132 lines
3.7 KiB
C
132 lines
3.7 KiB
C
/* Copyright (C) 2019, 2020 C. McEnroe <june@causal.agency>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* Additional permission under GNU GPL version 3 section 7:
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*
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* If you modify this Program, or any covered work, by linking or
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* combining it with OpenSSL (or a modified version of that library),
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* containing parts covered by the terms of the OpenSSL License and the
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* original SSLeay license, the licensors of this Program grant you
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* additional permission to convey the resulting work. Corresponding
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* Source for a non-source form of such a combination shall include the
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* source code for the parts of OpenSSL used as well as that of the
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* covered work.
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*/
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sysexits.h>
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#include "chat.h"
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#define SUBDIR "catboy"
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struct Base {
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const char *envHome;
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const char *envDirs;
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const char *defHome;
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const char *defDirs;
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};
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static const struct Base Config = {
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.envHome = "XDG_CONFIG_HOME",
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.envDirs = "XDG_CONFIG_DIRS",
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.defHome = ".config",
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.defDirs = "/etc/xdg",
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};
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static const struct Base Data = {
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.envHome = "XDG_DATA_HOME",
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.envDirs = "XDG_DATA_DIRS",
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.defHome = ".local/share",
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.defDirs = "/usr/local/share:/usr/share",
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};
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static char *basePath(
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struct Base base, char *buf, size_t cap, const char *path, int i
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) {
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if (path[strspn(path, ".")] == '/') {
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if (i > 0) return NULL;
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snprintf(buf, cap, "%s", path);
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return buf;
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}
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if (i > 0) {
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const char *dirs = getenv(base.envDirs);
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if (!dirs) dirs = base.defDirs;
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for (; i > 1; --i) {
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dirs += strcspn(dirs, ":");
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dirs += (*dirs == ':');
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}
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if (!*dirs) return NULL;
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snprintf(
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buf, cap, "%.*s/" SUBDIR "/%s",
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(int)strcspn(dirs, ":"), dirs, path
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);
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return buf;
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}
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const char *home = getenv("HOME");
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const char *baseHome = getenv(base.envHome);
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if (baseHome) {
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snprintf(buf, cap, "%s/" SUBDIR "/%s", baseHome, path);
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} else if (home) {
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snprintf(buf, cap, "%s/%s/" SUBDIR "/%s", home, base.defHome, path);
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} else {
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errx(EX_USAGE, "HOME unset");
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}
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return buf;
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}
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char *configPath(char *buf, size_t cap, const char *path, int i) {
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return basePath(Config, buf, cap, path, i);
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}
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char *dataPath(char *buf, size_t cap, const char *path, int i) {
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return basePath(Data, buf, cap, path, i);
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}
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FILE *configOpen(const char *path, const char *mode) {
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char buf[PATH_MAX];
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for (int i = 0; configPath(buf, sizeof(buf), path, i); ++i) {
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FILE *file = fopen(buf, mode);
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if (file) return file;
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if (errno != ENOENT) warn("%s", buf);
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}
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warn("%s", configPath(buf, sizeof(buf), path, 0));
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return NULL;
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}
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FILE *dataOpen(const char *path, const char *mode) {
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char buf[PATH_MAX];
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for (int i = 0; dataPath(buf, sizeof(buf), path, i); ++i) {
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FILE *file = fopen(buf, mode);
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if (file) return file;
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if (errno != ENOENT) warn("%s", buf);
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}
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if (mode[0] != 'r') {
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int error = mkdir(dataPath(buf, sizeof(buf), "", 0), S_IRWXU);
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if (error && errno != EEXIST) warn("%s", buf);
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}
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FILE *file = fopen(dataPath(buf, sizeof(buf), path, 0), mode);
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if (!file) warn("%s", buf);
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return file;
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}
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