getopt.c

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    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 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/rdma/krping/getopt.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/rdma/krping/getopt.c