2 * Sherlock Library -- Fast Buffered Input on Limited File Descriptors
4 * (c) 2003 Martin Mares <mj@ucw.cz>
5 * (c) 2004 Robert Spalek <robert@ucw.cz>
7 * This software may be freely distributed and used according to the terms
8 * of the GNU Lesser General Public License.
12 #include "lib/fastbuf.h"
19 int fd; /* File descriptor */
22 #define FB_LIMFD(f) ((struct fb_limfd *)(f)->is_fastbuf)
25 bfl_refill(struct fastbuf *f)
27 int max = MIN(FB_LIMFD(f)->limit - f->pos, f->bufend - f->buffer);
28 int l = read(FB_LIMFD(f)->fd, f->buffer, max);
30 die("Error reading %s: %m", f->name);
32 f->bstop = f->buffer + l;
38 bfl_close(struct fastbuf *f)
44 bopen_limited_fd(int fd, uns buflen, uns limit)
46 struct fb_limfd *F = xmalloc(sizeof(struct fb_limfd) + buflen);
47 struct fastbuf *f = &F->fb;
50 f->buffer = (char *)(F+1);
51 f->bptr = f->bstop = f->buffer;
52 f->bufend = f->buffer + buflen;
53 f->name = "limited-fd";
56 f->refill = bfl_refill;
58 f->can_overwrite_buffer = 2;
64 int main(int argc, char **argv)
66 struct fastbuf *f = bopen_limited_fd(0, 3, 13);
67 struct fastbuf *o = bfdopen_shared(1, 16);
69 while ((c = bgetc(f)) >= 0)