LXR linux/fs/ncpfs/getopt.c

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