1 /* 2 * lifted from fs/ncpfs/getopt.c 3 * 4 */ 5 #include <sys/cdefs.h> 6 __FBSDID("$FreeBSD$"); 7 8 #include <sys/ctype.h> 9 #include <sys/param.h> 10 #include <sys/libkern.h> 11 #include "getopt.h" 12 13 /** 14 * krping_getopt - option parser 15 * @caller: name of the caller, for error messages 16 * @options: the options string 17 * @opts: an array of &struct option entries controlling parser operations 18 * @optopt: output; will contain the current option 19 * @optarg: output; will contain the value (if one exists) 20 * @flag: output; may be NULL; should point to a long for or'ing flags 21 * @value: output; may be NULL; will be overwritten with the integer value 22 * of the current argument. 23 * 24 * Helper to parse options on the format used by mount ("a=b,c=d,e,f"). 25 * Returns opts->val if a matching entry in the 'opts' array is found, 26 * 0 when no more tokens are found, -1 if an error is encountered. 27 */ 28 int krping_getopt(const char *caller, char **options, 29 const struct krping_option *opts, char **optopt, 30 char **optarg, unsigned long *value) 31 { 32 char *token; 33 char *val; 34 35 do { 36 if ((token = strsep(options, ",")) == NULL) 37 return 0; 38 } while (*token == '\0'); 39 if (optopt) 40 *optopt = token; 41 42 if ((val = strchr (token, '=')) != NULL) { 43 *val++ = 0; 44 } 45 *optarg = val; 46 for (; opts->name; opts++) { 47 if (!strcmp(opts->name, token)) { 48 if (!val) { 49 if (opts->has_arg & OPT_NOPARAM) { 50 return opts->val; 51 } 52 printf("%s: the %s option requires " 53 "an argument\n", caller, token); 54 return -EINVAL; 55 } 56 if (opts->has_arg & OPT_INT) { 57 char* v; 58 59 *value = strtoul(val, &v, 0); 60 if (!*v) { 61 return opts->val; 62 } 63 printf("%s: invalid numeric value " 64 "in %s=%s\n", caller, token, val); 65 return -EDOM; 66 } 67 if (opts->has_arg & OPT_STRING) { 68 return opts->val; 69 } 70 printf("%s: unexpected argument %s to the " 71 "%s option\n", caller, val, token); 72 return -EINVAL; 73 } 74 } 75 printf("%s: Unrecognized option %s\n", caller, token); 76 return -EOPNOTSUPP; 77 } 78