static int overlay_fixup_phandle()

in EmbeddedPkg/Library/FdtLib/fdt_overlay.c [474:537]

• 52 lines of code
• 14 McCabe index (conditional complexity)

static int overlay_fixup_phandle(void *fdt, void *fdto, int symbols_off,
				 int property)
{
	const char *value;
	const char *label;
	int len;

	value = fdt_getprop_by_offset(fdto, property,
				      &label, &len);
	if (!value) {
		if (len == -FDT_ERR_NOTFOUND)
			return -FDT_ERR_INTERNAL;

		return len;
	}

	do {
		const char *path, *name, *fixup_end;
		const char *fixup_str = value;
		uint32_t path_len, name_len;
		uint32_t fixup_len;
		char *sep, *endptr;
		int poffset, ret;

		fixup_end = memchr(value, '\0', len);
		if (!fixup_end)
			return -FDT_ERR_BADOVERLAY;
		fixup_len = fixup_end - fixup_str;

		len -= fixup_len + 1;
		value += fixup_len + 1;

		path = fixup_str;
		sep = memchr(fixup_str, ':', fixup_len);
		if (!sep || *sep != ':')
			return -FDT_ERR_BADOVERLAY;

		path_len = sep - path;
		if (path_len == (fixup_len - 1))
			return -FDT_ERR_BADOVERLAY;

		fixup_len -= path_len + 1;
		name = sep + 1;
		sep = memchr(name, ':', fixup_len);
		if (!sep || *sep != ':')
			return -FDT_ERR_BADOVERLAY;

		name_len = sep - name;
		if (!name_len)
			return -FDT_ERR_BADOVERLAY;

		poffset = strtoul(sep + 1, &endptr, 10);
		if ((*endptr != '\0') || (endptr <= (sep + 1)))
			return -FDT_ERR_BADOVERLAY;

		ret = overlay_fixup_one_phandle(fdt, fdto, symbols_off,
						path, path_len, name, name_len,
						poffset, label);
		if (ret)
			return ret;
	} while (len > 0);

	return 0;
}