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/*-
* redshift-ng - Automatically adjust display colour temperature according the Sun
*
* Copyright (c) 2009-2018 Jon Lund Steffensen <jonlst@gmail.com>
* Copyright (c) 2014-2016, 2025 Mattias Andrée <m@maandree.se>
*
* redshift-ng 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.
*
* redshift-ng 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 redshift-ng. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
/**
* Paths, in order of priority, to test when looking for
* the configuration file for redshift
*/
static const struct env_path paths[] = {
{0, "XDG_CONFIG_HOME", "/redshift-ng/redshift.conf"},
{0, "XDG_CONFIG_HOME", "/redshift/redshift.conf"},
{0, "XDG_CONFIG_HOME", "/redshift.conf"},
#if defined(WINDOWS)
{0, "localappdata", "/redshift-ng/redshift.conf"},
{0, "localappdata", "/redshift/redshift.conf"},
{0, "localappdata", "/redshift.conf"},
#endif
{0, "HOME", "/.config/redshift-ng/redshift.conf"},
{0, "HOME", "/.config/redshift/redshift.conf"},
{0, "HOME", "/.config/redshift.conf"},
{0, "HOME", "/.redshift.conf"},
{0, NULL, "/.config/redshift-ng/redshift.conf"},
{0, NULL, "/.config/redshift/redshift.conf"},
{0, NULL, "/.config/redshift.conf"},
{0, NULL, "/.redshift.conf"},
{1, "XDG_CONFIG_DIRS", "/redshift-ng/redshift.conf"},
{1, "XDG_CONFIG_DIRS", "/redshift/redshift.conf"},
{1, "XDG_CONFIG_DIRS", "/redshift.conf"},
#if !defined(WINDOWS)
{0, "", "/etc/redshift-ng/redshift.conf"},
{0, "", "/etc/redshift/redshift.conf"},
{0, "", "/etc/redshift.conf"}
#endif
};
/**
* Open the configuration file for reading
*
* @param path The path to the configuration file, or `NULL` if the
* application should look for it in the default paths
* @param path_out Output parameter for the configuration file path
* @param pathbuf_out Output parameter for the memory allocation for `*path_out`;
* will be set to `NULL` unless `path` is `NULL`; shall be
* free(3)d by the caller
* @param should_close_out Output parameter for whether the file should be closed
* @return `FILE` object for the reading the file; `NULL` if not
* found and `path` is `NULL`
*/
static FILE *
open_config_file(const char *path, const char **path_out, char **pathbuf_out, int *should_close_out)
{
FILE *f = NULL;
size_t i;
#ifndef WINDOWS
const char *s;
int fd, old_fd = -1;
#endif
*path_out = path;
*pathbuf_out = NULL;
*should_close_out = 1;
if (!path) {
for (i = 0; !f && i < ELEMSOF(paths); i++)
f = try_path_fopen(&paths[i], path_out, pathbuf_out);
if (f)
weprintf(_("Found configuration file `%s'."), *path_out);
else
weprintf(_("No configuration file found."));
} else if (!strcmp(path, "/dev/null")) { /* needed to allow /dev/null to be specified on Windows */
return NULL;
} else if (!strcmp(path, "-")) {
*should_close_out = 0;
return stdin;
#ifndef WINDOWS
} else if (!strcmp(path, "/dev/stdin")) {
*should_close_out = 0;
return stdin;
} else if (!strcmp(path, "/dev/stdout")) {
fd = STDOUT_FILENO;
goto use_fd;
} else if (!strcmp(path, "/dev/stderr")) {
fd = STDERR_FILENO;
goto use_fd;
} else if (!strncmp(path, "/dev/fd/", sizeof("/dev/fd/") - 1U)) {
s = &path[sizeof("/dev/fd/") - 1U];
# if defined(__linux__)
goto parse_fd;
} else if (!strncmp(path, "/proc/self/fd/", sizeof("/proc/self/fd/") - 1U)) {
s = &path[sizeof("/proc/self/fd/") - 1U];
parse_fd:
# endif
fd = 0;
if (!*s)
goto fallback;
while (isdigit(*s)) {
if (fd > (INT_MAX - (*s & 15)) / 10)
goto fallback;
fd = fd * 10 + (*s & 15);
}
if (*s)
goto fallback;
use_fd:
if (fd > 2) {
fd = dup(old_fd = fd);
if (fd < 0)
eprintf("dup %i:", old_fd);
}
f = fdopen(fd, "r");
if (!f) {
if (old_fd < 0)
eprintf("fdopen %i \"r\":", fd);
else
eprintf("fdopen <duplicate of %i> \"r\":", old_fd);
}
#endif
} else {
#ifndef WINDOWS
fallback:
#endif
f = fopen(path, "r");
if (!f)
eprintf("fopen %s \"r\":", path);
}
return f;
}
const char *
config_ini_init(struct config_ini_state *state, const char *path, char **pathbuf_out)
{
struct config_ini_section *section = NULL;
struct config_ini_setting *setting;
char *line = NULL, *s, *p, *value, *end;
char *next_line = NULL, *name;
size_t size = 0;
ssize_t len = 0; /* initialised to silence false warning from clang */
FILE *f;
int should_close;
state->sections = NULL;
*pathbuf_out = NULL;
f = open_config_file(path, &path, pathbuf_out, &should_close);
if (!f)
return NULL;
#ifndef WINDOWS
again:
#endif
while ((s = next_line) || (len = getline(&line, &size, f)) >= 0) {
if (!s && (s = line, strlen(s) != (size_t)len))
eprintf(_("Config file contains NUL byte."));
s = ltrim(s);
next_line = NULL;
end = &s[strcspn(s, "\r\n")];
if (*end) {
p = end;
do {
*p++ = '\0';
} while (*p == '\r' || *p == '\n');
if (*p)
next_line = p;
}
rtrim(s, end);
switch (*s) {
case ';': /* comment line */
case '#': /* comment line */
case '\0': /* blank line */
break;
case '[': /* "[%s]", section */
end = strchr(name = &s[1], ']');
if (!end || end[1] || end == name)
eprintf(_("Malformed section header in config file."));
*end = '\0';
section = emalloc(sizeof(*section));
section->name = estrdup(name);
section->settings = NULL;
section->next = state->sections;
state->sections = section;
break;
default: /* "%s = %s", name, value */
value = p = strchr(name = s, '=');
if (!value || value == name)
eprintf(_("Malformed assignment in config file."));
*value++ = '\0';
if (!section)
eprintf(_("Assignment outside section in config file."));
setting = emalloc(sizeof(*setting));
setting->name = estrdup(rtrim(name, p));
setting->value = estrdup(rtrim(ltrim(value), NULL));
setting->next = section->settings;
section->settings = setting;
break;
}
}
if (ferror(f)) {
#ifndef WINDOWS
if (errno == EINTR) {
clearerr(f);
goto again;
}
#endif
eprintf("getline %s:", path);
}
free(line);
if (should_close)
fclose(f);
return path;
}
void
config_ini_free(struct config_ini_state *state)
{
struct config_ini_section *section, *section_next;
struct config_ini_setting *setting, *setting_next;
for (section = state->sections; section; section = section_next) {
section_next = section->next;
for (setting = section->settings; setting; setting = setting_next) {
setting_next = setting->next;
free(setting->name);
free(setting->value);
free(setting);
}
free(section->name);
free(section);
}
}
struct config_ini_section *
config_ini_get_section(struct config_ini_state *state, const char *name)
{
/* TODO deal with multiple section definitions */
struct config_ini_section *section;
for (section = state->sections; section; section = section->next)
if (!strcasecmp(section->name, name))
return section;
return NULL;
}
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