fs/smbfs/getopt.c

   1 /*
   2  * getopt.c
   3  */
   4
   5 #include <linux/kernel.h>
   6 #include <linux/string.h>
   7
   8 #include "getopt.h"
   9
  10 /**
  11  *      smb_getopt - option parser
  12  *      @caller: name of the caller, for error messages
  13  *      @options: the options string
  14  *      @opts: an array of &struct option entries controlling parser operations
  15  *      @optopt: output; will contain the current option
  16  *      @optarg: output; will contain the value (if one exists)
  17  *      @flag: output; may be NULL; should point to a long for or'ing flags
  18  *      @value: output; may be NULL; will be overwritten with the integer value
  19  *              of the current argument.
  20  *
  21  *      Helper to parse options on the format used by mount ("a=b,c=d,e,f").
  22  *      Returns opts->val if a matching entry in the 'opts' array is found,
  23  *      0 when no more tokens are found, -1 if an error is encountered.
  24  */
  25 int smb_getopt(char *caller, char **options, struct option *opts,
  26                char **optopt, char **optarg, unsigned long *flag,
  27                unsigned long *value)
  28 {
  29         char *token;
  30         char *val;
  31         int i;
  32
  33         if ( (token = strsep(options, ",")) == NULL)
  34                 return 0;
  35         *optopt = token;
  36
  37         *optarg = NULL;
  38         if ((val = strchr (token, '=')) != NULL) {
  39                 *val++ = 0;
  40                 if (value)
  41                         *value = simple_strtoul(val, NULL, 0);
  42                 *optarg = val;
  43         }
  44
  45         for (i = 0; opts[i].name != NULL; i++) {
  46                 if (!strcmp(opts[i].name, token)) {
  47                         if (opts[i].has_arg && (!val || !*val)) {
  48                                 printk("%s: the %s option requires an argument\n",
  49                                        caller, token);
  50                                 return -1;
  51                         }
  52
  53                         if (flag && opts[i].flag)
  54                                 *flag |= opts[i].flag;
  55
  56                         return opts[i].val;
  57                 }
  58         }
  59         printk("%s: Unrecognized mount option %s\n", caller, token);
  60         return -1;
  61 }