1/* 2 * getopt.c 3 */ 4 5#include <linux/kernel.h> 6#include <linux/string.h> 7#include <linux/net.h> 8 9#include "getopt.h" 10 11/** 12 * smb_getopt - option parser 13 * @caller: name of the caller, for error messages 14 * @options: the options string 15 * @opts: an array of &struct option entries controlling parser operations 16 * @optopt: output; will contain the current option 17 * @optarg: output; will contain the value (if one exists) 18 * @flag: output; may be NULL; should point to a long for or'ing flags 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 smb_getopt(char *caller, char **options, struct option *opts, 27 char **optopt, char **optarg, unsigned long *flag, 28 unsigned long *value) 29{ 30 char *token; 31 char *val; 32 int i; 33 34 do { 35 if ((token = strsep(options, ",")) == NULL) 36 return 0; 37 } while (*token == '\0'); 38 *optopt = token; 39 40 *optarg = NULL; 41 if ((val = strchr (token, '=')) != NULL) { 42 *val++ = 0; 43 if (value) 44 *value = simple_strtoul(val, NULL, 0); 45 *optarg = val; 46 } 47 48 for (i = 0; opts[i].name != NULL; i++) { 49 if (!strcmp(opts[i].name, token)) { 50 if (!opts[i].flag && (!val || !*val)) { 51 printk("%s: the %s option requires an argument\n", 52 caller, token); 53 return -1; 54 } 55 56 if (flag && opts[i].flag) 57 *flag |= opts[i].flag; 58 59 return opts[i].val; 60 } 61 } 62 printk("%s: Unrecognized mount option %s\n", caller, token); 63 return -1; 64} 65