// File: /workspace/github_c_makefile_star2_O3/genometools[P]genometools/src/external/sqlite-3.33.0/sqlite3.c
// Function: clearCell
static int clearCell(
  MemPage *pPage,          /* The page that contains the Cell */
  unsigned char *pCell,    /* First byte of the Cell */
  CellInfo *pInfo          /* Size information about the cell */
){
  BtShared *pBt;
  Pgno ovflPgno;
  int rc;
  int nOvfl;
  u32 ovflPageSize;

  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
  pPage->xParseCell(pPage, pCell, pInfo);
  if( pInfo->nLocal==pInfo->nPayload ){
    return SQLITE_OK;  /* No overflow pages. Return without doing anything */
  }
  testcase( pCell + pInfo->nSize == pPage->aDataEnd );
  testcase( pCell + (pInfo->nSize-1) == pPage->aDataEnd );
  if( pCell + pInfo->nSize > pPage->aDataEnd ){
    /* Cell extends past end of page */
    return SQLITE_CORRUPT_PAGE(pPage);
  }
  ovflPgno = get4byte(pCell + pInfo->nSize - 4);
  pBt = pPage->pBt;
  assert( pBt->usableSize > 4 );
  ovflPageSize = pBt->usableSize - 4;
  nOvfl = (pInfo->nPayload - pInfo->nLocal + ovflPageSize - 1)/ovflPageSize;
  assert( nOvfl>0 ||
    (CORRUPT_DB && (pInfo->nPayload + ovflPageSize)<ovflPageSize)
  );
  while( nOvfl-- ){
    Pgno iNext = 0;
    MemPage *pOvfl = 0;
    if( ovflPgno<2 || ovflPgno>btreePagecount(pBt) ){
      /* 0 is not a legal page number and page 1 cannot be an
      ** overflow page. Therefore if ovflPgno<2 or past the end of the
      ** file the database must be corrupt. */
      return SQLITE_CORRUPT_BKPT;
    }
    if( nOvfl ){
      rc = getOverflowPage(pBt, ovflPgno, &pOvfl, &iNext);
      if( rc ) return rc;
    }

    if( ( pOvfl || ((pOvfl = btreePageLookup(pBt, ovflPgno))!=0) )
     && sqlite3PagerPageRefcount(pOvfl->pDbPage)!=1
    ){
      /* There is no reason any cursor should have an outstanding reference
      ** to an overflow page belonging to a cell that is being deleted/updated.
      ** So if there exists more than one reference to this page, then it
      ** must not really be an overflow page and the database must be corrupt.
      ** It is helpful to detect this before calling freePage2(), as
      ** freePage2() may zero the page contents if secure-delete mode is
      ** enabled. If this 'overflow' page happens to be a page that the
      ** caller is iterating through or using in some other way, this
      ** can be problematic.
      */
      rc = SQLITE_CORRUPT_BKPT;
    }else{
      rc = freePage2(pBt, pOvfl, ovflPgno);
    }

    if( pOvfl ){
      sqlite3PagerUnref(pOvfl->pDbPage);
    }
    if( rc ) return rc;
    ovflPgno = iNext;
  }
  return SQLITE_OK;
}

// Assembly:
pushq %rbp
pushq %r15
pushq %r14
pushq %r13
pushq %r12
pushq %rbx
subq $0x18, %rsp
movq %rdx, %r12
movq %rsi, %r14
movq %rdi, %rbx
callq *0x80(%rdi)
movzwl 0x14(%r12), %ecx
movl 0x10(%r12), %eax
xorl %r15d, %r15d
cmpl %ecx, %eax
je 0x29f845
movzwl 0x16(%r12), %edx
addq %rdx, %r14
cmpq 0x58(%rbx), %r14
jbe 0x29f833
leaq 0x1363bf(%rip), %rsi    # 0x3d5bcb
leaq 0x1364c9(%rip), %rdx    # 0x3d5cdc
leaq 0x136217(%rip), %r8     # 0x3d5a31
movl $0xb, %r15d
movl $0xb, %edi
movl $0x114e1, %ecx          # imm = 0x114E1
xorl %eax, %eax
callq 0x274d08
jmp 0x29f845
movq 0x48(%rbx), %rbx
movl 0x38(%rbx), %esi
addl $-0x4, %esi
notl %ecx
addl %ecx, %eax
addl %esi, %eax
jae 0x29f857
movl %r15d, %eax
addq $0x18, %rsp
popq %rbx
popq %r12
popq %r13
popq %r14
popq %r15
popq %rbp
retq
xorl %edx, %edx
divl %esi
movl %eax, %ebp
movl -0x4(%r14), %r12d
bswapl %r12d
leaq 0x10(%rsp), %r13
leaq 0xc(%rsp), %r14
movl $0x0, 0xc(%rsp)
movq $0x0, 0x10(%rsp)
cmpl $0x2, %r12d
jb 0x29f951
cmpl 0x40(%rbx), %r12d
ja 0x29f951
decl %ebp
je 0x29f8ba
movq %rbx, %rdi
movl %r12d, %esi
movq %r13, %rdx
movq %r14, %rcx
callq 0x28e55a
testl %eax, %eax
jne 0x29f97b
movq 0x10(%rsp), %rsi
testq %rsi, %rsi
jne 0x29f8d2
movq %rbx, %rdi
movl %r12d, %esi
callq 0x29f983
movq %rax, %rsi
movq %rax, 0x10(%rsp)
testq %rax, %rax
je 0x29f90b
movq 0x70(%rsi), %rax
cmpw $0x1, 0x36(%rax)
je 0x29f90d
movl $0xb, %r15d
movl $0xb, %edi
leaq 0x1362dc(%rip), %rsi    # 0x3d5bcb
leaq 0x1363e6(%rip), %rdx    # 0x3d5cdc
movl $0x11506, %ecx          # imm = 0x11506
leaq 0x13612f(%rip), %r8     # 0x3d5a31
xorl %eax, %eax
callq 0x274d08
jmp 0x29f91b
xorl %esi, %esi
movq %rbx, %rdi
movl %r12d, %edx
callq 0x29f9d4
movl %eax, %r15d
movq 0x10(%rsp), %rax
testq %rax, %rax
je 0x29f933
movq 0x70(%rax), %rdi
testq %rdi, %rdi
je 0x29f933
callq 0x28ab87
testl %r15d, %r15d
jne 0x29f845
movl 0xc(%rsp), %r12d
xorl %r15d, %r15d
testl %ebp, %ebp
jne 0x29f86e
jmp 0x29f845
leaq 0x136273(%rip), %rsi    # 0x3d5bcb
leaq 0x13637d(%rip), %rdx    # 0x3d5cdc
leaq 0x1360cb(%rip), %r8     # 0x3d5a31
movl $0xb, %r15d
movl $0xb, %edi
movl $0x114f2, %ecx          # imm = 0x114F2
jmp 0x29f82a
movl %eax, %r15d
jmp 0x29f845