[RFC 06/10] lib: add ubiutils-common

[Wolfram Sang]

Imported from mtd-utils and stripped down to needed functionality for
ubiformat.

Signed-off-by: Wolfram Sang <w.sang at pengutronix.de>
---
 include/mtd/ubiutils-common.h |   26 +++++++++
 lib/Kconfig                   |    3 +
 lib/Makefile                  |    1 +
 lib/ubiutils-common.c         |  122 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 152 insertions(+)
 create mode 100644 include/mtd/ubiutils-common.h
 create mode 100644 lib/ubiutils-common.c

diff --git a/include/mtd/ubiutils-common.h b/include/mtd/ubiutils-common.h
new file mode 100644
index 0000000..3a16617
--- /dev/null
+++ b/include/mtd/ubiutils-common.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) Artem Bityutskiy, 2007, 2008
+ *
+ * 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.
+ */
+
+#ifndef __UBI_UTILS_COMMON_H__
+#define __UBI_UTILS_COMMON_H__
+
+long long ubiutils_get_bytes(const char *str);
+void ubiutils_print_bytes(long long bytes, int bracket);
+
+#endif /* !__UBI_UTILS_COMMON_H__ */
+
diff --git a/lib/Kconfig b/lib/Kconfig
index 9882d2d..fd7a1f9 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -38,6 +38,9 @@ config BITREV
 config QSORT
 	bool
 
+config UBIUTILS
+	bool
+
 source lib/gui/Kconfig
 
 endmenu
diff --git a/lib/Makefile b/lib/Makefile
index 41e6a0f..68404d1 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -34,4 +34,5 @@ obj-$(CONFIG_UNCOMPRESS)	+= uncompress.o
 obj-$(CONFIG_BCH)	+= bch.o
 obj-$(CONFIG_BITREV)	+= bitrev.o
 obj-$(CONFIG_QSORT)	+= qsort.o
+obj-$(CONFIG_UBIUTILS)	+= ubiutils-common.o
 obj-y			+= gui/
diff --git a/lib/ubiutils-common.c b/lib/ubiutils-common.c
new file mode 100644
index 0000000..d01e723
--- /dev/null
+++ b/lib/ubiutils-common.c
@@ -0,0 +1,122 @@
+/*
+ * 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 <common.h>
+#include <stdlib.h>
+#include <string.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 = simple_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%lld GiB", p, bytes / (1024 * 1024 * 1024));
+	else if (bytes > 1024 * 1024)
+		printf("%s%lld MiB", p, bytes / (1024 * 1024));
+	else if (bytes > 1024 && bytes != 0)
+		printf("%s%lld KiB", p, bytes / 1024);
+	else
+		return;
+
+	if (bracket)
+		printf(")");
+}
-- 
1.7.10.4