first commit

.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug",
+            "type": "cppdbg",
+            "request": "launch",
+            "args": [],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}",
+            "environment": [],
+            "externalConsole": false,
+            "linux": {
+                "MIMode": "gdb",
+                "miDebuggerPath": "gdb",
+                "program": "${workspaceFolder}/output/main"
+            },
+            "osx": {
+                "MIMode": "lldb",
+                "miDebuggerPath": "lldb-mi",
+                "program": "${workspaceFolder}/output/main"
+            },
+            "windows": {
+                "MIMode": "gdb",
+                "miDebuggerPath": "gdb.exe",
+                "program": "${workspaceFolder}/output/main.exe"
+            },
+            "preLaunchTask": "build"
+        }
+    ]
+}

.vscode/tasks.json

@@ -0,0 +1,84 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "type": "shell",
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "windows": {
+                "command": "powershell",
+                "args": [
+                    "-c",
+                    "mingw32-make"
+                ]
+            },
+            "linux": {
+                "command": "bash",
+                "args": [
+                    "-c",
+                    "make"
+                ]
+            },
+            "osx": {
+                "command": "bash",
+                "args": [
+                    "-c",
+                    "make"
+                ]
+            }
+        },
+        {
+            "label": "build & run",
+            "type": "shell",
+            "windows": {
+                "command": "powershell",
+                "args": [
+                    "-c",
+                    "'mingw32-make run'"
+                ]
+            },
+            "linux": {
+                "command": "bash",
+                "args": [
+                    "-c",
+                    "'make run'"
+                ]
+            },
+            "osx": {
+                "command": "bash",
+                "args": [
+                    "-c",
+                    "'make run'"
+                ]
+            }
+        },
+        {
+            "label": "clean",
+            "type": "shell",
+            "windows": {
+                "command": "powershell",
+                "args": [
+                    "-c",
+                    "'mingw32-make clean'"
+                ]
+            },
+            "linux": {
+                "command": "bash",
+                "args": [
+                    "-c",
+                    "'make clean'"
+                ]
+            },
+            "osx": {
+                "command": "bash",
+                "args": [
+                    "-c",
+                    "'make clean'"
+                ]
+            }
+        }
+    ]
+}

Makefile

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+#
+# 'make'        build executable file 'main'
+# 'make clean'  removes all .o and executable files
+#
+
+# define the C compiler to use
+CC = gcc
+
+# define any compile-time flags
+CFLAGS	:= -Wall -Wextra -g
+
+# define library paths in addition to /usr/lib
+#   if I wanted to include libraries not in /usr/lib I'd specify
+#   their path using -Lpath, something like:
+LFLAGS =
+
+# define output directory
+OUTPUT	:= output
+
+# define source directory
+SRC		:= src
+
+# define include directory
+INCLUDE	:= include
+
+# define lib directory
+LIB		:= lib
+
+ifeq ($(OS),Windows_NT)
+MAIN	:= main.exe
+SOURCEDIRS	:= $(SRC)
+INCLUDEDIRS	:= $(INCLUDE)
+LIBDIRS		:= $(LIB)
+FIXPATH = $(subst /,\,$1)
+RM			:= del /q /f
+MD	:= mkdir
+else
+MAIN	:= main
+SOURCEDIRS	:= $(shell find $(SRC) -type d)
+INCLUDEDIRS	:= $(shell find $(INCLUDE) -type d)
+LIBDIRS		:= $(shell find $(LIB) -type d)
+FIXPATH = $1
+RM = rm -f
+MD	:= mkdir -p
+endif
+
+# define any directories containing header files other than /usr/include
+INCLUDES	:= $(patsubst %,-I%, $(INCLUDEDIRS:%/=%))
+
+# define the C libs
+LIBS		:= $(patsubst %,-L%, $(LIBDIRS:%/=%))
+
+# define the C source files
+SOURCES		:= $(wildcard $(patsubst %,%/*.c, $(SOURCEDIRS)))
+
+# define the C object files 
+OBJECTS		:= $(SOURCES:.c=.o)
+
+# define the dependency output files
+DEPS		:= $(OBJECTS:.o=.d)
+
+#
+# The following part of the makefile is generic; it can be used to 
+# build any executable just by changing the definitions above and by
+# deleting dependencies appended to the file from 'make depend'
+#
+
+OUTPUTMAIN	:= $(call FIXPATH,$(OUTPUT)/$(MAIN))
+
+all: $(OUTPUT) $(MAIN)
+	@echo Executing 'all' complete!
+
+$(OUTPUT):
+	$(MD) $(OUTPUT)
+
+$(MAIN): $(OBJECTS) 
+	$(CC) $(CFLAGS) $(INCLUDES) -o $(OUTPUTMAIN) $(OBJECTS) $(LFLAGS) $(LIBS)
+
+# include all .d files
+-include $(DEPS)
+
+# this is a suffix replacement rule for building .o's and .d's from .c's
+# it uses automatic variables $<: the name of the prerequisite of
+# the rule(a .c file) and $@: the name of the target of the rule (a .o file) 
+# -MMD generates dependency output files same name as the .o file
+# (see the gnu make manual section about automatic variables)
+.c.o:
+	$(CC) $(CFLAGS) $(INCLUDES) -c -MMD $<  -o $@
+
+.PHONY: clean
+clean:
+	$(RM) $(OUTPUTMAIN)
+	$(RM) $(call FIXPATH,$(OBJECTS))
+	$(RM) $(call FIXPATH,$(DEPS))
+	@echo Cleanup complete!
+
+run: all
+	./$(OUTPUTMAIN)
+	@echo Executing 'run: all' complete!

include/users.h

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+#include <stdint.h>
+#include <time.h>
+
+#ifndef __USERS_H__
+#define __USERS_H__
+
+typedef struct person
+{
+    uint16_t uuid;
+
+    char *name;
+    char *surname;
+    uint8_t department;
+
+    time_t last_timestamp;
+    uint32_t total;
+} person_t;
+
+typedef struct node
+{
+    person_t user;
+    struct node *next;
+} node_t;
+
+#endif

src/main.c

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+#include <stdio.h>
+#include "users.h"
+
+int main(int argc, char const *argv[])
+{
+
+    return 0;
+}

src/users.c

@@ -0,0 +1 @@
+#include "users.h"