1/*
2 * getopt.c
3 */
4
5#include <linux/kernel.h>
6#include <linux/string.h>
7#include <linux/net.h>
8
9#include "getopt.h"
10
11/**
12 *	smb_getopt - option parser
13 *	@caller: name of the caller, for error messages
14 *	@options: the options string
15 *	@opts: an array of &struct option entries controlling parser operations
16 *	@optopt: output; will contain the current option
17 *	@optarg: output; will contain the value (if one exists)
18 *	@flag: output; may be NULL; should point to a long for or'ing flags
19 *	@value: output; may be NULL; will be overwritten with the integer value
20 *		of the current argument.
21 *
22 *	Helper to parse options on the format used by mount ("a=b,c=d,e,f").
23 *	Returns opts->val if a matching entry in the 'opts' array is found,
24 *	0 when no more tokens are found, -1 if an error is encountered.
25 */
26int smb_getopt(char *caller, char **options, struct option *opts,
27	       char **optopt, char **optarg, unsigned long *flag,
28	       unsigned long *value)
29{
30	char *token;
31	char *val;
32	int i;
33
34	do {
35		if ((token = strsep(options, ",")) == NULL)
36			return 0;
37	} while (*token == '\0');
38	*optopt = token;
39
40	*optarg = NULL;
41	if ((val = strchr (token, '=')) != NULL) {
42		*val++ = 0;
43		if (value)
44			*value = simple_strtoul(val, NULL, 0);
45		*optarg = val;
46	}
47
48	for (i = 0; opts[i].name != NULL; i++) {
49		if (!strcmp(opts[i].name, token)) {
50			if (!opts[i].flag && (!val || !*val)) {
51				printk("%s: the %s option requires an argument\n",
52				       caller, token);
53				return -1;
54			}
55
56			if (flag && opts[i].flag)
57				*flag |= opts[i].flag;
58
59			return opts[i].val;
60		}
61	}
62	printk("%s: Unrecognized mount option %s\n", caller, token);
63	return -1;
64}
65