/* * getopt.c */ #include <linux/kernel.h> #include <linux/string.h> #include <linux/net.h> #include "getopt.h" /** * smb_getopt - option parser * @caller: name of the caller, for error messages * @options: the options string * @opts: an array of &struct option entries controlling parser operations * @optopt: output; will contain the current option * @optarg: output; will contain the value (if one exists) * @flag: output; may be NULL; should point to a long for or'ing flags * @value: output; may be NULL; will be overwritten with the integer value * of the current argument. * * Helper to parse options on the format used by mount ("a=b,c=d,e,f"). * Returns opts->val if a matching entry in the 'opts' array is found, * 0 when no more tokens are found, -1 if an error is encountered. */ int smb_getopt(char *caller, char **options, struct option *opts, char **optopt, char **optarg, unsigned long *flag, unsigned long *value) { char *token; char *val; int i; do { if ((token = strsep(options, ",")) == NULL) return 0; } while (*token == '\0'); *optopt = token; *optarg = NULL; if ((val = strchr (token, '=')) != NULL) { *val++ = 0; if (value) *value = simple_strtoul(val, NULL, 0); *optarg = val; } for (i = 0; opts[i].name != NULL; i++) { if (!strcmp(opts[i].name, token)) { if (!opts[i].flag && (!val || !*val)) { printk("%s: the %s option requires an argument\n", caller, token); return -1; } if (flag && opts[i].flag) *flag |= opts[i].flag; return opts[i].val; } } printk("%s: Unrecognized mount option %s\n", caller, token); return -1; }