You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
#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, 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
|