int fdt_resize()

in EmbeddedPkg/Library/FdtLib/fdt_sw.c [110:140]

• 22 lines of code
• 3 McCabe index (conditional complexity)

int fdt_resize(void *fdt, void *buf, int bufsize)
{
	size_t headsize, tailsize;
	char *oldtail, *newtail;

	FDT_SW_CHECK_HEADER(fdt);

	headsize = fdt_off_dt_struct(fdt);
	tailsize = fdt_size_dt_strings(fdt);

	if ((headsize + tailsize) > bufsize)
		return -FDT_ERR_NOSPACE;

	oldtail = (char *)fdt + fdt_totalsize(fdt) - tailsize;
	newtail = (char *)buf + bufsize - tailsize;

	/* Two cases to avoid clobbering data if the old and new
	 * buffers partially overlap */
	if (buf <= fdt) {
		memmove(buf, fdt, headsize);
		memmove(newtail, oldtail, tailsize);
	} else {
		memmove(newtail, oldtail, tailsize);
		memmove(buf, fdt, headsize);
	}

	fdt_set_off_dt_strings(buf, bufsize);
	fdt_set_totalsize(buf, bufsize);

	return 0;
}