#ifndef HELPERS_H #define HELPERS_H extern int my_getc(int); extern int my_putc(char,int); extern off_t my_ftell(int); extern void *my_malloc(size_t size); #undef getc #define getc my_getc #undef putc #define putc my_putc #undef ftell #define ftell my_ftell #define malloc my_malloc #endif /* HELPERS_H */