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view tests/mpp/misc.c @ 11:3aa0f5a02342
Remove unused variable; fix what it was supposed to be doing.
(and document it a bit for the next time through here)
author | David A. Holland |
---|---|
date | Tue, 31 May 2022 00:54:12 -0400 |
parents | 13d2b8934445 |
children |
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//////////////////////////////////////////////////////////// ... line splicing he\ llo /\ / comment //\ comment #define SPLIT splat SPL\ IT int c = '\0\ 12'; const char *x = "blah \0\ 12"; //////////////////////////////////////////////////////////// ... digraphs #define DI_STR(x) %:x #define DI_CAT(x,y) x %:%: y DI_STR(hi) DI_CAT(fu,bar) DI_STR(<:) DI_STR(:>) DI_STR(<%) DI_STR(%>) DI_STR(%:) #define HASH %: #define HASHHASH %:%: HASH HASHHASH %:define FOO 123 #ifdef FOO right #else wrong #endif %:undef FOO #ifdef FOO wrong #else right #endif //////////////////////////////////////////////////////////// ... comments a /**// b; a = b//*q*/ blah - c; #define CAT(x,y) x ## y #define CAT2(x,y) CAT(x,y) CAT(/,*) not comment CAT(*,/) CAT(/,/) not comment <a/*comment*/b> /* comment /* comment */ not comment #define CM stuff // comment CM staff (should be stuff staff on one line) #define CMM stuff /* comment */ CMM staff (should be stuff staff on one line) //////////////////////////////////////////////////////////// ... conditionals #if 0 wrong #elif 1 right #else wrong #endif #if NOTDEF wrong #else right #endif #if NOTDEF wrong #elif NOTDEF wrong #elif NOTDEF2 wrong #elif 1 right #endif #if 0 #if 1 wrong #else wrong #endif #if 0 wrong #else wrong #endif #elif 1 right #if 1 right #else wrong #endif #if 0 wrong #else right #endif #elif 1 wrong #else wrong #endif #if /*blah*/ 1 /*boo*/ right #else /* bar */ wrong #endif /* baz */ #ifdef NOTDEF wrong #else right #endif #ifndef NOTDEF right #else wrong #endif #define TWO 2 #if TWO > 1 right #else wrong #endif #if defined(TWO) right #else wrong #endif #if defined TWO right #else wrong #endif #if defined(THREE) wrong #else right #endif #if defined THREE wrong #else right #endif #if defined(defined) wrong #else right #endif defined(TWO) should have a 2 in it defined(THREE) should not be changed #define SUCC(x) x+1 #if SUCC(1) == 2 right #else wrong #endif #if TWO == 2 right #else wrong #endif #if TWO + NOTDEF == 2 right #else wrong #endif #if SUCC(TWO + NOTDEF * 12574) == 3 right #else wrong #endif #if SUCC(TWO + '0') == '3' right #else wrong #endif #if 'A' right #else wrong #endif #if '\0' wrong #else right #endif #if '\007' == 7 right #else wrong #endif #if defined TWO + 3 == 4 right #else wrong #endif #if defined NOTDEF * 5 wrong #else right #endif #undef TWO #if defined(TWO) wrong #else right #endif #if 1 #elif NOTDEF(1) #endif #if 0 #if NOTDEF(1) #endif #endif //////////////////////////////////////////////////////////// ... definitions #define AA aa #define BB() bb #define CC(x) x cc /* put these back in when/if varargs macros are supported */ /*#define DD(...) dd*/ /*#define EE(x, ...) x ee*/ AA /*BB*/ /*CC*/ DD EE AA() BB() /*CC()*/ DD() DD(,) EE(,) DD(,,) EE(,,) #undef AA #undef BB #undef CC #undef DD #undef EE /* #define FF(x, ...) __VA_ARGS__ x FF(ff, ) FF(ff, a) FF(ff, a, b) FF(ff, a, b, c) FF(ff, a, b, c, d) */ #undef FF #define define fedine #define undef dunef #define ifndef difnef #define GG gg GG should be gg #ifdef GG right #else wrong #endif define should be fedine undef should be dunef ifndef should be difnef #ifdef define right #else wrong #endif #ifdef undef right #else wrong #endif #ifdef ifndef right #else wrong #endif #ifndef ifndef wrong #else right #endif #undef define #undef undef #undef ifndef #ifdef define wrong #else right #endif #ifdef undef wrong #else right #endif #ifdef ifndef wrong #else right #endif #define HH(a,b,c) a b c HH((1,2),(3,4),(5,6)) /* HH(1, 2, 3 ) HH(4, 5, 6) */ #undef HH #define SUM(a,b) a + b #define CALL(x) x(1,2) CALL(SUM) should be 1+2 #if CALL(SUM) == 3 right #else wrong #endif #define ADD SUM ADD(1,ADD(2,3)) should be 1+2+3 /* #define RECURSE RECURSE RECURSE */ /* #define CROSSRECURSE1(x) x CROSSRECURSE2(1) #define CROSSRECURSE2(x) x CROSSRECURSE1(2) CROSSRECURSE1(0) CROSSRECURSE2(0) */ #define TWO two #define ADDTWO(x) TWO + x #undef TWO ADDTWO(1) should be two + 1 ... legal redefinitions #define ZERO (1-1) #define ZERO /* foo */ (1-1) /* bar */ #define IDENTITY(x) ( x ) #define IDENTITY(x) ( /* foo */ x ) //////////////////////////////////////////////////////////// ... stringize #define STR(x) #x #define STR2(x) STR(x) #define STRY(x, y) #y /* these should be using STRY not STR, but that doesn't work */ #if 0 STRY(, a b c) should be "a b c" STRY(, a b c) should be "a b c" STRY(, "stry\n") should be "\"stry\\n\"" STRY(, ) should be "" STRY(,) should be "" STRY(, /*woodle*/ b) should be "b" STRY(, a/*noodle*/b) should be "a b" STRY(, a /*boodle*/ b) should be "a b" #endif STR( a b c) should be "a b c" STR( a b c) should be "a b c" STR( "stry\n") should be "\"stry\\n\"" /* STR( ) should be "" STR() should be "" */ STR( /*woodle*/ b) should be "b" STR( a/*noodle*/b) should be "a b" STR( a /*boodle*/ b) should be "a b" #define GRACKLE(x) STR(x(1,2)) GRACKLE(SUM) should give "SUM(1,2)", not "1+2" STR2(SUM)(3,4) should give "SUM"(3,4), not "3+4" #if 0 /* broken */ STR(/*comment*/) should be "" #endif //////////////////////////////////////////////////////////// ... concat #define HASHES # ## # #define YY(x,y) STR(x H y) #define ZZ(x,y) STR2(x H y) YY(1,2) should be "1 H 2" ZZ(1,2) should be "1 ## 2" ... pasting of punctuation is not allowed CAT(+,+) CAT(-,-) CAT(<<,=) CAT(>>,=) CAT(<,<=) CAT(>,>=) CAT(<,>=) CAT(<,CAT(<,=)) CAT(>,CAT(>,=)) CAT2(+,+) CAT2(-,-) CAT2(<<,=) CAT2(>>,=) CAT2(<,<=) CAT2(>,>=) CAT2(<,>=) CAT2(<,CAT2(<,=)) CAT2(>,CAT2(>,=)) #define ONEHUNDRED 100 CAT(ONE, HUNDRED) should be 100 #define BASTET "bast" #define ET ET "et" CAT(BAST,ET) ---> "bast" /* CAT2(BAST,ET) ---> "bast" "et" */ #undef BASTET #undef ET #define KLUDGE KLU CAT2(KLUDGE, DGE) should be "KLU" #undef KLUDGE #define KLUDGE HACK KLUDGE /* CAT2(KLUDGE, ) should be "HACK KLUDGE" not "HACK HACK KLUDGE" */ #define CATE(x) x ## // comment CATE(10) #if 0 #define ECAT(x) /* comment */ ## x ECAT(20) #endif /* #define CATVA(x, ...) x ## __VA_ARGS__ CATVA(z,y,z) should be zy,x */ CAT(IDENTITY,IDENTITY(z)) should be IDENTITYIDENTITY(z) CAT2(IDENTITY,IDENTITY(z)) should be IDENTITYz CAT(1, /*comment*/ 2) should be 12 //////////////////////////////////////////////////////////// ... directive recognition #define EMPTY /* EMPTY #error wrong EMPTY #define SHOULDNT bad #ifdef SHOULDNT wrong #else wrong #endif */ # define SHOULD1 good #ifdef SHOULD1 right #else wrong #endif #define SHOULD2 good #ifdef SHOULD2 right #else wrong #endif # define SHOULD3 good #ifdef SHOULD3 right #else wrong #endif /*comment*/ #define SHOULD4 good #ifdef SHOULD4 right #else wrong #endif /* #define DEFINE #define FOO foo DEFINE #ifdef FOO wrong #else right #endif */ /* #define INCLUDE #include "nosuchfile.h" INCLUDE */ /* #define ERROR #error wrong ERROR */ //////////////////////////////////////////////////////////// ... keywords #define register 1 #define int + #define e 3 #if register int e == 4 right #else wrong #endif #undef register #undef int #undef e //////////////////////////////////////////////////////////// ... builtin macros __STDC__ should be 1 __STDC_VERSION__ should be a date