patch-2.4.0-test2 linux/lib/cmdline.c

• Lines: 118
• Date: Tue Jun 20 07:52:36 2000
• Orig file: v2.4.0-test1/linux/lib/cmdline.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test1/linux/lib/cmdline.c linux/lib/cmdline.c
@@ -0,0 +1,117 @@
+/*
+ * 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 (char *str, int nints, int *ints)
+{
+	int res, i = 1;
+
+	while (i < nints) {
+		res = get_option (&str, ints + i);
+		if (res == 0)
+			break;
+		i++;
+		if (res == 1)
+			break;
+	}
+	ints[0] = i - 1;
+	return (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) or suffixed with %M (for
+ *	megabytes, or 1048576 bytes).  If the number is suffixed
+ *	with K or M, then the return value is the number
+ *	multiplied by one kilobyte, or one megabyte, respectively.
+ */
+
+unsigned long memparse (char *ptr, char **retptr)
+{
+	unsigned long ret = simple_strtoul (ptr, retptr, 0);
+
+	switch (**retptr) {
+	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);