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