summaryrefslogtreecommitdiff
path: root/common/eeprom/eeprom_field.c
blob: f56eebe679f78c94b1e0e36809ed858242c3d017 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
// 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 <common.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);
}