
  jge    L2
  jmp    L56
L1:
  movl   $0x0,0x10(%rsp)
L39:
  movslq 0x14(%rsp),%rax
  mov    0x18(%rsp),%rsi
  mov    0x10(%rsp),%edx
  mov    %edx,(%rsi,%rax,4)
  mov    0x58(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L89
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L89:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: data_tag: D6
type: string

tool: D6: A banded matrix.

assistant: ```c
void dband(int n, int b, int nonz, double **nzval, int **rowind, int **colptr) {
  int iseed[] = {1992, 1993, 1994, 1995};
  register int i, j, ub, lb, ilow, ihigh, lasta = 0;
  double *a;
  int *asub, *xa;
  double *val;
  int *row;
  extern double dlaran_();
  printf("A banded matrix.");
  dallocateA(n, nonz, nzval, rowind, colptr);
  a = *nzval;
  asub = *rowind;
  xa = *colptr;
  ub = lb = b;
  for (i = 0; i < 4; ++i)
    iseed[i] = abs(iseed[i]) % 4096;
  if (iseed[3] % 2 != 1)
    ++iseed[3];
  for (j = 0; j < n; ++j) {
    xa[j] = lasta;
    val = &a[lasta];
    row = &asub[lasta];
    ilow = ((0) > (j - ub) ? (0) : (j - ub));
    ihigh = ((n - 1) < (j + lb) ? (n - 1) : (j + lb));
    for (i = ilow; i <= ihigh; ++i) {
      val[i - ilow] = dlaran_(iseed);
      row[i - ilow] = i;
    }
    lasta += ihigh - ilow + 1;
  }
  xa[n] = lasta;
}
```