[linux-2.6-block.git] / fs / ncpfs / getopt.c

// SPDX-License-Identifier: GPL-2.0
/*
 * getopt.c
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/string.h>

#include <asm/errno.h>

#include "getopt.h"

/**
 *	ncp_getopt - option parser
 *	@caller: name of the caller, for error messages
 *	@options: the options string
 *	@opts: an array of &struct option entries controlling parser operations
 *	@optopt: output; will contain the current option
 *	@optarg: output; will contain the value (if one exists)
 *	@value: output; may be NULL; will be overwritten with the integer value
 *		of the current argument.
 *
 *	Helper to parse options on the format used by mount ("a=b,c=d,e,f").
 *	Returns opts->val if a matching entry in the 'opts' array is found,
 *	0 when no more tokens are found, -1 if an error is encountered.
 */
int ncp_getopt(const char *caller, char **options, const struct ncp_option *opts,
	       char **optopt, char **optarg, unsigned long *value)
{
	char *token;
	char *val;

	do {
		if ((token = strsep(options, ",")) == NULL)
			return 0;
	} while (*token == '\0');
	if (optopt)
		*optopt = token;

	if ((val = strchr (token, '=')) != NULL) {
		*val++ = 0;
	}
	*optarg = val;
	for (; opts->name; opts++) {
		if (!strcmp(opts->name, token)) {
			if (!val) {
				if (opts->has_arg & OPT_NOPARAM) {
					return opts->val;
				}
				pr_info("%s: the %s option requires an argument\n",
					caller, token);
				return -EINVAL;
			}
			if (opts->has_arg & OPT_INT) {
				int rc = kstrtoul(val, 0, value);

				if (rc) {
					pr_info("%s: invalid numeric value in %s=%s\n",
						caller, token, val);
					return rc;
				}
				return opts->val;
			}
			if (opts->has_arg & OPT_STRING) {
				return opts->val;
			}
			pr_info("%s: unexpected argument %s to the %s option\n",
				caller, val, token);
			return -EINVAL;
		}
	}
	pr_info("%s: Unrecognized mount option %s\n", caller, token);
	return -EOPNOTSUPP;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* getopt.c
	4	*/
	5
b41f8b84 JP	6	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
b41f8b84 JP	7
1da177e4 LT	8	#include <linux/kernel.h>
	9	#include <linux/string.h>
	10
	11	#include <asm/errno.h>
	12
	13	#include "getopt.h"
	14
	15	/**
	16	* ncp_getopt - option parser
	17	* @caller: name of the caller, for error messages
	18	* @options: the options string
	19	* @opts: an array of &struct option entries controlling parser operations
	20	* @optopt: output; will contain the current option
	21	* @optarg: output; will contain the value (if one exists)
1da177e4 LT	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	*/
	29	int ncp_getopt(const char caller, char options, const struct ncp_option opts,
	30	char optopt, char optarg, unsigned long *value)
	31	{
	32	char *token;
	33	char *val;
	34
	35	do {
	36	if ((token = strsep(options, ",")) == NULL)
	37	return 0;
	38	} while (*token == '\0');
	39	if (optopt)
	40	*optopt = token;
	41
	42	if ((val = strchr (token, '=')) != NULL) {
	43	*val++ = 0;
	44	}
	45	*optarg = val;
	46	for (; opts->name; opts++) {
	47	if (!strcmp(opts->name, token)) {
	48	if (!val) {
	49	if (opts->has_arg & OPT_NOPARAM) {
	50	return opts->val;
	51	}
b41f8b84 JP	52	pr_info("%s: the %s option requires an argument\n",
b41f8b84 JP	53	caller, token);
1da177e4 LT	54	return -EINVAL;
	55	}
	56	if (opts->has_arg & OPT_INT) {
8091b895	57	int rc = kstrtoul(val, 0, value);
1da177e4	58
8091b895 FF	59	if (rc) {
	60	pr_info("%s: invalid numeric value in %s=%s\n",
	61	caller, token, val);
	62	return rc;
1da177e4	63	}
8091b895	64	return opts->val;
1da177e4 LT	65	}
	66	if (opts->has_arg & OPT_STRING) {
	67	return opts->val;
	68	}
b41f8b84	69	pr_info("%s: unexpected argument %s to the %s option\n",
1da177e4 LT	70	caller, val, token);
	71	return -EINVAL;
	72	}
	73	}
b41f8b84	74	pr_info("%s: Unrecognized mount option %s\n", caller, token);
1da177e4 LT	75	return -EOPNOTSUPP;
1da177e4 LT	76	}