File: /usr/src/linux/fs/smbfs/getopt.c

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