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 */
23 #define FB_LIMFD(f) ((struct fb_limfd *)(f)->is_fastbuf)
26 bfl_refill(struct fastbuf *f)
28 int max = MIN(FB_LIMFD(f)->limit - f->pos, f->bufend - f->buffer);
29 int l = read(FB_LIMFD(f)->fd, f->buffer, max);
31 die("Error reading %s: %m", f->name);
33 f->bstop = f->buffer + l;
39 bfl_close(struct fastbuf *f)
45 bfl_config(struct fastbuf *f, uns item, int value)
49 case BCONFIG_CAN_OVERWRITE: ;
50 int old_value = FB_LIMFD(f)->can_overwrite;
51 if (value >= 0 && value <= 2)
52 FB_LIMFD(f)->can_overwrite = value;
60 bopen_limited_fd(int fd, uns buflen, uns limit)
62 struct fb_limfd *F = xmalloc(sizeof(struct fb_limfd) + buflen);
63 struct fastbuf *f = &F->fb;
66 f->buffer = (char *)(F+1);
67 f->bptr = f->bstop = f->buffer;
68 f->bufend = f->buffer + buflen;
69 f->name = "limited-fd";
72 f->refill = bfl_refill;
74 f->config = bfl_config;
81 int main(int argc, char **argv)
83 struct fastbuf *f = bopen_limited_fd(0, 3, 13);
84 struct fastbuf *o = bfdopen_shared(1, 16);
86 while ((c = bgetc(f)) >= 0)