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44 lines
1.8 KiB
C
44 lines
1.8 KiB
C
/* Defines Verify and VerifyX, which verify the truth of the given
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expression. Unlike assert, they guarantee that the expression be evaluated
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exactly once. Thus, you might say:
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Verify(fp=fopen(name, "w"))
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Verify((nwrit=fwrite(p, sz,ni, fp)) >= 0);
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VerifyX((nwrit=fwrite(p, sz, ni, fp)) >= 0, Shout("errno=%d, nwrit=%d\n",
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errno, nwrit));
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Verify0(stat(path, , &buf));
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Notice that VerifyX allows you to add "Xtra" information in the event of
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a failure.
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*/
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#undef Verify
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#undef VerifyX
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/* Is there ever really a good reason to shut this off?? */
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/* You can with -DNVERIFY. */
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# ifndef NVERIFY
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#include "error.h"
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#ifndef NO_STRINGIFICATION
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/* One can write a really slick version that uses GNU varargs macros, but */
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/* unfortunately, it would break every other pre-processor. It isn't even */
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/* possible to #ifdef __GNUC__ it because the pre-processor complains */
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/* about an incorrect arg count. It might be possible to write it as a */
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/* varargs function, but what's the point? */
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#define VerifyX( expr, xtra) \
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(expr) ? (void)0 : (xtra, Error("%s failed\n" , #expr))
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#define VerifySX( expr, xtra) \
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(expr) ? (void)0 : (xtra, SinglError("%s failed\n" , #expr))
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#else
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/* Not only do we not have Stringification, but we assume that we have */
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/* the brain-damaged macro substitution into string constants. */
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#define VerifyX( expr, xtra) \
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(expr) ? (void)0 : (xtra, Error("%s failed\n" , "expr"))
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#define VerifySX( expr, xtra) \
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(expr) ? (void)0 : (xtra, SinglError("%s failed\n" , "expr"))
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#endif /* NO_STRINGIFICATION */
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# else
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# define VerifyX( expr, xtra) ((expr),(void)0)
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# endif
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#define Verify( expr ) VerifyX(expr, (void)0)
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#define VerifyS( expr ) VerifySX(expr, (void)0)
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#define Verify0( expr ) Verify(!(expr))
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#define VerifyS0( expr ) VerifyS(!(expr))
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