diff options
author | Ralf Baechle <ralf@linux-mips.org> | 2000-06-19 22:45:37 +0000 |
---|---|---|
committer | Ralf Baechle <ralf@linux-mips.org> | 2000-06-19 22:45:37 +0000 |
commit | 6d403070f28cd44860fdb3a53be5da0275c65cf4 (patch) | |
tree | 0d0e7fe7b5fb7568d19e11d7d862b77a866ce081 /lib/cmdline.c | |
parent | ecf1bf5f6c2e668d03b0a9fb026db7aa41e292e1 (diff) |
Merge with 2.4.0-test1-ac21 + pile of MIPS cleanups to make merging
possible. Chainsawed RM200 kernel to compile again. Jazz machine
status unknown.
Diffstat (limited to 'lib/cmdline.c')
-rw-r--r-- | lib/cmdline.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/lib/cmdline.c b/lib/cmdline.c new file mode 100644 index 000000000..e147bc0b1 --- /dev/null +++ b/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); |