2 * Sherlock Library -- Fast File Buffering
4 * (c) 1997--1999 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
17 struct fastbuf *__bfdopen(int fd, uns buffer, byte *name)
19 struct fastbuf *b = xmalloc(sizeof(struct fastbuf));
22 b->buffer = xmalloc(buffer);
23 b->bptr = b->bstop = b->buffer;
24 b->bufend = b->buffer + buffer;
25 b->name = stralloc(name);
26 b->pos = b->fdpos = 0;
32 bopen(byte *name, uns mode, uns buffer)
36 #ifdef SHERLOCK_CONFIG_LFS
39 fd = open(name, mode, 0666);
42 die("Unable to %s file %s: %m",
43 (mode & O_CREAT) ? "create" : "open", name);
44 return __bfdopen(fd, buffer, name);
48 bfdopen(int fd, uns buffer)
52 sprintf(x, "fd%d", fd);
53 return __bfdopen(fd, buffer, x);
56 void bclose(struct fastbuf *f)
66 rdbuf(struct fastbuf *f)
68 int l = read(f->fd, f->buffer, f->buflen);
71 die("Error reading %s: %m", f->name);
73 f->bstop = f->buffer + l;
80 wrbuf(struct fastbuf *f)
82 int l = f->bptr - f->buffer;
86 if (write(f->fd, f->buffer, l) != l)
87 die("Error writing %s: %m", f->name);
94 void bflush(struct fastbuf *f)
96 if (f->bptr != f->buffer)
97 { /* Have something to flush */
98 if (f->bstop > f->buffer) /* Read data? */
100 f->bptr = f->bstop = f->buffer;
103 else /* Write data... */
108 inline void bsetpos(struct fastbuf *f, sh_off_t pos)
110 if (pos >= f->pos && (pos <= f->pos + (f->bptr - f->buffer) || pos <= f->pos + (f->bstop - f->buffer)))
111 f->bptr = f->buffer + (pos - f->pos);
115 if (f->fdpos != pos && sh_seek(f->fd, pos, SEEK_SET) < 0)
116 die("lseek on %s: %m", f->name);
117 f->fdpos = f->pos = pos;
121 void bseek(struct fastbuf *f, sh_off_t pos, int whence)
128 return bsetpos(f, pos);
130 return bsetpos(f, btell(f) + pos);
133 l = sh_seek(f->fd, pos, whence);
135 die("lseek on %s: %m", f->name);
136 f->fdpos = f->pos = l;
139 die("bseek: invalid whence=%d", whence);
143 int bgetc_slow(struct fastbuf *f)
145 if (f->bptr < f->bstop)
152 int bpeekc_slow(struct fastbuf *f)
154 if (f->bptr < f->bstop)
161 void bputc_slow(struct fastbuf *f, byte c)
163 if (f->bptr >= f->bufend)
168 word bgetw_slow(struct fastbuf *f)
170 word w = bgetc_slow(f);
171 #ifdef CPU_BIG_ENDIAN
172 return (w << 8) | bgetc_slow(f);
174 return w | (bgetc_slow(f) << 8);
178 u32 bgetl_slow(struct fastbuf *f)
180 u32 l = bgetc_slow(f);
181 #ifdef CPU_BIG_ENDIAN
182 l = (l << 8) | bgetc_slow(f);
183 l = (l << 8) | bgetc_slow(f);
184 return (l << 8) | bgetc_slow(f);
186 l = (bgetc_slow(f) << 8) | l;
187 l = (bgetc_slow(f) << 16) | l;
188 return (bgetc_slow(f) << 24) | l;
192 u64 bgetq_slow(struct fastbuf *f)
195 #ifdef CPU_BIG_ENDIAN
202 return ((u64) h << 32) | l;
205 u64 bget5_slow(struct fastbuf *f)
208 #ifdef CPU_BIG_ENDIAN
215 return ((u64) h << 32) | l;
218 void bputw_slow(struct fastbuf *f, word w)
220 #ifdef CPU_BIG_ENDIAN
221 bputc_slow(f, w >> 8);
225 bputc_slow(f, w >> 8);
229 void bputl_slow(struct fastbuf *f, u32 l)
231 #ifdef CPU_BIG_ENDIAN
232 bputc_slow(f, l >> 24);
233 bputc_slow(f, l >> 16);
234 bputc_slow(f, l >> 8);
238 bputc_slow(f, l >> 8);
239 bputc_slow(f, l >> 16);
240 bputc_slow(f, l >> 24);
244 void bputq_slow(struct fastbuf *f, u64 q)
246 #ifdef CPU_BIG_ENDIAN
247 bputl_slow(f, q >> 32);
251 bputl_slow(f, q >> 32);
255 void bput5_slow(struct fastbuf *f, u64 o)
259 #ifdef CPU_BIG_ENDIAN
268 void bread_slow(struct fastbuf *f, void *b, uns l)
272 uns k = f->bstop - f->bptr;
277 k = f->bstop - f->bptr;
279 die("bread on %s: file exhausted", f->name);
283 memcpy(b, f->bptr, k);
290 void bwrite_slow(struct fastbuf *f, void *b, uns l)
294 uns k = f->bufend - f->bptr;
299 k = f->bufend - f->bptr;
303 memcpy(f->bptr, b, k);
310 byte * /* Non-standard */
311 bgets(struct fastbuf *f, byte *b, uns l)
321 if (k == '\n' || k == EOF)
329 die("%s: Line too long", f->name);
332 void bbcopy(struct fastbuf *f, struct fastbuf *t, uns l)
334 uns rf = f->bstop - f->bptr;
340 uns k = (rf <= l) ? rf : l;
341 bwrite(t, f->bptr, k);
345 while (l >= t->buflen)
348 if ((uns) read(f->fd, t->buffer, t->buflen) != t->buflen)
349 die("bbcopy: %s exhausted", f->name);
351 f->fdpos += t->buflen;
352 f->bstop = f->bptr = f->buffer;
358 uns k = t->bufend - t->bptr;
363 k = t->bufend - t->bptr;
367 bread(f, t->bptr, k);
375 int main(int argc, char **argv)
377 struct fastbuf *f, *t;
380 f = bopen("/etc/profile", O_RDONLY, 16);