/*
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* getopt.c
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <asm/errno.h>
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#include "getopt.h"
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/**
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* ncp_getopt - option parser
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* @caller: name of the caller, for error messages
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* @options: the options string
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* @opts: an array of &struct option entries controlling parser operations
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* @optopt: output; will contain the current option
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* @optarg: output; will contain the value (if one exists)
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* @value: output; may be NULL; will be overwritten with the integer value
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* of the current argument.
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*
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* Helper to parse options on the format used by mount ("a=b,c=d,e,f").
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* Returns opts->val if a matching entry in the 'opts' array is found,
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* 0 when no more tokens are found, -1 if an error is encountered.
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*/
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int ncp_getopt(const char *caller, char **options, const struct ncp_option *opts,
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char **optopt, char **optarg, unsigned long *value)
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{
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char *token;
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char *val;
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do {
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if ((token = strsep(options, ",")) == NULL)
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return 0;
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} while (*token == '\0');
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if (optopt)
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*optopt = token;
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if ((val = strchr (token, '=')) != NULL) {
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*val++ = 0;
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}
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*optarg = val;
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for (; opts->name; opts++) {
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if (!strcmp(opts->name, token)) {
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if (!val) {
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if (opts->has_arg & OPT_NOPARAM) {
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return opts->val;
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}
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pr_info("%s: the %s option requires an argument\n",
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caller, token);
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return -EINVAL;
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}
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if (opts->has_arg & OPT_INT) {
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int rc = kstrtoul(val, 0, value);
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if (rc) {
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pr_info("%s: invalid numeric value in %s=%s\n",
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caller, token, val);
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return rc;
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}
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return opts->val;
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}
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if (opts->has_arg & OPT_STRING) {
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return opts->val;
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}
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pr_info("%s: unexpected argument %s to the %s option\n",
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caller, val, token);
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return -EINVAL;
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}
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}
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pr_info("%s: Unrecognized mount option %s\n", caller, token);
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return -EOPNOTSUPP;
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}
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