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