maccalc: import from base
This is a helpful utility, but it does not have any dependencies in base repository. Move it to packages feed. Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
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#
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# Copyright (C) 2011 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk
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PKG_NAME:=maccalc
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PKG_RELEASE:=1
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PKG_LICENSE:=GPL-2.0
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PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
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include $(INCLUDE_DIR)/package.mk
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define Package/maccalc
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SECTION:=utils
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CATEGORY:=Utilities
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TITLE:=MAC address calculation
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endef
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define Package/maccalc/description
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This package contains a MAC address manipulation utility.
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endef
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define Build/Configure
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endef
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define Build/Compile
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$(MAKE) -C $(PKG_BUILD_DIR) \
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CC="$(TARGET_CC)" \
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CFLAGS="$(TARGET_CFLAGS) -Wall" \
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LDFLAGS="$(TARGET_LDFLAGS)"
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endef
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define Package/maccalc/install
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$(INSTALL_DIR) $(1)/usr/sbin
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$(INSTALL_BIN) $(PKG_BUILD_DIR)/maccalc $(1)/usr/sbin/
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endef
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$(eval $(call BuildPackage,maccalc))
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@ -0,0 +1,14 @@
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CC = gcc
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CFLAGS = -Wall
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OBJS = main.o
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all: maccalc
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%.o: %.c
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$(CC) $(CFLAGS) -c -o $@ $<
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maccalc: $(OBJS)
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$(CC) -o $@ $(OBJS)
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clean:
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rm -f maccalc *.o
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@ -0,0 +1,256 @@
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/*
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* MAC address manupulation utility
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*
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* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#define MAC_ADDRESS_LEN 6
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#define ERR_INVALID 1
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#define ERR_IO 2
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static void usage(void);
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char *maccalc_name;
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static int parse_mac(const char *mac_str, unsigned char *buf)
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{
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int t;
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t = sscanf(mac_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
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&buf[0], &buf[1], &buf[2], &buf[3], &buf[4], &buf[5]);
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if (t != MAC_ADDRESS_LEN)
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return ERR_INVALID;
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return 0;
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}
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static void print_mac(unsigned char *buf)
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{
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printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
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buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
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}
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static int maccalc_do_add(int argc, const char *argv[])
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{
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unsigned char mac[MAC_ADDRESS_LEN];
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uint32_t t;
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int err;
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int i;
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if (argc != 2) {
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usage();
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return ERR_INVALID;
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}
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err = parse_mac(argv[0], mac);
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if (err)
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return err;
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i = atoi(argv[1]);
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t = (mac[3] << 16) | (mac[4] << 8) | mac[5];
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t += i;
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mac[3] = (t >> 16) & 0xff;
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mac[4] = (t >> 8) & 0xff;
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mac[5] = t & 0xff;
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print_mac(mac);
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return 0;
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}
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static int maccalc_do_logical(int argc, const char *argv[],
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unsigned char (*op)(unsigned char n1,
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unsigned char n2))
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{
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unsigned char mac1[MAC_ADDRESS_LEN];
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unsigned char mac2[MAC_ADDRESS_LEN];
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int err;
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int i;
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if (argc != 2) {
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usage();
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return ERR_INVALID;
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}
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err = parse_mac(argv[0], mac1);
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if (err)
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return err;
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err = parse_mac(argv[1], mac2);
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if (err)
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return err;
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for (i = 0; i < MAC_ADDRESS_LEN; i++)
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mac1[i] = op(mac1[i],mac2[i]);
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print_mac(mac1);
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return 0;
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}
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static int maccalc_do_mac2bin(int argc, const char *argv[])
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{
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unsigned char mac[MAC_ADDRESS_LEN];
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ssize_t c;
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int err;
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if (argc != 1) {
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usage();
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return ERR_INVALID;
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}
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err = parse_mac(argv[0], mac);
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if (err)
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return err;
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c = write(STDOUT_FILENO, mac, sizeof(mac));
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if (c != sizeof(mac)) {
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fprintf(stderr, "failed to write to stdout\n");
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return ERR_IO;
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}
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return 0;
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}
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static ssize_t read_safe(int fd, void *buf, size_t count)
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{
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ssize_t total = 0;
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ssize_t r;
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while(count > 0) {
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r = read(fd, buf, count);
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if (r == 0)
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/* EOF */
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break;
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if (r < 0) {
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if (errno == EINTR)
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/* interrupted by a signal, restart */
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continue;
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/* error */
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total = -1;
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break;
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}
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/* ok */
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total += r;
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count -= r;
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buf += r;
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}
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return total;
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}
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static int maccalc_do_bin2mac(int argc, const char *argv[])
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{
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unsigned char mac[MAC_ADDRESS_LEN];
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ssize_t c;
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if (argc != 0) {
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usage();
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return ERR_INVALID;
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}
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c = read_safe(STDIN_FILENO, mac, sizeof(mac));
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if (c != sizeof(mac)) {
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fprintf(stderr, "failed to read from stdin\n");
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return ERR_IO;
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}
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print_mac(mac);
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return 0;
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}
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static unsigned char op_or(unsigned char n1, unsigned char n2)
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{
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return n1 | n2;
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}
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static int maccalc_do_or(int argc, const char *argv[])
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{
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return maccalc_do_logical(argc, argv, op_or);
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}
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static unsigned char op_and(unsigned char n1, unsigned char n2)
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{
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return n1 & n2;
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}
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static int maccalc_do_and(int argc, const char *argv[])
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{
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return maccalc_do_logical(argc, argv, op_and);
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}
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static unsigned char op_xor(unsigned char n1, unsigned char n2)
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{
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return n1 ^ n2;
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}
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static int maccalc_do_xor(int argc, const char *argv[])
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{
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return maccalc_do_logical(argc, argv, op_xor);
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}
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static void usage(void)
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{
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fprintf(stderr,
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"Usage: %s <command>\n"
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"valid commands:\n"
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" add <mac> <number>\n"
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" and|or|xor <mac1> <mac2>\n"
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" mac2bin <mac>\n"
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" bin2mac\n",
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maccalc_name);
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}
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int main(int argc, const char *argv[])
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{
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int (*op)(int argc, const char *argv[]);
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int ret;
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maccalc_name = (char *) argv[0];
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if (argc < 2) {
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usage();
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return EXIT_FAILURE;
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}
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if (strcmp(argv[1], "add") == 0) {
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op = maccalc_do_add;
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} else if (strcmp(argv[1], "and") == 0) {
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op = maccalc_do_and;
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} else if (strcmp(argv[1], "or") == 0) {
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op = maccalc_do_or;
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} else if (strcmp(argv[1], "xor") == 0) {
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op = maccalc_do_xor;
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} else if (strcmp(argv[1], "mac2bin") == 0) {
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op = maccalc_do_mac2bin;
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} else if (strcmp(argv[1], "bin2mac") == 0) {
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op = maccalc_do_bin2mac;
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} else {
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fprintf(stderr, "unknown command '%s'\n", argv[1]);
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usage();
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return EXIT_FAILURE;
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}
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argc -= 2;
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argv += 2;
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ret = op(argc, argv);
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if (ret)
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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}
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