Compilare: user.c: In function ‘main’: user.c:58:5: warning: implicit declaration of function ‘close’ [-Wimplicit-function-declaration] close(in_file); ^ user.c: In function ‘get_content’: user.c:75:9: warning: implicit declaration of function ‘read’ [-Wimplicit-function-declaration] bytes_read = read(in_file, buffer + cbs, BUFFER_SIZE); ^ user.c: In function ‘get_sample’: user.c:114:17: warning: ‘ptr2’ may be used uninitialized in this function [-Wmaybe-uninitialized] size = ptr2 - ptr1 + 1; ^ user.c: In function ‘generate_categories’: user.c:151:35: warning: ‘ghi2’ may be used uninitialized in this function [-Wmaybe-uninitialized] contor = ghi2 - ghi1 - 1; ^