/* * 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);