linux/fs/ncpfs/getopt.c
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   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 *      @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 */
  26int ncp_getopt(const char *caller, char **options, const struct ncp_option *opts,
  27               char **optopt, char **optarg, unsigned long *value)
  28{
  29        char *token;
  30        char *val;
  31
  32        do {
  33                if ((token = strsep(options, ",")) == NULL)
  34                        return 0;
  35        } while (*token == '\0');
  36        if (optopt)
  37                *optopt = token;
  38
  39        if ((val = strchr (token, '=')) != NULL) {
  40                *val++ = 0;
  41        }
  42        *optarg = val;
  43        for (; opts->name; opts++) {
  44                if (!strcmp(opts->name, token)) {
  45                        if (!val) {
  46                                if (opts->has_arg & OPT_NOPARAM) {
  47                                        return opts->val;
  48                                }
  49                                printk(KERN_INFO "%s: the %s option requires an argument\n",
  50                                       caller, token);
  51                                return -EINVAL;
  52                        }
  53                        if (opts->has_arg & OPT_INT) {
  54                                char* v;
  55
  56                                *value = simple_strtoul(val, &v, 0);
  57                                if (!*v) {
  58                                        return opts->val;
  59                                }
  60                                printk(KERN_INFO "%s: invalid numeric value in %s=%s\n",
  61                                        caller, token, val);
  62                                return -EDOM;
  63                        }
  64                        if (opts->has_arg & OPT_STRING) {
  65                                return opts->val;
  66                        }
  67                        printk(KERN_INFO "%s: unexpected argument %s to the %s option\n",
  68                                caller, val, token);
  69                        return -EINVAL;
  70                }
  71        }
  72        printk(KERN_INFO "%s: Unrecognized mount option %s\n", caller, token);
  73        return -EOPNOTSUPP;
  74}
  75
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