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