substdio_copy.c

linux下qmail的源码 本人加了一些注释

#include "substdio.h"

int substdio_copy(ssout,ssin)
register substdio *ssout;
register substdio *ssin;
{
  register int n;
  register char *x;

  for (;;) {
    n = substdio_feed(ssin);
    if (n < 0) return -2;
    if (!n) return 0;
    x = substdio_PEEK(ssin);
    if (substdio_put(ssout,x,n) == -1) return -3;
    substdio_SEEK(ssin,n);
  }
}