mirror of https://gitee.com/openkylin/linux.git
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
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/*
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* getopt.c
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/net.h>
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#include "getopt.h"
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/**
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* smb_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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* @flag: output; may be NULL; should point to a long for or'ing flags
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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 smb_getopt(char *caller, char **options, struct option *opts,
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char **optopt, char **optarg, unsigned long *flag,
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unsigned long *value)
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{
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char *token;
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char *val;
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int i;
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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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*optopt = token;
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*optarg = NULL;
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if ((val = strchr (token, '=')) != NULL) {
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*val++ = 0;
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if (value)
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*value = simple_strtoul(val, NULL, 0);
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*optarg = val;
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}
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for (i = 0; opts[i].name != NULL; i++) {
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if (!strcmp(opts[i].name, token)) {
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if (!opts[i].flag && (!val || !*val)) {
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printk("%s: the %s option requires an argument\n",
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caller, token);
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return -1;
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}
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if (flag && opts[i].flag)
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*flag |= opts[i].flag;
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return opts[i].val;
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}
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}
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printk("%s: Unrecognized mount option %s\n", caller, token);
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return -1;
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}
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