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)
34 int fd = sh_open(name, mode, 0666);
36 die("Unable to %s file %s: %m",
37 (mode & O_CREAT) ? "create" : "open", name);
38 return __bfdopen(fd, buffer, name);
42 bfdopen(int fd, uns buffer)
46 sprintf(x, "fd%d", fd);
47 return __bfdopen(fd, buffer, x);
50 void bclose(struct fastbuf *f)
60 rdbuf(struct fastbuf *f)
62 int l = read(f->fd, f->buffer, f->buflen);
65 die("Error reading %s: %m", f->name);
67 f->bstop = f->buffer + l;
74 wrbuf(struct fastbuf *f)
76 int l = f->bptr - f->buffer;
81 int z = write(f->fd, c, l);
83 die("Error writing %s: %m", f->name);
86 log(L_ERROR "wrbuf: %d != %d (pos %Ld)", z, l, sh_seek(f->fd, 0, SEEK_CUR));
95 void bflush(struct fastbuf *f)
97 if (f->bptr != f->buffer)
98 { /* Have something to flush */
99 if (f->bstop > f->buffer) /* Read data? */
101 f->bptr = f->bstop = f->buffer;
104 else /* Write data... */
109 inline void bsetpos(struct fastbuf *f, sh_off_t pos)
111 if (pos >= f->pos && (pos <= f->pos + (f->bptr - f->buffer) || pos <= f->pos + (f->bstop - f->buffer)))
112 f->bptr = f->buffer + (pos - f->pos);
116 if (f->fdpos != pos && sh_seek(f->fd, pos, SEEK_SET) < 0)
117 die("lseek on %s: %m", f->name);
118 f->fdpos = f->pos = pos;
122 void bseek(struct fastbuf *f, sh_off_t pos, int whence)
129 return bsetpos(f, pos);
131 return bsetpos(f, btell(f) + pos);
134 l = sh_seek(f->fd, pos, whence);
136 die("lseek on %s: %m", f->name);
137 f->fdpos = f->pos = l;
140 die("bseek: invalid whence=%d", whence);
144 int bgetc_slow(struct fastbuf *f)
146 if (f->bptr < f->bstop)
153 int bpeekc_slow(struct fastbuf *f)
155 if (f->bptr < f->bstop)
162 void bputc_slow(struct fastbuf *f, byte c)
164 if (f->bptr >= f->bufend)
169 word bgetw_slow(struct fastbuf *f)
171 word w = bgetc_slow(f);
172 #ifdef CPU_BIG_ENDIAN
173 return (w << 8) | bgetc_slow(f);
175 return w | (bgetc_slow(f) << 8);
179 u32 bgetl_slow(struct fastbuf *f)
181 u32 l = bgetc_slow(f);
182 #ifdef CPU_BIG_ENDIAN
183 l = (l << 8) | bgetc_slow(f);
184 l = (l << 8) | bgetc_slow(f);
185 return (l << 8) | bgetc_slow(f);
187 l = (bgetc_slow(f) << 8) | l;
188 l = (bgetc_slow(f) << 16) | l;
189 return (bgetc_slow(f) << 24) | l;
193 u64 bgetq_slow(struct fastbuf *f)
196 #ifdef CPU_BIG_ENDIAN
203 return ((u64) h << 32) | l;
206 u64 bget5_slow(struct fastbuf *f)
209 #ifdef CPU_BIG_ENDIAN
216 return ((u64) h << 32) | l;
219 void bputw_slow(struct fastbuf *f, word w)
221 #ifdef CPU_BIG_ENDIAN
222 bputc_slow(f, w >> 8);
226 bputc_slow(f, w >> 8);
230 void bputl_slow(struct fastbuf *f, u32 l)
232 #ifdef CPU_BIG_ENDIAN
233 bputc_slow(f, l >> 24);
234 bputc_slow(f, l >> 16);
235 bputc_slow(f, l >> 8);
239 bputc_slow(f, l >> 8);
240 bputc_slow(f, l >> 16);
241 bputc_slow(f, l >> 24);
245 void bputq_slow(struct fastbuf *f, u64 q)
247 #ifdef CPU_BIG_ENDIAN
248 bputl_slow(f, q >> 32);
252 bputl_slow(f, q >> 32);
256 void bput5_slow(struct fastbuf *f, u64 o)
260 #ifdef CPU_BIG_ENDIAN
269 void bread_slow(struct fastbuf *f, void *b, uns l)
273 uns k = f->bstop - f->bptr;
278 k = f->bstop - f->bptr;
280 die("bread on %s: file exhausted", f->name);
284 memcpy(b, f->bptr, k);
291 void bwrite_slow(struct fastbuf *f, void *b, uns l)
295 uns k = f->bufend - f->bptr;
300 k = f->bufend - f->bptr;
304 memcpy(f->bptr, b, k);
311 byte * /* Non-standard */
312 bgets(struct fastbuf *f, byte *b, uns l)
322 if (k == '\n' || k == EOF)
330 die("%s: Line too long", f->name);
333 void bbcopy(struct fastbuf *f, struct fastbuf *t, uns l)
335 uns rf = f->bstop - f->bptr;
341 uns k = (rf <= l) ? rf : l;
342 bwrite(t, f->bptr, k);
346 while (l >= t->buflen)
349 if ((uns) read(f->fd, t->buffer, t->buflen) != t->buflen)
350 die("bbcopy: %s exhausted", f->name);
352 f->fdpos += t->buflen;
353 f->bstop = f->bptr = f->buffer;
359 uns k = t->bufend - t->bptr;
364 k = t->bufend - t->bptr;
368 bread(f, t->bptr, k);
376 int main(int argc, char **argv)
378 struct fastbuf *f, *t;
381 f = bopen("/etc/profile", O_RDONLY, 16);