PageRenderTime 4ms CodeModel.GetById 0ms app.highlight 3ms RepoModel.GetById 0ms app.codeStats 0ms

/fs/ncpfs/getopt.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 74 lines | 50 code | 7 blank | 17 comment | 14 complexity | 39fca916acd2adcfbeb4d75d15b14a56 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
 1/*
 2 * getopt.c
 3 */
 4
 5#include <linux/kernel.h>
 6#include <linux/string.h>
 7
 8#include <asm/errno.h>
 9
10#include "getopt.h"
11
12/**
13 *	ncp_getopt - option parser
14 *	@caller: name of the caller, for error messages
15 *	@options: the options string
16 *	@opts: an array of &struct option entries controlling parser operations
17 *	@optopt: output; will contain the current option
18 *	@optarg: output; will contain the value (if one exists)
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 ncp_getopt(const char *caller, char **options, const struct ncp_option *opts,
27	       char **optopt, char **optarg, unsigned long *value)
28{
29	char *token;
30	char *val;
31
32	do {
33		if ((token = strsep(options, ",")) == NULL)
34			return 0;
35	} while (*token == '\0');
36	if (optopt)
37		*optopt = token;
38
39	if ((val = strchr (token, '=')) != NULL) {
40		*val++ = 0;
41	}
42	*optarg = val;
43	for (; opts->name; opts++) {
44		if (!strcmp(opts->name, token)) {
45			if (!val) {
46				if (opts->has_arg & OPT_NOPARAM) {
47					return opts->val;
48				}
49				printk(KERN_INFO "%s: the %s option requires an argument\n",
50				       caller, token);
51				return -EINVAL;
52			}
53			if (opts->has_arg & OPT_INT) {
54				char* v;
55
56				*value = simple_strtoul(val, &v, 0);
57				if (!*v) {
58					return opts->val;
59				}
60				printk(KERN_INFO "%s: invalid numeric value in %s=%s\n",
61					caller, token, val);
62				return -EDOM;
63			}
64			if (opts->has_arg & OPT_STRING) {
65				return opts->val;
66			}
67			printk(KERN_INFO "%s: unexpected argument %s to the %s option\n",
68				caller, val, token);
69			return -EINVAL;
70		}
71	}
72	printk(KERN_INFO "%s: Unrecognized mount option %s\n", caller, token);
73	return -EOPNOTSUPP;
74}