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#include "parse.h"
// This function is supposed to tell the caller if there is more data to
// read. However, we have several limits we could run into. We have our
// own limit, which we check first, but then, if the bytestream is bound
// to an I/O stream we should also try to find out if the I/O stream has
// hit EOF.
int bs_capacitycheck(struct bytestream* bs,size_t capacity) {
if (bs->cur>=bs->max) return 0; // if EOF or error, return 0
if (bs->max - bs->cur < capacity) return 0; // not EOF but less than that many bytes left
return 1;
}
#ifdef UNITTEST
#include <assert.h>
#undef UNITTEST
#include "buffer/bs_err.c"
int main() {
struct bytestream bs;
// test basic functionality
bs.cur=0; bs.max=100;
assert(bs_capacitycheck(&bs, 100) == 1);
assert(bs_err(&bs) == 0);
bs.cur=50; bs.max=100;
assert(bs_capacitycheck(&bs, 50) == 1);
assert(bs_err(&bs) == 0);
assert(bs_capacitycheck(&bs, 51) == 0);
assert(bs_err(&bs) == 0); // capacitycheck should not set error. capacityassert should
// try to provoke a numeric overflow
bs.cur=100; bs.max=(size_t)-1;
assert(bs_capacitycheck(&bs, (size_t)-50) == 0);
assert(bs_err(&bs) == 0); // should still not set an error
}
#endif