aboutsummaryrefslogtreecommitdiff
path: root/ubi-utils/src/common.c
blob: 3fd470b6c011adf3279db5b9b75f492f8f4370cb (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
/*
 * Copyright (C) 2007, 2008 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
 * the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * This file contains various common stuff used by UBI utilities.
 *
 * Authors: Artem Bityutskiy
 *          Adrian Hunter
 */

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include "common.h"

/**
 * get_multiplier - convert size specifier to an integer multiplier.
 * @str: the size specifier string
 *
 * This function parses the @str size specifier, which may be one of
 * 'KiB', 'MiB', or 'GiB' into an integer multiplier. Returns positive
 * size multiplier in case of success and %-1 in case of failure.
 */
static int get_multiplier(const char *str)
{
	if (!str)
		return 1;

	/* Remove spaces before the specifier */
	while (*str == ' ' || *str == '\t')
		str += 1;

	if (!strcmp(str, "KiB"))
		return 1024;
	if (!strcmp(str, "MiB"))
		return 1024 * 1024;
	if (!strcmp(str, "GiB"))
		return 1024 * 1024 * 1024;

	return -1;
}

/**
 * ubiutils_get_bytes - convert a string containing amount of bytes into an
 * integer
 * @str: string to convert
 *
 * This function parses @str which may have one of 'KiB', 'MiB', or 'GiB'
 * size specifiers. Returns positive amount of bytes in case of success and %-1
 * in case of failure.
 */
long long ubiutils_get_bytes(const char *str)
{
	char *endp;
	long long bytes = strtoull(str, &endp, 0);

	if (endp == str || bytes < 0) {
		fprintf(stderr, "incorrect amount of bytes: \"%s\"\n", str);
		return -1;
	}

	if (*endp != '\0') {
		int mult = get_multiplier(endp);

		if (mult == -1) {
			fprintf(stderr, "bad size specifier: \"%s\" - "
			        "should be 'KiB', 'MiB' or 'GiB'\n", endp);
			return -1;
		}
		bytes *= mult;
	}

	return bytes;
}

/**
 * ubiutils_print_bytes - print bytes.
 * @bytes: variable to print
 * @bracket: whether brackets have to be put or not
 *
 * This is a helper function which prints amount of bytes in a human-readable
 * form, i.e., it prints the exact amount of bytes following by the approximate
 * amount of Kilobytes, Megabytes, or Gigabytes, depending on how big @bytes
 * is.
 */
void ubiutils_print_bytes(long long bytes, int bracket)
{
	const char *p;

	if (bracket)
		p = " (";
	else
		p = ", ";

	printf("%lld bytes", bytes);

	if (bytes > 1024 * 1024 * 1024)
		printf("%s%.1f GiB", p, (double)bytes / (1024 * 1024 * 1024));
	else if (bytes > 1024 * 1024)
		printf("%s%.1f MiB", p, (double)bytes / (1024 * 1024));
	else if (bytes > 1024 && bytes != 0)
		printf("%s%.1f KiB", p, (double)bytes / 1024);
	else
		return;

	if (bracket)
		printf(")");
}

/**
 * ubiutils_print_text - print text and fold it.
 * @stream: file stream to print to
 * @text: text to print
 * @width: maximum allowed text width
 *
 * Print text and fold it so that each line would not have more then @width
 * characters.
 */
void ubiutils_print_text(FILE *stream, const char *text, int width)
{
	int pos, bpos = 0;
	const char *p;
	char line[1024];

	if (width > 1023) {
		fprintf(stream, "%s\n", text);
		return;
	}
	p = text;
	pos = 0;
	while (p[pos]) {
		while (!isspace(p[pos])) {
			line[pos] = p[pos];
			if (!p[pos])
				break;
			++pos;
			if (pos == width) {
				line[pos] = '\0';
				fprintf(stream, "%s\n", line);
				p += pos;
				pos = 0;
			}
		}
		while (pos < width) {
			line[pos] = p[pos];
			if (!p[pos]) {
				bpos = pos;
				break;
			}
			if (isspace(p[pos]))
				bpos = pos;
			++pos;
		}
		line[bpos] = '\0';
		fprintf(stream, "%s\n", line);
		p += bpos;
		pos = 0;
		while (p[pos] && isspace(p[pos]))
			++p;
	}
}