parent
67e480971c
commit
404ca36e60
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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_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/Prepare |
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mkdir -p $(PKG_BUILD_DIR)
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$(CP) ./src/* $(PKG_BUILD_DIR)/
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endef |
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define Build/Configure |
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endef |
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define Build/Compile |
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$(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 $(call BuildPackage,maccalc)) |
@ -0,0 +1,14 @@ |
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CC = gcc
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CFLAGS = -Wall
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OBJS = main.o
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all: maccalc |
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%.o: %.c |
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$(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 +1,227 @@ |
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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 <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 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(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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