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/* $NetBSD: refuse_opt.c,v 1.15 2011/03/01 11:23:42 soda Exp $ */
/*-
* Copyright (c) 2007 Juan Romero Pardines.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* TODO:
* * -oblah,foo... works, but the options are not enabled.
* * -ofoo=%s (accepts a string) or -ofoo=%u (int) is not
* supported for now.
* * void *data: how is it used? I think it's used to enable
* options or pass values for the matching options.
*/
#include <sys/types.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "fuse.h"
#include "fuse_opt.h"
#ifdef FUSE_OPT_DEBUG
#define DPRINTF(x) do { printf x; } while ( /* CONSTCOND */ 0)
#else
#define DPRINTF(x)
#endif
enum {
KEY_HELP,
KEY_VERBOSE,
KEY_VERSION
};
struct fuse_opt_option {
const struct fuse_opt *fop;
char *option;
int key;
void *data;
};
static int fuse_opt_popt(struct fuse_opt_option *, const struct fuse_opt *);
static int fuse_opt_realloc_args(struct fuse_args *args, int nargc);
/*
* Public API.
*
* The following functions always return 0:
*
* int fuse_opt_add_opt(char **, const char *);
*
* We implement the next ones:
*
* int fuse_opt_add_arg(struct fuse_args *, const char *);
* void fuse_opt_free_args(struct fuse_args *);
* int fuse_opt_insert_arg(struct fuse_args *, const char *);
* int fuse_opt_match(const struct fuse_opt *, const char *);
* int fuse_opt_parse(struct fuse_args *, void *,
* const struct fuse_opt *, fuse_opt_proc_t);
*
*/
/* ARGSUSED */
int
fuse_opt_add_arg(struct fuse_args *args, const char *arg)
{
fuse_opt_realloc_args(args, args->argc + 1);
DPRINTF(("%s: arguments passed: [arg:%s]\n", __func__, arg));
if ((args->argv[args->argc++] = strdup(arg)) == NULL)
err(1, "fuse_opt_add_arg");
args->argv[args->argc] = NULL;
return 0;
}
struct fuse_args *
fuse_opt_deep_copy_args(int argc, char **argv)
{
struct fuse_args *ap;
int i;
if ((ap = malloc(sizeof(*ap))) == NULL)
err(1, "_fuse_deep_copy_args");
/* deep copy args structure into channel args */
ap->allocated = ((argc / 10) + 1) * 10;
if ((ap->argv = calloc((size_t)ap->allocated,
sizeof(*ap->argv))) == NULL)
err(1, "_fuse_deep_copy_args");
for (i = 0; i < argc; i++) {
if ((ap->argv[i] = strdup(argv[i])) == NULL)
err(1, "_fuse_deep_copy_args");
}
ap->argv[ap->argc = i] = NULL;
return ap;
}
static int
fuse_opt_realloc_args(struct fuse_args *args, int nargc)
{
struct fuse_args *ap;
if (args->allocated == 0) {
ap = fuse_opt_deep_copy_args(args->argc, args->argv);
args->argv = ap->argv;
args->argc = ap->argc;
args->allocated = ap->allocated;
(void) free(ap);
} else if (args->allocated < nargc) {
void *a;
int na = nargc + 10;
if ((a = realloc(args->argv, na * sizeof(*args->argv))) == NULL)
return -1;
args->argv = a;
args->allocated = na;
}
return 0;
}
void
fuse_opt_free_args(struct fuse_args *ap)
{
int i;
for (i = 0; i < ap->argc; i++) {
free(ap->argv[i]);
}
free(ap->argv);
ap->argv = NULL;
ap->allocated = ap->argc = 0;
}
/* ARGSUSED */
int
fuse_opt_insert_arg(struct fuse_args *args, int pos, const char *arg)
{
int i;
DPRINTF(("%s: arguments passed: [pos=%d] [arg=%s]\n",
__func__, pos, arg));
fuse_opt_realloc_args(args, args->argc + 1);
for (i = args->argc++; i > pos; --i) {
args->argv[i] = args->argv[i - 1];
}
if ((args->argv[pos] = strdup(arg)) == NULL)
err(1, "fuse_opt_insert_arg");
args->argv[args->argc] = NULL;
return 0;
}
/* ARGSUSED */
int fuse_opt_add_opt(char **opts, const char *opt)
{
DPRINTF(("%s: arguments passed: [opts=%s] [opt=%s]\n",
__func__, *opts, opt));
return 0;
}
/*
* Returns 0 if opt was matched with any option from opts,
* otherwise returns 1.
*/
int
fuse_opt_match(const struct fuse_opt *opts, const char *opt)
{
while (opts++) {
if (strcmp(opt, opts->templ) == 0)
return 0;
}
return 1;
}
/*
* Returns 0 if foo->option was matched with any option from opts,
* and sets the following on match:
*
* * foo->key is set to the foo->fop->value if offset == -1.
* * foo->fop points to the matched struct opts.
*
* otherwise returns 1.
*/
static int
fuse_opt_popt(struct fuse_opt_option *foo, const struct fuse_opt *opts)
{
int i, found = 0;
char *match;
if (!foo->option) {
(void)fprintf(stderr, "fuse: missing argument after -o\n");
return 1;
}
/*
* iterate over argv and opts to see
* if there's a match with any template.
*/
for (match = strtok(foo->option, ",");
match; match = strtok(NULL, ",")) {
DPRINTF(("%s: specified option='%s'\n", __func__, match));
found = 0;
for (i = 0; opts && opts->templ; opts++, i++) {
DPRINTF(("%s: opts->templ='%s' opts->offset=%d "
"opts->value=%d\n", __func__, opts->templ,
opts->offset, opts->value));
/* option is ok */
if (strcmp(match, opts->templ) == 0) {
DPRINTF(("%s: option matched='%s'\n",
__func__, match));
found++;
/*
* our fop pointer now points
* to the matched struct opts.
*/
foo->fop = opts;
/*
* assign default key value, necessary for
* KEY_HELP, KEY_VERSION and KEY_VERBOSE.
*/
if (foo->fop->offset == -1)
foo->key = foo->fop->value;
/* reset counter */
opts -= i;
break;
}
}
/* invalid option */
if (!found) {
(void)fprintf(stderr, "fuse: '%s' is not a "
"valid option\n", match);
return 1;
}
}
return 0;
}
/* ARGSUSED1 */
int
fuse_opt_parse(struct fuse_args *args, void *data,
const struct fuse_opt *opts, fuse_opt_proc_t proc)
{
struct fuse_opt_option foo;
char *buf;
int i, rv = 0;
if (!args || !args->argv || !args->argc || !proc)
return 0;
foo.data = data;
if (args->argc == 1)
return proc(foo.data, *args->argv, FUSE_OPT_KEY_OPT, args);
/* the real loop to process the arguments */
for (i = 1; i < args->argc; i++) {
/* assign current argv string */
foo.option = buf = args->argv[i];
/* argvn != -foo... */
if (buf[0] != '-') {
foo.key = FUSE_OPT_KEY_NONOPT;
rv = proc(foo.data, foo.option, foo.key, args);
if (rv != 0)
break;
/* -o was specified... */
} else if (buf[0] == '-' && buf[1] == 'o') {
/* -oblah,foo... */
if (buf[2]) {
/* skip -o */
foo.option = args->argv[i] + 2;
/* -o blah,foo... */
} else {
/*
* skip current argv and pass to the
* next one to parse the options.
*/
++i;
foo.option = args->argv[i];
}
rv = fuse_opt_popt(&foo, opts);
if (rv != 0)
break;
/* help/version/verbose argument */
} else if (buf[0] == '-' && buf[1] != 'o') {
/*
* check if the argument matches
* with any template in opts.
*/
rv = fuse_opt_popt(&foo, opts);
if (rv != 0) {
break;
} else {
DPRINTF(("%s: foo.fop->templ='%s' "
"foo.fop->offset: %d "
"foo.fop->value: %d\n",
__func__, foo.fop->templ,
foo.fop->offset, foo.fop->value));
/* argument needs to be discarded */
if (foo.key == FUSE_OPT_KEY_DISCARD) {
rv = 1;
break;
}
/* process help/version argument */
if (foo.key != KEY_VERBOSE &&
foo.key != FUSE_OPT_KEY_KEEP) {
rv = proc(foo.data, foo.option,
foo.key, args);
break;
} else {
/* process verbose argument */
rv = proc(foo.data, foo.option,
foo.key, args);
if (rv != 0)
break;
}
}
/* unknown option, how could that happen? */
} else {
DPRINTF(("%s: unknown option\n", __func__));
rv = 1;
break;
}
}
return rv;
}
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