src/shared/fstab-util.c

	fstab-util.c revision c5e04d51277994cca29234b33a6b8fc90a183cf3
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering/***
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  This file is part of systemd.
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  Copyright 2015 Zbigniew Jędrzejewski-Szmek
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  systemd is free software; you can redistribute it and/or modify it
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  under the terms of the GNU Lesser General Public License as published by
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  the Free Software Foundation; either version 2.1 of the License, or
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  (at your option) any later version.
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  systemd is distributed in the hope that it will be useful, but
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  WITHOUT ANY WARRANTY; without even the implied warranty of
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  Lesser General Public License for more details.
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  You should have received a copy of the GNU Lesser General Public License
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering  along with systemd; If not, see <http://www.gnu.org/licenses/>.
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering***/
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering
96cde13ace6406582688028f3df5668a172ba628Zbigniew Jędrzejewski-Szmek#include "fstab-util.h"
96cde13ace6406582688028f3df5668a172ba628Zbigniew Jędrzejewski-Szmek#include "strv.h"
96cde13ace6406582688028f3df5668a172ba628Zbigniew Jędrzejewski-Szmek#include "util.h"
143bfdaf0b890fa7acadf02d1eafacaef1b696bdHolger Hans Peter Freyther
6482f6269c87d2249e52e889a63adbdd50f2d691Ronny Chevalierint fstab_filter_options(const char *opts, const char *names,
0b452006de98294d1690f045f6ea2f7f6630ec3bRonny Chevalier                         const char **namefound, char **value, char **filtered) {
96cde13ace6406582688028f3df5668a172ba628Zbigniew Jędrzejewski-Szmek        const char *name, *n = NULL, *x;
7027ff61a34a12487712b382a061c654acc3a679Lennart Poettering        _cleanup_strv_free_ char **stor = NULL;
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering        _cleanup_free_ char *v = NULL, **strv = NULL;
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek
96cde13ace6406582688028f3df5668a172ba628Zbigniew Jędrzejewski-Szmek        assert(names && *names);
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek        if (!opts)
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek                goto answer;
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering        /* If !value and !filtered, this function is not allowed to fail. */
96cde13ace6406582688028f3df5668a172ba628Zbigniew Jędrzejewski-Szmek
7027ff61a34a12487712b382a061c654acc3a679Lennart Poettering        if (!filtered) {
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering                const char *word, *state;
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering                size_t l;
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering                FOREACH_WORD_SEPARATOR(word, l, opts, ",", state)
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering                        NULSTR_FOREACH(name, names) {
7027ff61a34a12487712b382a061c654acc3a679Lennart Poettering                                if (l < strlen(name))
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering                                        continue;
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering                                if (!strneq(word, name, strlen(name)))
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering                                        continue;
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                                /* we know that the string is NUL
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                                 * terminated, so *x is valid */
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                                x = word + strlen(name);
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek                                if (IN_SET(*x, '\0', '=', ',')) {
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                                        n = name;
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek                                        if (value) {
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek                                                free(v);
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek                                                if (IN_SET(*x, '\0', ','))
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                                                        v = NULL;
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                                                else {
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                                                        assert(*x == '=');
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                                                        x++;
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                                                        v = strndup(x, l - strlen(name) - 1);
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering                                                        if (!v)
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering                                                                return -ENOMEM;
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering                                                }
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                                        }
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering                                }
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering                        }
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering        } else {
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering                char **t, **s;
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering                stor = strv_split(opts, ",");
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                if (!stor)
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                        return -ENOMEM;
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                strv = memdup(stor, sizeof(char*) * (strv_length(stor) + 1));
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                if (!strv)
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek                        return -ENOMEM;
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek                for (s = t = strv; *s; s++) {
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek                        NULSTR_FOREACH(name, names) {
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek                                x = startswith(*s, name);
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                                if (x && IN_SET(*x, '\0', '='))
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                                        goto found;
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                        }
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering
374ec6abf31ada6ca554cc8ea99b282373fac010Lennart Poettering                        *t = *s;
374ec6abf31ada6ca554cc8ea99b282373fac010Lennart Poettering                        t++;
374ec6abf31ada6ca554cc8ea99b282373fac010Lennart Poettering                        continue;
374ec6abf31ada6ca554cc8ea99b282373fac010Lennart Poettering                found:
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering                        /* Keep the last occurence found */
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering                        n = name;
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering                        if (value) {
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering                                free(v);
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering                                if (*x == '\0')
d7bd3de0654669e65b9642c248c5fa6d1d9a9f61Lennart Poettering                                        v = NULL;
d4fffc4b8beb86e77fd710c1f43913a490ed083aZbigniew Jędrzejewski-Szmek                                else {
320814811417146cfa1e416f69f1101eed630c36Luke Shumaker                                        assert(*x == '=');
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering                                        x++;
7027ff61a34a12487712b382a061c654acc3a679Lennart Poettering                                        v = strdup(x);
6c03089c32c251d823173bda4d809a9e643219f0Lennart Poettering                                        if (!v)
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                                                return -ENOMEM;
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                                }
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                        }
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                }
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                *t = NULL;
96cde13ace6406582688028f3df5668a172ba628Zbigniew Jędrzejewski-Szmek        }
96cde13ace6406582688028f3df5668a172ba628Zbigniew Jędrzejewski-Szmek
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poetteringanswer:
374ec6abf31ada6ca554cc8ea99b282373fac010Lennart Poettering        if (namefound)
374ec6abf31ada6ca554cc8ea99b282373fac010Lennart Poettering                *namefound = n;
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering        if (filtered) {
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering                char *f;
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering
7027ff61a34a12487712b382a061c654acc3a679Lennart Poettering                f = strv_join(strv, ",");
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                if (!f)
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                        return -ENOMEM;
7027ff61a34a12487712b382a061c654acc3a679Lennart Poettering
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                *filtered = f;
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering        }
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering        if (value) {
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                *value = v;
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering                v = NULL;
374ec6abf31ada6ca554cc8ea99b282373fac010Lennart Poettering        }
374ec6abf31ada6ca554cc8ea99b282373fac010Lennart Poettering
cfeaa44a09756a93a881f786678973d9b1e382dbLennart Poettering        return !!n;
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering}
7027ff61a34a12487712b382a061c654acc3a679Lennart Poettering
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poetteringint fstab_find_pri(const char *options, int *ret) {
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering        _cleanup_free_ char *opt = NULL;
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering        int r;
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering        unsigned pri;
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering
7027ff61a34a12487712b382a061c654acc3a679Lennart Poettering        assert(ret);
7027ff61a34a12487712b382a061c654acc3a679Lennart Poettering
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering        r = fstab_filter_options(options, "pri\0", NULL, &opt, NULL);
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering        if (r <= 0)
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering                return r;
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering        r = safe_atou(opt, &pri);
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering        if (r < 0)
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering                return r;
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering        if ((int) pri < 0)
e9174f29c7e3ee45137537b126458718913a3ec5Lennart Poettering                return -ERANGE;
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering
fed1e721fd0c81e60c77120539f34e16c2585634Lennart Poettering        *ret = (int) r;
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering        return 1;
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering}
aff38e74bd776471f15ba54b305a24b0251eb865Lennart Poettering