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.if !\\$1 \&\\$1 \\$2 \\$3 \\$4 \\$5 \\$6
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.}S 5 1 \& "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6"
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.}S 1 5 \& "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6"
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.de EX \" start example
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expr \- c-like expression library
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Expr_t* exopen(Exdisc_t*);
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Excc_t* exccopen(Expr_t*, Exccdisc_t*);
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int excc(Excc_t*, const char*, Exid_t*, int);
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int exccclose(Excc_t*);
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void exclose(Expr_t*, int);
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char* excontext(Expr_t*, char*, int);
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void exerror(const char*, ...);
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Extype_t exeval(Expr_t*, Exnode_t*, void*);
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Exnode_t* exexpr(Expr_t*, const char*, Exid_t*, int);
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Exnode_t* excast(Expr_t*, Exnode_t*, int, Exnode_t*, int);
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Exnode_t* exnewnode(Expr_t*, int, int, int, Exnode_t*, Exnode_t*);
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void exfreenode(Expr_t*, Exnode_t*);
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int expush(Expr_t*, const char*, int, const char*, Sfio_t*);
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int excomp(Expr_t*, const char*, int, const char*, Sfio_t*);
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int exrewind(Expr_t*);
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void exstatement(Expr_t*);
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exopen() is the first function called.
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exclose() is the last function called.
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exccopen() is the called if code generation will be used.
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exccclose() releases the state information allocated in exccopen().
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exstatement() saves statement start information.
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exrewind() restores statement start information saved by exstatement().