1/*
2 * lifted from fs/ncpfs/getopt.c
3 *
4 */
5#include <sys/cdefs.h>
6__FBSDID("$FreeBSD: stable/11/sys/contrib/rdma/krping_compat/getopt.c 256470 2013-10-14 23:02:05Z np $");
7
8#include <sys/types.h>
9#include <linux/kernel.h>
10#include <linux/string.h>
11
12#include "getopt.h"
13
14/**
15 *	krping_getopt - option parser
16 *	@caller: name of the caller, for error messages
17 *	@options: the options string
18 *	@opts: an array of &struct option entries controlling parser operations
19 *	@optopt: output; will contain the current option
20 *	@optarg: output; will contain the value (if one exists)
21 *	@flag: output; may be NULL; should point to a long for or'ing flags
22 *	@value: output; may be NULL; will be overwritten with the integer value
23 *		of the current argument.
24 *
25 *	Helper to parse options on the format used by mount ("a=b,c=d,e,f").
26 *	Returns opts->val if a matching entry in the 'opts' array is found,
27 *	0 when no more tokens are found, -1 if an error is encountered.
28 */
29int krping_getopt(const char *caller, char **options,
30		  const struct krping_option *opts, char **optopt,
31		  char **optarg, unsigned long *value)
32{
33	char *token;
34	char *val;
35
36	do {
37		if ((token = strsep(options, ",")) == NULL)
38			return 0;
39	} while (*token == '\0');
40	if (optopt)
41		*optopt = token;
42
43	if ((val = strchr (token, '=')) != NULL) {
44		*val++ = 0;
45	}
46	*optarg = val;
47	for (; opts->name; opts++) {
48		if (!strcmp(opts->name, token)) {
49			if (!val) {
50				if (opts->has_arg & OPT_NOPARAM) {
51					return opts->val;
52				}
53				printk(KERN_INFO "%s: the %s option requires "
54				       "an argument\n", caller, token);
55				return -EINVAL;
56			}
57			if (opts->has_arg & OPT_INT) {
58				char* v;
59
60				*value = simple_strtoul(val, &v, 0);
61				if (!*v) {
62					return opts->val;
63				}
64				printk(KERN_INFO "%s: invalid numeric value "
65				       "in %s=%s\n", caller, token, val);
66				return -EDOM;
67			}
68			if (opts->has_arg & OPT_STRING) {
69				return opts->val;
70			}
71			printk(KERN_INFO "%s: unexpected argument %s to the "
72			       "%s option\n", caller, val, token);
73			return -EINVAL;
74		}
75	}
76	printk(KERN_INFO "%s: Unrecognized option %s\n", caller, token);
77	return -EOPNOTSUPP;
78}
79