getopt.c

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    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 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/smbfs/getopt.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/smbfs/getopt.c