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#include "parse.h"
// This function asserts that the caller wants to read n bytes from the stream.
// If there is less space available, set the stream to error state.
int bs_capacityassert(struct bytestream* bs,size_t capacity) {
if (bs->cur>=bs->max || // if EOF or error, return 0
bs->max - bs->cur < capacity) { // not EOF but less than that many bytes left
bs->cur = 1; // set stream to error state
bs->max = 0;
return 0; // return failure
}
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_capacityassert(&bs, 100) == 1);
assert(bs_err(&bs) == 0);
bs.cur=50; bs.max=100;
assert(bs_capacityassert(&bs, 50) == 1);
assert(bs_err(&bs) == 0);
assert(bs_capacityassert(&bs, 51) == 0);
assert(bs_err(&bs));
// try to provoke a numeric overflow
bs.cur=100; bs.max=(size_t)-1;
assert(bs_capacityassert(&bs, (size_t)-50) == 0);
assert(bs_err(&bs));
}
#endif