Toy elf reader

elf.c

#include <stdio.h>
#include <stdlib.h>
#include "elf.h"

void print_identifer(unsigned char e_ident[EI_NIDENT]){
    printf("%-20s %x | %c%c%c\n", "Magic Header:", e_ident[EI_MAG0], e_ident[EI_MAG1], e_ident[EI_MAG2], e_ident[EI_MAG3]);

    if(e_ident[EI_CLASS] == ELFCLASSNONE){
        printf("%-20s %s", "Class type:", "Gecersiz sinif.");
    }else if(e_ident[EI_CLASS] == ELFCLASS32){
        printf("%-20s %s", "Class type:", "32 Bit sinif.");
    }else if(e_ident[EI_CLASS] == ELFCLASS64){
        printf("%-20s %s", "Class type:", "64 Bit sinif.");
    }
    printf("\n");
}

void print_header(Elf32_Ehdr* file_header){
    print_identifer(file_header->e_ident);
}

int main(int argc, char *argv[]) {
    if(argc < 2){
        fprintf(stderr, "Usage: %s <elf_file>", argv[0]);
        return 1;
    }else{
        FILE* fp = fopen(argv[1], "r");
        if(fp == NULL){
            fprintf(stderr, "No such file '%s'", argv[1]);
            return 1;
        }else{
            Elf32_Ehdr* file_header = (Elf32_Ehdr*)calloc(sizeof(Elf32_Ehdr), 1);
            if(file_header == NULL){
                fprintf(stderr, "Memory allocation error.");
                return 1;
            }else{
                fread(file_header, sizeof(Elf32_Ehdr), 1, fp);
                print_header(file_header);
                free(file_header);
            }
        }
    }
    return 0;
}