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