1 files changed, 91 insertions, 0 deletions
diff --git a/lib/e2p/parse_num.c b/lib/e2p/parse_num.c
new file mode 100644
index 0000000..e8d6283
--- /dev/null
+++ b/lib/e2p/parse_num.c
@@ -0,0 +1,91 @@
+/*
+ * parse_num.c		- Parse the number of blocks
+ *
+ * Copyright (C) 2004,2005  Theodore Ts'o <tytso@mit.edu>
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include "e2p.h"
+
+#include <stdlib.h>
+
+unsigned long long parse_num_blocks2(const char *arg, int log_block_size)
+{
+	char *p;
+	unsigned long long num;
+
+	num = strtoull(arg, &p, 0);
+
+	if (p[0] && p[1])
+		return 0;
+
+	switch (*p) {		/* Using fall-through logic */
+	case 'T': case 't':
+		num <<= 10;
+		/* fallthrough */
+	case 'G': case 'g':
+		num <<= 10;
+		/* fallthrough */
+	case 'M': case 'm':
+		num <<= 10;
+		/* fallthrough */
+	case 'K': case 'k':
+		if (log_block_size < 0)
+			num <<= 10;
+		else
+			num >>= log_block_size;
+		break;
+	case 's':
+		if (log_block_size < 0)
+			num <<= 9;
+		else
+			num >>= (1+log_block_size);
+		break;
+	case '\0':
+		break;
+	default:
+		return 0;
+	}
+	return num;
+}
+
+unsigned long parse_num_blocks(const char *arg, int log_block_size)
+{
+	return parse_num_blocks2(arg, log_block_size);
+}
+
+#ifdef DEBUG
+#include <unistd.h>
+#include <stdio.h>
+
+main(int argc, char **argv)
+{
+	unsigned long num;
+	int log_block_size = 0;
+
+	if (argc != 2 && argc != 3) {
+		fprintf(stderr, "Usage: %s arg [log_block_size]\n", argv[0]);
+		exit(1);
+	}
+
+	if (argc == 3) {
+		char *p;
+
+		log_block_size = strtol(argv[2], &p, 0);
+		if (*p) {
+			fprintf(stderr, "Bad log_block_size: %s\n", argv[2]);
+			exit(1);
+		}
+	}
+
+	num = parse_num_blocks(argv[1], log_block_size);
+
+	printf("Parsed number: %lu\n", num);
+	exit(0);
+}
+#endif