/*
       * 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
       */
      
  34  int get_option (char **str, int *pint)
      {
      	char *cur = *str;
      
  38  	if (!cur || !(*cur))
  39  		return 0;
      	*pint = simple_strtol (cur, str, 0);
  41  	if (cur == *str)
  42  		return 0;
  43  	if (**str == ',') {
      		(*str)++;
  45  		return 2;
      	}
      
  48  	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).
       */
       
  67  char *get_options (char *str, int nints, int *ints)
      {
      	int res, i = 1;
      
  71  	while (i < nints) {
      		res = get_option (&str, ints + i);
  73  		if (res == 0)
  74  			break;
      		i++;
  76  		if (res == 1)
  77  			break;
      	}
      	ints[0] = i - 1;
  80  	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),
       *	%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.
       */
      
  96  unsigned long memparse (char *ptr, char **retptr)
      {
      	unsigned long ret = simple_strtoul (ptr, retptr, 0);
      
 100  	switch (**retptr) {
 101  	case 'G':
 102  	case 'g':
      		ret <<= 10;
 104  	case 'M':
 105  	case 'm':
      		ret <<= 10;
 107  	case 'K':
 108  	case 'k':
      		ret <<= 10;
      		(*retptr)++;
 111  	default:
 112  		break;
      	}
 114  	return ret;
      }
      
      
      EXPORT_SYMBOL(memparse);
      EXPORT_SYMBOL(get_option);
      EXPORT_SYMBOL(get_options);