Viewing file:  getopt.c (1.59 KB) -rw-r--r--
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/*
* getopt.c
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include "getopt.h"
/**
* smb_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)
* @flag: output; may be NULL; should point to a long for or'ing flags
* @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 smb_getopt(char *caller, char **options, struct option *opts,
char **optopt, char **optarg, unsigned long *flag,
unsigned long *value)
{
char *token;
char *val;
int i;
do {
if ((token = strsep(options, ",")) == NULL)
return 0;
} while (*token == '\0');
*optopt = token;
*optarg = NULL;
if ((val = strchr (token, '=')) != NULL) {
*val++ = 0;
if (value)
*value = simple_strtoul(val, NULL, 0);
*optarg = val;
}
for (i = 0; opts[i].name != NULL; i++) {
if (!strcmp(opts[i].name, token)) {
if (!opts[i].flag && (!val || !*val)) {
printk("%s: the %s option requires an argument\n",
caller, token);
return -1;
}
if (flag && opts[i].flag)
*flag |= opts[i].flag;
return opts[i].val;
}
}
printk("%s: Unrecognized mount option %s\n", caller, token);
return -1;
}
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