/**
* cg-tools -- Cooperative gamma-enabled tools
* Copyright (C) 2016 Mattias Andrée (maandree@kth.se)
*
* 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 "cg-base.h"
#include <libclut.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/**
* The default filter priority for the program
*/
const int64_t default_priority = 0;
/**
* The default class for the program
*/
char default_class[] = PKGNAME "::cg-gamma::standard";
/**
* -d: keep process alive and remove filter on death
*/
static int dflag = 0;
/**
* -x: remove filter rather than adding it
*/
static int xflag = 0;
/**
* -f: gamma listing file
*/
static char* fflag = NULL;
/**
* The gamma of the red channel
*/
static double rgamma = 1;
/**
* The gamma of the green channel
*/
static double ggamma = 1;
/**
* The gamma of the blue channel
*/
static double bgamma = 1;
/**
* `NULL`-terminated list of output
* names listed in the configuration file
*/
static char** names = NULL;
/**
* The gamma of the red channel on monitor
* with same index in `names`
*/
static double* rgammas = NULL;
/**
* The gamma of the green channel on monitor
* with same index in `names`
*/
static double* ggammas = NULL;
/**
* The gamma of the blue channel on monitor
* with same index in `names`
*/
static double* bgammas = NULL;
/**
* Print usage information and exit
*/
void usage(void)
{
fprintf(stderr,
"Usage: %s [-M method] [-S site] [-c crtc]... [-R rule] "
"(-x | [-p priority] [-d] [-f file | all | red green blue])\n",
argv0);
exit(1);
}
/**
* Perform cleanup so valgrind output is clean
*
* @param ret The value to return
* @return `ret` is returned as is
*/
static int cleanup(int ret)
{
int saved_errno = errno;
if (names != NULL)
{
char** p = names;
while (*p)
free(*p++);
}
free(names);
free(rgammas);
free(ggammas);
free(bgammas);
errno = saved_errno;
return ret;
}
/**
* Handle a command line option
*
* @param opt The option, it is a NUL-terminate two-character
* string starting with either '-' or '+', if the
* argument is not recognised, call `usage`. This
* string will not be "-M", "-S", "-c", "-p", or "-R".
* @param arg The argument associated with `opt`,
* `NULL` there is no next argument, if this
* parameter is `NULL` but needed, call `usage`
* @return 0 if `arg` was not used,
* 1 if `arg` was used,
* -1 on error
*/
int handle_opt(char* opt, char* arg)
{
if (opt[0] == '-')
switch (opt[1])
{
case 'd':
if (dflag || xflag)
usage();
dflag = 1;
break;
case 'x':
if (xflag || dflag)
usage();
xflag = 1;
break;
case 'f':
if (fflag || !(fflag = arg))
usage();
return 1;
default:
usage();
}
return 0;
}
/**
* Get the pathname of a configuration file
*
* @param confname The filename (excluding directory) of the configuration file
* @return The full pathname of the configuration file, `NULL` on error
*/
static char* get_conf_file(const char* restrict confname)
{
struct passwd* pw;
char* path;
pw = getpwuid(getuid());
if ((pw == NULL) || (pw->pw_dir == NULL))
return NULL;
path = malloc(strlen(pw->pw_dir) + strlen(confname) + sizeof("/.config/"));
if (path == NULL)
return NULL;
sprintf(path, "%s/.config/%s", pw->pw_dir, confname);
if (access(path, F_OK) < 0)
sprintf(path, "/etc/%s", confname);
return path;
}
/**
* Parse a non-negative double encoded as a string
*
* @param out Output parameter for the value
* @param str The string
* @retunr Zero on success, -1 if the string is invalid
*/
static int parse_double(double* restrict out, const char* restrict str)
{
char* end;
errno = 0;
*out = strtod(str, &end);
if (errno || (*out < 0) || isinf(*out) || isnan(*out) || *end)
return -1;
if (!strchr("0123456789.", *str))
return -1;
return 0;
}
/**
* Parse gamma configuration file
*
* @param pathname The pathname of the file
* @return Zero on success, -1 on error
*/
static int parse_gamma_file(const char* restrict pathname)
{
int fd, saved_errno;
char* line = NULL;
size_t size = 0, lineno = 0, ptr = 0, alloc = 0;
ssize_t n;
FILE* f = NULL;
char* p;
char* q;
char* r;
char* g;
char* b;
fd = open(pathname, O_RDONLY);
if (fd == -1)
return -1;
f = fdopen(fd, "rb");
if (f == NULL)
goto fail;
while (n = getline(&line, &size, f), n >= 0)
{
lineno += 1;
if ((n > 0) && (line[n - 1] == '\n'))
line[n - 1] = '\0';
p = line;
while ((*p == ' ') || (*p == '\t')) p++;
if ((!*p) || (*p == '#'))
continue;
r = strpbrk(line, " \t");
if (r == NULL)
goto bad;
while (r[1] == ' ' || r[1] == '\t') r++;
g = strpbrk(r + 1, " \t");
if (g == NULL)
goto bad;
while (g[1] == ' ' || g[1] == '\t') g++;
b = strpbrk(g + 1, " \t");
if (b == NULL)
goto bad;
while (b[1] == ' ' || b[1] == '\t') b++;
for (;;)
{
q = strpbrk(b + 1, " \t");
if (q == NULL)
break;
while (q[1] == ' ' || q[1] == '\t') q++;
if (!*q)
break;
r = g, g = b, b = q;
}
*r++ = '\0';
*g++ = '\0';
*b++ = '\0';
q = strpbrk(r, " \t");
if (q != NULL)
*q = '\0';
q = strpbrk(g, " \t");
if (q != NULL)
*q = '\0';
q = strpbrk(b, " \t");
if (q != NULL)
*q = '\0';
q = strchr(p, '\0');
while ((q != p) && ((q[-1] == ' ') || (q[-1] == '\t')))
q--;
*q = '\0';
if (ptr == alloc)
{
void* new;
size_t new_size = alloc ? (alloc << 1) : 4;
new = realloc(rgammas, new_size * sizeof(*rgammas));
if (new == NULL)
goto fail;
rgammas = new;
new = realloc(ggammas, new_size * sizeof(*ggammas));
if (new == NULL)
goto fail;
ggammas = new;
new = realloc(bgammas, new_size * sizeof(*bgammas));
if (new == NULL)
goto fail;
bgammas = new;
new = realloc(names, (new_size + 1) * sizeof(*names));
if (new == NULL)
goto fail;
names = new;
memset(names + alloc, 0, (new_size + 1 - alloc) * sizeof(*names));
alloc = new_size;
}
if ((parse_double(rgammas + ptr, r) < 0) ||
(parse_double(ggammas + ptr, g) < 0) ||
(parse_double(bgammas + ptr, b) < 0))
goto bad;
names[ptr] = malloc(strlen(p) + 1);
if (names[ptr] == NULL)
goto fail;
strcpy(names[ptr], p);
ptr++;
continue;
bad:
fprintf(stderr, "%s: ignoring malformatted line in %s: %zu\n", argv0, pathname, lineno);
}
if (fclose(f) < 0)
{
f = NULL;
goto fail;
}
close(fd);
free(line);
return 0;
fail:
saved_errno = errno;
free(line);
if (f != NULL)
fclose(f);
if (fd >= 0)
close(fd);
errno = saved_errno;
return -1;
}
/**
* This function is called after the last
* call to `handle_opt`
*
* @param argc The number of unparsed arguments
* @param argv `NULL` terminated list of unparsed arguments
* @param method The argument associated with the "-M" option
* @param site The argument associated with the "-S" option
* @param crtcs The arguments associated with the "-c" options, `NULL`-terminated
* @param prio The argument associated with the "-p" option
* @param rule The argument associated with the "-R" option
* @return Zero on success, -1 on error
*/
int handle_args(int argc, char* argv[], char* method, char* site,
char** crtcs, char* prio, char* rule)
{
int free_fflag = 0, saved_errno;
int q = xflag + dflag;
q += (method != NULL) && !strcmp(method, "?");
q += (prio != NULL) && !strcmp(prio, "?");
q += (rule != NULL) && (!strcmp(rule, "?") || !strcmp(rule, "??"));
for (; *crtcs; crtcs++)
q += !strcmp(*crtcs, "?");
if ((q > 1) || (fflag && argc) || (xflag && ((fflag != NULL) || (argc > 0) || (prio != NULL))))
usage();
if (argc == 1)
{
if (parse_double(&rgamma, argv[0]) < 0)
usage();
bgamma = ggamma = rgamma;
}
else if (argc == 3)
{
if (parse_double(&rgamma, argv[0]) < 0)
usage();
if (parse_double(&ggamma, argv[1]) < 0)
usage();
if (parse_double(&bgamma, argv[2]) < 0)
usage();
}
else if (argc)
usage();
if (!argc && !fflag && !xflag)
{
fflag = get_conf_file("gamma");
if (fflag == NULL)
return -1;
free_fflag = 1;
}
if (fflag)
if (parse_gamma_file(fflag) < 0)
goto fail;
if (free_fflag)
free(fflag), fflag = NULL;
return 0;
fail:
saved_errno = errno;
if (free_fflag)
free(fflag), fflag = NULL;
errno = saved_errno;
return cleanup(-1);
(void) site;
}
/**
* Fill a filter
*
* @param filter The filter to fill
* @param r The red gamma
* @param g The green gamma
* @param b The blue gamma
*/
static void fill_filter(libcoopgamma_filter_t* restrict filter, double r, double g, double b)
{
switch (filter->depth)
{
#define X(CONST, MEMBER, MAX, TYPE)\
case CONST:\
libclut_gamma(&(filter->ramps.MEMBER), MAX, TYPE, r, g, b);\
break;
LIST_DEPTHS
#undef X
default:
abort();
}
}
/**
* The main function for the program-specific code
*
* @return 0: Success
* -1: Error, `errno` set
* -2: Error, `cg.error` set
* -3: Error, message already printed
*/
int start(void)
{
int r;
size_t i, j;
if (xflag)
for (i = 0; i < crtcs_n; i++)
crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_REMOVE;
else if (dflag)
for (i = 0; i < crtcs_n; i++)
crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_UNTIL_DEATH;
else
for (i = 0; i < crtcs_n; i++)
crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_UNTIL_REMOVAL;
if (!xflag && (names != NULL))
if ((r = make_slaves()) < 0)
return cleanup(r);
if (names == NULL)
for (i = 0, r = 1; i < crtcs_n; i++)
{
if (!(crtc_updates[i].master) || !(crtc_info[i].supported))
continue;
if (!xflag)
fill_filter(&(crtc_updates[i].filter), rgamma, ggamma, bgamma);
r = update_filter(i, 0);
if ((r == -2) || ((r == -1) && (errno != EAGAIN)))
return cleanup(r);
if (crtc_updates[i].slaves != NULL)
for (j = 0; crtc_updates[i].slaves[j] != 0; j++)
{
r = update_filter(crtc_updates[i].slaves[j], 0);
if ((r == -2) || ((r == -1) && (errno != EAGAIN)))
return cleanup(r);
}
}
else
for (i = 0, r = 1; i < crtcs_n; i++)
{
if (!(crtc_info[i].supported))
continue;
for (j = 0; names[j] != NULL; j++)
if (!strcasecmp(crtc_updates[i].filter.crtc, names[j]))
{
fill_filter(&(crtc_updates[i].filter), rgammas[j], ggammas[j], bgammas[j]);
r = update_filter(i, 0);
if ((r == -2) || ((r == -1) && (errno != EAGAIN)))
return cleanup(r);
break;
}
}
while (r != 1)
if ((r = synchronise(-1)) < 0)
return cleanup(r);
if (!dflag)
return cleanup(0);
if (libcoopgamma_set_nonblocking(&cg, 0) < 0)
return cleanup(-1);
for (;;)
if (libcoopgamma_synchronise(&cg, NULL, 0, &j) < 0)
switch (errno)
{
case 0:
break;
case ENOTRECOVERABLE:
goto enotrecoverable;
default:
return cleanup(-1);
}
enotrecoverable:
for (;;)
if (pause() < 0)
return cleanup(-1);
}
