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#include "parse.h"
size_t bs_skip(struct bytestream* bs, size_t len) {
size_t n;
if (bs->cur >= bs->max)
return 0;
n = bs->max - bs->cur;
if (len > n) {
bs->max = 0; // set error
bs->cur = 1;
return 0;
}
switch (bs->type) {
case MEMBUF:
bs->cur += len;
break;
case IOBUF:
bs->cur += len;
return buffer_seek(bs->u.b, len);
case BSTREAM:
bs->cur += len;
return bs_skip(bs->u.bs, len);
}
return len;
}
#ifdef UNITTEST
#include <assert.h>
#include <signal.h>
#undef UNITTEST
#include "buffer/bs_init_membuf.c"
#include "buffer/bs_err.c"
#include "buffer/bs_get.c"
#include "buffer/buffer_getc.c"
#include "buffer/buffer_seek.c"
#include "buffer/buffer_feed.c"
#include "buffer/buffer_stubborn2.c"
#include "buffer/bs_init_iobuf.c"
#include "open/open_read.c"
#include "buffer/prs_readblob.c"
#include "buffer/buffer_get.c"
#include "buffer/bs_capacityassert.c"
#include "byte/byte_copy.c"
#include "buffer/buffer_init.c"
int main() {
struct bytestream bs;
// test basic functionality inside buffer with known length
bs_init_membuf(&bs, "fnord\n", 7);
assert(bs_skip(&bs, 0) == 0);
assert(bs_err(&bs) == 0);
assert(bs_skip(&bs, 5) == 5);
assert(bs_err(&bs) == 0);
assert(bs_get(&bs) == '\n');
assert(bs_skip(&bs, 100) == 0);
assert(bs_err(&bs));
// test basic functionality when the backend is a file
int fd = open_read("GNUmakefile");
assert(fd != -1);
unsigned char iobuf[42];
buffer b = BUFFER_INIT(read, fd, iobuf+32, 10);
bs_init_iobuf(&bs, &b);
assert(bs_skip(&bs, 100) == 100);
assert(prs_readblob(&bs, iobuf, 10) == 10);
assert(pread(fd, iobuf+10, 10, 100) == 10);
assert(!memcmp(iobuf, iobuf+10, 10));
// test basic functionality when backend is non-seekable file
int pipes[2];
assert(pipe(pipes)==0);
int r=fork();
assert(r!=-1);
if (r==0) {
lseek(fd, 0, SEEK_SET);
for (;;) {
r=read(fd, iobuf, 32);
if (r <= 0) return 0;
write(pipes[1], iobuf, 32);
}
}
buffer_init(&b, (ssize_t (*)())read, pipes[0], iobuf+32, 10);
bs_init_iobuf(&bs, &b);
assert(bs_skip(&bs, 20) == 20);
assert(prs_readblob(&bs, iobuf, 10) == 10);
assert(pread(fd, iobuf+10, 10, 20) == 10);
assert(!memcmp(iobuf, iobuf+10, 10));
kill(r, 15);
close(fd);
}
#endif
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