1 files changed, 40 insertions, 0 deletions
diff --git a/utils/parse_blocksize.c b/utils/parse_blocksize.c
new file mode 100644
index 00000000..3d559276
--- /dev/null
+++ b/utils/parse_blocksize.c
@@ -0,0 +1,40 @@
+/*
+ * Parse a string block size specification. This is approximately a
+ * subset of the block size specs supported by GNU fileutils:
+ *  "nk" = n kilobytes
+ *  "nM" = n megabytes
+ *  "nG" = n gigabytes
+ * All numbers are decimal, and suffixes refer to powers of two.
+ * Case-insensitive.
+ */
+
+#include <ctype.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "defs.h"
+#include "misc.h"
+
+unsigned long parse_blocksize(const char *bs)
+{
+    char *suf;
+    unsigned long r = strtoul(bs, &suf, 10);
+    if (*suf != '\0') {
+        while (*suf && isspace((unsigned char)*suf)) suf++;
+        switch (*suf) {
+          case 'k': case 'K':
+            r *= 1024ul;
+            break;
+          case 'm': case 'M':
+            r *= 1024ul * 1024ul;
+            break;
+          case 'g': case 'G':
+            r *= 1024ul * 1024ul * 1024ul;
+            break;
+          case '\0':
+          default:
+            break;
+        }
+    }
+    return r;
+}