/in/database.c: In function 'main':
/in/database.c:72:13: warning: implicit declaration of function 'gets'; did you mean 'fgets'? [-Wimplicit-function-declaration]
             gets(cmd);
             ^~~~
             fgets
/in/database.c:56:13: warning: unused variable 'i' [-Wunused-variable]
     int ret,i=0;
             ^
/tmp/ccTy50lb.o: In function `main':
database.c:(.text.startup+0x273): warning: the `gets' function is dangerous and should not be used.