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c25f01a63a
This patch adds a little tool that takes a generic MAC address and generates a CRC byte for it. The output is the full MAC address without any separators, ready written into an EEPROM. Signed-off-by: Olliver Schinagl <o.schinagl@ultimaker.com> Signed-off-by: Olliver Schinagl <oliver@schinagl.nl> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
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* (C) Copyright 2016
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* Olliver Schinagl <oliver@schinagl.nl>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <ctype.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <u-boot/crc.h>
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#define ARP_HLEN 6 /* Length of hardware address */
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#define ARP_HLEN_ASCII (ARP_HLEN * 2) + (ARP_HLEN - 1) /* with separators */
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#define ARP_HLEN_LAZY (ARP_HLEN * 2) /* separatorless hardware address length */
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uint8_t nibble_to_hex(const char *nibble, bool lo)
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{
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return (strtol(nibble, NULL, 16) << (lo ? 0 : 4)) & (lo ? 0x0f : 0xf0);
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}
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int process_mac(const char *mac_address)
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{
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uint8_t ethaddr[ARP_HLEN + 1] = { 0x00 };
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uint_fast8_t i = 0;
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while (*mac_address != '\0') {
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char nibble[2] = { 0x00, '\n' }; /* for strtol */
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nibble[0] = *mac_address++;
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if (isxdigit(nibble[0])) {
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if (isupper(nibble[0]))
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nibble[0] = tolower(nibble[0]);
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ethaddr[i >> 1] |= nibble_to_hex(nibble, (i % 2) != 0);
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i++;
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}
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}
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for (i = 0; i < ARP_HLEN; i++)
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printf("%.2x", ethaddr[i]);
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printf("%.2x\n", crc8(0, ethaddr, ARP_HLEN));
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return 0;
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}
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void print_usage(char *cmdname)
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{
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printf("Usage: %s <mac_address>\n", cmdname);
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puts("<mac_address> may be with or without separators.");
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puts("Valid seperators are ':' and '-'.");
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puts("<mac_address> digits are in base 16.\n");
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}
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int main(int argc, char *argv[])
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{
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if (argc < 2) {
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print_usage(argv[0]);
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return 1;
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}
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if (!((strlen(argv[1]) == ARP_HLEN_ASCII) || (strlen(argv[1]) == ARP_HLEN_LAZY))) {
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puts("The MAC address is not valid.\n");
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print_usage(argv[0]);
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return 1;
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}
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if (process_mac(argv[1])) {
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puts("Failed to calculate the MAC's checksum.");
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return 1;
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}
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return 0;
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}
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