/**
* mnt_optstr_deduplicate_option:
* @optstr: string with a comma separated list of options
* @name: requested option name
*
* Removes all instances of @name except the last one.
*
* Returns: 0 on success, 1 when not found the @name or negative number in case
* of error.
*/
int mnt_optstr_deduplicate_option(char **optstr, const char *name)
{
int rc;
char *begin = NULL, *end = NULL, *opt;
assert(optstr);
assert(name);
opt = *optstr;
do {
struct libmnt_optloc ol;
mnt_init_optloc(&ol);
rc = mnt_optstr_locate_option(opt, name, &ol);
if (!rc) {
if (begin) {
/* remove the previous instance */
size_t shift = strlen(*optstr);
mnt_optstr_remove_option_at(optstr, begin, end);
/* now all the offsets are not valid anymore - recount */
shift -= strlen(*optstr);
ol.begin -= shift;
ol.end -= shift;
}
begin = ol.begin;
end = ol.end;
opt = end && *end ? end + 1 : NULL;
}
} while (rc == 0 && opt && *opt);
return rc < 0 ? rc : begin ? 0 : 1;
}
/**
* mnt_optstr_remove_option:
* @optstr: string with comma separated list of options
* @name: requested option name
*
* Returns: 0 on success, 1 when not found the @name or negative number in case
* of error.
*/
int mnt_optstr_remove_option(char **optstr, const char *name)
{
struct libmnt_optloc ol;
int rc;
mnt_init_optloc(&ol);
rc = mnt_optstr_locate_option(*optstr, name, &ol);
if (rc != 0)
return rc;
mnt_optstr_remove_option_at(optstr, ol.begin, ol.end);
return 0;
}
/**
* mnt_optstr_get_option:
* @optstr: string with comma separated list of options
* @name: requested option name
* @value: returns pointer to the begin of the value (e.g. name=VALUE) or NULL
* @valsz: returns size of the value or 0
*
* Returns: 0 on success, 1 when not found the @name or negative number in case
* of error.
*/
int mnt_optstr_get_option(const char *optstr, const char *name,
char **value, size_t *valsz)
{
struct libmnt_optloc ol;
int rc;
mnt_init_optloc(&ol);
rc = mnt_optstr_locate_option((char *) optstr, name, &ol);
if (!rc) {
if (value)
*value = ol.value;
if (valsz)
*valsz = ol.valsz;
}
return rc;
}
/**
* mnt_optstr_set_option:
* @optstr: string with a comma separated list of options
* @name: requested option
* @value: new value or NULL
*
* Set or unset the option @value.
*
* Returns: 0 on success, 1 when not found the @name or negative number in case
* of error.
*/
int mnt_optstr_set_option(char **optstr, const char *name, const char *value)
{
struct libmnt_optloc ol;
char *nameend;
int rc = 1;
assert(optstr);
assert(name);
if (!optstr)
return -EINVAL;
mnt_init_optloc(&ol);
if (*optstr)
rc = mnt_optstr_locate_option(*optstr, name, &ol);
if (rc < 0)
return rc; /* parse error */
if (rc == 1)
return mnt_optstr_append_option(optstr, name, value); /* not found */
nameend = ol.begin + ol.namesz;
if (value == NULL && ol.value && ol.valsz)
/* remove unwanted "=value" */
mnt_optstr_remove_option_at(optstr, nameend, ol.end);
else if (value && ol.value == NULL)
/* insert "=value" */
rc = insert_value(optstr, nameend, value, NULL);
else if (value && ol.value && strlen(value) == ol.valsz)
/* simply replace =value */
memcpy(ol.value, value, ol.valsz);
else if (value && ol.value) {
mnt_optstr_remove_option_at(optstr, nameend, ol.end);
rc = insert_value(optstr, nameend, value, NULL);
}
return rc;
}