a3xelte: add Kernel Commandline Helper

obj-$(CONFIG_OF_PROMTREE) += pdt.o

obj-$(CONFIG_OF_ADDRESS)  += address.o

obj-$(CONFIG_OF_IRQ)    += irq.o

obj-y += cmdline_helper.o

obj-$(CONFIG_OF_DEVICE) += device.o platform.o

obj-$(CONFIG_OF_I2C)	+= of_i2c.o

obj-$(CONFIG_OF_NET)	+= of_net.o

/*

 * Copyright 2016 Jesse Chan <cjx123@outlook.com>

 *

 * This file is part of the Linux kernel and is made available under

 * the terms of the GNU General Public License, version 2, or at your

 * option, any later version, incorporated herein by reference.

 */

#include <linux/string.h>

#include <linux/cmdline_helper.h>

#include <asm/setup.h>

char* add_cmdline(char* original_cmdline, char* cmdline_to_be_add)

{

	static char new_command_line[COMMAND_LINE_SIZE];

	char *cmd = new_command_line;

	strcpy(cmd, original_cmdline);

	strcat(cmd, " ");

	strcat(cmd, cmdline_to_be_add);

	return new_command_line;

}

char* del_cmdline(char* original_cmdline, char* cmdline_to_be_del)

{

	static char new_command_line[COMMAND_LINE_SIZE];

	char *offset_addr, *cmd = new_command_line;

	strcpy(cmd, original_cmdline);

	offset_addr = strstr(cmd, cmdline_to_be_del);

	if (offset_addr) {

		size_t i, len, offset;

		len = strlen(cmd);

		offset = offset_addr - cmd;

		for (i = 1; i < (len - offset); i++) {

			if (cmd[offset + i] == ' ')

				break;

		}

		memmove(offset_addr, &cmd[offset + i + 1], len - i - offset);

	}

	return new_command_line;

}

/*

 * Copyright 2016 Jesse Chan <cjx123@outlook.com>

 *

 * This file is part of the Linux kernel and is made available under

 * the terms of the GNU General Public License, version 2, or at your

 * option, any later version, incorporated herein by reference.

 */

#ifndef _LINUX_CMDLINE_HELPER_H

#define _LINUX_CMDLINE_HELPER_H

extern char* add_cmdline(char* original_cmdline, char* cmdline_to_be_add);

extern char* del_cmdline(char* original_cmdline, char* cmdline_to_be_del);

#endif  /*_LINUX_CMDLINE_HELPER_H*/