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GNU GENERAL PUBLIC LICENSE
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#Copyright 2018 Rexy712 of Rexy & Co
#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/>.
#Makefile for project rex-edid
#Project directory and file setup
SOURCE_DIRS:=src
OBJDIR:=obj
DEPDIR:=obj/dep
INCLUDE_DIRS:=include
EXT:=c
MAIN_EXECUTABLE:=rex-edid
#Compiler/Linker setup
CC:=gcc
CFLAGS:=-x c -g -std=c11 -Wall -pedantic -Wextra
release: CFLAGS+=-O2
LDFLAGS=
LDLIBS:=-lxcb -lxcb-randr
STRIP:=strip
mkdir=mkdir -p $(1)
rm=rm -f $(1)
rmdir=rm -rf $(1)
move=mv $(1) $(2)
#Internal management of sources/objects and additional cflags
INTERNAL_CFLAGS=-c $(foreach dir,$(INCLUDE_DIRS),-I"$(dir)") -MMD -MP -MF"$(DEPDIR)/$(notdir $(subst .o,.d,$@))"
SOURCES:=$(foreach source,$(SOURCE_DIRS),$(foreach ext,$(EXT),$(wildcard $(source)/*.$(ext))))
OBJECTS:=$(addprefix $(OBJDIR)/,$(subst \,.,$(subst /,.,$(addsuffix .o,$(SOURCES)))))
all: $(MAIN_EXECUTABLE)
$(MAIN_EXECUTABLE): $(OBJECTS)
$(CC) $(LDFLAGS) $^ -o "$(basename $@)" $(LDLIBS)
.PHONY: release
release: $(OBJECTS)
$(CC) $(LDFLAGS) $^ -o "$(basename $(MAIN_EXECUTABLE))" $(LDLIBS)
$(STRIP) --strip-all "$(MAIN_EXECUTABLE)"
define GENERATE_OBJECTS
$$(OBJDIR)/$(subst \,.,$(subst /,.,$(1))).%.o: $(1)/%
$$(CC) $$(CFLAGS) $$(INTERNAL_CFLAGS) "$$<" -o "$$@"
endef
$(foreach dir,$(SOURCE_DIRS),$(eval $(call GENERATE_OBJECTS,$(dir))))
$(OBJECTS): | $(OBJDIR) $(DEPDIR)
$(OBJDIR):
$(call mkdir,"$@")
$(DEPDIR):
$(call mkdir,"$@")
.PHONY: clean
clean:
$(call rmdir,"$(DEPDIR)")
$(call rmdir,"$(OBJDIR)")
$(call rm,"$(MAIN_EXECUTABLE)")
-include $(wildcard $(DEPDIR)/*.d)

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/*
rex-edid extracts the EDID data and corresponding display name from the X server
Copyright (C) 2018 rexy712
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/>.
*/
#include <xcb/xcb.h>
#include <xcb/randr.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define EDID_OFFSET 7
#define RANDR_MIN_VER_MAJ 1u
#define RANDR_MIN_VER_MIN 3u
struct edid{
union{
uint8_t header_bits[8];
uint64_t header;
};
uint16_t vendor;
uint16_t product;
uint32_t serial;
uint8_t manufacture_week;
uint8_t manufacture_year;
uint8_t edid_version_major;
uint8_t edid_version_minor;
uint8_t video_flags;
uint8_t horizontal_size;
uint8_t vertical_size;
uint8_t gamma;
uint8_t video_features;
uint8_t chromaticity[10];
uint8_t established_timing[3];
uint8_t standard_timing[8];
};
typedef struct edid edid;
/*return 0 if we have a good version*/
int check_randr_version(xcb_connection_t* connection, int* maj, int* min){
xcb_randr_query_version_cookie_t cookie;
xcb_generic_error_t* err;
xcb_randr_query_version_reply_t* reply;
int retval = 0;
cookie = xcb_randr_query_version(connection, RANDR_MIN_VER_MAJ, RANDR_MIN_VER_MIN);
reply = xcb_randr_query_version_reply(connection, cookie, &err);
if(err){
fprintf(stderr, "An error occurred while checking RandR version!\n");
free(reply);
return 2;
}
if(min)
*min = reply->minor_version;
if(maj)
*maj = reply->major_version;
if(reply->major_version < RANDR_MIN_VER_MAJ ||
(reply->major_version == RANDR_MIN_VER_MAJ && reply->minor_version > RANDR_MIN_VER_MIN)){
retval = 1;
}
free(reply);
return retval;
}
/*get the screen we want to work with*/
xcb_screen_t* get_screen(xcb_connection_t* connection, int screen_num){
int i;
xcb_screen_iterator_t iter = xcb_setup_roots_iterator(xcb_get_setup(connection));
for(i = 0;i < screen_num;++i){
xcb_screen_next(&iter);
}
return iter.data;
}
xcb_window_t get_screen_root_window(xcb_connection_t* connection, int screen_num){
return get_screen(connection, screen_num)->root;
}
_Noreturn void help(int ret){
printf("rex-edid is a utility to extract the EDID of all the connected displays.\n");
printf("It was made from a desire for a simpler way to extract the info than parsing the output of `xrandr --props`\n");
printf("\n");
printf("Usage: rex-edid [--help]\n");
printf("\n");
printf("Options:\n");
printf("%-20s%s\n", "\t--help|-h", "show this help message");
printf("\n");
printf("rex-edid Copyright (C) 2018 rexy712\n");
printf("This program comes with ABSOLUTELY NO WARRANTY; for details type refer to the LICENSE file.\n");
printf("This is free software, and you are welcome to redistribute it\n");
printf("under certain conditions; see the LICENSE file for details.\n");
exit(ret);
}
int main(int argc, char* argv[]){
xcb_connection_t* connection; /*connection to x server*/
xcb_window_t root; /*handle on root window of screen???*/
xcb_timestamp_t timestamp; /*timestamp of resource reply???*/
xcb_randr_output_t* randr_outputs; /*list of RandR outputs*/
int num_randr_outputs, /*number of RandR outputs in list*/
screen_num, /*number of starting screen on server*/
randr_ver_min, /*return location for RandR version*/
randr_ver_maj; /*see above*/
int i; /*counter*/
xcb_randr_get_screen_resources_current_reply_t* randr_resources_reply; /*X server reply to our resource query*/
for(i = 1;i < argc;++i){
if(!strcmp(argv[i], "--help") || !strcmp(argv[i], "-h"))
help(0);
else{
fprintf(stderr, "Unrecognized option '%s'\n", argv[i]);
help(1);
}
}
/*initialize connection to x server*/
connection = xcb_connect(NULL, &screen_num);
if(xcb_connection_has_error(connection)){
fprintf(stderr, "Unable to open connection to X server!\n");
return -1;
}
if(check_randr_version(connection, &randr_ver_maj, &randr_ver_min)){
xcb_disconnect(connection);
fprintf(stderr, "RandR version %d.%d is too old!\nMust have at least RandR version %u.%u\n", randr_ver_maj, randr_ver_min, RANDR_MIN_VER_MAJ, RANDR_MIN_VER_MIN);
return -1;
}
/*get all this bs so we can get what we actually want*/
root = get_screen_root_window(connection, screen_num);
randr_resources_reply = xcb_randr_get_screen_resources_current_reply(connection, xcb_randr_get_screen_resources_current(connection, root), NULL);
timestamp = randr_resources_reply->config_timestamp;
/*number of displays*/
num_randr_outputs = xcb_randr_get_screen_resources_current_outputs_length(randr_resources_reply);
/*list of displays*/
randr_outputs = xcb_randr_get_screen_resources_current_outputs(randr_resources_reply);
for(i = 0;i < num_randr_outputs;++i){
xcb_randr_get_output_info_reply_t* output_info_reply;
xcb_randr_list_output_properties_reply_t* output_list_prop_reply;
xcb_randr_get_output_property_reply_t* output_get_prop_reply;
xcb_get_atom_name_reply_t* atom_name_reply;
xcb_atom_t* output_atoms;
int num_atoms;
int j;
uint8_t* prop_data;
/*get output properties list(which includes the atoms)*/
output_list_prop_reply = xcb_randr_list_output_properties_reply(connection, xcb_randr_list_output_properties(connection, randr_outputs[i]), NULL);
/*get list of atoms (which includes EDID)*/
output_atoms = xcb_randr_list_output_properties_atoms(output_list_prop_reply);
num_atoms = xcb_randr_list_output_properties_atoms_length(output_list_prop_reply);
for(j = 0;j < num_atoms;++j){
unsigned int k;
/*get atom_name*/
atom_name_reply = xcb_get_atom_name_reply(connection, xcb_get_atom_name(connection, output_atoms[j]), NULL);
/*if the atom is the EDID data, we want to get it*/
if(!memcmp(xcb_get_atom_name_name(atom_name_reply), "EDID", 4)){
/*get output name*/
output_info_reply = xcb_randr_get_output_info_reply(connection, xcb_randr_get_output_info(connection, randr_outputs[i], timestamp), NULL);
printf("%s:", xcb_randr_get_output_info_name(output_info_reply));
/*get property data for the current atom*/
output_get_prop_reply = xcb_randr_get_output_property_reply(connection, xcb_randr_get_output_property(connection, randr_outputs[i], output_atoms[j], XCB_GET_PROPERTY_TYPE_ANY, 0, 100, 0, 0), NULL);
prop_data = xcb_randr_get_output_property_data(output_get_prop_reply);
/*print out the EDID in hex (starts at an offset)*/
for(k = EDID_OFFSET;k < output_get_prop_reply->num_items;++k){
printf("%02x", prop_data[k]);
}
printf("\n");
free(output_info_reply);
free(output_get_prop_reply);
}
free(atom_name_reply);
}
free(output_list_prop_reply);
}
free(randr_resources_reply);
xcb_disconnect(connection);
}