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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"
char *
rtrim(char *s, char *end)
{
end = end ? end : strchr(s, '\0');
while (end != s && (end[-1] == ' ' || end[-1] == '\t'))
end--;
*end = '\0';
return s;
}
char *
ltrim(char *s)
{
while (*s == ' ' || *s == '\t')
s++;
return s;
}
const char *
get_home(void)
{
#ifdef WINDOWS
return NULL;
#else
static const char *home = NULL;
struct passwd *pw;
if (!home) {
pw = getpwuid(getuid());
if (pw) {
home = pw->pw_dir;
if (home && *home)
return home;
weprintf(_("Cannot determine your home directory, "
"it is from the system's user table."));
} else if (errno) {
weprintf("getpwuid:");
} else {
weprintf(_("Cannot determine your home directory, your"
" user ID is missing from the system's user table."));
/* `errno` can either be set to any number of error codes,
* or be zero if the user does not have a passwd entry */
}
home = "";
}
return home;
#endif
}
/**
* Search for a file and open it in some manner
*
* @param path_spec Specification for the path to try
* @param path_out Output parameter for the found file
* @param pathbuf_out Output parameter for the memory allocation for `*path_out`;
* shall be free(3)d by the caller
* @param open_cb Pointer to function used to open the file, unless it
* returns `NULL` it's return value is returned by the
* function (`try_path`); `NULL` shall be returned if the
* file `path` does not exist
* @return File access object to the found file; `NULL` if not found
*/
static void *
try_path(const struct env_path *path_spec, const char **path_out, char **pathbuf_out, void *(*open_cb)(const char *path))
{
const char *prefix, *p, *q;
char *path;
size_t len;
void *f = NULL;
*path_out = NULL;
*pathbuf_out = NULL;
if (!path_spec->prefix_env) {
prefix = get_home();
} else if (*path_spec->prefix_env) {
prefix = getenv(path_spec->prefix_env);
} else {
f = (*open_cb)(path_spec->suffix);
if (f)
*path_out = path_spec->suffix;
return f;
}
if (!prefix || !*prefix)
return NULL;
path = emalloc(strlen(prefix) + strlen(path_spec->suffix) + 1U);
if (path_spec->multidir_env) {
for (p = prefix; !f && *p; p = &q[!!*q]) {
#ifdef strchrnul
q = strchrnul(p, PATH_DELIMITER);
#else
q = strchr(p, PATH_DELIMITER);
q = q ? q : strchr(p, '\0');
#endif
len = (size_t)(q - p);
if (!len)
continue;
memcpy(path, p, len);
stpcpy(&path[len], path_spec->suffix);
f = (*open_cb)(path);
}
} else {
stpcpy(stpcpy(path, prefix), path_spec->suffix);
f = (*open_cb)(path);
}
if (f)
*path_out = *pathbuf_out = path;
else
free(path);
return f;
}
/**
* Open a file for reading, if it exists
*
* @param path The path to the file
* @return `FILE` object for reading the file,
* `NULL` if it doesn't exist
*/
static void *
open_file(const char *path)
{
FILE *f = fopen(path, "r");
if (!f && errno != ENOENT)
eprintf("fopen %s \"r\":", path);
return f;
}
FILE *
try_path_fopen(const struct env_path *path_spec, const char **path_out, char **pathbuf_out)
{
return try_path(path_spec, path_out, pathbuf_out, &open_file);
}
/**
* Open a directory for reading, if it exists
*
* @param path The path to the directory
* @return `DIR` object for reading the directory,
* `NULL` if it doesn't exist
*/
static void *
open_dir(const char *path)
{
DIR *f = opendir(path);
if (!f && errno != ENOENT)
eprintf("opendir %s:", path);
return f;
}
DIR *
try_path_opendir(const struct env_path *path_spec, const char **path_out, char **pathbuf_out)
{
return try_path(path_spec, path_out, pathbuf_out, &open_dir);
}
#ifndef WINDOWS
void
pipe_rdnonblock(int pipefds[2])
{
int i, flags;
/* Try to use pipe2(2) create O_CLOEXEC pipe */
# if defined(__linux__) && !defined(MISSING_PIPE2)
if (!pipe2(pipefds, O_CLOEXEC))
goto apply_nonblock;
else if (errno != ENOSYS)
eprintf("pipe2 <buffer> O_CLOEXEC:");
# endif
/* Fallback for when pipe2(2) is not available */
if (pipe(pipefds))
eprintf("pipe:");
for (i = 0; i < 2; i++) {
flags = fcntl(pipefds[i], F_GETFD);
if (flags == -1)
eprintf("fcntl <pipe> F_GETFD:");
if (fcntl(pipefds[i], F_SETFD, flags | O_CLOEXEC))
eprintf("fcntl <pipe> F_SETFD +O_CLOEXEC:");
}
/* Make the read-end non-blocking */
# if defined(__linux__) && !defined(MISSING_PIPE2)
apply_nonblock:
# endif
flags = fcntl(pipefds[0], F_GETFL);
if (flags == -1)
eprintf("fcntl <pipe> F_GETFL:");
if (fcntl(pipefds[0], F_SETFL, flags | O_NONBLOCK))
eprintf("fcntl <pipe> F_SETFL +O_NONBLOCK:");
}
#endif
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