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/* Copyright (C) 2019, 2020 June 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 <sysexits.h>
#define SUBDIR "pounce"
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 char *basePath(
struct Base base, char *buf, size_t cap, const char *path, int i
) {
if (path[strspn(path, ".")] == '/') {
if (i > 0) return NULL;
snprintf(buf, cap, "%s", path);
return buf;
}
if (i > 0) {
const char *dirs = getenv(base.envDirs);
if (!dirs) dirs = base.defDirs;
for (; i > 1; --i) {
dirs += strcspn(dirs, ":");
dirs += (*dirs == ':');
}
if (!*dirs) return NULL;
snprintf(
buf, cap, "%.*s/" SUBDIR "/%s",
(int)strcspn(dirs, ":"), dirs, path
);
return buf;
}
const char *home = getenv("HOME");
const char *baseHome = getenv(base.envHome);
if (baseHome) {
snprintf(buf, cap, "%s/" SUBDIR "/%s", baseHome, path);
} else if (home) {
snprintf(buf, cap, "%s/%s/" SUBDIR "/%s", home, base.defHome, path);
} else {
errx(EX_USAGE, "HOME unset");
}
return buf;
}
char *configPath(char *buf, size_t cap, const char *path, int i) {
return basePath(Config, buf, cap, path, i);
}
char *dataPath(char *buf, size_t cap, const char *path, int i) {
return basePath(Data, buf, cap, path, i);
}
FILE *configOpen(const char *path, const char *mode) {
char buf[PATH_MAX];
for (int i = 0; configPath(buf, sizeof(buf), path, i); ++i) {
FILE *file = fopen(buf, mode);
if (file) return file;
if (errno != ENOENT) warn("%s", buf);
}
warn("%s", configPath(buf, sizeof(buf), path, 0));
return NULL;
}
FILE *dataOpen(const char *path, const char *mode) {
char buf[PATH_MAX];
for (int i = 0; dataPath(buf, sizeof(buf), path, i); ++i) {
FILE *file = fopen(buf, mode);
if (file) return file;
if (errno != ENOENT) warn("%s", buf);
}
if (mode[0] != 'r') {
int error = mkdir(dataPath(buf, sizeof(buf), "", 0), S_IRWXU);
if (error && errno != EEXIST) warn("%s", buf);
}
FILE *file = fopen(dataPath(buf, sizeof(buf), path, 0), mode);
if (!file) warn("%s", buf);
return file;
}
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