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/**
* Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include "state.h"
#include "solar.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <libgamma.h>
#define try(...) do { if (!(__VA_ARGS__)) goto fail; } while (0)
/**
* Is it daytime, night, perhaps some kind of twilight?
*
* @param elevation The Sun's apparent elevation.
* @return The time of the day.
*/
enum darkness
get_darkness(double elevation)
{
if (elevation > SOLAR_ELEVATION_SUNSET_SUNRISE) return DAYTIME;
if (elevation > SOLAR_ELEVATION_CIVIL_DUSK_DAWN) return CIVIL_TWILIGHT;
if (elevation > SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN) return NAUTICAL_TWILIGHT;
if (elevation > SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN) return ASTRONOMICAL_TWILIGHT;
return NIGHT;
}
/**
* Compare two display server environment strings.
*
* @param a_ One of the string.
* @param b_ The other string.
* @return -1, 0, or +1.
*/
static int
displayenvcmp(const void *a_, const void *b_)
{
#define S(V, CD) ((V = ((CD)[1] == 'r' ? strrchr : strchr)(V, (CD)[0])))
#ifdef __GNUC__
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
#endif
char *a = a_;
char *b = b_;
#ifdef __GNUC__
# pragma GCC diagnostic pop
#endif
char *p = strchr(a, '=') + 1;
char *q = strchr(b, '=') + 1;
int rc;
if ((*p != '/') && S(p, ":r") && S(p, ".l")) *p = '\0'; else p = NULL;
if ((*q != '/') && S(p, ":r") && S(p, ".l")) *q = '\0'; else q = NULL;
rc = strcmp(a, b);
if (*p) *p = '.';
if (*q) *q = '.';
return rc;
#undef S
}
/**
* Make an display string safe for a pathname.
*
* @param str The string.
* @return A safe version of the string, `NULL` on error.
*/
static char *
escape_display(const char* str)
{
char *r, *w, *rc = malloc((2 * strlen(str) + 1) * sizeof(char *));
int s = 0;
if (!rc) return NULL;
for (r = w = strchr(rc, '=') + 1; *r; r++) {
if (!s || (*r != '/')) {
if (strchr("@=/", *r)) *w++ = '@';
*w++ = (*r == '/' ? 's' : *r);
s = (*r == '/');
}
}
if (s) w[-2] = '\0';
return rc;
}
/**
* The string of display servers.
*
* @param settings The settings.
* @return The string, `NULL` on error.
*/
static char *
get_display_string(const struct settings *settings)
{
const char *var, *val;
char *r, *d = NULL, *rc = NULL, **displays;
size_t i, n = 0, len = 0;
int method, saved_errno;
try (displays = malloc(settings->monitors_n * sizeof(char *)));
for (i = 0; i < settings->monitors_n; i++)
if ((settings->monitors_arg[i] == 'd') && strchr(settings->monitors_id[i], '='))
len += 1 + strlen(displays[n++] = settings->monitors_id[i]);
if (n) goto custom;
if (!libgamma_list_methods(&method, 1, 0)) {
fprintf(stderr, "No display was found.\n"
"DRM support missing.\n"
"Can you even see?\n");
return errno = 0, NULL;
}
var = libgamma_method_default_site_variable(method);
val = libgamma_method_default_site(method);
if (!val) return strdup("");
try (d = malloc((3 + strlen(var) + strlen(val)) * sizeof(char)));
stpcpy(stpcpy(stpcpy(stpcpy(d, "."), var), "="), val);
try (rc = escape_display(d));
return rc;
custom:
qsort(displays, n, sizeof(*displays), displayenvcmp);
try (r = rc = malloc((2 * len + 1) * sizeof(char)));
for (i = 0; i < n; i++) {
try (d = escape_display(displays[i]));
r = stpcpy(stpcpy(r, "."), d), free(d), d = NULL;
}
return rc;
fail:
saved_errno = errno, free(rc), free(d), errno = saved_errno;
return NULL;
}
/**
* Set $RADHARC_STATE.
*
* @param settings The settings.
* @return 0 on success, -1 on error.
*/
int
get_state_pathname(const struct settings *settings)
{
const char *dir = getenv("XGD_RUNTIME_DIR");
char *display;
char *env;
int rc = -1, saved_errno;
try (display = get_display_string(settings));
if (!dir || !*dir) dir = "/run";
try (env = malloc((strlen(dir) + sizeof("/radharc/") + strlen(display)) * sizeof(char)));
stpcpy(stpcpy(stpcpy(env, dir), "/radharc/"), display);
rc = setenv("RADHARC_STATE", env, 1);
fail:
return saved_errno = errno, free(env), free(display), errno = saved_errno, rc;
}
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