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/* $OpenBSD: fuse_opt.c,v 1.15 2015/10/19 17:24:07 tedu Exp $ */
/*
* Copyright (c) 2013 Sylvestre Gallon <ccna.syl@gmail.com>
* Copyright (c) 2013 Stefan Sperling <stsp@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "debug.h"
#include "fuse_opt.h"
#include "fuse_private.h"
static void
free_argv(char **argv, int argc)
{
int i;
for (i = 0; i < argc; i++)
free(argv[i]);
free(argv);
}
static int
alloc_argv(struct fuse_args *args)
{
char **argv;
int i;
assert(!args->allocated);
argv = calloc(args->argc, sizeof(*argv));
if (argv == NULL)
return (-1);
if (args->argv) {
for (i = 0; i < args->argc; i++) {
argv[i] = strdup(args->argv[i]);
if (argv[i] == NULL) {
free_argv(argv, i + 1);
return (-1);
}
}
}
args->allocated = 1;
args->argv = argv;
return (0);
}
static int
match_opt(const char *templ, const char *opt)
{
const char *o, *t;
char *arg;
arg = strpbrk(templ, " =");
/* verify template */
t = templ;
if (*t == '-') {
t++;
if (*t == '-')
t++;
if (*t == 'o' || *t == '\0')
return (0);
}
/* skip leading -, -o, and -- in option name */
o = opt;
if (*o == '-') {
o++;
if (*o == 'o' || *o == '-')
o++;
}
/* empty option name is invalid */
if (*o == '\0')
return (0);
/* match option name */
while (*t && *o) {
if (*t++ != *o++)
return (0);
if (arg && t == arg) {
if (*o != ' ' && *o != '=')
return (0);
o++; /* o now points at argument */
if (*o == '\0')
return (0);
break;
}
}
/* match argument */
if (arg) {
if (t != arg)
return (0);
t++;
/* does template have an argument? */
if (*t != '%' && *t != '\0')
return (0);
if (*t == '%' && t[1] == '\0')
return (0);
/* yes it does, consume argument in opt */
while (*o && *o != ' ')
o++;
} else if (*t != '\0')
return (0);
/* we should have consumed entire opt string */
if (*o != '\0')
return (0);
return (1);
}
static int
add_opt(char **opts, const char *opt)
{
char *new_opts;
if (*opts == NULL) {
*opts = strdup(opt);
if (*opts == NULL)
return (-1);
return (0);
}
if (asprintf(&new_opts, "%s,%s", *opts, opt) == -1)
return (-1);
free(*opts);
*opts = new_opts;
return (0);
}
int
fuse_opt_add_opt(char **opts, const char *opt)
{
int ret;
if (opt == NULL || opt[0] == '\0')
return (-1);
ret = add_opt(opts, opt);
return (ret);
}
int
fuse_opt_add_opt_escaped(char **opts, const char *opt)
{
size_t size = 0, escaped = 0;
const char *s = opt;
char *escaped_opt, *p;
int ret;
if (opt == NULL || opt[0] == '\0')
return (-1);
while (*s) {
/* malloc(size + escaped) overflow check */
if (size >= (SIZE_MAX / 2))
return (-1);
if (*s == ',' || *s == '\\')
escaped++;
s++;
size++;
}
if (escaped > 0) {
escaped_opt = malloc(size + escaped);
if (escaped_opt == NULL)
return (-1);
s = opt;
p = escaped_opt;
while (*s) {
switch (*s) {
case ',':
case '\\':
*p++ = '\\';
/* FALLTHROUGH */
default:
*p++ = *s++;
}
}
*p = '\0';
} else {
escaped_opt = strdup(opt);
if (escaped_opt == NULL)
return (-1);
}
ret = add_opt(opts, escaped_opt);
free(escaped_opt);
return (ret);
}
int
fuse_opt_add_arg(struct fuse_args *args, const char *name)
{
return (fuse_opt_insert_arg(args, args->argc, name));
}
static int
parse_opt(const struct fuse_opt *o, const char *val, void *data,
fuse_opt_proc_t f, struct fuse_args *arg)
{
int found, ret, keyval;
size_t idx;
ret = 0;
found = 0;
keyval = 0;
/* check if it is a key=value entry */
idx = strcspn(val, "=");
if (idx != strlen(val)) {
idx++;
keyval = 1;
}
for(; o->templ; o++) {
if ((keyval && strncmp(val, o->templ, idx) == 0) ||
(!keyval && strcmp(val, o->templ) == 0)) {
if (o->val == FUSE_OPT_KEY_DISCARD)
return (1);
if (FUSE_OPT_IS_OPT_KEY(o)) {
if (keyval)
ret = f(data, &val[idx], o->val, arg);
else
ret = f(data, val, o->val, arg);
}
if (o->off != ULONG_MAX && data && o->val >= 0) {
ret = f(data, val, o->val, arg);
int *addr = (int *)(data + o->off);
*addr = o->val;
ret = 0;
}
if (ret == -1)
return (ret);
if (ret == 1)
fuse_opt_add_arg(arg, val);
found++;
break;
}
}
if (!found) {
ret = f(data, val, FUSE_OPT_KEY_OPT, arg);
if (ret == 1)
fuse_opt_add_arg(arg, val);
return (ret);
}
return (ret);
}
/*
* this code is not very sexy but we are forced to follow
* the fuse api.
*
* when f() returns 1 we need to keep the arg
* when f() returns 0 we need to discard the arg
*/
int
fuse_opt_parse(struct fuse_args *args, void *data,
const struct fuse_opt *opt, fuse_opt_proc_t f)
{
struct fuse_args outargs;
const char *arg;
int ret = 0;
int i;
if (!f || !args || !args->argc || !args->argv)
return (0);
bzero(&outargs, sizeof(outargs));
fuse_opt_add_arg(&outargs, args->argv[0]);
for (i = 1; i < args->argc; i++) {
arg = args->argv[i];
/* not - and not -- */
if (arg[0] != '-') {
ret = f(data, arg, FUSE_OPT_KEY_NONOPT, &outargs);
if (ret == 1)
fuse_opt_add_arg(&outargs, arg);
if (ret == -1)
goto err;
} else if (arg[1] == 'o') {
if (arg[2])
arg += 2; /* -ofoo,bar */
else
arg = args->argv[++i];
ret = parse_opt(opt, arg, data, f, &outargs);
if (ret == -1)
goto err;
} else {
ret = parse_opt(opt, arg, data, f, &outargs);
if (ret == -1)
goto err;
}
}
ret = 0;
err:
/* Update args */
fuse_opt_free_args(args);
args->allocated = outargs.allocated;
args->argc = outargs.argc;
args->argv = outargs.argv;
return (ret);
}
int
fuse_opt_insert_arg(struct fuse_args *args, int p, const char *name)
{
char **av;
char *this_arg, *next_arg;
int i;
if (name == NULL)
return (-1);
if (!args->allocated && alloc_argv(args))
return (-1);
if (p < 0 || p > args->argc)
return (-1);
av = reallocarray(args->argv, args->argc + 1, sizeof(*av));
if (av == NULL)
return (-1);
this_arg = strdup(name);
if (this_arg == NULL) {
free(av);
return (-1);
}
args->argc++;
args->argv = av;
for (i = p; i < args->argc; i++) {
next_arg = args->argv[i];
args->argv[i] = this_arg;
this_arg = next_arg;
}
return (0);
}
void
fuse_opt_free_args(struct fuse_args *args)
{
if (!args->allocated)
return;
free_argv(args->argv, args->argc);
args->argv = 0;
args->argc = 0;
args->allocated = 0;
}
int
fuse_opt_match(const struct fuse_opt *opts, const char *opt)
{
const struct fuse_opt *this_opt = opts;
if (opt == NULL || opt[0] == '\0')
return (0);
while (this_opt->templ) {
if (match_opt(this_opt->templ, opt))
return (1);
this_opt++;
}
return (0);
}
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