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getopt.c
Package: linux-2.4.20.tar.gz [view]
Upload User: jlfgdled
Upload Date: 2013-04-10
Package Size: 33168k
Code Size: 2k
Category:
Linux-Unix program
Development Platform:
Unix_Linux
- /*
- * getopt.c
- */
- #include <linux/kernel.h>
- #include <linux/string.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 == '');
- *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 argumentn",
- caller, token);
- return -1;
- }
- if (flag && opts[i].flag)
- *flag |= opts[i].flag;
- return opts[i].val;
- }
- }
- printk("%s: Unrecognized mount option %sn", caller, token);
- return -1;
- }