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86 lines
1.6 KiB
86 lines
1.6 KiB
3 months ago
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/*
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* UCW Library -- Null fastbuf
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*
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* (c) 2014 Pavel Charvat <pchar@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/fastbuf.h>
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#include <stdio.h>
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static void fbnull_close(struct fastbuf *b)
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{
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xfree(b);
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}
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struct fastbuf *fbnull_open(uint bufsize)
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{
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struct fastbuf *b = xmalloc(sizeof(*b) + bufsize);
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bzero(b, sizeof(*b));
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b->name = "<fbnull>";
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b->close = fbnull_close;
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fbnull_start(b, (byte *)(b + 1), bufsize);
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return b;
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}
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static int fbnull_refill(struct fastbuf *b UNUSED)
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{
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return 0;
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}
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static void fbnull_spout(struct fastbuf *b)
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{
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b->pos += b->bptr - b->bstop;
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b->bptr = b->bstop;
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}
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static int fbnull_seek(struct fastbuf *b, ucw_off_t pos, int whence)
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{
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b->pos = (whence == SEEK_END) ? 0 : pos;
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b->bptr = b->bstop;
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return 1;
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}
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void fbnull_start(struct fastbuf *b, byte *buf, uint bufsize)
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{
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ASSERT(buf && bufsize);
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b->pos = btell(b);
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b->buffer = b->bptr = b->bstop = buf;
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b->bufend = buf + bufsize;
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b->refill = fbnull_refill;
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b->spout = fbnull_spout;
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b->seek = fbnull_seek;
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b->can_overwrite_buffer = 2;
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}
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bool fbnull_test(struct fastbuf *b)
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{
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return b->refill == fbnull_refill;
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}
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#ifdef TEST
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int main(void)
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{
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struct fastbuf *b = fbnull_open(7);
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for (uint i = 0; i < 100; i++)
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{
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if (btell(b) != i * 10)
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ASSERT(0);
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if (bgetc(b) >= 0)
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ASSERT(0);
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bputs(b, "0123456789");
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bflush(b);
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}
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if (bfilesize(b) != 0)
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ASSERT(0);
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if (btell(b) != 100 * 10)
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ASSERT(0);
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bclose(b);
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return 0;
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}
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#endif
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