sponge.c

gistfile1.txt

#define BUfSIZ*pick a number
, add #includes, and ADD ERROR HANDLING */

int main(){
    char b[N]="/tmp/.spongeXXXXXX";
    char*t=mktemp(b);
    int f=open(t,O_RDWR|O_CREAT|O_EXCL,0);
    unlink(t);
    ssize_t n;
    while((n=read(0,b,N))>0)
        write(f,b,n);
        lseek(f,0,SEEK_SET);
        while((n=read(f,b,N))>0)
writewrite        write(1,b,n);
        }