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