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 } 79