sys/contrib/rdma/krping/getopt.c

   1 /*
   2  * lifted from fs/ncpfs/getopt.c
   3  *
   4  */
   5 #include <sys/cdefs.h>
   6 __FBSDID("$FreeBSD$");
   7
   8 #include <sys/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/string.h>
  11
  12 #include "getopt.h"
  13
  14 /**
  15  *      krping_getopt - option parser
  16  *      @caller: name of the caller, for error messages
  17  *      @options: the options string
  18  *      @opts: an array of &struct option entries controlling parser operations
  19  *      @optopt: output; will contain the current option
  20  *      @optarg: output; will contain the value (if one exists)
  21  *      @flag: output; may be NULL; should point to a long for or'ing flags
  22  *      @value: output; may be NULL; will be overwritten with the integer value
  23  *              of the current argument.
  24  *
  25  *      Helper to parse options on the format used by mount ("a=b,c=d,e,f").
  26  *      Returns opts->val if a matching entry in the 'opts' array is found,
  27  *      0 when no more tokens are found, -1 if an error is encountered.
  28  */
  29 int krping_getopt(const char *caller, char **options,
  30                   const struct krping_option *opts, char **optopt,
  31                   char **optarg, unsigned long *value)
  32 {
  33         char *token;
  34         char *val;
  35
  36         do {
  37                 if ((token = strsep(options, ",")) == NULL)
  38                         return 0;
  39         } while (*token == '\0');
  40         if (optopt)
  41                 *optopt = token;
  42
  43         if ((val = strchr (token, '=')) != NULL) {
  44                 *val++ = 0;
  45         }
  46         *optarg = val;
  47         for (; opts->name; opts++) {
  48                 if (!strcmp(opts->name, token)) {
  49                         if (!val) {
  50                                 if (opts->has_arg & OPT_NOPARAM) {
  51                                         return opts->val;
  52                                 }
  53                                 printk(KERN_INFO "%s: the %s option requires "
  54                                        "an argument\n", caller, token);
  55                                 return -EINVAL;
  56                         }
  57                         if (opts->has_arg & OPT_INT) {
  58                                 char* v;
  59
  60                                 *value = simple_strtoul(val, &v, 0);
  61                                 if (!*v) {
  62                                         return opts->val;
  63                                 }
  64                                 printk(KERN_INFO "%s: invalid numeric value "
  65                                        "in %s=%s\n", caller, token, val);
  66                                 return -EDOM;
  67                         }
  68                         if (opts->has_arg & OPT_STRING) {
  69                                 return opts->val;
  70                         }
  71                         printk(KERN_INFO "%s: unexpected argument %s to the "
  72                                "%s option\n", caller, val, token);
  73                         return -EINVAL;
  74                 }
  75         }
  76         printk(KERN_INFO "%s: Unrecognized option %s\n", caller, token);
  77         return -EOPNOTSUPP;
  78 }