chore: Makefile and file structure

.gitignore

@@ -1,3 +1,9 @@
+# ft_nm
+ft_nm
+
+# vim
+*.swp
+
 # ---> C
 # Prerequisites
 *.d

Makefile

@@ -0,0 +1,51 @@
+NAME = ft_nm
+
+SRC_FILES = main.c \
+
+INC_FILES = ft_nm.h \
+
+OBJ_FILES = $(SRC_FILES:.c=.o)
+
+SRC_DIR = src/
+INC_DIR = inc/
+OBJ_DIR = obj/
+
+SRC = $(addprefix $(SRC_DIR), $(SRC_FILES))
+INC = $(addprefix $(INC_DIR), $(INC_FILES))
+OBJ = $(addprefix $(OBJ_DIR), $(OBJ_FILES))
+
+CC = gcc
+
+CFLAGS = -Wall -Werror -Wextra
+
+RED = \033[31m
+GREEN = \033[32m
+YELLOW = \033[33m
+BLUE = \033[34m
+CYAN = \033[36m
+WHITE = \033[0m
+
+all: $(NAME)
+
+$(NAME): $(OBJ) $(INC)
+	@$(CC) $(CFLAGS) -I $(INC_DIR) -c $(SRC)
+	@mv $(OBJ_FILES) $(OBJ_DIR)
+	@$(CC) $(CFLAGS) $(OBJ) -o $(NAME)
+	@echo "$(GREEN)[OK]$(WHITE) $(NAME)"
+
+$(OBJ_DIR)%.o: $(SRC_DIR)%.c
+	@if [ ! -d ./obj ]; then \
+		mkdir -p ./obj; \
+	fi;
+	@$(CC) $(CFLAGS) -I $(INC_DIR) -o $@ -c $<
+	@echo "$(CYAN)[CC]$(WHITE) $<"
+
+clean:
+	@rm -rf $(OBJ)
+
+fclean: clean
+	@rm -f $(NAME)
+
+re: fclean all
+
+.PHONY: all clean fclean re

inc/ft_nm.h

@@ -0,0 +1,10 @@
+#ifndef _FT_NM_H
+# define _FT_NM_H
+
+# include <unistd.h>
+# include <sys/mman.h>
+# include <fcntl.h>
+# include <elf.h>
+# include <stdio.h>
+
+#endif

src/main.c

@@ -0,0 +1,26 @@
+#include "ft_nm.h"
+
+int main(void) {
+	int fd = open("ft_nm", O_RDONLY);
+	void *ptr = NULL;
+	Elf64_Ehdr *header;
+
+	ptr = mmap(NULL, 64, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (ptr != MAP_FAILED) {
+		header = (Elf64_Ehdr *)ptr;
+		write(1, ptr, 4);
+		write(1, "\n", 1);
+		write(1, header->e_ident, 4);
+		write(1, "\n", 1);
+		if (header->e_ident[EI_OSABI] == 0x00) {
+			printf("This ELF is for System V! :)\n");
+		}
+		else if (header->e_ident[EI_OSABI] == 0x03) {
+			printf("This ELF is for linux! :)\n");
+		} else {
+			printf("What's my purpose :(\n");
+		}
+	}
+
+	return 0;
+}