text: // SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
  /*
   * libfdt - Flat Device Tree manipulation
   * Copyright (C) 2006 David Gibson, IBM Corporation.
   */
  #include "libfdt_env.h"
  
  #include "fdt.h"
  #include "libfdt.h"
  
  #include "libfdt_internal.h"
  
  int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
  					const char *name, int namelen,
  					uint32_t idx, const void *val,
  					int len)
  {
  	void *propval;
  	int proplen;
  
  	propval = fdt_getprop_namelen_w(fdt, nodeoffset, name, namelen,
  					&proplen);
  	if (!propval)
  		return proplen;
  
  	if ((unsigned)proplen < (len + idx))
  		return -FDT_ERR_NOSPACE;
  
  	memcpy((char *)propval + idx, val, len);
  	return 0;
  }
  
  int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
  			const void *val, int len)
  {
  	const void *propval;
  	int proplen;
  
  	propval = fdt_getprop(fdt, nodeoffset, name, &proplen);
  	if (!propval)
  		return proplen;
  
  	if (proplen != len)
  		return -FDT_ERR_NOSPACE;
  
  	return fdt_setprop_inplace_namelen_partial(fdt, nodeoffset, name,
  						   strlen(name), 0,
  						   val, len);
  }
  
  static void fdt_nop_region_(void *start, int len)
  {
  	fdt32_t *p;
  
  	for (p = start; (char *)p < ((char *)start + len); p++)
  		*p = cpu_to_fdt32(FDT_NOP);
  }
  
  int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
  {
  	struct fdt_property *prop;
  	int len;
  
  	prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
  	if (!prop)
  		return len;
  
  	fdt_nop_region_(prop, len + sizeof(*prop));
  
  	return 0;
  }
  
  int fdt_node_end_offset_(void *fdt, int offset)
  {
  	int depth = 0;
  
  	while ((offset >= 0) && (depth >= 0))
  		offset = fdt_next_node(fdt, offset, &depth);
  
  	return offset;
  }
  
  int fdt_nop_node(void *fdt, int nodeoffset)
  {
  	int endoffset;
  
  	endoffset = fdt_node_end_offset_(fdt, nodeoffset);
  	if (endoffset < 0)
  		return endoffset;
  
  	fdt_nop_region_(fdt_offset_ptr_w(fdt, nodeoffset, 0),
  			endoffset - nodeoffset);
  	return 0;
  }
  