blob: 3bacb1ae7eb79a20d94714ffdc20348c46de0356 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2009-2016 CompuLab, Ltd.
*
* Authors: Nikita Kiryanov <nikita@compulab.co.il>
* Igor Grinberg <grinberg@compulab.co.il>
*/
#include <stdio.h>
#include <vsprintf.h>
#include <linux/string.h>
#include <eeprom_field.h>
static void __eeprom_field_print_bin(const struct eeprom_field *field,
char *delimiter, bool reverse)
{
int i;
int from = reverse ? field->size - 1 : 0;
int to = reverse ? 0 : field->size - 1;
printf(PRINT_FIELD_SEGMENT, field->name);
for (i = from; i != to; reverse ? i-- : i++)
printf("%02x%s", field->buf[i], delimiter);
printf("%02x\n", field->buf[i]);
}
static int __eeprom_field_update_bin(struct eeprom_field *field,
const char *value, bool reverse)
{
int len = strlen(value);
int k, j, i = reverse ? len - 1 : 0;
unsigned char byte;
char *endptr;
/* each two characters in the string fit in one byte */
if (len > field->size * 2)
return -1;
memset(field->buf, 0, field->size);
/* i - string iterator, j - buf iterator */
for (j = 0; j < field->size; j++) {
byte = 0;
char tmp[3] = { 0, 0, 0 };
if ((reverse && i < 0) || (!reverse && i >= len))
break;
for (k = 0; k < 2; k++) {
if (reverse && i == 0) {
tmp[k] = value[i];
break;
}
tmp[k] = value[reverse ? i - 1 + k : i + k];
}
byte = simple_strtoul(tmp, &endptr, 0);
if (*endptr != '\0' || byte < 0)
return -1;
field->buf[j] = byte;
i = reverse ? i - 2 : i + 2;
}
return 0;
}
static int __eeprom_field_update_bin_delim(struct eeprom_field *field,
char *value, char *delimiter)
{
int count = 0;
int i, val;
const char *tmp = value;
char *tok;
char *endptr;
tmp = strstr(tmp, delimiter);
while (tmp != NULL) {
count++;
tmp++;
tmp = strstr(tmp, delimiter);
}
if (count > field->size)
return -1;
tok = strtok(value, delimiter);
for (i = 0; tok && i < field->size; i++) {
val = simple_strtoul(tok, &endptr, 0);
if (*endptr != '\0')
return -1;
/* here we assume that each tok is no more than byte long */
field->buf[i] = (unsigned char)val;
tok = strtok(NULL, delimiter);
}
return 0;
}
/**
* eeprom_field_print_bin() - print a field which contains binary data
*
* Treat the field data as simple binary data, and print it as two digit
* hexadecimal values.
* Sample output:
* Field Name 0102030405060708090a
*
* @field: an initialized field to print
*/
void eeprom_field_print_bin(const struct eeprom_field *field)
{
__eeprom_field_print_bin(field, "", false);
}
/**
* eeprom_field_update_bin() - Update field with new data in binary form
*
* @field: an initialized field
* @value: a string of values (i.e. "10b234a")
*/
int eeprom_field_update_bin(struct eeprom_field *field, char *value)
{
return __eeprom_field_update_bin(field, value, false);
}
/**
* eeprom_field_update_reserved() - Update reserved field with new data in
* binary form
*
* @field: an initialized field
* @value: a space delimited string of byte values (i.e. "1 02 3 0x4")
*/
int eeprom_field_update_reserved(struct eeprom_field *field, char *value)
{
return __eeprom_field_update_bin_delim(field, value, " ");
}
/**
* eeprom_field_print_bin_rev() - print a field which contains binary data in
* reverse order
*
* Treat the field data as simple binary data, and print it in reverse order
* as two digit hexadecimal values.
*
* Data in field:
* 0102030405060708090a
* Sample output:
* Field Name 0a090807060504030201
*
* @field: an initialized field to print
*/
void eeprom_field_print_bin_rev(const struct eeprom_field *field)
{
__eeprom_field_print_bin(field, "", true);
}
/**
* eeprom_field_update_bin_rev() - Update field with new data in binary form,
* storing it in reverse
*
* This function takes a string of byte values, and stores them
* in the field in the reverse order. i.e. if the input string was "1234",
* "3412" will be written to the field.
*
* @field: an initialized field
* @value: a string of byte values
*/
int eeprom_field_update_bin_rev(struct eeprom_field *field, char *value)
{
return __eeprom_field_update_bin(field, value, true);
}
/**
* eeprom_field_print_mac_addr() - print a field which contains a mac address
*
* Treat the field data as simple binary data, and print it formatted as a MAC
* address.
* Sample output:
* Field Name 01:02:03:04:05:06
*
* @field: an initialized field to print
*/
void eeprom_field_print_mac(const struct eeprom_field *field)
{
__eeprom_field_print_bin(field, ":", false);
}
/**
* eeprom_field_update_mac() - Update a mac address field which contains binary
* data
*
* @field: an initialized field
* @value: a colon delimited string of byte values (i.e. "1:02:3:ff")
*/
int eeprom_field_update_mac(struct eeprom_field *field, char *value)
{
return __eeprom_field_update_bin_delim(field, value, ":");
}
/**
* eeprom_field_print_ascii() - print a field which contains ASCII data
* @field: an initialized field to print
*/
void eeprom_field_print_ascii(const struct eeprom_field *field)
{
char format[8];
sprintf(format, "%%.%ds\n", field->size);
printf(PRINT_FIELD_SEGMENT, field->name);
printf(format, field->buf);
}
/**
* eeprom_field_update_ascii() - Update field with new data in ASCII form
* @field: an initialized field
* @value: the new string data
*
* Returns 0 on success, -1 of failure (new string too long).
*/
int eeprom_field_update_ascii(struct eeprom_field *field, char *value)
{
if (strlen(value) >= field->size) {
printf("%s: new data too long\n", field->name);
return -1;
}
strncpy((char *)field->buf, value, field->size - 1);
field->buf[field->size - 1] = '\0';
return 0;
}
/**
* eeprom_field_print_reserved() - print the "Reserved fields" field
*
* Print a notice that the following field_size bytes are reserved.
*
* Sample output:
* Reserved fields (64 bytes)
*
* @field: an initialized field to print
*/
void eeprom_field_print_reserved(const struct eeprom_field *field)
{
printf(PRINT_FIELD_SEGMENT, "Reserved fields\t");
printf("(%d bytes)\n", field->size);
}