Gute API vs. Schlechte API
   Schlecht:
int i;
char buf[100];
sprintf(buf,"the number is %d",i);
   Gut:
stralloc s={0};
stralloc_copys(&s,"the number is ");
stralloc_catuint(&s,i);

                  Gute API vs. Schlechte API
   Schlecht:
int fd=open("foo",O_WRONLY|O_CREAT,0600);
   Gut:
int fd=open_write("foo");