fs/smbfs/getopt.c

   1 /*
   2  * getopt.c
   3  */
   4
   5 #include <linux/kernel.h>
   6 #include <linux/string.h>
   7 #include <linux/net.h>
   8
   9 #include "getopt.h"
  10
  11 /**
  12  *      smb_getopt - option parser
  13  *      @caller: name of the caller, for error messages
  14  *      @options: the options string
  15  *      @opts: an array of &struct option entries controlling parser operations
  16  *      @optopt: output; will contain the current option
  17  *      @optarg: output; will contain the value (if one exists)
  18  *      @flag: output; may be NULL; should point to a long for or'ing flags
  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  */
  26 int smb_getopt(char *caller, char **options, struct option *opts,
  27                char **optopt, char **optarg, unsigned long *flag,
  28                unsigned long *value)
  29 {
  30         char *token;
  31         char *val;
  32         int i;
  33
  34         do {
  35                 if ((token = strsep(options, ",")) == NULL)
  36                         return 0;
  37         } while (*token == '\0');
  38         *optopt = token;
  39
  40         *optarg = NULL;
  41         if ((val = strchr (token, '=')) != NULL) {
  42                 *val++ = 0;
  43                 if (value)
  44                         *value = simple_strtoul(val, NULL, 0);
  45                 *optarg = val;
  46         }
  47
  48         for (i = 0; opts[i].name != NULL; i++) {
  49                 if (!strcmp(opts[i].name, token)) {
  50                         if (!opts[i].flag && (!val || !*val)) {
  51                                 printk("%s: the %s option requires an argument\n",
  52                                        caller, token);
  53                                 return -1;
  54                         }
  55
  56                         if (flag && opts[i].flag)
  57                                 *flag |= opts[i].flag;
  58
  59                         return opts[i].val;
  60                 }
  61         }
  62         printk("%s: Unrecognized mount option %s\n", caller, token);
  63         return -1;
  64 }