1 files changed, 120 insertions, 0 deletions

diff --git a/lib/cmdline.c b/lib/cmdline.c
new file mode 100644
index 000000000000..0331ed825ea7
--- /dev/null
+++ b/lib/cmdline.c
@@ -0,0 +1,120 @@
+/*
+ * linux/lib/cmdline.c
+ * Helper functions generally used for parsing kernel command line
+ * and module options.
+ *
+ * Code and copyrights come from init/main.c and arch/i386/kernel/setup.c.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ *
+ * GNU Indent formatting options for this file: -kr -i8 -npsl -pcs
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+
+/**
+ *      get_option - Parse integer from an option string
+ *      @str: option string
+ *      @pint: (output) integer value parsed from @str
+ *
+ *      Read an int from an option string; if available accept a subsequent
+ *      comma as well.
+ *
+ *      Return values:
+ *      0 : no int in string
+ *      1 : int found, no subsequent comma
+ *      2 : int found including a subsequent comma
+ */
+
+int get_option (char **str, int *pint)
+{
+        char *cur = *str;
+
+        if (!cur || !(*cur))
+                return 0;
+        *pint = simple_strtol (cur, str, 0);
+        if (cur == *str)
+                return 0;
+        if (**str == ',') {
+                (*str)++;
+                return 2;
+        }
+
+        return 1;
+}
+
+/**
+ *      get_options - Parse a string into a list of integers
+ *      @str: String to be parsed
+ *      @nints: size of integer array
+ *      @ints: integer array
+ *
+ *      This function parses a string containing a comma-separated
+ *      list of integers.  The parse halts when the array is
+ *      full, or when no more numbers can be retrieved from the
+ *      string.
+ *
+ *      Return value is the character in the string which caused
+ *      the parse to end (typically a null terminator, if @str is
+ *      completely parseable).
+ */
+ 
+char *get_options(const char *str, int nints, int *ints)
+{
+        int res, i = 1;
+
+        while (i < nints) {
+                res = get_option ((char **)&str, ints + i);
+                if (res == 0)
+                        break;
+                i++;
+                if (res == 1)
+                        break;
+        }
+        ints[0] = i - 1;
+        return (char *)str;
+}
+
+/**
+ *      memparse - parse a string with mem suffixes into a number
+ *      @ptr: Where parse begins
+ *      @retptr: (output) Pointer to next char after parse completes
+ *
+ *      Parses a string into a number.  The number stored at @ptr is
+ *      potentially suffixed with %K (for kilobytes, or 1024 bytes),
+ *      %M (for megabytes, or 1048576 bytes), or %G (for gigabytes, or
+ *      1073741824).  If the number is suffixed with K, M, or G, then
+ *      the return value is the number multiplied by one kilobyte, one
+ *      megabyte, or one gigabyte, respectively.
+ */
+
+unsigned long long memparse (char *ptr, char **retptr)
+{
+        unsigned long long ret = simple_strtoull (ptr, retptr, 0);
+
+        switch (**retptr) {
+        case 'G':
+        case 'g':
+                ret <<= 10;
+        case 'M':
+        case 'm':
+                ret <<= 10;
+        case 'K':
+        case 'k':
+                ret <<= 10;
+                (*retptr)++;
+        default:
+                break;
+        }
+        return ret;
+}
+
+
+EXPORT_SYMBOL(memparse);
+EXPORT_SYMBOL(get_option);
+EXPORT_SYMBOL(get_options);