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 */
smb_getopt(char * caller,char ** options,struct option * opts,char ** optopt,char ** optarg,unsigned long * flag,unsigned long * value)26 int 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