?? substdi.c
字號:
#include "substdio.h"#include "byte.h"#include "error.h"static int oneread(op,fd,buf,len)register int (*op)();register int fd;register char *buf;register int len;{ register int r; for (;;) { r = op(fd,buf,len); if (r == -1) if (errno == error_intr) continue; return r; }}static int getthis(s,buf,len)register substdio *s;register char *buf;register int len;{ register int r; register int q; r = s->p; q = r - len; if (q > 0) { r = len; s->p = q; } else s->p = 0; byte_copy(buf,r,s->x + s->n); s->n += r; return r;}int substdio_feed(s)register substdio *s;{ register int r; register int q; if (s->p) return s->p; q = s->n; r = oneread(s->op,s->fd,s->x,q); if (r <= 0) return r; s->p = r; q -= r; s->n = q; if (q > 0) /* damn, gotta shift */ byte_copyr(s->x + q,r,s->x); return r;}int substdio_bget(s,buf,len)register substdio *s;register char *buf;register int len;{ register int r; if (s->p > 0) return getthis(s,buf,len); r = s->n; if (r <= len) return oneread(s->op,s->fd,buf,r); r = substdio_feed(s); if (r <= 0) return r; return getthis(s,buf,len);}int substdio_get(s,buf,len)register substdio *s;register char *buf;register int len;{ register int r; if (s->p > 0) return getthis(s,buf,len); if (s->n <= len) return oneread(s->op,s->fd,buf,len); r = substdio_feed(s); if (r <= 0) return r; return getthis(s,buf,len);}char *substdio_peek(s)register substdio *s;{ return s->x + s->n;}void substdio_seek(s,len)register substdio *s;register int len;{ s->n += len; s->p -= len;}
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